Owner's manual

Chapter 4 _________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 127
Table 31 Relay State Examples
Criterion for
Relay Activation
Transmitter
Operation Status
NC-C
Connected
NO-C
Connected
Not chosen
Power off
T
d/f
below -10 °C*
Measured T
d/f
above -10 °C
Measured T
d/f
below -10 °C
T
d/f
above -10 °C *
Measured T
d/f
above -10 °C
Measured T
d/f
below -10 °C
Fault status
Measurement OK
Error active
Online status
Measurement live
Purge, AutoCal, or
sensor warming
active
* Hysteresis has an effect when relay switching is based on live measurement.
See section Hysteresis on page 125.
Enabling/Disabling Relays
You can deactivate the relay outputs for example for service purposes of
your system.
Indication Led Operation
Relay is activated: LED is lit
Relay is not activated: LED is not lit
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”.