5.6 Adjustment facilities
5.6.1
The gas analytical system shall have adjustment facilities that provide readings for zero-setting, CGM and internal adjustment. The facilities may be manual, semi-automatic or automatic.
5.6.2
The internal adjustment shall neither affect the zero set, nor the instrument’s linearity and it shall not be connected with the CGM adjustment. The approach should be such that each time a calibration gas mixture is applied to the input of the gas analyser, the adjustment facilities will enable the readings to be brought into conformity with the value of the volume fraction of the component to be determined in the CGM.
5.6.3
The adjustment facility for zero-setting shall give negative indications near zero for certain tests or manual adjustment, if necessary.
5.6.4
The automatic adjustment facilities shall display or print out the results of all internal adjustments: flow rate (its deceleration), internal reference adjustment, calibration and leak immediately after switching on and then during operation with the periodicity specified by the operator.