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BCM SENSOR
 

Self-Temperaure Compensation (STC) of Strain Gauges

All the strain gauges for transducer application (class-A and class-B) and the most strain gauges for stress analysis (class-B and part of class-C), are designed to possesse self-temperature compensation (STC) property and available for a variaty of spring element materials (strain gauge substrate). Besides the materials listed in the Strain Gauge Coding System, there are even more materials listed in the following Table-STC. This table listes a relation of the STC number of strain gauges versus termal expension coinfficients (æ) of the substrate materials, which the strain gauge is bonded to.

Tab. α versus STC No.

Materials α (in ppm/ºC) S.T.C. Number α (in ppm/ºF)
aluminium 2024-T4 24.7 23 13.7
aluminium 7075-T6

23.4

 23 13.0
beryllium 12.1 11 6.7
beryllium Copper 16.7 16 9.3
copper 16.8 16 9.3
glass, soda lime 9.2 9
 5.1
glass, crystal 12.9 11
 6.7
inconel 12.1 11
 6.8
iron 11.7 11
 6.5
lead 28.4 27
 16.1
magnesium 26.5 27
 14.6
monel cast iron 13.5 11
 7.5
nickel 12.7 11
 6.7
platinum 8.9 9
 4.9
selenium 26.3 27
 14.5
stainless steel 304 17.4 16
 9.7
stainless steel 310 14.7 16
 8.1
stainless steel 316 16.0 16
 8.9
stainless steel 410 10.2 11
 5.7
steel 1008 & 1018 12.1 11
 6.7
steel 4340 11.4 11
 6.3
steel 15-7PH 9.0 9
 5.1
steel 17-4PH 10.8 11
 6.1
steel 17-9PH 10.7 11
 5.9
steel 17-7PH 10.5 11
 5.8
tin 23.1 23
 13.0
titanium 8.5 9 4.7
titanium 6AI-4V 8.9 9 4.9
plexiglass 65.2 65 36.2

Remarks:

1) Listed in Strain Gauge Coding System, the STC number is only for available STC strain gauges of relating materials.

2) The value æ of a given material is recorded in ppm/ºC unit. As a reference, the corresponding value of æ in ppm/ºF unit is listed in the last column.

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