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SSI Technologies – Application Note PS-AN7
MediaGauge? (Model MG-MD) Digital Pressure Gauge
Product Overview
The piezoresistive sensing element contains an oil-filled
Typical Applications : General Purpose, Test, Process
Control; MRO, Water, Compressors, Refrigeration; Fuel
Cells; Pumps; Hydraulics; Spraying Systems;
Pneumatics; Flow; Robotics; Agriculture; Hydrogen
Storage
NEMA 4X Rating
micro-machined 316L stainless steel convoluted diaphragm
and a silicon crystal semiconductor. The silicon crystal
sensor is mounted on a 304L stainless steel housing and
laser welded to the diaphragm. Optimal media isolation is
achieved when the media’s pressure acts directly on the
316L stainless steel diaphragm and is then transferred
through the oil to the silicon sensor.
NIST traceable certificates available
Strain gauges (resistive elements) in the silicon are used in
Chemical Compatibilities: Any gas or liquid
compatible with 304L Stainless Steel. For example,
Motor Oil, Diesel, Hydraulic fluid, brake fluid, water,
waste water, Hydrogen, Nitrogen, and Air.
Multiple Pressure Units: PSI, BAR, MPA (kg/cm2)
Compact, Robust Package: 3 inches with black ABS
Thermoplastic case
Measurement Technology
In general, pressure measurement technology translates a
force from an induced pressure into an electrical quantity. In
digital pressure gauges, the electrical quantity is then
translated into pressure units and digitally displayed.
The SSI’s MediaGauge? MG-MD digital pressure gauge
consists of a 304L stainless steel input pressure port; a
piezoresistive pressure sensing element; signal conditioning
circuitry for temperature and calibration compensation; a
LCD that displays the pressure measured in either PSI,
BAR or MPA (kg/cm2) units; a 4-20 mA output signal and a
limit switch (NPN transistor output).
SSI TECHNOLOGIES, INC.
Controls Division
2643 West Court Street
Janesville, WI 53548-5011
Phone: (608)758-1500
Fax: (608)758-2491
a Wheatstone Bridge circuit. When the media’s pressure is
applied, the resistivity of the strain gauges changes
proportional to the pressure applied. One leg of the bridge
measures the input pressures port. The other leg of the
bridge is connected to the reference port (vacuum pressure
0 PSI) the input pressure port is compared to.
Since piezoresistive pressure sensors are sensitive to
changes in temperature, the MediaGauge? MD-MG digital
pressure gauge uses signal conditioning to compensate for
temperature and calibration prior to outputting the LCD
signal. The output signal is then converted into one of 3
user selectable forms (select units with the UNIT/SET
button):
1) PSI
2) BAR
3) MPA (kg/cm2)
The MediaGauge? MG-MD digital pressure gauge will
display the pressure reading after the UNIT/SET button is
depressed. The pressure measurement reading is updated
3 times per second.
Copyright January 30, 2009
SSI Technologies Inc.
All Rights Reserved
Revision 4
www.ssitechnologies.com
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