Chapter 2 ___________________________________________________________ Product Overview
VAISALA ________________________________________________________________________ 17
Analog Output Overrange Behavior
Analog outputs of the HMDW80 series transmitters have a defined
behavior when the values measured by the transmitter are outside the
scaled analog output range:
- Output is clipped at the end of the range.
- Output is set to error state when measured value is 5% outside the
scaled range. See section Analog Output Error State on page 41.
- Output resumes normal function when measured value is back on the
scaled range.
NOTE
HMW82/83 and TMW82/83 transmitters are different from the rest of
the HMDW80 series. Their
analog output is clipped at 10% outside the
scaled range, and their analog outputs enter the error state when the
measured value is 20% outside the range.
For example, consider the temperature output of the HMD82 transmitter.
The output is 4 ... 20 mA, scaled to -40 ... +60 °C (-40 ... +140 °F).
- When measured temperature rises above +60 °C (+140 °F), the output
rises to 20 mA and stops rising even if temperature rises further.
- If the temperature rises above +65 °C (+149 °F), the output enters the
error state of 3.6 mA.
NOTE
behavior does not mean there is a problem with the
measurements, and it does not affect the readings shown on the display
(if included in the transmitter model). The display always shows the
currently measured readings if the measurement is operating with
out
error. For more information on transmitter errors, see section
Error
on page 41.
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