Wire-Wound and Thin Film Platinum Temperature Sensing Resistors

Labfacility offers a wide range of precision platinum temperature sensing resistors in both wire-wound and flat film construction. All standard items are available in quantity from stock; non-standard detectors can be supplied to order.

  • Precision platinum temperature sensors
  • Pt100, Pt500, Pt1000 and other values available
  • Available from stock
  • Wire-wound and flat film types
  • Wide range of sizes
  • Tolerance values include class A or B, to 1/10th of class B
  • Single or duplex detectors
  • Specials available to order including alternative Ro values and nickel resistors

Platinum wire-wound detectors comprise a pure platinum wire wound into a miniature spiral and located within axial holes in a high purity alumina rod. The freedom of movement of the platinum wire gives good long term stability and a wide operating temperature range of -200 to up to +800°C. Labfacility wire-wound detectors are cylindrical in shape and ideally suited for housing within a protective metal tube.

The construction of the wire wound platinum detector uses a large proportion of manual labour, with a high degree of training and skill. The careful selection of all components is vital, as are good working conditions. Complete compatibility between metal, ceramic and glass when used, together with the connecting leads is essential, and most important, strain must be eliminated. Various methods of detector construction are employed to meet the requirements of differing applications.

Although more expensive than flat film alternatives, wire-wound detectors have a wider temperature range (particularly below -50°C) and are readily available in close tolerance classes.

A range of alternative diameters and lengths is available. Duplex detectors containing two platinum resistors are also available.

Platinum flat-film detectors are produced by the deposition of a platinum film on to a flat ceramic substrate, the platinum being sealed to provide protection. Flat-film detectors are available in a range of sizes and are recommended for applications requiring small size, fast response to temperature changes, surface measurement, and resistance to vibration and shock. They are generally less expensive than wire-wound detectors, but the choice of tolerance classes is more limited.

Metal Film Resistors take the form of a thin (1 micron) film of platinum on a ceramic substrate. The film is laser trimmed to have a precise R° value and then encapsulated in glass for protection. A wide range of styles and dimensions are produced to allow for different applications. Such sensors have fast thermal response and their small thermal mass minimises intrusion in the media being tested. Such sensors are known variously as flat film, thin film or chip sensors. Thermoelements and resistance thermometer sensing resistors alike normally require protection from environmental conditions and, depending on the application would normally be housed in a suitable sheath material if immersion is required. Alternative housings are used for non-immersion use such as in surface or air sensing.

Labfacility are the UK’s leading manufacturer of Temperature Sensors, Thermocouple Connectors and associated Temperature Instrumentation and stockists of Thermocouple Cables.

The Company has been trading since 1971 and is ISO 9001 accredited. We have two UK sites – West Sussex and South Yorkshire and export to over 85 countries.

Quality and Service are key elements in the continued growth of Labfacility; technical support is always freely available from our experienced technical sales teams.

For all sales enquiries please contact us as follows:

Email: sales@labfacility.com       Tel: +44 (0) 1243 871280

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