Vaisala DMT340 User Manual Page 131

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Chapter 4 _________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 129
1102-007
Figure 69 Measurement-Based Relay Output Modes
Mode 4 is usually used if an alarm needs to be triggered when the
measured value exceeds a safe range. The relay is active when
measurement is in range, and is released if the value goes out of range or
the measurement fails.
NOTE
If the measurement of the selected quantity fa
ils or the transmitter loses
its power, the relay is released.
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