Humidity and temperature effects on torque transducers, bridge calibration unit and amplifiers

• DMP40 showed a linear trend line with increasing humidity or temperature.
• General equation developed to predict the effect of humidity/temperature on DMP40.
• Stability of BN100A under humidity and/or temperature change is verified.
• Symmetric effect of increase and decrease humidity on zero signal of torque device.
• We model time–difference curve for humidity effect on zero signal of torque device.

This paper presents a study of the effect of relative humidity and temperature on the DMP40 measuring amplifier and the BN100A bridge calibration unit. Furthermore, the effect of relative humidity on the zero signal of torque transducers is studied here. The results show that the DMP40 has a linear trend line with increasing relative humidity/temperature and also with an increase in the input voltage ratio. The developed equation is presented to predict the effect of relative humidity/temperature change on the DMP40 at any input voltage ratio by testing the DMP40 at both upper and lower relative humidity/temperatures for three input voltage ratios only. The stability of BN100A under relative humidity/temperature change is verified. The results show the symmetry of humidification and dehumidification effects on the zero signal of the torque transducer and there is good agreement between the developed characteristic equation using two exponential terms and the experimental results.