Yokogawa 212 Heat Calculator - Manual (Page 60)

For example, Relay 0 can be programmed to alarm if the flow rate is below a
certain value, while Relay 1 can be programmed to alarm if the power
consumption exceeds a preset value.
In the alarm condition the relays are closed, and are open in the non-alarm
condition or when the instrument is unpowered.
58 Input & Output Connections