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europe (emea) tel: +44 (0)1582 723633 fax: +44 (0)1582 422283 americas tel: +1 281 571 8065 fax: +1 281 571 8069 asia pacific tel: +65 6 487 7887 fax: +65 6 487 7997 e-mail: enquiry@mtl-inst.com web site: www.mtl-inst.com aug 2009 din rail mounting safety barriers mtl7700 series since its introduction in 1984 the mtl700 series barrier has established itself as the worldwide standard for safety barriers. known for its quality and reliability, the mtl700 series is widely used in applications all over the world. the mtl7700 series follows closely in the footsteps of the mtl700, but as a din rail mounting barrier, providing quick and easy installation without the need for special hardware. removable terminals are used for ease of installation, maintenance and for providing a loop disconnect by simply unplugging the terminals from the side of the module. wire entry is also angled to assist wiring within limited space enclosures. mtl7700 barriers clamp simply and securely onto standard t-section din rail, simultaneously making a reliable is earth connection. for applications where field power is required for switch inputs or 2-wire transmitters, the mtl7700 series provides a bussed power feed facility. when used in conjunction with the mtl7798 power feed module the user has a fully protected, electronically fused supply to many barriers with no additional wiring required. mtl7700 active modules are protected with an electronic fuse for the majority of applications. the mtl7798 active fused, power feed module can protect up to 40 other modules using the bussed power facility and provides a clear indication of a trip condition via a red led. the mtl774x range of barriers offer a namur compatible input and a choice of relay or solid state output. the solid state outputs are floating so switching to ground or from a power rail into an input is also possible. the solid state interface also provides a high frequency transfer for use in flow or rotation applications. dual channel relay or solid state modules offer the highest packing density with only 6.3mm per channel and when used in conjunction with the power bus, offer users the minimum of wiring with the maximum packing density and the lowest cost per channel. proximity detector inputs electronic fusing direct replacement for mtl700 series barriers compatible terminal numbering and safety descriptions removable terminals bussed power feed to other modules relay and solid state switch modules dual channel variants 6.3mm per channel www..net
europe (emea) tel: +44 (0)1582 723633 fax: +44 (0)1582 422283 americas tel: +1 281 571 8065 fax: +1 281 571 8069 asia pacific tel: +65 6 487 7887 fax: +65 6 487 7997 e-mail: enquiry@mtl-inst.com web site: www.mtl-inst.com aug 2009 model no. safety description 1 polarities 2 available application basic circuit max. end- 3 to-end resistance vwkg at 4 10m a or (1ma) 5 vmax 6 fuse rating mtl v w ma + C ac hazardous safe w v v ma 7706+ 28 300 93 transmitters switches transmitters, switches, controller outputs iib see 'how they work' and 'active / electronically protected barriers' see additional specification 35 50 7707+ 28 300 93 35 50 28 diode 35 50 7707p+ 28 164 171 35 50 28 diode C 35 50 7710+ 10 50 200 6v dc & 4v ac systems 12v systems 12v dc systems 18v dc systems controller outputs, solenoids transmitters controller outputs, solenoid valves controller outputs, solenoid valves iib 75 6.0 7.0 50 7715+ 15 100 150 119 12.0 13.1 100 7715p+ 15 50 291 64 12.6 13.7 100 7722+ 22 150 147 174 19.6 20.2 50 7728+ 28 300 93 333 25.9 26.5 50 7728- 28 300 93 333 25.9 26.5 50 7728ac 28 300 93 333 25.0 25.9 50 7728p+ 28 234 119 252 24.9 25.9 100 7729p+ 28 164 170 184 24.9 25.9 100 774x 10 19 prox sw input, solid state output and line fault detect see 'active / electronically protected barriers' 30/35 50 7755ac 3 10 300 2 or 3- wire rtds (floating bridge) 19.0 (1) 3.4 250 3 10 300 19.0 (1) 3.4 250 7756ac 3 10 300 3 - wire rtds (grounded bridge) 19.0 (0.7) 2.7 250 3 10 300 19.0 (0.7) 2.7 250 3 10 300 19.0 (0.7) 2.7 250 7758+/- 7.5 10 750 gas detectors 17 6.0 7.3 200 7.5 10 750 17 6.0 7.3 200 7761ac 9 90 100 107 6.0 7.0 100 9 90 100 107 6.0 7.0 100 7761pac 9 350 26 strain-gauge bridges 378 6.8 7.5 50 9 350 26 378 6.8 7.5 50 7764+/ac 12 1k 12 strain-gauge bridges 1050 10.0 10.9 50 12 1k 12 1050 10.0 10.9 50 7766ac 12 150 80 174 10.0 10.6 50 12 150 80 174 10.0 10.6 50 7766pac 12 75 157 strain-gauge bridges 92 9.6 10.5 100 12 75 157 strain-gauge bridges 92 9.6 10.5 100 7767+ 15 100 150 12v dc systems 119 12.0 13.1 100 15 100 150 12v dc systems 119 12.0 13.1 100 7779+ 28 300 93 controller outputs requires channels 333 25.9 26.5 50 28 300 93 controller outputs separate in iic 333 25.9 26.5 50 7796+ 26 300 87 vibration probes 333 23.9 24.5 50 20 390 51 428 18.3 18.9 50 7796- 26 300 87 vibration probes 333 23.9 24.5 50 20 390 51 428 18.3 18.9 50 7760ac 10 50 200 active dc & ac sensors thermocouples 75 6.0 6.7 50 10 50 200 75 6.0 6.7 50 7765ac 15 100 150 124 12.0 12.5 50 15 100 150 124 12.0 12.5 50 7778ac 28 600 47 651 24.0 25.4 50 28 600 47 651 24.0 25.4 50 7789+ 28 300 93 a switch inputs / signal returns 651 26.6 27.2 50 651 26.6 27.2 50 28 diode 0.9v+26w 26.6 27.2 50 28 diode 0.9v+26w 26.6 27.2 50 7787+/- 28 300 93 transmitters controller outputs, switches 333 26.6 27.2 50 28 diode 0.9v+21w 26.6 27.2 50 7787p+ 28 234 119 253 26.4 27.2 80 28 diode 0.9v+21w 26.4 27.2 80 7788+ 28 300 93 transmitters 333 25.9 26.5 50 10 50 200 75 6.0 7.0 50 7788r+ 28 300 93 333 25.9 26.5 50 10 50 200 75 6.0 7.0 50 specifications key barriers shown in blue for notes 1 to 7 see 'terminology' (later in this section) a terminals 3 & 7 connected together * diagrams show positive versions. all diodes reversed on negative versions. additional diodes fitted on ac versions. { www..net
europe (emea) tel: +44 (0)1582 723633 fax: +44 (0)1582 422283 americas tel: +1 281 571 8065 fax: +1 281 571 8069 asia pacific tel: +65 6 487 7887 fax: +65 6 487 7997 e-mail: enquiry@mtl-inst.com web site: www.mtl-inst.com aug 2009 general specification ambient temperature and humidity limits C20 to +60c continuous working C40 to +80c storage 5C95% rh leakage current for basic barriers with a working voltage of 5v or more, the leakage current decreases by at least one decade per volt reduction in applied voltage below the working voltage, over two decades. for the mtl7755ac/7756ac it decreases by at least one decade for a 0.4v reduction in applied voltage. terminations removable terminals accommodate conductors up to 2.5mm 2 (13awg). hazardous-area terminals are identified by blue labels. removal force >15n colour coding of barrier label grey: non-polarised red: positive polarity (MTL7706 negative to transmitter ) black: negative polarity white: dummy barrier, mtl7799 weight 140g approx mounting and earthing by 35mm top hat din rail dimensions (mm) mtl7700 series key barriers summarised how they work all mtl7700 series barriers are based on the same simple principle. each channel contains two stages of pulse-tested zener or forward- connected diodes and an infallible terminating resistor. in the event of an electrical fault in the safe area, the diodes limit the voltage that can reach the hazardous area and the resistor limits the current. a fuse protects the diodes, and the two stages of voltage limitation ensure continued safety if either stage should fail. no active output- current limiting circuits are employed. all models are certified ia for all zones and iic for all explosive atmospheres (except mtl7707p+ and mtl7729p+, 'ia' 'iib'). terminology 1. safety description the safety description of a barrier, eg 10v 50 w 200ma, refers to the maximum voltage of the terminating zener or forward diode while the fuse is blowing, the minimum value of the terminating resistor, and the corresponding maximum short-circuit current. it is an indication of the fault energy that can be developed in the hazardous area, and not of the working voltage or end-to-end resistance. 