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OdaLog® L2 – Gas Logger User Manual
9.
CALIBRATING THE OdaLog®
OdaLog Instruments should be calibrated by authorised, competent personnel using the correct
equipment. If unsure, or the correct equipment is not available, then return the instrument to Thermo
Fisher Scientific or an authorised distributor / technical workshop for calibration.
9.1. Preparation for Calibration
Calibration of an OdaLog® must take place in a known clean, fresh air environment at an ambient
temperature of between 20°C and 25°C.
A clean, fresh-air environment is one that is free of flammable gases and interfering or contaminating
substances (hereafter known as "Clean Air").
Cigarette smoking, the use of butane lighters or solvents nearby, industrial fumes, or vehicle exhaust can
cause an incorrect, and hence potentially inaccurate, calibration.
Ensure the OdaLog® has sufficient battery life and that filters are uncontaminated and undamaged.
Ensure calibration is undertaken in a well-ventilated area or fume cupboard. Seek advice from
calibration mixture supplier in relation to handling calibration gases.
9.2. Adsorption of Calibration Mixture
Care should be taken when selecting the regulator material, tubing type, and length used for calibration.
For certain calibration mixtures, instead of the gas passing freely through the gas regulator & tubing, test
gas molecules can attach themselves to the regulator & tubing walls, thus reducing the concentration of
calibration mixture that reaches the instrument sensor. This effect is known as adsorption and is more
noticeable with certain calibration mixtures than others, particularly Hydrogen Sulphide.
Advice in relation to the suitability of regulators and tubing should be sought from the calibration mixture
supplier.
P/N: 10-1000
CAUTION
Figure 16: Clean (Well Ventilated) Air
CAUTION
Revision G, January 2024
Page | 22
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