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SSI Technologies – Application Note PS-AN6
MediaGauge? (Model MG1-9V) Digital Pressure Gauge
Product Overview
Measurement Technology
Typical Applications : General Purpose, Test, Process
Control, MRO, Water, Compressors, Refrigeration; Fuel
Cells; Pumps; Hydraulics; Spraying Systems;
Pneumatics; Flow; Robotics; Agriculture; Hydrogen
Storage
NIST traceable certificates available
NEMA 4X Rating
Chemical Compatibilities: Any gas or liquid
compatible with 316L stainless steel. For example, Sea
Water, Salt Water, Motor Oil, Diesel, Hydraulic fluid,
Brake Fluid, Water, Waste Water, Hydrogen, Nitrogen,
and Air.
LCD Display Battery Saver Mode: MG1-9V
automatically powers down after 3 minutes.
Multiple Pressure Units: PSI, BAR, MPA (kg/cm2)
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
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? MG1-9V digital pressure gauge
includes an 316L 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 either PSI,
BAR or MPA (kg/cm2) units.
The piezoresistive sensing element consists of an oil filled
micro-machined 316L stainless steel convoluted diaphragm
with a silicon crystal sensor. 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.
Strain gauges (resistive elements) in the silicon are used in
a Wheatstone Bridge circuit. When 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.
Copyright November 6, 2008
SSI Technologies Inc.
All Rights Reserved
Revision 3
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