Pt100 vs Pt1000 RTDs: Key Differences Explained

rtd
pt100
pt1000
temperature measurement
resistance thermometer

This article explores the distinctions between Pt100 and Pt1000 Resistance Temperature Detectors (RTDs). Let’s dive in!

Introduction to RTDs

  • RTD stands for Resistance Temperature Detector.
  • RTDs have a positive temperature coefficient. This means their resistance increases as the temperature goes up.
  • For relatively low temperatures, the relationship between resistance and temperature can be approximated by the formula: R_T = R_0 * (1 + α * ΔT)
  • For higher temperatures, a different formula applies: R2 = R1 + R0 * α(t2 - t1)
    • Where α represents the resistance temperature coefficient, measured in units of /°C.
  • Both Pt100 and Pt1000 RTDs are platinum resistance thermometers, relying on the resistance of a platinum element for temperature measurement.
  • They provide excellent accuracy across a broad temperature range.
  • Both are considered PTC (Positive Temperature Coefficient) type resistance thermometers.
  • They are typically manufactured using thin-film technology.

Pt100 RTD

  • The Pt100 RTD utilizes a platinum wire, carefully wrapped around a ceramic core.
  • It shows a linear increase in resistance as temperature rises.
  • At 0°C, the Pt100 offers a resistance of 100 Ohms.
  • At 100°C, its resistance is about 138.4 Ohms.
  • The sensitivity of a Pt100 is 0.391 Ohms per °C.

Pt1000 RTD

  • Similar to the Pt100, the Pt1000 RTD also uses a platinum wire wrapped around a ceramic core.
  • It also exhibits a linear relationship between resistance and temperature.
  • The key difference is that Pt1000 offers resistance values that are ten times higher than those of a Pt100.
  • The sensitivity of a Pt1000 is 3.91 Ohms per °C.

Key Differences Summarized

FeaturePt100 RTDPt1000 RTD
Resistance at 0°C100 Ohms1000 Ohms
Sensitivity0.391 Ω/°C3.91 Ω/°C
Resistance at 100°C~138.4 Ohms~1384 Ohms

For further reading, you might find it useful to explore the differences between RTDs and thermocouples:

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