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Temperature Measurement

1. The Basics
Temperature measurement uses two key devices:

  • Sensors (detect temperature)

  • Transmitters (send temperature data)

2. Temperature Sensors
These “feel” heat and create electrical signals:

By how they measure:

  • Touch sensors (must contact what they measure)

  • No-touch sensors (measure from a distance)

By how they work:

  • Thermocouples (good for very hot/cold temperatures)

  • RTDs (give very precise measurements)

3. Temperature Transmitters
These take the sensor’s signal and make it easy to send:

Common signal types:

  • 4-20mA (most common in factories)

  • 0-5V/0-10V (simple voltage signals)

  • Digital signals (for modern systems)

How it works:

  1. Sensor detects temperature

  2. Transmitter cleans up the signal

  3. Transmitter sends easy-to-use standard signal

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