ssi technologies, inc. controls division 2643 west court street janesville, wi 53548 - 5011 phone: (608)758 - 1500 fax: (608)758 - 2491 1 copyright nov ember 6 , 200 8 ssi technologies inc. all rig hts reserved revision 3 ssi techno logies ? application note ps-an5 mediagauge ? (model mg a-9v ) digital pressure ga ge product overview product description the mediagauge ? model mg a - 9v is a nema 4x rated stand alone 9v battery operated multi - functional digital pressure gage. the mga - 9v digital pressure gage consists of a piezoresistive pressure sensing element, signal conditioning circuitry for temperature and calibration compensation, a 304l stainless steel pressure port and a lcd back lit display . the mga - 9v is a lower cost digital pressure gage in the mediagauge ? family with accuracy of 1. 0 % full scale for dry air and non - corrosive gas applications only . the mediagauge ? mga - 9v comes standard with a variety of keypad operated functions ? multiple pressure unit display reading ( psi, bar or mpa ); memory storage o f maximum peak pressure reading; and zero adjustment. the mga - 9v digital pressure gage has better accuracy, longer life and standard multiple functions which make it a better choice than mechanical pressure gage s. these compact 2 ? inch , robust gage s measu re pressures from 30 psi to 300 p si . product features ? accuracy: 1.0 % full scale ? pressure ranges : 30 , 100, 300 psi ? keypad operated functions: auto zero and peak hold ? operating temperature: - 1 0 c to 60 c ? storage temperature: - 20 c to 85 c mediagauge ? model mga -9v with rubber boot option ? typical applications : process control; compressors ? nist traceable certificates available ? nema 4x ratin g ? chemical compatibilities : non - corrosive gases and dry air ? lcd display battery saver mode: mga - 9v automatically powers down after 3 minutes. ? multiple pressure units: psi, bar, mpa (k g/cm 2 ) ? compact, robust package: 2 ? inches with black abs thermoplastic case
ssi technologies, inc. controls division 2643 west court street janesville, wi 53548 - 5011 phone: (608)758 - 1500 fax: (608)758 - 2491 2 copyright nov ember 6 , 200 8 ssi technologies inc. all rig hts reserved revision 3 ssi techno logies ? application note ps-an5 mediagauge ? (model mg a-9v ) digital pressure ga ge product overview measurement tech n ology in general, p ressure m easurement technology translat es a force from an induced pressure into an electrical quantity. in digital pressure gage s, the electrical quantity is then translated into pressure units and digitally displayed. the ssi?s mediagauge ? mga - 9v digital pressure gage includes a n 304l stainless steel input pressure port, a piezoresistive pressure sensing element, signal conditioning circuitry for temperature and calibration compensation, and a lcd that displays the pressure measured in eit her psi, bar or mpa (k g/cm 2 ) units. the piezoresistive sensing element contains a silicon crystal semiconductor . strain gage s (resistive elements) in the silicon are used in a whe a tstone bridge circuit. when pressure is applied, t he resistivity of the strain gage s changes proportional to the pressure applied . one leg of the bridge measure s the input pressures port. t he other leg of the bridge is connected to the reference port (vacuum pressure 0 psi) th e input pressure port is compared to. since p i ezoresistive pressure sensors are sensitive to changes in temperature, t he media gauge ? uses signal conditioning to compensate for temperature and calibration . the output signal is then converted into one of 3 user selectable f orms (select units with the on /unit/off button ) : 1) psi 2) b ar 3) mpa (kg/cm 2 ) the mediagauge ? mga - 9v will display the pressure reading after the on/unit /off button is depressed. the pressure measurement reading is updated 3 times per second. mediagauge? mga - 9v panel the mediagauge ? mga - 9v panel has a lcd display and three multi - functional buttons ? on/unit/off; light /p - h (peak - held) and reset/clear. the on/unit/off button is used to display the pressure reading; switch between pressure units (psi; bar; and mpa) and to power down the unit . to power on the un it: p ress the on/unit/off button. the mediagauge ? mga - 9v has a battery saver mode and will automatically shut itself off after 5 minutes . to display the pressure reading in a different pressure unit: c ontinue to press the on/unit/off button until the arrow in the lcd points to the pressure units desir ed. to manually power down the unit: p ress the on/unit/off button and hold down for 3 seconds until off is displayed and then release the button. the light /p - h (peak - held) button is used to turn the lcd light on/off and to display the maximum peak pressur e the unit has measured . to turn the lcd light on : p ress the light /p - h button once. to turn the lcd light off : p ress the light/p - h button again.
