Dual Detectors - Thermo Scientific TVA2020 Instruction Manual

Introduction

Dual Detectors

Dual Detectors
1-6 TVA2020 Instruction Manual
The benefits of each individual detector are very clear: both the FID and
the PID have their advantages and disadvantages. However, with either
detector alone, the number of organic and inorganic vapors that one can
detect is limited by the measurement capabilities of that detector.
With the TVA2020, users can obtain more complete information about
organic and inorganic vapors more quickly and easily than with single
detector technology alone.
Since both detectors may be displayed and logged simultaneously, the
relative response of the two detectors may give some clues about the
identity of the compound being measured (see
the PID does not respond to methane at all, but the FID responds very
well. A high FID reading with virtually no PID response might indicate the
presence of methane. Consequently, PIDs respond very well to some
inorganic gases that FIDs cannot detect. A high PID reading with no FID
reading might suggest the presence of an inorganic compound. With
readings from both detectors readily available, the TVA2020 can help a
user make decisions about the type of compound present and which
detector reading to use.
Figure 1–3). For instance,
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