Honeywell Switches and Sensors - Manual (Page 129)

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PRESSURE SENSORS
Pressure Sensors
Honeywell has over 40 years of experience in the pressure transducer
industry. We offer three pressure sensor measurement types - absolute,
differential and gage - including vacuum gage and bidirectional types. A wide
variety of pressure ranges, along with both amplified and unamplified
versions, are available. Silicon-based versions in stainless steel and brass
housings allow for use in harsh environmental conditions. A wide choice of
mounting, package, and port configurations allows customers to choose from
standard off-the-shelf designs.
Pressure sensors contain sensing elements that consist of four piezoresistors
buried in the face of a thin, chemically-etched silicon diaphragm. A pressure
change causes the diaphragm to flex, inducing a stress or strain in the
diaphragm and the buried resistors. The resistor values change in proportion
to the stress applied and produce an electrical output.
All Honeywell pressure sensors feature excellent repeatability, high accuracy
and reliability under varying environmental conditions. In addition, they
feature highly consistent operating characteristics from one sensor to the next
and interchangeability without recalibration.
Stainless Steel versions
Honeywell also offers stainless steel pressure transducers that use bonded
strain gauge technology with stainless steel media isolation, which eliminates
the need for internal seals. Our stainless steel pressure transducers utilize
bonded semiconductor strain gauge technology and are designed for
demanding environments involving corrosive media. They are manufactured
in a variety of packages that are widely used in medical equipment,
compressors, hydraulic controls, transportation, agriculture, and refrigeration
applications. Laser trimmed and tested, they are fully calibrated and
temperature compensated to assure long-term reliability and performance.
Stainless steel pressure transducers are fully compensated to eliminate known
sources of errors.
Most of our transducers utilize the ‘bonded strain gage’ technology and are
fully stainless steel media isolated, eliminating the need for internal elastomer
seals. Our strain gage design is very resistant to the effects of shock,
vibration and hostile environments. All of our transducers are fully
compensated and tested against the appropriate specifications before
shipment.
High Purity versions
High purity pressure sensors are focused on high-purity applications in the
wafer-processing segment of the semiconductor industry. With ISO 9001
certified facilities and Class 10 cleanroom capability, Honeywell manufactures
a full line of high purity pressure sensing and control products; each
individually tested, inspected and certified to be in full compliance with the
product specification.
The long life of the high-purity pressure sensors, coupled with long-term
stability, greatly reduces or eliminates the need for zero and span adjustments.