Thermistor calculator

Thermistor Calculator V1. The component is adaptable to most NTC thermistors. Beta Value Calculator - The approximate relationship between the resistance and temperature for a NTC thermistor.

The name derives from two other words, thermal resistor. The temperature coefficient of a thermistor is used when calculating the tolerance of a thermistor in terms of temperature.

To use it you need a browser that supports Java applets. Uncategorized thermistor calculator spreadsheet. Download the archives for C or Java here. EPCOS NTC thermistors. Steinhart-Hart coefficients for an NTC thermistor whose characteristics is given as T-R table.

This component optimizes calculation speed (approx. 15x faster) by using log function approximation. Toggle navigation Förskolan Solglimten. Let’s consider the following divider bridge.

The high side is a resistor and the low side is a thermistor. The marked value of the thermistor can be out by as much as ±. The Zip File contains both OpenOffice and MS Works spreadsheets. Two versions of each type are available. Most thermistor linearization approaches involves adding parallel or series resistors. I will use a thermistor with a series resistor configured as a voltage divider (see Figure 3).

This is the simplest linearization circuit that I can think of. Useful for Arduino and other microcontroller projects using thermistors. Laser Diode and TEC Controllers by Stanford Research Systems Inc Please input resistance-temperature pairs: (Dont use the Enter key).

If Rpair is known, based on the calculation of the voltage divider, you can deduce the resistance of the thermistor (Rth). If 25°C (77°F) is in the neighbourhood of your two input temperatures - you can use the prediction to test the accuracy of the colour code markings. My thermistor was suppose to have a resistance of 4kat 25°C. Automatically compute the temperature lookup table corresponding to a specific thermistor. This calculator is designed to help calculate missing resistor values (R4) for balanced bridges (V b = 0).

The calculator can also provide you with the voltage across the bridge (V b), if you provide the resistor values (R R R R4) and input voltage (V in). They are suitable for temperature measurement, control and compensation for use over a range of -112°F to 302°F (–80°C to 150°C) with interchangeability down to ±0.

Figure - Flattened thermistor response in divider network. This is very different from the drastic nonlinear behavior you see in Figure 1. The voltage divider has a saturating characteristic that responds less as thermistor resistance grows. How does this work? The Beta value is used in a simple model of thermistor resistance. RTD and thermocouple curves have been standardized.

A standard NTC thermistor usually exhibits a negative thermal resistance temperature coefficient of about 0. To make a thermistor , two or more semiconductor powders made of metallic oxides are mixed with a binder to form a slurry. Small drops of this slurry are formed over the lead wires. The data were collected at around room temperature on a frictional shearing experiment.

I was given the circuit below, but have not worked with this configuration in the past. That is all I know. Calculation of Temperature from the thermistor resistance.

Heat is generated by the applied voltage and current, and the resistance changes with the change of temperature.