62BSignal Conditioner/Electronics
6BChapter Three: Overview
36
Signal Conditioner/Electronics
The signal conditioner contains state-of-the-art, low impedance balanced bridge circuitry, self-
compensated for thermal stability with ambient temperature changes. The output is a DC voltage
that is then digitally linearized and calibrated against a pressure standard to produce both analog
and digital outputs.
Pressure Measurement
The digital output is read through the DeviceNet interface. The reported pressure value is based
on a number of variables, many of which are user-adjustable through software commands. Figure
4, page 37, illustrates how actual pressure values are generated from the raw sensor output.
The raw pressure reading (both analog and digital) can be re-zeroed either by using the OneTouch
Coarse Zero Push Button located on top of the transducer or by issuing the DeviceNet service
0x32 (the Coarse Zero Adjustment service). Analog and digital signals are automatically
corrected for shifts caused by large temperature variations. The zero-corrected signals are then
linearized and provided as 0 to 10 V analog signal and as a digital output that is expressed either
in the user-selected unit of pressure or as a 16-bit integer.
An additional zero offset can be applied digitally to the corrected pressure value, both analog and
digital, before the value is converted to the selected units.
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