Industrial Scientific OLDHAM 300 Series, Operating And Maintenance Manual

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If a detector does not react upon contact with gas, it must be calibrated. Calibration frequency
should be adapted based on test results. However, it should not be greater than one year.
Industrial Scientific recommends using a test gas to calibrate detectors.
The site manager is responsible for implementing the safety procedures on his site. Industrial
Scientific is not responsible for implementing safety procedures.
The CEX 300
To reach a SIL Capability 1 level according to European standard EN50402, (requirement relative
to the functional safety of fixed gas-detection systems), the maintenance period for explosive-gas
detectors must be no more than six months. In SIL2 level installations, the maintenance period must
be at most three months.
These recommendations are compliant with the standards and directives for safety in industrial
sites. Nevertheless, Industrial Scientific – Oldham shall not be held responsible for safety
procedures put into effect on a site.
1.
Calibration
1.1. Recommendations
Calibration consists of adjusting the zero of the clean air sensor and adjusting sensitivity with a test
gas. Adjustments are made at the sensor level or on the control unit (as for CEX 300).
To adjust settings (ZERO and SENSITIVITY) on the control unit, refer to the notice displayed
therein.
Equipment needed to calibrate the detector correctly:
- flexible plastic tubing (Ref. 1)
- man regulator valve for the compressed gas tanks (Ref. 2 – Fig. 8)
- 0 to 601/h flow meter (if the tank is not equipped with one).
- calibration pipe (Fig. 8 – Ref. 3), which may vary depending on the nature of the gas (see
Annex)
- one tank of test gas (Ref. 4)
Ref. 1
Ref. 2
Ref. 3
Ref. 4
Fig. 8