2. polarity barriers may be polarised + or C, or non-polarised (ac). polarised barriers accept and/or deliver safe-area voltages of the specified polarity only. non-polarised barriers support voltages of either polarity applied at either end. 3. end-to-end resistance the resistance between the two ends of a barrier channel at 20c, ie of the resistors and the fuse. if diodes or transistors are present, their voltage drop (transistors on) is quoted in addition. 4. working voltage (vwkg) the greatest steady voltage, of appropriate polarity, that can be applied between the safe-area terminal of a basic barrier channel and earth at 20c for the specified leakage current, with the hazardous-area terminal open circuit. 5. maximum voltage (vmax) the greatest steady voltage, of appropriate polarity, that can be applied continuously between the safe-area terminal of any barrier channel and earth at 20c without blowing the fuse. for basic barriers, it is specified with the hazardous-area terminal open circuit; if current is drawn in the hazardous area, the maximum voltage for these barriers is reduced. the ac channels of basic barriers and most channels of overvolt-protected barriers withstand voltages of the opposite polarity also C see circuit diagrams. 6. fuse rating the greatest current that can be passed continuously (for 1000 hours at 35c) through the fuse. 7. star connection in star-connected barriers, the two channels are interlocked such that the voltage between them cannot exceed the working voltage, vwkg: this allows for higher cable capacitance or inductance. 8. maximum safe-area voltage (u m ) the maximum permissible safe-area voltage (u m ) for mtl7700 series barriers is 250v ac/dc.
? ? ?? ? ? ?- ? ?? ? - ?? ? ? type application key barrier analogue input (low-level) resistance temperature detectors thermocouples, ac sensors 7756ac 7760ac analogue input (high- level) transmitters, 2-wire, 4/20ma 7706+ 7787+ analogue output controller outputs, one line earthed controller outputs, neither line earthed 7728+ 7787+ digital (on/off) input switches 7787+ 7741/3 digital (on/off) output solenoids, alarms, leds 7728 www..net
europe (emea) tel: +44 (0)1582 723633 fax: +44 (0)1582 422283 americas tel: +1 281 571 8065 fax: +1 281 571 8069 asia pacific tel: +65 6 487 7887 fax: +65 6 487 7997 e-mail: enquiry@mtl-inst.com web site: www.mtl-inst.com aug 2009 active / electronically protected barriers active / electronically protected barriers the following barriers have built-in overvolt protection, allowing their use with unregulated power supplies. in many applications, eg, sensor inputs or controller outputs, there is insufficient power available to blow the barrier fuse and this additional protection is not necessary. however, where the barrier is connected to a power supply, eg, for energising transmitters, switches, solenoids or local alarms, overvolt protection allows the barriers to be used with unregulated supplies and also gives protection against faulty wiring during commissioning. MTL7706+ for 'smart' 2-wire 4/20ma transmitters the MTL7706+ is a 1-channel shunt-diode safety barrier, with built- in electronic overvolt protection, for energising a 2-wire, 4/20ma transmitter in a hazardous area. it is powered from a positive supply of 20C35v dc and delivers a 4/20ma signal into an earthed load in the safe area. it is proof against short circuits in the field and in the safe area and is extremely accurate. the MTL7706+ will pass incoming communication signals up to 10khz from a smart transmitter, while in the outgoing direction it will pass signals of any frequency likely to be encountered. since the MTL7706+ has no return channel for energising the load, the entire output of the single 28v channel is available to power the transmitter, providing high output capability. this channel is negatively polarised, and the safe-area signal is in fact the very current that returns through it from the hazardous area, the novel circuit being energised by a built-in floating dc supply derived from the external dc source of power. to prevent any leakage through the zener diodes and maximise the output voltage available at 20ma, the floating supply is given a rising voltage/current characteristic. a separate circuit limits the current to protect the fuse in the event of a short circuit in the hazardous area. with a 20v supply, the barrier will deliver 16.2v minimum at 20ma for the transmitter and lines and consumes typically 45ma at 24v operation. basic circuit additional specification safety description 28v 300 w 93ma supply voltage 20 to 35v dc w.r.t earth output current 4 to 20 ma voltage available to transmitter and lines 16.2v @ 20ma with 250 w load (negative w.r.t. earth) 11.0v @ 20ma with 500 w load (negative w.r.t. earth) accuracy 2a under all conditions safe-area load resistance 0 to 500 w supply current 45ma typical at 20ma and 24v supply 60ma maximum at 20ma and 20v supply mtl7707+ for switch inputs and switched outputs the mtl7707+ is a 2-channel shunt-diode safety barrier similar to the mtl7787+ but with built-in electronic overvolt protection. it is intended primarily for safeguarding a hazardous-area switch controlling a relay, opto-coupler or other safe-area load from an unregulated dc supply in the safe area. the outgoing channel accepts supply voltages up to +35v and is protected against reverse voltages: the return channel is unaffected by voltages up to +250v. in normal operation the protection circuit introduces only a small voltage drop and shunts less than 1ma to earth, so its overall effect is minimal. if the supply voltage exceeds about 27v, however, causing the zener diodes to conduct C or if the safe-area load has a very low resistance C the supply current is limited automatically to 50ma, protecting the fuse and power supply and enabling the loop to continue working. basic circuit additional specification safety description 28v 300 w 93ma, terminals 1 to 3 28v diode, terminals 2 -4 supply voltage 10 to 35v dc with respect to earth output current up to 35ma available maximum voltage drop (at 20oc, current not limited) iout x 345 w + 0.3v, terminals 1 to 3 iout x 25 w + 0.9v, terminals 4 to 2 supply current iout + 1.6ma, supply <26v limited to 50ma, supply >28v or low load resistance mtl7707p+ for switch inputs and switched outputs, 2w transmitters (iib gases) the mtl7707p+ is a two-channel shunt-diode safety barrier similar to the mtl7787p+, but is designed for use with group iib gases and features built-in electronic overvolt protection allowing use with unregulated power supplies up to 35v dc. it is intended primarily as a low cost solution for driving iib certified 2-wire 4/20ma transmitters, but can also be used with controller outputs with current monitoring, solenoid valves and switches. to protect the fuse and enable the loop to continue working, the supply current is limited automatically at 50ma should the output be short-circuited or excess voltage applied.
