INFICON 3000 Micro GC Gas Analyzer Operating Manual - Manual (Page 94)

5 - 20
PN
07
4-
51
9-
P1
C
3000 Micro GC Operating Manual
5.1.6.2 Heated Vaporizer
The Heated Vaporizer (PN G2819A-X/G2846A-X/G2858A-X) is used for high
pressure liquefied petroleum gas (LPG). This sample enters a pressure regulator
in the vaporizer where it expands, reducing the pressure to 52 ±17 kPa
(7.5 ±2.5 PSI). The sample is introduced into the injector through the transfer line
at a flow rate of approximately 40 mL/min. To prevent sample condensation, the
vaporizer temperature is regulated at 100 ±5°C.
This accessory is optimized for analyzing relatively clean and dry C
3
and C
4
sample streams. The sample must be completely vaporous at 100°C and
52 ±17 kPa (7.5 ±2.5 PSI). Although a two micron particle filter is provided to
remove particulates that could lodge in the injector and damage the instrument,
using very dirty samples should be avoided.
NOTE: Samples with excessive water content will exhibit large water peaks.
Several analytes detectable with the Heated Vaporizer and 3000 Micro GC are
shown in
Table 5-7 .
Table 5-7 Selected target analytes and comments
Target Analyte Comments
C
1
(methane) N/A
C
2
(ethane) N/A
C
3
(propane, propene) Optimized for detecting C
3
and C
4
streams
C
4
, IC
4
(butane, isobutane, butene) Optimized for detecting C
3
and C
4
streams
C
5
, IC
5
(pentane, isopentane) Detectable in trace amounts in propane, provided
that the concentration is low enough that the
C
5
/IC
5
is completely vaporous in the sample. In
larger concentrations, C
5
/IC
5
condenses in the
instrument and in the low pressure vent line.
C
6
, IC
6
(hexane, isohexane) Detectable in trace amounts in propane, provided
that the concentration is low enough that the
C
6
/IC
6
is completely vaporous in the sample. In
larger concentrations, C
6
/IC
6
condenses in the
instrument and in the low pressure vent line.