## Thermistor Thermometers

The thermistor is a semi-conductor device whose resistivity (r) varies as a function of temperature (T):

• R = Ro [1 + a (T-To)] where,
• R = resistance of temp. at T
• T = temp at the end of measurement
• Ro = resistance of temp. at To
• To = temp at the beginning of measurement

Temperature resistance coefficient is the parameter that determines if the resistivity variation is positive (as with the Positive Temperature Coefficient, or PTC sensors) or negative (as with the Negative Temperature Coefficient, or NTC thermistors). It is possible to determine the temperature by applying a potential difference and measuring the resistance.

Thermistor sensors are suitable for a temperature range of -50 to 150oC (-58 to 302oF). Higher temperatures may damage the semi-conductor sensor. Accurate temperature measurements are possible (tenths of degree) due to the high sensitivity of the sensor.

### Portable Thermistor Thermometers

Below are the portable thermistor thermometers include ones made for Foodcare. Also included are version with a calibration feature that allows the user to calibrate the meter and probe in an ice bath at 0 oC.

### Testers

A variety of thermistor based testers are available. They include versions with a folding probe, reinforced handle for insertion into semi-solids, and ones that can mount on a refrigerator.

Thermistor Thermometers The thermistor is a semi-conductor device whose resistivity (r) varies as a function of temperature (T): R = Ro [1 + a (T-To)] where, R = resistance of temp.... read more »
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## Thermistor Thermometers

The thermistor is a semi-conductor device whose resistivity (r) varies as a function of temperature (T):

• R = Ro [1 + a (T-To)] where,
• R = resistance of temp. at T
• T = temp at the end of measurement
• Ro = resistance of temp. at To
• To = temp at the beginning of measurement

Temperature resistance coefficient is the parameter that determines if the resistivity variation is positive (as with the Positive Temperature Coefficient, or PTC sensors) or negative (as with the Negative Temperature Coefficient, or NTC thermistors). It is possible to determine the temperature by applying a potential difference and measuring the resistance.

Thermistor sensors are suitable for a temperature range of -50 to 150oC (-58 to 302oF). Higher temperatures may damage the semi-conductor sensor. Accurate temperature measurements are possible (tenths of degree) due to the high sensitivity of the sensor.

### Portable Thermistor Thermometers

Below are the portable thermistor thermometers include ones made for Foodcare. Also included are version with a calibration feature that allows the user to calibrate the meter and probe in an ice bath at 0 oC.

### Testers

A variety of thermistor based testers are available. They include versions with a folding probe, reinforced handle for insertion into semi-solids, and ones that can mount on a refrigerator.