ssi technologies, inc. controls division 2643 w. court street janesville, wi 53548 - 5011 phone: (608)758 - 1500 fax: (608) 758 - 2491 www.ssitechnologies.com page 1 copyright january 12, 2009 ssi technologies inc. all rights reserved revision 3 rohs ssi technologies C application note ps - an2 mediasensor? absolute, sealed, gage pressure sensors family product overview product description the mediasensor ? (p51) family of bulk micro - machined, absolute, sealed and gage pressure sensors are for both harsh and benign media with superior accuracy over an operating temperature of - 40 c to 105 c . these compact, robust s ensors measure pressures from 3 psi to 5 ,000 psi and are well suited for a variety of automotive, industrial and commercial applications. product features ? superb accuracy: o +/ - 0.5% full scale for 75 psi to 5 000 psi o +/ - 1% full scale for 15 psi to 60 psi o +/ - 2 % full scale for 3 psi to 10 psi ? pressure ranges : 3 psi to 5 ,000 psi ? electronics : o 0.5 C 4.5 volt output (with 5v input) o 0.5 C 4.5 volt o utput with overvoltage protection (with 5v input) o 1 - 5 volt output (with 8 - 30v input) o 4 C 20 ma output (with 8 - 30v input) ? temperature range: - 40 c to 105 c ? maximum flexibility : custom asic provides signal conditioning for calibration and temperature compensation. ? standard and custom options available for oem quantities ? excellent price/performance ratio mediasensor ? family of pressure sensors with integrated signal conditioning ? compact, robust package: all laser - welded stainless steel design for optimal media isolation in compact size ? chemical compatibilities: any gas or liquid compatible with 304l & 316l stainl ess steel. for example, motor oil, diesel, hyd raulic fluid, brake fluid, water, waste water, hydrogen, nitrogen, and air. ? typical applications : refrigeration; fuel cells; pumps; hydraulics; process control; spraying systems; pneumatics; compressors; flow ; robotics; agriculture; hydrogen storage call us at 1 - 888 - 477 - 4320 o r visit our website: http://ssitechnologies.com
ssi technologies, inc. controls division 2643 w. court street janesville, wi 53548 - 5011 phone: (608)758 - 1500 fax: (608) 758 - 2491 www.ssitechnologies.com page 2 copyright january 12, 2009 ssi technologies inc. all rights reserved revision 3 rohs ssi technologies C application note ps - an2 mediasensor? absolute, sealed, gage pressure sensors family product overview standard full scale pressure ranges ? gage: 3, 5,10, 15, 25, 30, 50, 60, 75, 100, 120, 130, 200, 225, 250 a nd 300 psig ? sealed: 50, 100, 150, 200, 300, 400, 500, 750, 1000, 1500, 2000, 3000 and 5 000 psis ? absolute: 15, 30, 50, 65, 75, 100, 150, 200, 250, 300, 500, 750, 1000, 1500, 2000, and 3000 psia measurement tech n ology in general, p ressure m easurement technology translates force from an induced pressure into an electrical quantity. the mediasensor ? family of pressure transducers and transmitters use piezoresistive technology for its sensor signal processing to measure pressure. a micro - machined stainless steel convoluted diaphragm with a silicon crystal semiconductor is used. strain gauges (resis tive elements) in the silicon crystal are used in a whe a tstone bridge circuit. when pressure is applied, t he resistivity of the strain gauges changes proportional to the pressure applied . since a single silicon crystal is used it has a low mechanical hys teresis with good linearity. one leg of the bridge measure s the input pressures port. t he other leg of the bridge is connected to the reference port th e input pressure port is compared to. the c onnection to this reference port determines the pressure se nsing convention used . the mediasensor ? family comes in a choice of three pressure sensing type conventions: absolute, ga u ge (vented or sealed ). absolute mediasensors ? measure pressure relative to perfect vacuum pressure (0 psi ) which remains unchanged r egardless of temperature, location or other ambient conditions such as weather. absolute mediasensors ? are calibrated to have 0.5 vdc, 1 vdc, or 4 ma respectively at 0 psia . there are two different gauge pressure conventions C vented gauge and sealed gaug e. gauge mediasensors ? measure pressure relative to ambient room pressure through a port that is vented (open) to the atmosphere. gauge mediasensors ? are calibrated to have 0.5 vdc, 1 vdc, or 4 ma respectively at 0 psig . sealed