Indigo200 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.
Figure 1. Relay configuration options (CO2 probe example)
1
Relay output on/off : Set to ON to enable relay output.
2
Output parameter : The measurement that is used to control the relay. Options vary based on the type of
the connected probe.
3
Activate above : When the measurement value exceeds
the value set here, the relay activates.
See the different relay activation
options described in Figure 1 .
4
Activate below : When the measurement value falls
below the value set here, the relay activates.
See the different relay activation
options described in Figure 1 .
5
Hysteresis : Define a buffer value for relay deactivation (set the value according to the
parameter selected for the relay). With hysteresis, an activated relay switches off only
when the measured value crosses the relay activation/deactivation limit and the
additional buffer value.
6
Error output state : Select which state the relay is set to when an error occurs (on, off, or remains in
its current state).
Relay state information
Figure 2. Relay icons on display (relay A
active, relay B not active). When one or both relays are enabled, the relay state (active/not active) is shown on
the transmitter display. You can also view the status of the relays with Insight PC
software.