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Chapter 4 ________________________________________________________________ Operation
VAISALA ______________________________________________________________________ 121
ONLINE STATUS
Live measurement (data available): relay active (C and NO outputs are
closed)
No live data (for example: error state, chemical purge or adjustment
mode): relay released (C and NC outputs are closed)
See Figure 60 below for illustrative examples of the FAULT/ONLINE
STATUSrelay output modes.
0610-077
Figure 60 FAULT/ONLINE STATUS Relay Output Modes
FAULT/ONLINE STATUS relays are usually used in conjunction with
an analog output to obtain validity information for the output value.
NOTE
If transmitter loses its power, all status-based relays are released
similarly to the case of an instrument failure.
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