Instrumentation
For over 30 years, VICI has provided the analytical instrument industry with a variety of analytical tools. Many of those tools are valves and
fittings, the remainder, presented in this section, are leading technology tools primarily for gas detection and purification. From R&D 100 Award-winning pulsed discharge detectors to our application-dedicated trace gas analysers, you'll find we're far morte than just a valve company. |
VICI INSTRUMENTATION
Catalog Section . . . 242-251 | - Pulsed Discharge Detectors 242-247
- Hydrogen and oxygen removal systems 250
- Microvolume Thermal Conductivity Detector 250
- Helium and nitrogen purifiers 251
- Gas Calibration Devices
DynaCalibrators
|
Microvolume Thermal Conductivity Detector u-TCD
 250 |
Microvolume Thermal Conductivity Detector micro-TCD
The VICI-Valco dual filament TCD is a stand-alone unit consisting of the detector housing and a controller with electrometer and temperature controls. The detector cell includes two separate nickel/iron filaments, capable of independent or referenced (differential) operation. Cell volume and geometry are optimized for capillary chromatography and enhanced sensitivity at low flow rates.
(Recommended total flow rate: 2-10 mL/min.) Thermal stability is maintained to ±0.02°C, resulting in a stable, noise-free signal. A single 0-1 millivolt attenuated output for a strip chart recorder is provided through the signal cable at the rear of the controller, with 0-1 volt and 0-10 volt unattenuated signals available through the remote signal cable.
Available for 110 VAC or 230 VAC. |
Pulse Discharge Detector | Non-radioactive
CE-compliant
Multiple mode
• Electron capture
• Helium photoionization
Winner
of R&D 100 AwardChromatograms, AOAC poster session CO2 ppB Impurity analysis
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.
|
PDD 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
|
PDD 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 |
- page served