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europe (emea) tel: +44 (0)1582 723633 fax: +44 (0)1582 422283 americas tel: +1 281 571 8065 fax: +1 281 571 8069 asia pacific tel: +65 6 487 7887 fax: +65 6 487 7997 e-mail: enquiry@mtl-inst.com web site: www.mtl-inst.com aug 2009 mtl7742 proximity sensor or switch input with solid state output the mtl7742 is a single channel switch/prox input barrier with an open collector solid state interface to the safe area equipment. the solid state switch is especially useful for high frequency switching apparatus including pulse and rotational sensors. the power bus terminal can be used to connect power to the module and the input power supply range makes the module suitable for use with unregulated supplies. basic circuit additional specification safety description 10v 19ma supply voltage 20 to 35v dc with respect to earth input characteristics output energised if input >2.1ma(<2k w) output de-energised if input <1.2ma(>10k w) output characteristics operating frequency dc to 2.5khz max off-state voltage 35v max off-state leakage 10a max on-state voltage drop <1.41v @ 50ma <1.22v @ 2ma typically <1v max on-state current 50ma supply current 20ma maximum @ 24v mtl7743 2 channel proximity sensor or switch input and relay outputs the mtl7743 is a dual channel switch/prox sensor input barrier with a relay interface. this module is ideal for applications where high channel packing densities are required for digital inputs. power is connected using the power bus terminal. basic circuit additional specification safety description 10v 19ma supply voltage 22.9 to 30v dc with respect to earth input characteristics relay energised if input >2.1ma(<2k w) relay de-energised if input <1.2ma(>10k w) relay contacts 50v ac 0.5a. resistive 30v dc, 1a. resistive supply current 45ma maximum @ 24v response time <10ms basic circuit additional specification safety description 28v 164 w 171ma, terminals 1 to 3 28v diode, terminals 4 to 2 supply voltage 10 to 35v dc with respect to earth output current up to 35ma available maximum voltage drop (at 20oc, current not limited) iout x 218 w + 0.3v, terminals 1 to 3 iout x 20.1 w + 0.9v, terminals 4 to 2 supply current iout + 1.6ma, supply <26v limited to 50ma, supply >28v or low load resistance mtl7741 proximity sensor or switch input and relay output the mtl7741 is a single channel switch/prox input barrier with changeover relay contacts acting as the safe area interface. relay contacts provide a universal interface capable of switching a wide range of signals including ac, low level and high level voltages. phase reversal is achieved by connecting the normally open or normally closed contacts as required. the power bus terminal may be used to connect the module to a power source. basic circuit additional specification safety description 10v 19ma supply voltage 22.9 to 30v dc with respect to earth input characteristics relay energised if input >2.1ma(<2k w) relay de-energised if input <1.2ma(>10k w) relay contacts 50v ac 0.5a. resistive 30v dc, 1a. resistive supply current 26ma maximum @ 24v response time <10ms

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hazardous area safe area hazardous area safe area www..net
europe (emea) tel: +44 (0)1582 723633 fax: +44 (0)1582 422283 americas tel: +1 281 571 8065 fax: +1 281 571 8069 asia pacific tel: +65 6 487 7887 fax: +65 6 487 7997 e-mail: enquiry@mtl-inst.com web site: www.mtl-inst.com aug 2009 mtl7744 2 channel proximity sensor or switch inputs with solid state outputs a dual channel version of the mtl7742. this module provides two solid state interfaces for prox/switch inputs. power is connected via the power bus. basic circuit additional specification safety description 10v 19ma 10v 19ma supply voltage 20 to 35v dc with respect to earth input characteristics output energised if input >2.1ma(<2k w) output de-energised if input <1.2ma(>10k ) output characteristics operating frequency dc to 2.5khz max off-state voltage 35v max off-state leakage 10a max on-state voltage drop 1.41v @ 50ma 1.22v @ 2ma typically <1v max on-state current 50ma supply current 29ma maximum @ 24v mtl7745 proximity sensor or switch input with relay output and line fault detect the mtl7745 is a single channel switch/prox input barrier providing line fault detection. proximity detectors or switches fitted with end-of- line resistors may be connected. short circuit or open ciruit conditions in the field wiring will generate an alarm condition. the lfd relay contacts close when a fault is detected allowing the contacts to be connected in parallel to provide a common alarm. the power bus terminal can be used to connect power to this module. basic circuit additional specification safety description 10v 19ma supply voltage 22.9 to 30v dc with respect to earth input characteristics output energised if input >2.1ma(<2k w) output de-energised if input <1.2ma(>10k w) lfd relay + red led energised if input <50 m a or <100w relay contacts 50v ac 0.5a. resistive 30v dc, 1a. resistive supply current 38ma maximum @ 24v response time <10ms mtl7798 power feed and protection module the mtl7798 power feed module incorporates both voltage and current sense mechanisms to protect barrier circuits by activating a solid state trip mechanism when fault or overload conditions occur in the power source circuit. resetting the module after tripping is achieved by interupting the supply to the unit. a red led indicates a circuit trip condition and a green led the availability of power at the outputs. bussed power for other modules is sourced from the top of the unit using the bus power link bpl7700 or via terminals 1 and 2. basic circuit additional specification input voltage range (terminals 5&6) 20 to 26.8v maximum input voltage capability 45v power source requirements >1.8a trip mechanism minimum trip 26.8v @ 20c (+18mv/c) output current range 0 to 800ma maximum voltage drop 20mv @ 0ma, 1.0v @ 800ma load
hazardous area safe area
hazardous area safe area

hazardous area safe area www..net
europe (emea) tel: +44 (0)1582 723633 fax: +44 (0)1582 422283 americas tel: +1 281 571 8065 fax: +1 281 571 8069 asia pacific tel: +65 6 487 7887 fax: +65 6 487 7997 e-mail: enquiry@mtl-inst.com web site: www.mtl-inst.com aug 2009 mtl7700 series barriers protect devices located in all normally occurring explosive atmospheres, including air/flammable gas mixtures, dusts and fibres. applications covered include the protection of installations incorporating uncertified devices (simple apparatus) such as thermocouples, switches and resistive sensors, or separately certified energy storing (or voltage producing) apparatus including ac sensors, transmitters and current-to-pneumatic (i/p) converters. recommended choices for specific applications are discussed briefly in the following pages. mtl7700 series barrier applications analogue inputs (high level) 2-wire transmitters, 4/20ma, conventional and smart the recommended barrier for use with 'conventional' and 'smart' 4/20ma transmitters (fed by a 26v regulated supply) is the mtl7787+. this provides up to 12.9v (14.6v for mtl7787p+) at vwkg and 20ma for a transmitter and its lines as well as 5v for the typical 250 w load. this application and this barrier is suitable for use with the optional power bus facility. the MTL7706+ is recommended for applications where an unregulated supply of up to 35v is used. it provides 16.0v for conventional and smart transmitters at 20ma, as well as 5v for a typical 250 w load. with the MTL7706+ terminal 3 is negative with respect to earth, so the connections to terminals 3 and 4 should be reversed.
