How can I extend the temperature range of a thermistor to read lower temperatures?
Most thermistors increase in resistance as the measured temperature decreases (i.e. they have a negative temperature coefficient). They tend to be quite non linear and increase in resistance rapidly as the temperature falls into the the lower part of the sensing range. The datataker DT80 range of loggers has an upper limit of 10K Ohms for resistance measurement which can limit the usable sensing range of thermistors. To overcome this you can use a parallel resistor to scale the output of the thermistor back into the measurement range of the logger. To determine the size of the resistor required you need to determine the maximum resistance that is required to be measured. This can be determined by using the following formula. \normalsize R_p=\frac{10000 \times R_{max}}{R_{max} – 10000} Where Rmax is the maximum value of the thermistor’s resistance at the lowest expected temperature. If using one of the supported YSI thermistor types then the value of Rp can be placed in the channel opti
Most thermistors increase in resistance as the measured temperature decreases (i.e. they have a negative temperature coefficient). They tend to be quite non linear and increase in resistance rapidly as the temperature falls into the the lower part of the sensing range. The datataker DT80 range of loggers has an upper limit of 10K Ohms for resistance measurement which can limit the usable sensing range of thermistors. To overcome this you can use a parallel resistor to scale the output of the thermistor back into the measurement range of the logger. To determine the size of the resistor required you need to determine the maximum resistance that is required to be measured. This can be determined by using the following formula. Where Rmax is the maximum value of the thermistor’s resistance at the lowest expected temperature. If using one of the supported YSI thermistor types then the value of Rp can be placed in the channel options for the channel directly as these types support the use o
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