INFICON HLD6000 Refrigerant Leak Detector - Manual (Page 13)

4 Description
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4 Description
4.1 Function
The HLD6000 comprises of a basic unit and a sniffer line.
The HLD6000 can, depending on the model, verify and quantify gases sucked in by the
sniffer line with the help of an infrared gas analyzer.
The key assemblies of the HLD6000 are:
 Sniffer probe with sensor assembly,
 Basic unit with pump system, electric and electronic assemblies.
A source emits infrared light in an optical cell through which the sucked-in gas flows. This
light is filtered such that only light with a certain wavelength drops onto an infrared sen-
sor.
If there is a leak and gas gets into the chamber with the sucked-in air then part of the in-
frared radiation is absorbed by the gas.
This means that the intensity of the light which meets the sensor is reduced.
The change in light intensity is electronically amplified, digitalized and then optically and
acoustically displayed by the microprocessor after evaluation.
The underground concentration of the sample gas or other interfering gases are taken
into consideration and balanced out due to a reference measurement of the ambient air.