3 4 1 2 mtl7760ac earth free signal photocell microphone turbine flowmeter +6.0v 3 4 1 2 mtl7760ac v out 0v 3 4 1 2 mtl7788r+ 250 1-5v power +26v power bus 3 4 1 2 mtl7796- power -24v v out 0v probe driver transducer monitor
analogue inputs (low-level) thermocouples and mv sources the recommended barrier for thermocouples and mv sources is the mtl7760ac. this 2-channel non-polarised barrier retains the earth- free nature of the signal and, providing the receivers input floats, rejects common-mode ac and dc interference up to at least 7v and is unaffected by earth faults on the primary element. hazardous area safe area vibration probes the 3-wire transmitters used with vibration monitoring equipment are invariably supplied by a C24v dc power supply C hence the recommended barrier choice is the negatively-polarised mtl7796C. slidewire displacement transducers the simplest choice is the mtl7760ac. this barrier supplies power and brings back a unipolar signal. ac sensors, photocells, microphones and turbine flowmeters the mtl7760ac is the recommended choice for these devices. while many of these are designated simple apparatus and thus do not need certification, note that some ac sensors may be subject to a significant level of inductance and will therefore need to be designed and certified for hazardous-area locations. www..net
europe (emea) tel: +44 (0)1582 723633 fax: +44 (0)1582 422283 americas tel: +1 281 571 8065 fax: +1 281 571 8069 asia pacific tel: +65 6 487 7887 fax: +65 6 487 7997 e-mail: enquiry@mtl-inst.com web site: www.mtl-inst.com aug 2009 rtds for 3-wire rtds, a single mtl7755ac barrier is the most economical choice. this is suitable for use with a floating bridge C the two leads from the bridge arms are protected by the barrier with the third (supply) lead being earthed through the barrier. the barrier has a low end-to-end resistance of only 19 w /channel to minimise span changes and its channels track within 0.15 w (between C20c and +60c) to minimise zero shift with temperature. strain-gauge bridges s ingle strain-gauge bridges this shows an arrangement using two or three barriers, which is safe in iic gases. with the mtl7761ac, the circuit is powered from a 14v, 230 w source; if the bridge resistance is 230w , then the bridge voltage is 7v. if the bridge resistance is 350 w , then the bridge voltage is 8.4v. an mtl7764ac can be used to sense the bridge supply voltage. an mtl7761ac is used here for the mv output. an mtl7766pac provides 12.3v for a 350 w bridge with a 20v supply. mtl7761pac's can be used for the sense and pick-off circuits. hazardous area safe area 3 4 1 2 m tl7756ac receiver 7 5 3 4 1 2 m tl7755ac receiver 3 4 1 2 receiver 3 4 1 2 mtl7755ac mtl7761ac mtl7755ac mtl7761ac 4-wire constant-current circuits do not need matched barrier resistances and can be protected by two mtl7761ac barriers. if the increase in loop resistance is too great, use two mtl7755ac barriers instead. if the bridge circuit is already earthed, the third barrier channel provided by an mtl7756ac is needed. for extreme accuracy, 3 channels and an earth-free bridge can be used, a configuration that cancels out the small errors due to barrier leakage. channels 1 and 2 (those between terminals 1 & 2 and 3 & 4 respectively) track to within 0.15 w (between C20c and 60c). 3 4 1 2 +7v 3 4 1 2 mtl7761ac mtl7764ac 3 4 1 2 mtl7761ac --7v 0v output (mv) sense + ? www..net
europe (emea) tel: +44 (0)1582 723633 fax: +44 (0)1582 422283 americas tel: +1 281 571 8065 fax: +1 281 571 8069 asia pacific tel: +65 6 487 7887 fax: +65 6 487 7997 e-mail: enquiry@mtl-inst.com web site: www.mtl-inst.com aug 2009 strain-gauge bridges (cont) double strain-gauge bridges quite frequently there is a demand to monitor two load cells, and a possible circuit, safe in iic, is shown. here, the lower voltage drop of the mtl7766pac is an advantage. the mtl7766pac supplies power to the bridge(s) while two mtl7761pac barriers interface with the sense and pick-off circuits. using 350 w bridge systems, the following voltages are available from an mtl7766pac with a 10v supply: 1 bridge: 13.11v 2 bridges: 9.75v analogue outputs controller outputs (i/p converters) the single-channel mtl7728+ with a voltage drop of 6.66v at 20ma is the recommended choice for most controller outputs. higher-power versions are available: the mtl7728p+ (5.1v drop) is suitable for iic applications; the mtl7729p+ (3.68v drop) for iib applications. hazardous area safe area 3 4 1 2 +10v 3 4 1 2 mtl7766pac mtl7761pac 3 4 1 2 mtl7761pac --10v 0v sense + ? output (mv) 3 4 1 2 mtl7728+ 3 4 1 2 mtl7787+ mtl7787p+ 3 4 1 2 mtl7787+ mtl7787p+ the mtl7787+ and mtl7787p+ are also suitable for controllers containing a resistor which enables the return current to be monitored for high-integrity operation. for controllers with an output circuit separated from the 0v rail by the control transistor, the 2-channel mtl7787+ is the preferred choice as the return channel can handle up to 26.6v allowing the control signal to be turned off completely. the voltage drop is 8.1v at 20ma. a higher-power version of the latter, the mtl7787p+, is also available. the return channel of these barriers handle up to 26.4v and the maximum voltage drop is only 6.38v. www..net
