Vaisala HUMICAP HMT330 SERIES Guide de l'utilisateur Page 131

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Chapter 4 ________________________________________________________________ Operation
VAISALA ______________________________________________________________________ 129
Table 30 Relay State Examples
Criterion for
Relay Activation
Transmitter
Operation Status
NC-C
Connected
NO-C
Connected
Not chosen
Power off
Measured RH
above 50 %
RH below 50 %*
Measured RH
below 50 %
Measured RH
above 50 %
RH above 50 %*
Measured RH
below 50 %
Measurement OK
Fault status
Error active
Measurement live
Online status
Purge or sensor
heating active
* Hysteresis has an effect when relay switching is based on live measurement.
See section Hysteresis on page 127.
Enabling/Disabling Relays
You can deactivate the relay outputs for example for service purposes of
your system.
Setting Relay Outputs
NOTE
When you have only one relay module installed, its relays are called
“relay 1” and “relay 2”.
When you have two relay modules, the relays of the module connected
to slot MODULE 1 are called “relay 1” and “relay 2” and relays
connected to slot MODULE 2 are called “relay 3” and “relay 4”.
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