SSI Technologies – Application Note PS-AN2
MediaSensor? Absolute, Sealed, Gage Pressure Sensors
Family Product Overview
Ratiometric outputs vary as a ratio of the supply
voltage.
MediaSensor ? Compensations Features
All the compensation
circuitry
is internal
to the
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
MediaSensor ? pressure transducer. No
compensation modules are needed.
1) Zero balancing (Null Offset) Calibration
external
electromagnetic interference.
Some piezoresistive pressure transducers use only an
unprotected silicon sensing element. Silicon is a brittle
crystalline material, which can sometimes crack under
severe cold transient environments. The MediaSensor?
pressure transducer uses an 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. The 316L stainless
steel diaphragm not only 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 does not gel and acts as a buffer
During manufacturing the Wheatstone Bridge resistive
elements are closely matched and compensated, however
an offset voltage (due to resistance 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 final stabilized
value as it warms up. SSI MediaSensor ? compensates
for this span variation over operating temperature range.
for
the silicon sensing element from the extreme
temperature transients found in certain applications such as
refrigeration.
SSI TECHNOLOGIES, INC.
Controls Division
2643 W. Court Street
Janesville, WI 53548-5011
Copyright January 12, 2009
SSI Technologies Inc.
All Rights Reserved
Revision 3
Phone: (608)758-1500 Fax: (608) 758-2491
www.ssitechnologies.com
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