europe (emea) tel: +44 (0)1582 723633 fax: +44 (0)1582 422283 americas tel: +1 281 571 8065 fax: +1 281 571 8069 asia pacific tel: +65 6 487 7887 fax: +65 6 487 7997 e-mail: enquiry@mtl-inst.com web site: www.mtl-inst.com aug 2009 digital (on/off) inputs switches the normal choice is the mtl7787+/7787p+ with a regulated supply. the mtl774x modules are recommended for applications where an unregulated supply of up to 30v for relay output modules, or 35v for solid state output modules, is used. the mtl7789+ offers a dual channel passive barrier for switch inputs where the input current for each channel is <10ma. digital (on/off) outputs alarms, leds, solenoids valves, etc for these applications, the mtl7728+ is recommended. higher- powered versions are available: the mtl7728p+ is suitable for iic applications; the mtl7729p+ for iib applications. if the control switch is to earth, then the 2-channel mtl7787+ barrier should be used, or, alternatively, the mtl7787p+ higher-power version. if the supply is poorly regulated use the mtl7707+. the mtl7707+ is recommended for applications where an unregulated supply of up to 35v is used. hazardous area safe area 3 4 1 2 mtl7787+ mtl7787p+ power +26.6v signal power bus 3 4 1 2 mtl7789+ 7 8 5 6 power +26.6v power +26.6v logic signal logic signal power bus 3 4 1 2 mtl7743 mtl7744 7 8 5 6 3 4 1 2 m tl7745 5 6 62 0 10k +22.9 - 30v lfd com ch 1 power bus 3 4 1 2 mtl7742 5 6
3 4 1 2 mtl7741 5 6 7 8 +26v 3 4 1 2 0v mtl7707+ mtl7787+ mtl7787p+ switches / proximity detectors mtls range of new switch/prox input barriers provide the user with a choice of relay and solid state outputs in single and dual channel versions. the mtl7741 is single channel with a changeover relay output. the mtl7743 and mtl7744 are dual channel versions affording very high packing densities. power must be provided to these modules using the power bus facility. the mtl7745 is a single channel proximity input (or switch input if end of lines resistors are fitted) with relay contacts providing switch and line fault status. the lfd relay contacts close when a fault is detected. the mtl7742 has a single channel solid state switch that can be configured to switch from a power rail or down to ground. this is also ideal for high switching frequency applications. +24.9v 3 4 1 2 mtl7707+ mtl7728+ mtl7728p+ mtl7729p+ 0v www..net
europe (emea) tel: +44 (0)1582 723633 fax: +44 (0)1582 422283 americas tel: +1 281 571 8065 fax: +1 281 571 8069 asia pacific tel: +65 6 487 7887 fax: +65 6 487 7997 e-mail: enquiry@mtl-inst.com web site: www.mtl-inst.com aug 2009 spare cable cores and screens the mtl7799 dummy barrier is used primarily for securing and earthing unused cables and screen connections. hazardous area terminals 3 and 4 are internally connected to the din-rail mounting/ earth connection. it also provides a power bus connection for direct connection of power for modules such as the mtl7743 and mtl7744 where no power supply screw terminal is provided. positive dc systems low-level to 12v dc systems the two channels of the mtl7764+ and mtl7767+ can be combined safely in iic. the mtl7764+ can be used for low-level logic return signals whilst the mtl7767+ is used for 6v dc and 12v dc systems. 18v dc systems the single-channel mtl7722+ is recommended for 18v dc systems. ac and dc systems high-level ac and dc systems the versatile star-connected mtl7765ac and mtl7778ac allow vwkg to be developed from each channel to ground but only allow vwkg to be developed between channels. this provides some common-mode voltage capability and can allow higher cable parameters to be used. negative and floating power supplies digital (on/off) outputs the mtl7728C is used with a negative power supply and positive earth. typically used for digital inputs or outputs, as shown. the mtl7728-- can also be used with floating power supplies, for transmitters. hazardous area safe area 3 4 1 2 0v mtl7764+ mtl7767+ +10v/+12v +10v/+12v 3 4 1 2 0v mtl7722+ +19.6v 3 4 1 2 mtl7765ac mtl7778ac 12v/24v 0v +26v 3 4 1 2 mtl7728? 3 4 mtl7799 1 www..net
europe (emea) tel: +44 (0)1582 723633 fax: +44 (0)1582 422283 americas tel: +1 281 571 8065 fax: +1 281 571 8069 asia pacific tel: +65 6 487 7887 fax: +65 6 487 7997 e-mail: enquiry@mtl-inst.com web site: www.mtl-inst.com aug 2009 power bus applications the pb7700 power bus is invaluable for saving installation time and wiring when connecting a 24v dc power source to a number of barriers. typical applications include hazardous-area switches, 4/20ma transmitters and proximity detectors. the diagram illustrates the configuration for 4 barriers but up to 40 barriers can be served by this method. the mtl7798 power feed module would normally be used with standard barriers such as mtl7787+ and mtl7787p+ because the current/voltage trip protection mechanism of the mtl7798 protects the fuses in the barriers. the mtl7799 dummy barrier can be used instead of the mtl7798 for direct feed-through connection of a 24v dc supply onto the power bus. looping the power feed to each end of the bussed power allows the removal of individual barriers without loss of power to others in the chain. other units that can use the power bus facility: MTL7706 mtl7707+ mtl7707p+ mtl7741 mtl7742 mtl7743 mtl7744 mtl7745 mtl7787+ mtl7787p+ mtl7788+ mtl7788r+ mtl7789+ hazardous area safe area

