Sensors & Thermistors
Every sensors & thermistors calculator on CalcEngines — unit converters, derived indices and interpretive tools, each with its formula, a worked example and the reference intervals it is judged against.
6 calculators in this section
- 4–20 mA Loop CalculatorConvert between loop current and engineering units either way, with the sense-resistor voltage, the ADC counts your resolution gives, and a loop budget that says plainly whether your supply can actually drive the resistance you have put in the loop.
- Load Cell CalculatorWhat a load cell gives you and what a converter can do with it: the output voltage at any load from the rated capacity, the rated output in mV/V and the excitation, the amplifier gain that fills an ADC's range, the smallest weight one count represents, and the far smaller number of divisions the noise actually leaves you with.
- NTC Thermistor CalculatorResistance from temperature or temperature from resistance, with the Beta model or Steinhart–Hart coefficients — then the voltage divider around it: output voltage, ADC reading, sensitivity, and a fixed resistor chosen for the range you need to measure.
- PT100 / PT1000 RTD CalculatorTemperature to resistance and resistance back to temperature for a platinum RTD, using the Callendar–Van Dusen equation of IEC 60751 — with the class AA/A/B/C tolerance at your reading, the self-heating error from your excitation current, and what two-wire leads cost you.
- Strain Gauge CalculatorWhat a bonded strain gauge actually gives you: the resistance change for a strain, the Wheatstone bridge output in mV/V and in millivolts, for quarter, half and full bridges with the real multipliers rather than the rounded ones, the bridge nonlinearity the tables leave out, the amplifier gain to fill an ADC, and what the lead wires and the temperature are doing to all of it.
- Thermocouple Calculator (Type K Voltage and Temperature)Both directions on the NIST ITS-90 reference functions — temperature to millivolts and millivolts back to temperature — for type K, J and T, with the exponential term above 0 °C that most pages leave out, and with cold-junction compensation as a first-class input rather than an afterthought. It is the step that ruins more thermocouple builds than any other, and it works on voltages, not on temperatures.