Dikakanyo tsa ho sebedisa likihleli tsa PID (Photoionization Detector)

Liqhabinello tsa PID (Photoionization Detector) li leka boemo ba gasi ka ho sebelisa lerato la ultraviolet (UV) ho etsa hore litemo tse holim'a li fetole. Li na le thuso e phahameng 'me li sebelisoa ka bophara bakeng sa ho lekola mafuta a fapanang a karohano ea khemikhale (VOCs).

Lerato la UV lenqaneng la PID le nang le matla a 9.8 eV, 10.6 eV kapa 11.7 eV. Khoisong ea matla a lerato e amana le matla a ionization (IP) a gasi eo re batlang ho lokolla. Matla a lerato a lokela ho be le matla a fetang a IP a gasi bakeng sa tlhahlobo e nepahetseng. Ka mohlala, formaldehyde (HCHO) e na le IP ea 10.87 eV. Ho lekola formaldehyde, lerato la 11.7 eV e lokeloa, hobane lerato la 10.6 eV ha la lokelle.

Mekhoa ea mahlaseli a phahameng (>90% RH) e ka etsa hore mahlaseli a thehe mothatong oa lerato la UV, e amanang le boiphihlelo ba lithokothe. Kahoo, liqhabinello tsa PID li sebelisoa ka botlalo libakeng tsa mahlaseli a sa feleng kapa li entsoe ka mabenkele a ipa molemo.

Kabelo ea lipakeng tse phahameng (mohlala, >1000 ppm) kapa VOCs tse nang le boemo ba ho fofa bo phahameng (joalo ka liyo, aldehyde, le lihydrocarbon tse nang le boemo ba ho fofa bo phahameng) e ka arabela ho koma ha li-ionized products le li-non-volatile residues (mohlala, silicone oil, H₂S) mothatong oa UV lamp. Sena se ka fokotsa ts'ebetso ea UV light transmittance, ho etsa hore sebaka sa karabo se nyekane, nako ea karabo e nyololehe, le ho fokotseha ha ts'ebetso. Kabelo e telele e ka hanana UV lamp ka mokhoa o sa feleng. Ho latela tlisano, fokotsa tšebetso, le ho ntlafatsa boleleli ba sensor, ho khethollotse ho sebelisa qalong-sampling device ha u sebetsanya le PID sensor.