Valco pulsed discharge detectors

Pulsed discharge detector

Non-radioactive

CE-compliant

Multiple mode

• Electron capture

• Helium photoionization

Winner of R&D 100 Award

Chromatograms

AOAC poster session

The VICI PDD (pulsed discharge detector) utilizes a stable, low powered, pulsed DC discharge in helium as an ionization source. Performance is equal to or better than detectors with conventional radioactive sources.

In the electron capture mode, the PDD is a selective detector for monitoring high electron affinity compounds such as freons, chlorinated pesticides, and other halogen compounds. For this type of compound, the minimum detectable quantity (MDQ) is at the femtogram (10^-15) or picogram (10^-12) level. The PDD is similar in sensitivity and response characteristics to a conventional radioactive ECD, and can be operated at temperatures up to 400°C. For operation in this mode, He and CH4 are introduced just upstream from the column exit.

In the helium photoionization mode, the PDD is a universal, non-destructive, high sensitivity detector. The response to both inorganic and organic compounds is linear over a wide range. Response to fixed gases is positive (increase in standing current), with an MDQ in the low ppb range.

The PDD in helium photoionization mode is an excellent replacement for flame ionization detectors in petrochemical or refinery environments, where the flame and use of hydrogen can be problematic. In addition, when the helium discharge gas is doped with a suitable noble gas, such as argon, krypton, or xenon (depending on the desired cutoff point), the PDD can function as a specific photoionization detector for selective determination of aliphatics, aromatics, amines, as well as other species. (Click here for an ionization potential chart in .pdf format.)

Available for 110 VAC and 230 VAC.

Models

D2 - mode-selectable
Stand alone universal detector system

D3 - helium photoionization
Plug-and-play for Agilent 6890

D4 - helium photoionization
Plug-and-play models for HP 5890, Shimadzu GC 14 and GC 17, Thermo Trace GC, and Varian 3800, plus a universal retrofit model

D5 - electron capture
Plug-and-play for Agilent 6890

D6 - electron capture
Plug-and-play models for HP 5890, Shimadzu GC 14 and GC 17, Thermo Trace GC, and Varian 3800, plus a universal retrofit model

D-3-I-HP

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download the pages with this product.

	Additional chromatograms
	1.	10 ppt SF6 in ultrapure air
	2.	30 ppb vinyl chloride in nitrogen
	3.	Haloalkanes mixture in methanol
	4.	Hydrocarbon analysis
	5.	Impurities in food grade CO 2
	6.	N2 , O2 , and CO2 in acrylic syrup
	7.	Natural gas liquid (NGL)
	8.	n-Paraffin wax standard
	9.	Pesticide analysis
	10.	Trace impurities in high purity hydrogen
	11.	Trace impurities in bulk gases
	12.	Hydrocarbon analysis (comparing FID and PDD)
	13.	Impurities in hydrocarbon feedstocks
	14.	PAH residues in soil from a Superfund site
	15.	PAH residues in an environmental soil sample spike
	16.	Herbicides in soil samples using EPA Method 8151

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