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2. GAS DETECTOR CALIBRATION
For gas detectors, calibration consists in placing the sensor cell of the detector in an atmosphere made up of air
and calibration gas.
According to the surrounding atmosphere conditions, applying pure air (zero gas) to the sensor cell may be
necessary.
2.1. Toxic gases & oxygen detector (DTX CAN)
To perform a correct calibration of the DTX CAN detector you need :
1. A zero gas cylinder (pure air or Nitrogen);
2. A calibration gas cylinder (concentration between 1/3 and 2/3 of measuring range);
3. A pressure reducer with flowmeter;
4. An injection cap (Figure 4);
5. A Teflon or polyurethane flexible hose (Ø 7mm);
6. An insulated flat screwdriver (width 1mm).
In order to avoid ambient air or air currents from corrupting the calibration atmosphere around the cell always use
the suitable injection cap. Just place it instead of the metal detection head cap and fix its position by mean of the
fastening screw (Figure 4
To apply zero gas or calibration gas, fix one end of the flexible hose to the cylinder by mean of the flowmeter. Fix
the other end to the injection nozzle.
Cylinder
Figure 3 : Zero gas or calibration gas cylinder
To perform calibration always proceed in the following order :
•
Set the zero of DTX CAN (Zeroing);
•
Adjust sensibility of DTX CAN (Gain).
Can Bus Gas Detectors -
C lib ti
Man-CanDetectors-Cal-En-V10.doc
). To get the injection cap please contact Dalemans.
Flowmeter
Hose Ø7mm
(Teflon or PU)
Fastening screw
Injection cap
Injection nozzle
Figure 4 : Injection cap for DTX CAN
2
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