Specifications

M GD-100 M anual
6109-9000 Rev 3 45
Place the negative probe on terminal position 4 and with the positive on
1, 3, 2, check the values. The readings are lower at the sensor due to
power drop in the line.
The terminals should have the values shown in the table below.
You can monitor this as foll ows:
• One-Alarm Systems: Connect a voltmeter and monitor voltage
between Pins 4 (-Ve) & 2 (+Ve) of the sensor terminal connector
block for each channel in turn (CN1, CN2 Etc.) For IR sensors,
monitor between 0V and VS.
• Two-Alarm Sy ste m s: Connect voltmeter and monitor voltage
between TP5 (0V) & TP 4 (+Ve). For IR sensors, monitor
between 0V and VS.
Table 1. Connections Correct Values
Position
Number
At the Sensor Controller
Without
Sensor
Fitted
1 Power supply 7.2V minimum
reading, unless you have
power drop reduction.
+10V +12-15V
2 one-alarm system - Sensor
standby voltage* as shown on
the calibration label on the
side of the enclosure.
two-alarm system - Typical
internal reference values,
approximately
(0=Fault) 0
+0.4V Sensor in
standby
+1.6V Low Alarm
Condition
+2.8V High
Alarm
Condition
3 Approximately 4-5V +4.8-5V +5V
4 Is the negative side of the
power supply
Negati ve Negati ve
* The voltage signal from the sensor will start high and gradually fall (in clean
air) to the SSV value shown on the calibration label. IR unit will display 0Volts
until the 2 minute warm-up has finished.