PHOTOIONIZATION DETECTOR AUTOMATED ZERO LEVEL CALIBRATION

A method of detecting gas with a photoionization detector, PID, system (1, 100), comprising: determining and storing, by a controller (2, 102), a zero level of a photoionization detector (4, 104, 106, 108, 112, 116), using ambient air flowed from surrounding environment past a detector electrode (10...

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Bibliographic Details
Main Authors XIE, Guangli, WU, Zhanghua, GONG, Yaofu, CHEN, Bo
Format Patent
LanguageEnglish
French
German
Published 17.07.2024
Subjects
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
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Summary:A method of detecting gas with a photoionization detector, PID, system (1, 100), comprising: determining and storing, by a controller (2, 102), a zero level of a photoionization detector (4, 104, 106, 108, 112, 116), using ambient air flowed from surrounding environment past a detector electrode (108) of the photoionization detector (4, 104, 106, 108, 112, 116), wherein the stored zero level is based on an ambient temperature; sensing the ambient temperature; adapting the stored zero level algorithmically based on a change sensed in the ambient temperature; sampling, by the controller (2, 102), an output of the detector electrode (108) of the photoionization detector (4, 104, 106, 108, 112, 116) when an ultraviolet lamp (106) is in a turned ON state; and comparing the sampled output of the detector electrode (108) to the stored zero level to determine if a threshold concentration of a gas is present.
Bibliography:Application Number: EP20210153809