Customized configuration for a wide range of applications
Differing applications ask for differing configurations of an analytical system in order to meet the specific requirements. Like a construction kit, our gas chromatographs can be configured individually for any field of use.
Detector
All analyzers of the GC 4000 and the GC 5000 series can use either a Flame Ionization Detector (FID) or a Photo Ionization Detector (PID).
The Flame Ionization Detector (FID) is well known for its versatility and provides a linear signal over a wide measuring range. This robust type of detector has proven to be extremely reliable over decades of practical use. Operation of the FID requires additional supply of hydrogen and combustion air.
The Photo Ionization Detector (PID) allows for sensitive detection of aromatic hydrocarbons and other organic compounds characterized by their low ionization potential. As this type of detector does not provide a linear output signal, calibration of the PID requires additional time and effort compared to a FID.
Calibration Gas Selector
This option allows for fully automated calibration or validation of the gas chromatograph during operation. Software controlled solenoid valves will switch as selected between the sample line and two additional gas lines e.g. for zero air and calibration gas.
Stripping Column Device
This option allows the retention and backflushing of high boiling components and/or humidity in a pre-column in order to separate them from the compounds to be analyzed. This protects the analytical column and allows for short analysis cycles.
Enrichment Modules
For determination of organic compounds at extremely low concentration levels – e.g. for ambient air monitoring, purity control of industrial gases or occupational health and safety monitoring – the GC 5000 series can be provided with a single or dual stage enrichment module.
The peltier cooled single stage enrichment module allows for preconcentration of organic components using special adsorbent materials. Subsequently the sample will automatically be introduced by means of thermal desorption technique.
The dual stage enrichment module is specifically designed for determination of very volatile organic compounds. After preconcentration and subsequent release by thermal desorption, the components will be trapped in a second stage. Only now the sample will be transferred to the analytical column by rapid heating up of the focussing capillary in order to start the next analysis run.