Description
Description
The Model 1235 is a rugged 4-20 mA temperature /
humidity transmitter housed in stainless steel. It is
microprocessor-controlled and digitally calibrated. The
on-board temperature reading is used to compensate the
RH reading for temperature effects. Temperature
correction occurs whether or not the temperature loop is
used. It is essential to maintaining accuracy of RH
reading.
Either output or both outputs can be used. This allows
usage as temperature only, humidity only, or
temperature and humidity.
The on-board processor monitors for fault conditions. A
fault detected with the temperature or humidity reading
will cause that output to be driven to about 22.4 mA to
indicate an error condition. Wiring is accomplished via
flying leads.
The electronics are environmentally sealed. The ends of
the probe are also sealed to prevent moisture from
entering the electronics compartment. The unit can be
used over a temperature range of –40 to 85C. The RH
current output is scaled for 0 to 100% relative humidity.
The temperature current output is scaled for –50 to 100
degrees C. Other ranges could be made available
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