M&C TechGroup KS 2.Ex Operator's manual - Manual (Page 11)

11
Gas sampling and conditioning technology 5-5.3 ME
9.3 CONNECTION OF THE SENSOR TYPE KS2.EX TO THE ELECTRONICS WE77/EX1
N O T E !
The bridge between the connecting points 3 and 4 of the electronics
WE77/Ex1 guarantees a „safty-first“ alarm release (alarm in case of voltage
loss and parting of the cable).
The function is as follows:
dry sensor : LED
„ON“ contact MC-NO terminal 7 and 9 closed Sensor current > 1,7 mA
wet sensor : LED „OFF“ contact MC-NC terminal 7 and 8 closed Sensor current < 1,4 mA
Brigde between connecting points 4 and 5 or missing bridge
N O T E !
If the bridge is missing or switched between the connecting points 4 and 5 of
the electronics WE77/Ex1 the alarm is not working in a „safty-first“ mode (no
alarm in case of voltage loss).
The sensor current is on a very low level. Therefore we recommend to switch a resistance of 10k

parallel to the sensor to increase the level.
The function than is as follows:
dry sensor :
LED „OFF“ contact MC-NC terminal 7 and 8 closed Sensor current > 1,7 mA
wet sensor :
LED „ON“ contact MC-NO terminal 7 and 9 closed Sensor current < 1,4 mA
9.4 CONNECTION OF THE SENSOR TYPE KS2.EX TO THE ELECTRONICS
KFA6-SR2-EX1.W
Move all switches (S1-S3) on the front into position I (left).
The function is as follows:
dry sensor : left
LED „OFF“ contact MC-NC terminal 7 and 8 closed Sensor current > 1,7 mA
wet sensor : left
LED „ON“ contact MC-NO terminal 7 and 9 closed Sensor current < 1,4 mA