mediasensors ? measure pres sure relative to a port that is connected to a sealed perfect vacuum chamber. sealed mediasensors ? are calibrated to 14.5 psi absolute. sealed mediasensors ? are calibrated to have 0.5vdc, 1 vdc, or 4 ma respectively at 14.5 psia . t he mediasensor ? takes t he two voltage output ports of the whe a tstone bridge and amplifies the signal. piezoresistive pressure sensors are sensitive to changes in temperature. t he mediasensor ? uses signal conditioning to compensate for temperature and calibration . the output si gnal is then converted int o one of four f orms : 1) 0.5 C 4.5 volt ratiometric output (transducer) 2) 0.5 C 4.5 v ratiometric output with overvoltage protection (transducer) 3) 1 C 5 volt output (transducer) 4) 4 C 20 ma output (transmitters)
ssi technologies, inc. controls division 2643 w. court street janesville, wi 53548 - 5011 phone: (608)758 - 1500 fax: (608) 758 - 2491 www.ssitechnologies.com page 3 copyright january 12, 2009 ssi technologies inc. all rights reserved revision 3 rohs ssi technologies C application note ps - an2 mediasensor? absolute, sealed, gage pressure sensors family product overview ratiometric outputs vary as a ratio of the supply voltage. transmitters are very suitable in applications that use long cables. there is virtually no error from voltage drop introduced from the wire resistance when sending the signal as a current. they are also less sensitive to electromagnetic interference. some piezoresistive pressure transducer s use only an unprotected silicon sensing element . silicon is a brittle crystalline material, which can sometimes crack under severe cold transient environments. the mediasensor? pres sure transducer uses a n additional 316l stainless steel convoluted diaphragm with a protective non - silicone oil to protect the sensitive silicon sensing element from the harsh media and environmental conditions. th e 316l stainless steel diaphragm not onl y provides for optimal water and chemical media isolation for the silicon crystal sensing element but can handle cold temperature transients without sustaining damage. under cold transient conditions and within our operating temperature range , the oil d oes not gel and acts as a buffer for the silicon sensing element from the extreme temperature transients found in certain applications such as refrigeration. mediasensor ? compensations features all the com pensation circuitry is internal to the medias ensor ? pressure transducer. no external compensation modules are needed. 1) zero balancing (null offset) calibration during manufacturing the wheatstone bridge resistive elements are closely matched and compensated, however an offset voltage (due to resista nce differences ) may still exist. ssi mediasensor ? compensates for this offset over operating temperature range (refer to table 1) . 2) span calibration the resistance of silicon gauges is temperature dependent. the span will shift with temperature to a fin al stabilized value as it warms up. ssi mediasensor ? compensates for this span variation over operating temperature range.
ssi technologies, inc. controls division 2643 w. court street janesville, wi 53548 - 5011 phone: (608)758 - 1500 fax: (608) 758 - 2491 www.ssitechnologies.com page 4 copyright january 12, 2009 ssi technologies inc. all rights reserved revision 3 rohs ssi technologies C application note ps - an2 mediasensor? absolute, sealed, gage pressure sensors family product overview typical connections the following torque limits should be used when mounting the mediasensor ? pressure port. straight thre ad w/o - ring: recommended torque high pressure (> 750 psi) 300 in lb all others with out port types t, u, y 150 in lb parts with ports t,u, y 120 in lb nptf thread: 2 t.f.f.t. (turns from finger tight) m ediasensor ? 4 - 20ma o utput connections: 1) connect the power lead (red) to the + terminal of the supply voltage. 2) connect the return l ead (white ) to the + terminal of the current measuring device 3) connect the C terminal of the current measuring device to the C terminal of the suppl y voltage. mediasensor ? voltage output connections: 1) connect the power lead (red) to the + terminal of the supply voltage. 2) connect the ground lead (black) and the C terminal of the supply voltage to C input of your voltage measurement equipment. 3) connect th e vout lead (white) to the + input of your voltage measurement equipment.
