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User Manual for the
WPS Series Wireless Pressure Sensor
4.3.4 Radio Board
The radio board contains a microprocessor with NVRAM to store its program code and operating parameters. These parameters
include channel selection, link options, and other mode options, as set though the
Board is connected to a short cable assembly containing the sensor external antenna connector.
m CAUTION
Applying power to the sensor with no antenna connected to the radio board could permanent damage to the sensor on the radio
board.
4.3.5 LCD Display
The optional LCD display is connected through a cable assembly to the measurement board. It is activated as required, by the mea-
surement board, in accordance with the
4.3.6 Battery
The battery consists of two each, D-sized Lithium Thyonal Chloride cells. Each cell provides 3.6 Vdc and the two cells are wired in se-
ries to provide 7.2 Vdc to operate all circuits in the sensor. There is no on/off switching, so when the batteries are installed, the sensor
is active. See Section 5 for battery considerations and Section 6 for battery replacement procedures.
4.3.7 Battery Life
The battery life depends on three factors:
•
Publication Rate - Setting a higher publication rate increases battery consumption
•
LCD display timing - Setting the LCD to display continuously or for longer periods will increase battery consumption.
•
R.F. Link Data Retransmissions - When the WPS Series Wireless Pressure Sensor needs to send a packet of data to the near-
est AP (publish), it transmits the packet and waits for an acknowledgement. Normally, it receives the acknowledgement im-
mediately, stops, and waits for the next scheduled transmission time. A long R.F. path, interfering materials (metal structures,
etc.), or R.F. interference from other nearby transmitters, may cause the transmitted packet to be "dropped". If this occurs,
the Sensor will re-try to send the packet. It will re-try two more times, waiting for an acknowledgement. These extra re-trans-
missions will greatly increase the battery useage and reduce battery life.
Typical battery life is estimated to be as much as 7.5 years for 60 sec. publication rates, to as low as 2 years for 1 sec. publication
rates.
LCD timing User
Options.
ISSUE 1
WDM interface.
A small R.F. connector on the Radio
Honeywell Sensing and Control
50095584
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