Thermo Scientific TVA2020, Instruction Manual

Page: 21 / 190

Introduction
Photoionization Detection
Thermo Fisher Scientific TVA2020 Instruction Manual 1-5
METER
SAMPLE OUT
IONIZATION CHAMBER
SAMPLE IN
UV SOURCE
LAMP
WI NDOW
COLLECTING
ELECTRODE
Figure 1–2. Typical Photoionization Detector
Benefits of Photoionization Detection:
●
High sensitivity to aromatics, unsaturated hydrocarbons and
chlorinated hydrocarbons
●
Ability to measure some inorganic gases
●
Very simple operation
●
No support gases required
●
Non-destructive detector allows sample to be recovered
Benefits of
Photoionization
Detection