GAS GC-IMS, User Manual

Page: 27 / 214

GC-IMS
– User Manual
27/214
5.3 Principle setup and internal gasflow
The schematic drawing shows the principle structure of the gas flow system of the GC-
IMS is shown. The system consists of the IMS coupled to a gas chromatographic
column.
Figure 6: GC-IMS device plan (exemplary)
The drift gas for the IMS is supplied using an electronic pressure control unit
(EPC1). The carrier gas for the column is supplied using a second electronic
pressure control unit (EPC2). Both gases (carrier and drift gas) leave the device at
the gas out, which should be connected to an exhaust system.
INFORMATION!
To ensure correct measurements it is absolutely necessary to
connect the supplied exhaust tubes
(Gas out and Sample gas
out).
The exhaust tubes (Gas out and Sample gas out)
must be led
separately into the exhaust system and must not be
connected.
The exhaust system must
not generate any negative pressure
.
IMS (T1), GC-Column (T2), 6-Port Valve with sample loop (T3) and Transferline (T5
are heated.