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Temperature

01

MEASURING PRINCIPLE

Thermocouple

Two dissimilar metals joined at a junction generate a voltage related to the temperature difference to the cold junction.

PRINCIPLE · LIVE SIGNAL13.9mA
Thermocouple: how it works | INSTRAVAPRIN01

02

HOW IT WORKS

See the principle in action

Move the slider to change the process variable and watch the signal respond.

Thermocouple
Thermocouple: how it works | INSTRAVACOLDJUNCTION22.66 mVSEEBECK VOLTAGE ∝ ΔT
HOT JUNCTION
550 °C
OUTPUT
12.0 mA
  1. Two dissimilar metals are joined at the measuring junction.
  2. A temperature difference creates a small voltage (the Seebeck effect).
  3. The transmitter adds cold-junction compensation and converts to temperature.

03

AT A GLANCE

Strengths and limits

STRENGTHS

Wide range to above 1,000 °C, fast and rugged

LIMITS

Lower accuracy, needs cold-junction compensation

05

APPLICATIONS

Where this principle is the answer

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07

FAQ

Common questions

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RFQ

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