Thermistors0 pages

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.

Thermistors

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.

Our Customers Include:
•t

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.

•t

Thermo Fisher

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Dani

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Perkin Elmer

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Siemens

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Emerson

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.

•t

Orthodyne

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Perichrom

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Konik

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.

Gas Chromatography since 1965