Brands     Vishay Measurements Group     Interactive Guide     Tech Notes     TN-506

Bondable Resistance Temperature Sensors and Associated Circuitry

Sources of Error

Deviations from Linearity
Linearization of TG-Series sensors with passive resistance circuits characteristically leaves small deviations from true linearity. To assure optimum correction for nonlinearity of the nickel, the user may select from four temperature ranges:

 
-200° to +500° F, use LST-10F/100F-350D



-320° to +100° F, use LST-10F/100F-350C



-150° to +260° C, use LST-10C/100C-350D



-200° to +25° C, use LST-10C/100C-350C

The expansion coefficient of the structure to which the temperature sensor is bonded will affect linearity, and the deviation of TG sensors with LST-10F-350D conditioning networks on 1018 steel and 2024 aluminum alloy is shown below.



Typical deviation from linearity for TG-Series sensors mounted on 1018 steel and on 2024 aluminum alloy.

For highest accuracy it is necessary to calibrate sensor/LST systems on the material to be used. In most work, however, the average curves (shown above ) are satisfactory.

(continued...)



Page 7 of 15