AT-G-DETECT
Gas Sensing System
LEAK DETECTION SOLUTIONS
8
M. DOUBLE CHECK CONNECTIONS ARE CORRECT
To make sure the gas detectors are wired up correctly you can check the voltages at the sensor
cable terminal blocks on the controller PCB or sensor PCB using a 0-10V voltmeter as outlined
below in Table 1.
Place the negative probe on terminal position 4 and with the positive on1, 3, 2, check the Volts
values. The readings are lower at the sensor due to power drop in the line.
The terminals should have the under listed values:
Position
Number
At the sensor
Controller
Without sensor
fi
tted
4
Is the negative side of the power supply
Negative
Negative
1
Power Supply 7.2V minimum, unless you
have power drop reduction
+10V
+12 – 15V
3
Approximately 4-5V
+4.8 – 5V
+5V
2
One level system – sensor standby
voltage* as shown on the calibration
label on the side of the enclosure.
Two level system – typical internal
reference values, approximately
(0=Fault)
+0.4V
+1.6V
+2.8V
0
Sensor in standby
Low Alarm Condition
High Alarm Condition
* The voltage signal from the sensor will on power up start high and gradually fall (in clean air)
to the SSV value shown on the calibration label.
You can monitor this as follows:
1 level 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.)
2 level systems: Connect voltmeter and monitor voltage between TP5 (0V) & TP4 (+Ve).
Important:
All information, including illustrations, is believed to be reliable. Users, however,
should independently evaluate the suitability of each product for their application. Aquilar
Limited makes no warranty as to the accuracy or completeness of the information, and
disclaims any liability regarding its use. The only obligations of Aquilar Limited are those in
the Aquilar Standard Terms and Conditions of Sale for this product, and in no case will Aquilar
Limited be liable for any incidental, indirect, or consequential damages arising from the sale,
resale, use or misuse of the product. Speci
fi
cations are subject to change without notice. In
addition, Aquilar Limited reserves the right to make changes – without noti
fi
cation to Buyer
– to processing or materials that do not a
ff
ect compliance with any applicable speci
fi
cation.
AquiTron
is a trademark of
AquiTron Limited
Aquilar
is a trademark of
Aquilar Limited
V
2
04
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9
Unit 30, Lawson Hunt Industrial Park,
Broadbridge Heath, Horsham, West Sussex,
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+44 (0) 1403 216100
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