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Method 25 Methane/Non-Methane GC System - SRI Instruments
Method 25 Methane/Nonmethane GC System
18
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FID Detector
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HayeSep-D Column
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10-port "Backflush" Gas Sampling Valve
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Built-in "whisper quiet" Air Compressor
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1 channel PeakSimple Data System
...on the compact
chassis
The SRI Method 25 GC system is equipped with an
,
and a
to quickly determine
methane/non-methane hydrocarbons as per EPA Method 25.
In this typical methane/non-methane
analysis, the non-methane
hydrocarbons were backflushed after
the ethane peak, but the valve timing
could have been set to backflush after
the methane, or after the C
3
, C
4
, C
5
or
C
6
hydrocarbons, depending on the
operator's needs.
The sample is connected to the valve inlet port on the GC valve oven, where it fills the 1mL sample loop on the gas
sampling valve. The valve is then automatically rotated to inject the sample onto the column, which separates the
methane (and optionally the ethane) away from the rest of the hydrocarbons. After the elution of the compound(s) of
interest, the gas sampling valve is automatically returned to the starting position, which backflushes the rest of
the hydrocarbons into the detector.
The
controls the temperature programmable column oven and the gas
sampling valve, collects the data, quantitates the non-methane hydrocarbons, and produces a printed report. The Method
25 GC comes standard with a HayeSep-D column, but may be equipped with other
as desired.