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2.2. Flammable gases detector (DEX CAN transmitter)
To perform a correct calibration of a flammable gases detector you need :
1. A calibration gas cylinder (concentration between 1/3 and 2/3 of measuring range);
2. A pressure reducer with flowmeter;
3. An injection nozzle;
4. A Teflon or polyurethane flexible hose (Ø 7mm);
5. A voltmeter;
6. A measurement plug (pitch = 2.54mm);
7. An insulated flat screwdriver (width 3.5mm).
To get the injection nozzle or the measurement plug please contact Dalemans.
For applying gas to the detector, the flexible hose has to be plugged at one end to the cylinder flowmeter, and at
the other end to the injection nozzle. The injection nozzle must be fitted in the detection head opening (
Flowmeter
Cylinder
Figure 6 : Calibration gas
Depending on the type of installation, the DEX CAN transmitter is located in the detector junction box (Figure
9) or inside the OctoBUS 64 central unit (Figure 10).
Detection head
Figure 9 : DEX CAN detector
To perform calibration always proceed in the following order :
1. Set the operating voltage of the cell;
2. Set the zero of DEX CAN (Zeroing);
3. Adjust sensibility of DEX CAN (Gain).
Can Bus Gas Detectors -
C lib ti
Man-CanDetectors-Cal-En-V10.doc
Hose
Pitch 2.54mm
Figure 7 : Measurement plug
DEX CAN
Transmitter
Injection
nozzle
Hose
Figure 8 : Applying gas to the detector
OctoBUS 64 central unit
DEX CAN Transmitter
Figure 10 : DEX CAN transmitter with remote detector
Figure 8
).
Detection
head
Remote detector
4
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