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europe (emea) tel: +44 (0)1582 723633 fax: +44 (0)1582 422283 americas tel: +1 281 571 8065 fax: +1 281 571 8069 asia pacific tel: +65 6 487 7887 fax: +65 6 487 7997 e-mail: enquiry@mtl-inst.com web site: www.mtl-inst.com aug 2009 mtl7700 series accessories mounting/earthing accessories mtl7700 series barriers mount easily and quickly onto standard din rail which also acts as the intrinsically safe earth. thr2 standard din rail thr7000 plated rail specially nickel-plated t-section (35mm x 7.5mm) din rail for use in potentially corrosive atmospheres. supplied in 1meter lengths. isp7000 insulating spacers attached to the base of a din rail at either end or at intervals (depending upon din rail length) to isolate the is earth from a structural earth. erb57s earth-rail bracket, straight nickel-plated; supplied with two push fasteners, one 14mm earth-rail clamp and one 10mm earth clamp for cables 16mm 2 . etm7 earth terminal for terminating cable screens and 0v earth returns and securing spare cores to the earth rail. a maximum of two etm7s per barrier can be accommodated. tgl7700 erb57o ta g57 erl7 etm7 14mm ear th-rail c lamp thr2/thr7000 erb57s in lo wer position isp7000 etl7000 10mm ear th c lamp imb57 snap off e xtension when using imb57 as a central suppor t 27 7. 5 35 14. 6 62 50 20 m6 x 16 ?4 .4 m4 x 16 imb57 insulating mounting block one required at each end of a tagging strip/earth rail. suitable for low-profile (7.5mm) and high-profile (15mm) symmetrical din rai l. erb57o earth-rail bracket, offset nickel-plated; supplied with two push fasteners, one 14mm earth-rail clamp and one 10mm earth clamp for cables 16mm 2 . etl7000 earth terminal provides connection for routing the is earth from the din rail to an appropriate plant earth. maximum cable cross-section is 10mm 2 . two recommended per discrete length of din rail. see instruction manual inm7700 for more details. bpl7700 power bus link when a number of barriers use a common power supply, the optional power link (bpl7700) can be used. typical applications include hazardous area switches, solenoids and 4C20ma transmitters. the barriers it can be used with are the MTL7706, mtl7707+, mtl7787+, mtl7787p+, mtl7789p+ and mtl774x. see next page for further details. 82m m 135m m 28m m 66m m 15m m 150m m 10m m 3m m 9m m 14m m 5m m 133.5m m 10m m 3m m 10m m 57m m 14m m 10 43. 5 48 over di n r ai l www..net
europe (emea) tel: +44 (0)1582 723633 fax: +44 (0)1582 422283 americas tel: +1 281 571 8065 fax: +1 281 571 8069 asia pacific tel: +65 6 487 7887 fax: +65 6 487 7997 e-mail: enquiry@mtl-inst.com web site: www.mtl-inst.com aug 2009 mtl7700 barriers select by barrier number and polarity, e.g. mtl7728+ mounting accessories thr2 standard din-rail, 35 x 7.5mm thr7000 t-section din-rail, specially-plated, 35 x 7.5mm, 1m length isp7000 insulating spacer standard earthing/earth-rail accessories etl7000 earth terminal, din-rail mounted imb57 insulating mounting block erb57s earth-rail bracket, straight erb57o earth-rail bracket, offset erl7 earth rail, 1m length etm7 earth terminal, pack of 50 standard tagging accessories tag57 tagging strip, 1m length tgl7700 tagging strip labels, set of 10 x 0.5m bussed power links bpl7700 pack of 100 enclosures dx070 enclosure, for mtl7700 x 5 dx170 enclosure, for mtl7700 x 13 dx430 enclosure, for mtl7700 x 33 spares (all in packs of 10) saf7712 safe-area terminals 1 & 2 haz7734 hazardous area terminals 3 & 4 saf7756 safe-area terminals 5 & 6 haz7778 hazardous area terminals 7 & 8 th7700 tag holder literature inm7700 instruction manual, mtl7700 series ina7700 atex information, mtl7700 series inm57enc instruction manual, mtl5000/7000 series enclosures cd7700... customer drawings tagging accessories two methods of tagging are available which can be used separately or together: 1) individual barrier identification th7700 barrier identifiers th7700 barrier identifiers are supplied clipped on to the tops of individual barriers to provide transparent holders for identification labels. 2) tagging strip method tag57 tagging strip, 1m length cut to size. supplied with reversible tagging strip label suitable for either mtl5000 or mtl7000 series module spacing. tgl7700 tagging strip labels, set of 10 x 0.5m for use with tag57 tagging strip. tags are reversible - one side for mtl7700, the other for mtl700. how to order www..net
