Photoionization detector automated zero level calibration
US10782273B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 2016 |
| Grant date | Sep 22, 2020 |
| Priority date | — |
| Expiry date | Sep 28, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2030/642
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of detecting gas with a photoionization detector (PID) system. The method includes powering on a photoionization detector, turning off an ultraviolet lamp of the photoionization detector by a controller of the PID system and keeping it turned off during the zero calibration procedure, flowing ambient air from a surrounding environment by a fan of the photoionization detector system past a detector electrode of the photoionization detector, processing an output of the detector electrode by the controller to determine a zero level of the photoionization detector, and storing the zero level in a memory of the photoionization detector system. The photoionization detector system in a detecting mode compares an output of the detector electrode to the zero level to determine if a threshold concentration of a gas is present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.