Figure 60, Relay output modes – Vaisala PTU300 User Manual

Page 135

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Chapter 4 _________________________________________________________________ Operation

VAISALA _______________________________________________________________________ 133

1102-007

Figure 60

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 fails or the transmitter loses
its power, the relay is released.