This is the defining standard for exhaust monitoring equipment accuracy, performance and functionality across Europe. All MOT Test Station analyser must meet this standard.

The critical parameters are as follows:

These measurements must be correct for a range of ambient temperatures, humidities and atmospheric pressures.

Please note that NOx measurements are currently not within the scope of the OIML criteria.

Other aspects of the standard include:

• EMC emissions and immunity

• Response time

• Low flow indication

• Display character height

• Battery life and low warning

• Filtration and condensate handling

• Hydrocarbon hang-up testing

• Automatic re-calibration

• Labelling

• Lambda calculation

• Vibration testing