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Division 5.1 Calibration intervals

Original text. Later amendments are not shown.

Table A5/3

Instrument calibration intervals

Instrument checksIntervalCriterion
Gas analyser linearization (calibration)Every 6 months± 2 per cent of reading
Mid spanEvery 6 months± 2 per cent
CO NDIR:CO2/H2O interferenceMonthly– 1 to 3 ppm
NOx converter checkMonthly> 95 per cent
CH4 cutter checkYearly98 per cent of ethane
FID CH4 responseYearlySee paragraph 5.4.3. of this Sub-Annex
FID air/fuel flowAt major maintenanceAccording to instrument manufacturer.
Laser infrared spectrometers (modulated high resolution narrow band infrared analysers): interference checkYearly or at major maintenanceAccording to instrument manufacturer.
QCLYearly or at major maintenanceAccording to instrument manufacturer.
GC methodsSee paragraph 7.2. of this Sub-AnnexSee paragraph 7.2. of this Sub-Annex
LC methodsYearly or at major maintenanceAccording to instrument manufacturer.
PhotoacousticsYearly or at major maintenanceAccording to instrument manufacturer.
Microgram balance linearityYearly or at major maintenanceSee paragraph 4.2.2.2. of this Sub-Annex
PNC (particle number counter)See paragraph 5.7.1.1. of this Sub-AnnexSee paragraph 5.7.1.3. of this Sub-Annex
VPR (volatile particle remover)See paragraph 5.7.2.1. of this Sub-AnnexSee paragraph 5.7.2. of this Sub-Annex

Table A5/4

Constant volume sampler (CVS) calibration intervals

CVSIntervalCriterion
CVS flowAfter overhaul± 2 per cent
Dilution flowYearly± 2 per cent
Temperature sensorYearly± 1 °C
Pressure sensorYearly± 0,4 kPa
Injection checkWeekly± 2 per cent

Table A5/5

Environmental data calibration intervals

ClimateIntervalCriterion
TemperatureYearly± 1 °C
Moisture dewYearly± 5 per cent RH
Ambient pressureYearly± 0,4 kPa
Cooling fanAfter overhaulAccording to paragraph 1.1.1. of this Sub-Annex