Sensors: How it works

The selection of the right sensor determines the accuracy of the measurement result. However, there is no sensor which can do everything equally well:

  • A wide measuring range as a rule means a limited accuracy.
  • Especially fast probes are usually unsuitable for tough day-to-day measurements.
  • The design decides which probe is optimally suitable for which measurement task.

Thermocouple sensors

  • Electrical voltage measuring point / cold junction.
  • Measurement value cold junction is converted to 0 °C
  • Sufficient acclimatization time must be taken into account.

Platinum resistance sensors

  • Measurement principle: Thermistor effect of metals.
  • Correlation between the temperature and electr. resistance.
  • Comparative value 0 °C at 100 Ohm resitance due to wound platinum wire.

NTC / thermistor sensors

  • Mixed oxide ceramic sensors.
  • Negative Temperature Coefficient: NTC.
  • Without cold junction compensation – ideal for refrigerated and deep-freeze rooms.