Chapter 4 ________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 91
Relay Indicating Barometer Error
Status
You can set a relay to follow the operation status of the device. By
selecting FAULT/ONLINE STATUS for output quantity a relay
changes state on the basis of the operation status as follows:
FAULT STATUS
Normal operation: relay active (C and NO outputs are closed)
Not measuring state (error state or power off): relay released (C and NC
outputs are closed).
ONLINE STATUS
Live measurement (data available): relay active (C and NO outputs are
closed)
No live data (for example: error state or adjustment mode): relay
released (C and NC outputs are closed).
below for illustrative examples of the
FAULT/ONLINE STATUS relay output modes.
NOTE
If both setpoints are specified and the "above" setpoint is lower than
the "below" setpoint, the hysteresis works in the opposite direction,
that is, the relay is released when the measured value passes the exact
value of the setpoint.