ssi technologies, inc. controls division 2643 w. court street janesville, wi 53548 - 5011 phone: (608)758 - 1500 fax: (608) 758 - 2491 www.ssitechnologies.com page 5 copyright january 12, 2009 ssi technologies inc. all rights reserved revision 3 rohs ssi technologies C application note ps - an2 mediasensor? absolute, sealed, gage pressure sensors family product overview packaging mediasensor ? is readily available in a large selection of standard packaging options. mediasensor ? offers an integral harness with 6 standard lengths and four standard readily available connector s (packard, deutsch, m12 and mini din). in addition, ssi will work with the customer to meet their needs with custom options for large volumes orders. (i.e... special fittings & connectors; special pressure ranges; operating te mperature; and increased accuracy). integral harness ( standard lengths of 6, 12, 18, 24, 36 and 72) . the harness can be constructed of either pvc jacketed 18 or 24 awg wire . wire color red - power white - return inte gral harness transmitter (4 to 20 ma) wire color red - power white - vout black - ground integral harness transducer(1 to 5 vdc or 0.5 to 4.5vdc)
ssi technologies, inc. controls division 2643 w. court street janesville, wi 53548 - 5011 phone: (608)758 - 1500 fax: (608) 758 - 2491 www.ssitechnologies.com 6 copyright janua ry 12, 2009 ssi technologies inc. all rights reserved revision 3 rohs standard connector options pin 1 - power 2 - not use d 3 - return packard connector transmitter (4 to 20 ma) pin 1 - power 2 - ground 3 - vout packard connector transducer (1 to 5 vdc or 0.5 to 4.5vdc) pin 1 - power 2 - not used 3 - retu rn deu tsch connector transmitter (4 to 20 ma) pin 1 - power 2 - ground 3 - vout d eu tsch connector transducer (1 to 5 vdc or 0.5 to 4.5vdc) ssi technologies C application note ps - an2 mediasensor? absolute , sealed, gage pressure sensors family product overview
ssi technologies, inc. controls division 2643 w. court street janesville, wi 53548 - 5011 phone: (608)758 - 1500 fax: (608) 758 - 2491 www.ssitechnologies.com 7 copyright janua ry 12, 2009 ssi technologies inc. all rights reserved revision 3 rohs pin 1 - power 2 - return 3 C not used 4 C not used m12 connector trans mitter (4 to 20 ma) pin 1 - power 2 - ground 3 C vout 4 C not used m12 connector transducer (1 to 5 vdc or 0.5 to 4.5vdc) pin 1 - power 2 - return 3 C not used 4 C not used d in 43650 transmitter connector pin 1 - power 2 - vout 3 C ground 4 C not used din 43650 transducer connector ssi technologies C application note ps - an2 mediasensor? absolute , sealed, gage pressure sensors family product overview
ssi technologies, inc. controls division 2643 w. court street janesville, wi 53548 - 5011 phone: (608)758 - 1500 fax: (608) 758 - 2491 www.ssitechnologies.com 8 copyright janua ry 12, 2009 ssi technologies inc. all rights reserved revision 3 rohs standard packaging options integral harness with 22mm hex integral harness with 5/8 hex harness constructio n: pvc jacketed 18 or 24 awg wire fo p lease visit our website at http://www.ssitechnologies .com for a more information and a listing of all the series of pressure sensors in the mediasensor ? family or call ssi toll - free at 1 - 888 - 477 - 4320 ssi technologies C application note ps - an2 mediasensor? absolute , sealed, gage pressure sensors family product overview
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