Brands
Vishay Measurements Group
Interactive Guide
Tech Notes
TN-506
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Bondable Resistance Temperature Sensors
and Associated Circuitry
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Special Sensors
In addition to the standard line of TG sensors described in Catalog 500, Micro-Measurements can furnish almost any sensor pattern desired, and a wide range of resistances. Setup charges will be minimized when the special pattern design corresponds to one of the patterns in the line of EA-Series strain gages, although resistances available are sometimes limited. Balco ® an alloy of nickel and iron with a high temperature coefficient-of-resistance and a resistivity 2.4 times that of pure nickel, can also be furnished on special order for measurement or control functions. This alloy is frequently used for temperature compensation of transducer gage circuits. Two fixed bondable Balco resistors are commonly inserted in the excitation leadwires of a transducer bridge circuit to provide automatic compensation for the combined effects of elastic modulus variation (in the transducer) and gage factor variation (in the strain gage,) with temperature. A series of adjustable, bondable resistor patterns is available, and permits trimming to the exact value of resistance required. Both resistor types are also available in nickel. While Balco has a slightly lower temperature coefficient of resistance than high-purity nickel (as shown previously ), its lower cost and higher resistivity permit smaller size and better economy. 
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