europe (emea) tel: +44 (0)1582 723633 fax: +44 (0)1582 422283 americas tel: +1 281 571 8065 fax: +1 281 571 8069 asia pacific tel: +65 6 487 7887 fax: +65 6 487 7997 e-mail: enquiry@mtl-inst.com web site: www.mtl-inst.com aug 2009 note : for fm compliance, the mtl7700 series barriers shall be installed in compliance with the enclosure, mounting, spacing and segregation requirements of the ultimate application. ? certified to cenelec iib/fm grps c-g only. approvals (for the latest certificate information see www.mtl-inst.com/support/certificates) region (authority) uk (baseefa) uk (baseefa) systems usa (fm) canada/usa (csa) japan (tiis) standard en 50014 en 50020 en 50039 3600, 3610 entity 3611, 3810 can/csa e60079 ul698, ul913, ul1604 iec60079, c22.2 see certificates approved for [eex ia] iic [eex ia] iib ? eex ia iic eex ia iib ? ais/i,ii,iii/1/entity abcdefg- sci-942; ni/i/2/abcd/t4 [i/0] aex[ia]iic C sci-942 entity; ni/1/2/iic/t4 ta=60oc except ? where ta=65oc class 1, div 2, gps a,b, c,d; ex na [ia] iic t4 class 1, zone 2, aex na iic t4 ex (ia) iic ex (ia) iib ? model no. certificate no. MTL7706+ bas01atex7217 ex01e2219 3010737 1345550 mtl7707+ bas01atex7217 ex01e2219 3010737 1345550 mtl7707p+ bas01atex7218? ex01e2220? 3010737? 1345550 mtl7710+ bas01atex7217 ex01e2219 3010737 1345550 c16433 mtl7715+ bas01atex7217 ex01e2219 3010737 1345550 c16434 mtl7715p+ bas01atex7217 ex01e2219 3010737 1345550 c16611 mtl7722+ bas01atex7217 ex01e2219 3010737 1345550 c16435 mtl7728+/C/ac bas01atex7217 ex01e2219 3010737 1345550 c16397 mtl7728p+ bas01atex7217 ex01e2219 3010737 1345550 c16436 mtl7729p+ bas01atex7218? ex01e2220? 3010737? 1345550 c16612? mtl7741 bas01atex7217 ex01e2219 3010737 1345550 c16613 mtl7742 bas01atex7217 ex01e2219 3010737 1345550 c16614 mtl7743 bas01atex7217 ex01e2219 3010737 1345550 c16615 mtl7744 bas01atex7217 ex01e2219 3010737 1345550 c16616 mtl7745 bas01atex7217 ex01e2219 3010737 1345550 c16617 mtl7755ac bas01atex7217 ex01e2219 3010737? 1345550 c16450 mtl7756ac bas01atex7217 ex01e2219 3010737? 1345550 c16437 mtl7758+/C bas01atex7217 ex01e2219 3010737 1345550 c16618 mtl7760ac bas01atex7217 ex01e2219 3010737 1345550 c16619 mtl7761ac bas01atex7217 ex01e2219 3010737 1345550 c16438 mtl7761pac bas01atex7217 ex01e2219 3010737 1345550 mtl7764+ bas01atex7217 ex01e2219 3010737 1345550 c16440 mtl7764ac bas01atex7217 ex01e2219 3010737 1345550 c16441 mtl7765ac bas01atex7217 ex01e2219 3010737 1345550 c16620 mtl7766ac bas01atex7217 ex01e2219 3010737 1345550 c16442 mtl7766pac bas01atex7217 ex01e2219 3010737 1345550 c16443 mtl7767+ bas01atex7217 ex01e2219 3010737 1345550 c16444 mtl7778ac bas01atex7217 ex01e2219 3010737 1345550 c16621 mtl7779+ bas01atex7217 ex01e2219 3010737 1345550 c16445 mtl7787+ bas01atex7217 ex01e2219 3010737 1345550 c16447 mtl7787p+ bas01atex7217 ex01e2219 3010737 1345550 c16448 mtl7788+ bas01atex7217 ex01e2219 3010737 1345550 c16449 mtl7788r+ bas01atex7217 ex01e2219 3010737 1345550 c16449 mtl7789+ bas01atex7217 ex01e2219 3010737 1345550 c16622 mtl7796+ bas01atex7217 ex01e2219 3010737 1345550 c16446 mtl7796C bas01atex7217 ex01e2219 3010737 1345550 c16446 mtl7798 ni only www..net
europe (emea) tel: +44 (0)1582 723633 fax: +44 (0)1582 422283 americas tel: +1 281 571 8065 fax: +1 281 571 8069 asia pacific tel: +65 6 487 7887 fax: +65 6 487 7997 e-mail: enquiry@mtl-inst.com web site: www.mtl-inst.com aug 2009 notes: 1 'ac' indicates a non-polarised, star-connected barrier configuration. 2 when the external circuit contains no lumped inductance greater than 10 m h, the cable inductance may be increased to the values within parentheses. 3 see next page. for further barrier channel configuration data, please refer to the relevant certificate. maximum cable parameters (for the latest information see www.mtl-inst.com/support/certificates) model no. ac 1 /dc note 3 ref. baseefa group iic matched power (w) fm (grps a&b) matched power (w) c (mf) l 2 (mh) l/r (h/w) c (mf) l 2 (mh) l/r (h/w) MTL7706 + a 0.083 3.05 (4.2) 56 0.65 0.083 4.2 56 0.65 mtl7707 + a1/a2/b 0.083 3.05 (4.2) 56 0.65 0.083 4.2 56 0.65 mtl7710 + a 3 0.91 74 0.50 3 0.91 74 0.50 mtl7715 + a 0.58 1.45 66 0.56 0.58 1.45 66 0.56 mtl7715p + a 0.580 0.33 28 1.09 0.580 0.33 28 1.09 mtl7722 + a 0.165 1.45 45 0.81 0.165 1.45 45 0.81 mtl7728 +/-/ac a 0.083 3.05 (4.2) 56 0.65 0.083 3.05 (4.2) 56 0.65 mtl7728p + a 0.083 1.82 (2.51) 44 0.83 0.083 1.82 (2.51) 44 0.83 mtl774x b3 2.86 96 742 2.86 96 742 0.039 mtl7755 ac a1/a2 100 0.46 145 0.225 100 0.46 145 0.225 b 100 0.13 69 0.45 40 0.13 69 0.45 c 40 0.41 73 0.45 40 0.13 69 0.45 mtl7756 ac a1/a2/a3 100 0.46 145 0.225 100 0.46 145 0.225 b1 100 0.13 69 0.45 40 0.13 69 0.45 b2 100 0.06 44 0.675 40 0.13 69 0.45 c1 40 0.41 73 0.45 40 0.13 69 0.45 c2 40 0.23 61 0.60 40 0.06 44 0.675 mtl7758 +/- a1/a2 11.1 0.07 26 1.40 11.1 0.07 26 1.4 b 11.1 0.02 10 2.8 8.8 0.02 10 2.8 mtl7760 ac a1/a2 3 0.91 74 0.5 3 0.91 74 0.5 b 3 0.20 27 1.00 3 0.20 35.6 1.00 mtl7761 ac a1/a2 4.9 3.72 163 0.225 4.9 3.72 163 0.225 b 4.9 0.91 62 0.45 0.31 0.91 62 0.45 c 0.31 3.72 81 0.45 0.31 0.91 62 0.45 mtl7761p ac a1/a2 4.9 56 613 0.058 4.9 56 613 0.058 b 4.9 14 236 0.115 0.31 14.0 236 0.115 c 0.31 56 306 0.115 0.31 14.0 236 0.115 mtl7764 + a1/a2 1.41 240 1000 0.036 1.41 240 1000 0.036 b 1.41 61 360 0.072 1.0 61 360 0.072 mtl7764 ac a1/a2 1.41 240 1000 0.036 1.41 240 1000 0.036 b 1.41 61 360 0.072 0.125 61 360 0.072 c 0.125 240 500 0.072 0.125 61 360 0.072 mtl7765 ac a1/a2 0.580 1.45 66 0.56 0.580 1.45 66 0.56 b 0.580 0.32 22 1.125 0.58 0.32 31.6 1.12 mtl7766 ac a1/a2 1.41 5.8 151 0.24 1.41 5.8 151 0.24 b 1.41 1.47 58 0.48 0.125 1.47 