Hot Wire Filaments & Thermistors About Hot Wire Filaments & Thermistors AGC Instruments is a leading supplier of Hot Wire Filaments, Thermistors and Thermal Conductivity Detectors (TCD) to leading Instrument manufacturers of Gas Chromatographs and Gas Analysers Worldwide. Pairs or Quads Hot Wire Filaments A choice of materials is available depending on the application in question. The choice includes: Gold-Sheathed Tungsten (AuW), Tungsten (W), Rhenium-Tungsten (WX), Nickel (Ni) and Nickel Alloy. Each type has specific characteristics such as corrosion resistance, oxidation resistance, catalytic reactions and sensitivity for use which are dependent on the application required. Hot Wire Filaments required for corrosive applications are best suited to be manufactured in Gold-sheathed tungsten, with special resistance to Oxygen. The Filaments are sold as matched pairs with standard 50mm (2”) leads or at lengths more suited to the customer’s requirement. AGC Instruments filaments are manufactured in matched pairs or quads. A matched pair is made up of two elements matched in gas under varying current conditions. Neither pair is matched to the other. We recommend purchasing 3 to 4 pairs to make a well balanced bridge. Quads are made up of four elements matched as in a cell. These four elements compensate for changes in current, flow and temperature. Bruker (Varian) The Thermistor is a thermally sensitive resistor that has a high negative coefficient of resistance. They are manufactured from a mixture of the oxides of Manganese, Nickel and Cobalt. They are sintered in an oxidising atmosphere in the form of small beads (0.012” dia.). A covering of glass is then placed over the bead to protect it from further oxidation and reduction. Thermo Fisher Perkin Elmer The characteristic of thermistors is such that they can be operated at relatively low operating temperatures, they have high sensitivity and are suitable for sub-ambient temperatures. Customised Hot Wire Filaments AGC Instruments can customise to a customer specific requirement. We can manufacture Hot Wire Filaments to meet your exact requirement or to best suit your needs. For more information on our customised solutions please contact us directly.

Thermal Conductivity Detectors (TCD) AGC Instruments offers our own standard range of TCD. In addition, we are able to advise and design a suitable configuration should your require non standard. Please contact AGC Instruments directly for further details. Characteristics of the Various Filament Types Substance Very Good Good Good Good Fair Poor Nitrogen Fluorine Poor in presence of H2O Poor Good Poor (Fluoride forms at 20oC) Fair Fair Fair Good Poor Good Fair Poor Fair Ordering Information Part Filaments Resistance Cold, Ohms 25oC Gold- Sheathed Tungsten Gold-Sheathed Tungsten Glass Beads Glass...