ssi technologies, inc. controls division 2643 west court street janesville, wi 53548 - 5011 phone: (608)758 - 1500 fax: (608)758 - 2491 3 copyright nov ember 6 , 200 8 ssi technologies inc. all rig hts reserved revision 3 ssi techno logies ? application note ps-an5 mediagauge ? (model mg a-9v ) digital pressure ga ge product overview to see the maximum peak pressure the unit has measured: p ress and hold down the light /p - h button for 3 sec onds. the maximum pressure reading will be blinking. if the maximum pressure read was over the unit?s maximum pressure range, o. l will be blinking on the display. to return to the current pressure reading: p ress the light / p - h button and hold down for 3 seconds. the reset/clear button is used to reset the gage to whatever pressure is currently being applied to the port and to clear the stored maximum peak pressure reading. to reference your mediagauge? d igital pressure gage to the input port: p ress and hold the reset/clear button for 3 seconds . the mediagauge? mga - 9v will now be reference to your input port. for example, if you have 20 psi on the display and then you press and hold the res et/clear button for 3 seconds the display will show 0.0 psi. a measurement of 30 psi would then read as 10 psi on the display. to reset the mediagauge ? digital pressure gage : m ake sure the input port is either disconnected or connected to a 0 psi input. press and hold down the reset/clear button for 3 seconds. to clear the maximum peak pressure reading: p ress and hold down the light /p - h button for 3 seconds until the maximum pressure reading appears on the lcd (it will be blinking). release the light /p - h button. press and hold down reset/clear button for 3 seconds. installation /mounting 1) mount the mediagauge ? mga - 9v digital pressure gage on a suitable (1/4? npt) female fitting. use teflon tape or pipe dope to seal the threads. 2) do no over tighten. torque to 150 in lbs +/ - 1 in lb. electrical specifications supply voltage 9v battery response time < 1 ms accuracy 1.0 fs lcd resolution (30 psi) 0.01 lcd resolution (100 ; 300 psi) 0.1 proof pressure 3 x full scale burst pressure 10 x full scale or 15,000 psi whichever is less operating temperature range - 10 to 60c (14 to 140 f) storage temp erature range -20 to 85 c ( - 4 to 185 f)
ssi technologies, inc. controls division 2643 west court street janesville, wi 53548 - 5011 phone: (608)758 - 1500 fax: (608)758 - 2491 4 copyright nov ember 6 , 200 8 ssi technologies inc. all rig hts reserved revision 3 ssi techno logies ? application note ps-an5 mediagauge ? (model mg a-9v ) digital pressure ga ge product overview tested conditions humidity 250 hours (40 c and 90% to 95% r.h. pressure/temperature cycles > 1.8 million cycles (0 to fs @ 8hz and -20 to 85 c) thermal shock 250 cycles (85 to -20 c. 0.5 hr soaks at tempera ture vibration 144 hours (100 to 2000 hz, 20g sinusoidal in 3 axes)
ssi technologies, inc. controls division 2643 west court street janesville, wi 53548 - 5011 phone: (608)758 - 1500 fax: (608)758 - 2491 5 copyright nov ember 6 , 2008 ssi technologies inc. all rights reserved revision 3 ssi techno logies ? application note ps-an5 mediagauge ? (model mg a-9v ) digital pressure ga ge product overview mediagauge? mga - 9v with 22mm hex and 1/4" - 18 npt process connection
ssi technologies, inc. controls division 2643 west court street janesville, wi 53548 - 5011 phone: (608)758 - 1500 fax: (608)758 - 2491 6 copyright nov ember 6 , 2008 ssi technologies inc. all rights reserved revision 3 ssi techno logies ? application note ps-an5 mediagauge ? (model mg a-9v ) digital pressure ga ge product overview digital pressure g age ordering system the following explains ssi?s mediagauge ? digital pressure gage order number sequence. example mg a - 3 00 - a - 9v product family ? mga pressure ranges ? 30 ? 100 ? 300 port configuration hex port ? a 22mm 1/4 - 18 npt connector ? 9v battery, operated rubber boot options : o rder p/n 24610 .1 for model mga
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