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User Manual for the
WPS Series Wireless Pressure Sensor
Figure 2. WPS Functional Block Diagram
4.3.2 Sensor Module
Two versions are available, GP (gage pressure), or AP (absolute pressure). For the gage pressure models, a vent tube is connected
internally between the pressure sensor module and a front cover mounted vent with gore membrane cover. Electrical signals from the
sensor connect to A/D converter through a multuplexer switch.
4.3.3 Measurement Board
The microprocessor is connected to a non-volatile random access memory (NVRAM) containing:
•
Characterization Data, loaded at time of manufacture, which identifies the specific measurement hardware installed, pressure
range, burst pressure, GP or AP type, etc... Also stored here are the default user settings. After a hard reset (cold restart),
any User Settings are replaced with the default User Settings. None of the characterization data is user changeable.
•
Calibration data, from the factory calibration procedure. This data is not user-eraseable or changeable.
•
Program code, loaded or updated over the air, through the WDM Interface
•
User settings, selected through the WDM interface, such as publication rate, LCD display timing, measurement units, etc...
A small reset button and green led are mounted on the measurement board, used to cause a hard reset (cold restart) of the micropro-
cessor program. Refer to the WPS Series Professional Install Guide for reset procedures.A multiplexer (electronic switch) is connected
between the inputs to be measured and the A/D converter, allowing the microprocessor to measure the pressure signal, the battery
voltage, or the internal unit temperature sensor, as required.
A/D (Analog-to-Digital) hardware on the measurement board provides 12 bits of precision.
10
Honeywell Sensing and Control
50095584
ISSUE 1
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