TESTO 6381 Instruction Manual page 32

4 Transmitter
Use of relay as NC contact (NC = normally closed)
Use of relay as NO contact (NO = normally open)
32
The busy light (alarm/status light) is permanently on until
the relay opens or the circuit is interrupted. This circuit can
therefore be used to monitor the functionality of the alarm
circuit, as a cable break, for instance, is indicated by the
busy light going off.
1 Alarm/status light
(example of installation)
2 250 V AC/DC, 3 A
1 Alarm/status light
(example of installation)
2 250 V AC/DC, 3 A