Vaisala Indigo 202, User Manual

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6. Configuring Relays
6.1 Relay Configuration Overview
Indigo transmitters have 2 configurable relays (relay A and relay B). Both relays have
configuration options for selecting the parameter that is used to control the relay, activation
triggers, hysteresis, and error state behavior.
1
2
3
4
4
5
Figure 19 Relay Configuration Options (CO
2
Probe Example)
1 Output Mode: Select whether the relay activates above or below a set value (or set the
relay Off ).
2 Parameter: The measurement that is used to control the relay.
3 Unit: Select the unit of the measurement parameter that controls the relay (for example,
% if the measurement is in %CO
2
).
4 Low Trigger Level and High Trigger Level: If you want to activate the relay above or
below a single setpoint without using hysteresis, enter the same value for the low
trigger and the high trigger. The
Output Mode selection defines whether the relay
activates above or below this value.
If you want to set a hysteresis, define the limits of the hysteresis with the low and high
triggers.
5 Error State: Select which state the relay is set to when an error occurs (on, off, or
remains in its current state)
Chapter 6 – Configuring Relays
41