9-2
9 Pyrolyzer Module Options
Two Midas Pyrolyzer modules are available to
detect specific gases (consult the Midas data
sheets for an updated list of detectable species).
The pyrolyzer module option is installed under
the Midas gas detector. An air sample is drawn
through the pyrolyzer and the target fluorinated
compounds are converted into hydrogen
fluoride (HF) gas by means of pyrolysis at a
high temperature which is optimized for each
gas family. The residual HF is then measured
by the appropriate sensor cartridge and the
concentration is calculated from this result. This
concentration is then displayed in actual ppm on
the Midas’ LCD display.
The standard Midas pyrolyzer unit (P/N MIDAS-
T-NP1) detects nitrogen triflouride (NF
3
) and
Perfluoro compounds (CH
3
F, C
4
F
6
, C
5
F
8
, CH
2
F
2
).
The pyrolyzer unit for NF
3
, CH
3
F and CH
2
F
2
can
utilize a Freon end-of-line filter (P/N 1830-0027).
The filter is filled with charcoal to remove Freon
and other similar compounds from the sample gas
before it is “cracked” in the pyrolyzer.
Diagram 9-1 illustrates the various pyrolyzer
configurations. This table shows that gases
which can be detected by the Midas Pyrolyzer
module.
Detectable Gases
Cartridge Part No. Gas Gas ID
MIDAS-E-XHF,
MIDAS-S-XHF
NF
3
01
CH
3
F
02
MIDAS-E-XCF,
MIDAS-S-XCF
C
4
F
6
01
C
5
F
8
02
CH
2
F
2
03
Note that the pyrolyzer module is ideally suited for
leak detection rather than analytical detection of
very low trace amounts of PFC compounds.
Diagram 9-1. Midas gas detector with pyrolyzer modules (left to right: MIDAS-T-0P3, MIDAS-T-00P, MIDAS-T-HTP, and MIDAS-T-NP1).
Midas Gas Detector
Ventilated Top Cover
Midas Pyrolyzers
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