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STRUCTURE OF ION SOURCES - Thermionic sources are small (0.062 inch diameter x
0.40 inch long) ceramic cylinders composed of a loop of wire coated with layers of ceramic materials. Additives in the ceramic determine its activity. Source types are identified as TID-1, TID-2, TID-3, TID-4, TID-5,
TID-6, and CFID, according to their chemical formulations and their work functions for the emission of thermionic electrons. Also available is an FID Probe consisting of an uncoated loop of wire.
SOURCE MOUNTING CONFIGURATIONS - A standard source mounting is a hexagonal shaped stainless steel flange which fits all DET structures as well as the Agilent 6890/7890 NPD structure. Also available is a 1/4 inch tube mounting for use in other customer-designed NPDs such as those in the Thermo
Electron Trace GC and the SRI Instruments GC. Sources mounted in a round flange that fits the Finnigan/Tremetrics 9001 GC are also available.
SOURCE RECYCLING SERVICE - Depleted DET or Agilent 6890/7890 NPD ion sources can be returned for recycling with a new DET coating. Recycling provides the performance of a new source, but at a lower cost due to re-using some parts.
PRICES (hex or 1/4 tube mounts with connector):
$310 each (new), $280 each (recycled)
Designed
Uses
of the
Ion
Source Types:
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TID-1, low work function for operation in Nitrogen, Air, or Oxygen; detects electronegative compounds. |
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TID-2, moderate work function for NPD-like operation in dilute Hydrogen/Air; detects N or P compounds with minimal tailing of P peaks. |
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TID-3, moderate work function for operation in Nitrogen, Air, or Oxygen; detects volatile Halogenates. |
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TID-4, moderate work function for NPD-like operation in dilute Hydrogen/Air; provides the best N response for the NPD. |
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TID-5, high work function for operation in dilute Hydrogen/Air; selective for Br and I. |
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CFID, high work function for operation downstream of Hydrogen/Air flame; in Remote FID detector provides selectivity for Pb, Sn, P, or Si. |
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TID-6, high work function for operation in pre-mixed high flow of
Hydrogen/Air; used in PTID for selectivity and very high sensitivity for P. |
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