Sensor_Step_Response_time_constant_response

Calculation of sensor stabilization time for climatic temperature measurements with heated humidity sensors
Copyright© 2019 BARANI DESIGN Technologies s.r.o.			Author: Jan Barani
The difference between sensor response time and sensor time constant τ (tau) 63.2% article.
CALCULATOR INPUTS			Author is the designer of the helical solar radiation shield for precision atmospheric air temperature measurement. Lessons learned during its development include the effects of sensor and shield response time on measurement error as demonstrated in this calculator.
Sensor Heater Max Temperature (°C) =		Sensor response rate is usually given as τ (tau) 63.2 %. It is a physical property of each sensor.
Temperature sensor time constant τ 63.2% (seconds) =
Atmospheric Air Temperature (°C) =		You can change the rate of air temperature change with these parameters to see the effect air temperature change has on sensor error and radiation shield error.



Sensor Cooling Time (sec) =		Time scale of plot
Heated humidity sensors have their advantages in high humidity environments, yet the heating affect on errors in air temperature measurements is underestimated. This calculator will allow you to calculated how long it takes for each sensor to return to accuracy after heating has ended.
τ pronounced "tau" is usually given in seconds and is defined as the amount of time it takes for a sensor to respond to a rapid change in a measurand (air temperature). This time constant is very important for measurement of temperature, dew point temperature, humidity and air pressure. Radiosondes are especially affected due to their rapid increase in altitude. NOTE: Many manufacturers quote sensor response time an air speeds higher than are seen in the field. Sensor response time constant is lower at higher air speeds.



Elapsed Time (seconds)	Ambient Air Temperature (°C)	Sensor Temperature Reading (°C)	Temperature Sensor error (°C)
AVERAGE (Mean Error) =
Maximum Error =
Minimum Error =

0 sec