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Bondable Resistance Temperature Sensors and Associated Circuitry

Calibration

Nickel foil lots are calibrated with specially designed test equipment consisting of a carefully controlled, uniform temperature bath, and a platinum resistance standard having calibration results traceable to the National Institute of Standards and Technology. Accuracy of calibration during these tests is 0.5° F (0.3° C). The temperature range used is -320° to +500° F (-195° to +260° C). The test data from TG sensors shows that their behavior can be described generally by a polynomial equation of the form:

 (1)

where:

= Resistance of the gage
= Temperature
through = Constants determined using regression analysis curve fitting

When the RTD's are being used to indicate temperature, the equation must be entered in the transposed form:

 (2)

Values of the constants for Eqs. (1) and (2) for 50-ohm [at +75° F (+23.9° C)] nickel TG sensors are listed in the following tables .

Notes
  1. The constants A' through G' in Eq. (2) are not the same as A through G in Eq. (1).
     
  2. Curve-fit Eqs. 1 and 2 are best-fit equations.


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