Varian 450-GC, User Manual

Page: 129 / 205

Detectors
Varian, Inc. User Manual 450-GC Page: 279
DETECTORS
INTRODUCTION
The 450-GC can accommodate up to three installed detectors and have all
three running simultaneously.
The standard detectors available on the 450-GC are:
•
The Flame Ionization Detector (FID), on page 283.
•
The Pulsed Discharge Helium Ionization Detector (PDHID), on page 295.
•
Thermionic Specific Detector (TSD), on page 305.
•
Thermal Conductivity Detector (TCD), on page 319.
•
Electron Capture Detector (ECD), on page 329.
•
Pulsed Flame Photometric Detector (PFPD), on page 343.
Except for the TCD and PFPD any combination of three detectors can be
installed.
In case of the PFPD, only two may be installed but any one additional detector
may also be installed including a TCD.
In the case of the standard TCD, only two can be installed and then no
additional detectors can be installed.
However, a dual TCD option is available as a custom solution which allows
installation of an additional ionization detector.
The dual TCD consists of 2 detector cells in one housing but using only one
heating zone.
Detectors are mounted on the top of the 450-GC, above the left side of the
column oven.
The position of the detector, however, is determined by the location of the
detector’s electrometer in the electronics cabinet. Detector electrometers are
installed on the left side of the GC accessed by removing the left side panel.
All cables connecting the electrometers to the detectors are accessible by
removing the 2 covers on the top left of the 450-GC, i.e. the detector top cover
and the cover over the keyboard/display.
For connecting a capillary column to a detector, see Connect Capillary Column
to Detector on page 24.