RdF has produced foil sensors for many surface temperature measurements.
The materials used for these measurements are as follows:

Nickel is a very high resistivity material with a useful temperature measuring range from 0°C to 260°C (32°F to 500°F). It has a nominal temperature coefficient of 0.0050 Ω/Ω/°C.

Copper is a low resistivity material with a useful temperature measuring range from -200°C to 150°C (-320°F to 300°F). It is very linear because its temperature coefficient
of 0.0029 Ω/Ω/°C remains constant throughout its operating range.

Balco® is a nickel-iron alloy generally used for low cost resistance sensors. It has a nominal temperature coefficient ranging from 0.0048 to 0.0053 Ω/Ω/°C. Balco® is a
trade name of AMEX Wire Corp. Driver-Harris also makes this material under the trade name Hytemco®.

Custom Foil Heaters
Foil heaters can be fabricated to any shape and can be designed to vary the watt
density so that the heat is delivered to precise locations. Foil heaters generally use low
temperature coefficient foils. However, higher temperature coefficient materials can be
used to provide self regulation. Heaters can be designed to be non-magnetic and/or
non-inductive.

Foil heaters provide more uniform heat distribution due to their low profile and intimate contact with the surface. This also contributes to faster heating and more reliable heater performance.

Bridge Completion Networks
When a full bridge-strain gage circuit is not used, RdF’s bridge completion devices can
be incorporated to complete the measuring circuit. They are available for use with
quarter bridge (single active) and half bridge (two active) strain gage configurations
and 2 or 3 wire configurations.

Foil Compensation Devices
RdF manufactures foil compensation devices for load cell applications. The selection
of materials allows for temperature compensation, bridge balancing, gage sensitivity,
Young’s modulus compensation, as well as custom resistor compensation. These
devices are designed to fit in small, non-stressed areas of the cell and contain all
the components necessary in one flat flexible device.

Other Foil Products
Foil thermocouples Catalog No. T-F, Heat Flux Sensors Catalog HFS-A, HFS-C, and
Custom Foil Heaters Catalog No. F-HTR.

For detailed information of the products listed, variations, custom designs,
or application assistance: Please contact RdF.