SSI Technologies Application Note PS-AN5 MediaGauge (Model MGA-9V) Digital Pressure Gage Product Overview Product Description The MediaGauge Model MGA-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 MediaGauge Model MGA-9V with rubber boot option of keypad operated functions multiple pressure unit display reading (PSI, BAR or MPA) memory storage of Typical Applications: Process Control Compressors maximum peak pressure reading and zero adjustment. NIST traceable certificates available NEMA 4X Rating The MGA-9V digital pressure gage has better accuracy, longer life and standard multiple functions which make it a Chemical Compatibilities: Non-corrosive gases and better choice than mechanical pressure gages. These dry air compact 2 inch, robust gages measure pressures from LCD Display Battery Saver Mode: MGA-9V 30 PSI to 300 PSI. automatically powers down after 3 minutes. Multiple Pressure Units: PSI, BAR, MPA (kg/cm) Product Features Compact, Robust Package: 2 inches with black Accuracy: 1.0 % Full Scale ABS Thermoplastic case Pressure Ranges: 30, 100, 300 PSI Keypad Operated Functions: Auto zero and peak hold Operating Temperature: -10C to 60C Storage Temperature: -20C to 85C SSI TECHNOLOGIES, INC. Controls Division Copyright August 30, 2012 1309 Plainfield Ave. SSI Technologies Inc. Janesville, WI 53545-0450 All Rights Reserved Phone: (608)758-1500 Revision 3 Fax: (608)758-2491 www.ssitechnologies.com 1 SSI Technologies Application Note PS-AN5 MediaGauge (Model MGA-9V) Digital Pressure Gage Product Overview Measurement Technology The MediaGauge MGA-9V will display the pressure reading after the ON/UNIT/OFF button is depressed. The In general, pressure measurement technology translates a pressure measurement reading is updated 3 times per force from an induced pressure into an electrical quantity. In second. digital pressure gages, the electrical quantity is then translated into pressure units and digitally displayed. MediaGauge MGA-9V Panel The SSIs MediaGauge MGA-9V digital pressure gage The MediaGauge MGA-9V panel has a LCD display and includes an 304L stainless steel input pressure port, a three multi-functional buttons ON/UNIT/OFF LIGHT/P-H piezoresistive pressure sensing element, signal conditioning (Peak-Held) and RESET/CLEAR. circuitry for temperature and calibration compensation, and a LCD that displays the pressure measured in either PSI, The ON/UNIT/OFF button is used to display the BAR or MPA (kg/cm) units. pressure reading switch between pressure units (PSI BAR and MPA) and to power down the unit. The piezoresistive sensing element contains a silicon crystal semiconductor. Strain gages (resistive elements) in To power on the unit: Press the ON/UNIT/OFF button. The the silicon are used in a Wheatstone Bridge circuit. When MediaGauge MGA-9V has a battery saver mode and will pressure is applied, the resistivity of the strain gages automatically shut itself off after 5 minutes. changes proportional to the pressure applied. One leg of To display the pressure reading in a different pressure unit: the bridge measures the input pressures port. The other Continue to press the ON/UNIT/OFF button until the arrow leg of the bridge is connected to the reference port (vacuum in the LCD points to the pressure units desired. pressure 0 PSI) the input pressure port is compared to. To manually power down the unit: Press the ON/UNIT/OFF Since piezoresistive pressure sensors are sensitive to button and hold down for 3 seconds until OFF is displayed changes in temperature, the MediaGauge uses signal and then release the button. conditioning to compensate for temperature and calibration. The output signal is then converted into one of 3 user The LIGHT/P-H (Peak-Held) button is used to turn the selectable forms (select units with the ON/UNIT/OFF LCD LIGHT on/off and to display the maximum peak button): pressure the unit has measured. 1) PSI To turn the LCD LIGHT on: Press the LIGHT/P-H button once. 2) BAR To turn the LCD LIGHT off: Press the LIGHT/P-H button 3) MPA (kg/cm) again. SSI TECHNOLOGIES, INC. Controls Division Copyright August 30, 2012 1309 Plainfield Ave. SSI Technologies Inc. Janesville, WI 53545-0450 All Rights Reserved Phone: (608)758-1500 Revision 3 Fax: (608)758-2491 www.ssitechnologies.com 2