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Temperature affects are a key factor in geotechnical instrumentation and can be divided into two main categories:

Temperature change which causes real deformation or stress changes

Most materials expand and contract with temperature the amount of which is dependent on their coefficient of expansion. In extreme cases large strains especially in steel structures can occur and should be taken into consideration when analysing data from sensors.

Temperature change which affects the output of the sensor

All sensors are affected by temperature to a greater or less degree and good quality sensors should either be designed to have minimum temperature effects, have built in temperature measurement and/or have a temperature calibration. 

However it is recommended that wherever possible temperature should be measured in the vicinity of each sensor so that correction factors can be applied.