عضویت 
ورود اعضا
راهنمای خرید
Model 4450 Tandem PID/FID Photoionization/Flame Ionization Detectors Specification Sheet0 pages
GC DETECTORS
Model 4450 Tandem PID/FID
Photoionization/Flame Ionization
Detectors
Description
The sample stream passes directly from the 4430 PID
exhaust port into the 4410 FID jet. The analytes are
combusted in a hydrogen-air ame. The ionized combustion
products pass through a negatively biased annular electrode,
producing an ion current proportional to the sample
concentration in the ame.
The Model 4450 Tandem PID/FID is a patented
combination detector incorporating the Model 4430
Photoionization and Model 4410 Flame Ionization
Detectors. The two detectors in tandem produce
simultaneous chromatograms for aromatics and aliphatics,
eliminating the need for two separate analyses. Since
the Tandem PID/FID occupies only one detector port,
two 4450s can be installed on one GC, providing twice
the throughput using an OI Analytical dual channel
electrometer. The Tandem PID/FID can be used with either
packed or capillary columns.
Tandem PID/FID Capabilities
Operating Principle
The sample stream elutes from the GC column into the
4430 PID’s reaction chamber where it is continuously
irradiated with high-energy ultraviolet light. Compounds
with a ionization potential lower than that of the irradiation
energy (10.2 electron volts with a standard lamp) become
ionized. An electronic eld collects the ions formed,
producing an ion current that is amplied and output by the
GC’s electrometer. The PID is a non-destructive detector,
and the compounds retain their structural and elemental
characteristics.
•
Patented tandem design uses only one GC
detector port
•
Tandem design acquires two simultaneous
chromatograms from a single injection
•
Eliminating transfer lines between detectors
improves peak shape and performance
•
System uses GC electronics or OI Analytical’s
dual channel electrometer
•
ISO 15009 and 15680
•
Standard Methods 6200C
•
Underground storage tank monitoring
Principal Applications
•
USEPA Methods (602, 604, 609, 8015, 8030,
8060, and 8090)
•
BTEX
•
GRO/DRO
•
Massachusetts VPH
"