58 0.48 c 0.125 5.8 75 0.48 0.125 1.47 58 0.48 mtl7766p ac a1 1.41 1.47 78 0.471 1.41 1.47 78 0.471 b 1.41 0.34 29 0.942 0.125 0.34 29 0.942 c 0.125 1.15 39 0.942 0.125 0.34 29 0.942 mtl7767 + a1/a2 0.58 1.45 66 0.56 0.58 1.45 66 0.56 b 0.58 0.32 22 1.125 0.58 0.32 22 1.125 mtl7778 ac a1/a2 0.083 16 107 0.33 0.083 16 107 0.33 b 0.083 3.05 (4.2) 42 0.33 0.083 4.0 107 0.654 mtl7779 + a1/a2 0.083 3.05 (4.2) 56 0.65 0.083 3.05 (4.2) 56 0.65 b not permitted mtl7787 +/- a1 0.083 3.05 (4.2) 56 0.65 0.083 3.05 (4.2) 56 0.65 a2 0.083 0.083 b 0.083 3.05 (4.2) 56 0.65 0.011 4.2 56 0.65 mtl7787p + a1 0.083 1.82 (2.51) 44 0.835 0.083 1.82 (2.51) 44 0.83 a2 0.083 0.083 b 0.083 1.82 (2.51) 44 0.835 0.78 2.51 44 0.835 mtl7788 + a1 0.083 3.05 (4.2) 56 0.65 0.083 3.05 (4.2) 56 0.65 a2 3.0 0.91 74 0.5 3.0 0.91 74 0.5 b 0.083 0.33 25 0.92 0.083 0.33 25 0.92 mtl7788r + a1 0.083 3.05 (4.2) 56 0.65 0.083 3.05 (4.2) 56 0.65 a2 3.0 0.91 74 0.5 3.0 0.91 74 0.5 b 0.083 0.33 25 0.92 0.083 0.33 25 0.92 mtl7789 + c 0.083 16 106 0.33 0.083 16 106 0.33 mtl7796 +/- a1 0.1 4.91 64 0.56 0.1 4.91 64 0.56 a2 0.22 13 136 0.26 0.22 13 136 0.26 b 0.1 1.94 34 0.81 0.096 1.94 34 0.81 model no. ac 1 /dc note 3 ref. baseefa group iib matched power (w) fm (grps c-g) matched power (w) c (mf) l 2 (mh) l/r (h/w) c (mf) l 2 (mh) l/r (h/w) mtl7707p + a1 0.65 5.34 125 1.20 0.65 5.34 125 1.20 b 0.65 5.34 125 1.20 0.587 5.34 125 1.20 mtl7729p + a1 0.65 5.65 127 1.19 0.65 5.65 127 1.19 www..net
europe (emea) tel: +44 (0)1582 723633 fax: +44 (0)1582 422283 americas tel: +1 281 571 8065 fax: +1 281 571 8069 asia pacific tel: +65 6 487 7887 fax: +65 6 487 7997 e-mail: enquiry@mtl-inst.com web site: www.mtl-inst.com aug 2009 correlation between mtl7700 mtl7000 mtl700 barriers (iic) note 3 : the circuit configuration for the output parameters given in the table maximum cable parameters are as follows:- a single channel barrier. a1 first channel of a dual/triple channel barrier. a2 second channel of a dual/triple channel barrier. a3 third channel of a dual/triple channel barrier. b both channels of a dual channel barrier connected in parallel, with respect to earth. b1 two channels of a triple channel barrier connected in parallel, with respect to earth. b2 three channels of a triple channel barrier connected in parallel, with respect to earth. b3 both channels of each switch input connected together c both channels of a dual channel barrier interconnected, with no earth return. c1 two channels of a triple channel barrier interconnected, with no earth return. c2 three channels of a triple channel barrier interconnected, with no earth return. this assumes two of the channels are in parallel. module no. bussed power mtl7000 equivalent mtl7000 original certificate number(s) mtl7000 atex certificate number(s) mtl700 equivalent mtl700 original certificate number(s) mtl700 atex certificate number(s) typical application mtl7710+ no half of mtl7162+ ex95c2261 bas99atex7285 mtl710+ ex832452 bas01atex7202 4/6v systems mtl7715+ no n/a n/a n/a mtl715+ ex832452 bas01atex7202 12v systems mtl7715p+ no n/a n/a n/a mtl715p+ ex92c2373 bas01atex7202 12v systems mtl7722+ no mtl7122+ ex95c2261 bas99atex7285 mtl722+ ex832452 bas01atex7202 general purpose mtl7728+/- no mtl7028+/- mtl7128+/- ex95c2261 bas99atex7285 mtl728+/- ex832452 bas01atex7202 analogue / digital mtl7728ac no n/a n/a n/a mtl728ac ex832452 bas01atex7202 general purpose mtl7728p+ no mtl7128p+ ex95c2261 bas99atex7285 mtl728p+ ex92c2373 bas01atex7202 analogue / digital mtl7755ac no mtl7055ac ex95c2261 bas99atex7285 mtl755ac ex832452 bas01atex7202 rtd, grounded mtl7756ac no mtl7056ac ex95c2261 bas99atex7285 n/a n/a n/a rtd, grounded mtl7758+/- no n/a n/a n/a mtl758 ex83453 bas01atex7217 active sensors, mtl7760ac no n/a n/a n/a mtl760ac ex832452 bas01atex7202 active sensors, thermocouples mtl7761ac no mtl7261ac ex95c2261 bas99atex7285 mtl761ac ex832452 bas01atex7202 strain gauges mtl7761pac no mtl7061pac mtl7161pac ex95c2261 bas99atex7285 mtl761pac ex92c2373 bas01atex7202 load cell mtl7764+ no mtl7164+ ex95c2261 bas99atex7285 mtl764+ ex832452 bas01atex7202 high resistance mtl7764ac no mtl7264ac ex95c2261 bas99atex7285 mtl764ac ex832452 bas01atex7202 strain / level gauges mtl7765ac no n/a n/a n/a mtl765ac ex832452 bas01atex7202 general purpose mtl7766ac no n/a n/a n/a mtl766ac ex832452 bas01atex7202 strain gauges mtl7766pac no mtl7066pac mtl7166pac ex95c2261 bas99atex7285 mtl766pac ex92c2373 bas01atex7202 strain gauges mtl7767+ no mtl7167+ ex95c2261 bas99atex7285 mtl767+ ex832452 bas01atex7202 dual mtl715 mtl7779+ no n/a n/a n/a mtl779+ ex832452 bas01atex7202 dual mtl728 mtl7787+/- yes mtl7087+ mtl7187+ ex95c2261 bas99atex7285 mtl787s+ ex832452 bas01atex7202 analogue / digital mtl7787p+ yes mtl7087p+ mtl7187p+ ex95c2261 bas99atex7285 mtl787sp+ ex92c2373 bas01atex7202 analogue / digital mtl7788+ yes n/a n/a n/a mtl788+ ex832452 bas01atex7202 transmitters mtl7788r+ yes n/a n/a n/a mtl788r+ ex832452 bas01atex7202 15v systems mtl7796+/- no mtl7096- mtl7196- ex95c2261 bas99atex7285 mtl796+/- ex832452 bas01atex7202 vibration sensors www..net

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