5.1 Construction
5.1.1
All components of the gas handling system shall be made of corrosion resistant material. The materials used shall not influence the composition of the gas sample.
5.1.2
The means for sampling and sample preparation during extractive sampling shall provide for representative sampling and shall comply with ISO 10396:2007.
5.1.3
The gas handling system shall contain a switching system to allow the zero gas, gas calibration mixtures, and gas sample to be analyzed to flow into the analyzer.
5.1.4
A dehydrating charcoal filter or equivalent system shall be used when ambient air is supplied as a zero gas.
5.1.5
The pump conveying the gas sample shall be mounted so that its vibrations do not affect the measurement result. It shall be possible for the user to turn the pump on and off separately from the other components of the gas analytical system; however, it shall not be possible to make a measurement when the pump is switched off.
5.1.6
The gas handling system shall be equipped with a gas flow meter, by which the user can check the measuring mode specified by the manufacturer of the gas analytical system.
5.1.7
The gas handling system shall be air-tight.
5.1.8
The gas analytical system may be equipped with an interface permitting it to be coupled to any peripheral devices or other instruments, e.g. facilities for measuring the characteristics of the flow gas in a pipe or gas duct.
5.1.9
The interface and peripherals coupled to it shall not affect the metrological characteristics of the gas analytical system or the measurement data obtained.