Vaisala PTU300 Guide de l'utilisateur Page 121

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Chapter 4 ________________________________________________________________ Operation
VAISALA ______________________________________________________________________ 119
Operation of Relays
Quantity For Relay Output
A relay monitors the quantity chosen for the relay output. Any of the
quantities available can be chosen.
Measurement-Based Relay Output
Modes
Relay Setpoints
When the measured value is in between the "above" and "below" values,
the relay is passive. When choosing lower value as "above" value and
higher value as "below" value, the relay is passive when the measured
value is not between the setpoints. You can also set only one setpoint.
See Figure 59 below for illustrative examples of the different
measurement-based relay output modes.
0610-076
Figure 59 Relay Output Modes
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