GC Chemical Detection by DET

THERMIONIC Surface Ionisation (TID)
and Flame Ionisation (FID) Products

DETECTORS for GAS CHROMATOGRAPHY - hardware designed to custom fit onto the existing FID or NPD base on various GC models (e.g., Agilent 6890, HP 5890, Varian 3800, SRI 8610)
CERAMIC ION SOURCES (Beads) for the NPD (Nitrogen-Phosphorus Detector) and other TID (Thermionic Ionization Detector) MODES, including REPLACEMENTS for the AGILENT 6890 NP ION SOURCE
STAND-ALONE TRANSDUCERS and DETECTION MODULES
click image to expand

Outstanding Features

• Multiple modes of detection (NPD, PTID, TID-1, TID-3, TID-5, FTID, FID, Remote FID, Tandem TID)

• Unique selective responses to heteroatom compounds (Nitrogen, Phosphorus, Oxygenates, Halogenates, Nitro-compounds, Lead, Tin, Silicon)

• inexpensive, easy to operate equipment (most modes do not require high purity detector gases)
  
  DET Applications Library

ELECTRONICS - Electrical heating and polarization voltages for the thermionic sources/FID probe are provided by a DETECTOR CURRENT SUPPLY featuring thumbwheel setting of 0 to 4.000 Amps Constant Current type heating power, and switch selectable -5, -15, and -45 V polarization.
A combined CURRENT SUPPLY/ELECTROMETER provides both source power and negative ion signal measurement. A CURRENT SUPPLY/ELECTROMETER/READOUT option provides digital readout of the signal.
On some GC instruments (Agilent 6890, Varian 3800, Finnigan/Tremetrics 9001) the existing NPD electronics can be used to power Ion Sources in the NPD mode and measure signals from all modes.

STAND-ALONE TRANSDUCERS and DETECTION MODULES - Transducers are TID or NPD or FID hardware assemblies fitted with Tube or Swage-type inlet fittings to allow easy attachment to standard gas line connections.
Detection Modules include these transducers in a thermally insulated box containing a temperature controller and pneumatics controls where required.
TFID (Thermionic/Flame Ionization Detector) module can be configured as a self-contained, stand-alone FID, NPD, or TID unit operated in conjunction with a CURRENT SUPPLY/ELECTROMETER as above.
RTIA (Reactor Thermionic Ionization Analyzer) module includes a heated reactor chamber as the inlet for a TID-1 or NPD transducer.

Some examples of DET equipment uses:

• Replacement sources for the Agilent 6890 NPD - TID-2
  (black ceramic for sharp P peaks) or TID-4 (white ceramic for best N-response), $245 ea. new or $215 ea. recycled

• Agilent 6890 NPD with more stable Constant Current type ion source heating power
  - substitute DET Current Supply ($1500) for the 6890 Bead Voltage (Constant Voltage type) - other modes of thermionic detection also accessible with this equipment change.

• Adapt Agilent 6890 NPD to selective detection of Oxygenates or volatile Halogenates
  - use DET Current Supply as above and replace NP ion source with TID-1 or TID-3 ($245 ea.)

• DET NPD retrofit for HP 5890 GC - DET Remote FID tower ($1400), TID-2 or TID-4 source ($245), and Current Supply/Electrometer ($2500) - this hardware/electronics easily adapts to other TID, Remote FID, or FTID modes..

• Replace Varian TSD with DET NPD for lower cost ion sources and much improved P-peak shapes
  - DET TID/FID tower ($1200), TID-2 or TID-4 source ($245), and use compatible Varian TSD electronics

• Adapt Varian TSD to other TID or FID modes by adding a DET Current Supply and appropriate Ion Source type to the above DET TID/FID equipment.

Ion Sources  

 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 NPD structure. Also available is a 1/4 inch tube mounting for use in other customer- designed NPDs such as those in the ThermoFinnigan 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 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): ( considersably less than Varian / Agilent not so good equivalents )

Designed Uses of the Ion Source Types:

• TID-1, low work function for operation in Nitrogen, Air, or Oxygen; detects electronegative compounds.

• TID-2, moderate work function for NPD-like operation in dilute Hydrogen/Air; detects N or P compounds with minimal tailing of P peaks.

• TID-3, moderate work function for operation in Nitrogen, Air, or Oxygen; detects volatile Halogenates.

• TID-4, moderate work function for NPD-like operation in dilute Hydrogen/Air;  provides the best N response for the NPD.

• TID-5, high work function for operation in dilute Hydrogen/Air; selective for Br and I.

• CFID, high work function for operation downstream of Hydrogen/Air flame; in Remote FID detector provides selectivity for Pb, Sn, P, or Si.

• 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.

GC Equipment - Single & Tandem Detectors

HARDWARE - Compact detector towers made of stainless steel and ceramic mount onto the existing FID or NPD base on the GC, and use the GC's existing controls for setting detector temperature and gas flows.
The Ion Sources/FID Probe are on a self-aligning flange which fits the top of the tower.
Tower types are identified by the nomenclatures: TID/FID which positions the thermionic source near a flame jet structure;
REMOTE FID and FTID which position the source several centimeters downstream of the jet; and TANDEM TID / TID and TID / FID which combine two detectors in series.

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