Main features of the PT100 temperature probe
Release Date:
2021-11-04
Author:
If you need to measure and control temperatures between 70 K and 500 K, PT100 platinum resistance thermometers are an excellent choice. Within this temperature range, they offer outstanding repeatability and nearly constant sensitivity. Within the permissible error margin (1 degree), PT100 temperature probe It can also be applied in magnetic field and radiation environments.
Plutonium‑based resistance thermometers with a range exceeding 70 K share a common standard calibration curve, and their interchangeability is excellent. The thin‑film plutonium resistance thermometers offered by PT100 temperature probe manufacturers are compact, feature short response times, and are suitable for a wide range of applications.
PT100 temperature probe Feature
Materials with a magnetic moment greater than 40K are less affected by magnetic fields.
It is almost unaffected by ionizing radiation.
Provides two-point, three-point, or multi-point calibration.
PT100 Temperature Probe Parameters
Temperature range: 14 K ~ 873 K
Standard curve: IEC 751
Recommended excitation current: 1 mA
Dissipated power under recommended excitation: 100 W at 273 K
Sensitivity: Follows the standard sensitivity curve of PT100.
Response time: 1.5 s at 77 K, 10 s at 273 K
Radiation resistance: Can be used in radiation environments.
Magnetic field effects: It is recommended not to use the device in magnetic fields below 40 K.
Repeatability: 10 µm @ 77 K (verified through 100 thermal shock cycles from 300 K to 77 K)
PT100 temperature probe Reasons for using the three-wire connection method:
The PT100 temperature probe has a resistance of 100 Ω at 0 °C, with a temperature coefficient of resistance of 0.3851 Ω/°C. Due to its low resistance and high sensitivity, measurement errors caused by lead‑wire resistance can be eliminated as follows.
In a PT100 temperature probe, all three lead wires have the same cross-sectional area and length (i.e., r1 = r2 = r3). The circuit used to measure the platinum resistance is typically an unbalanced bridge: one lead (R1) is connected to the power supply of the bridge, while the other two leads (R2 and R3) are connected to the bridge arm containing the platinum resistor and to the adjacent bridge arm resistor, respectively.
Circuit diagram:
If R1X(RX R2 r3)=R2X(Rpt100 R2 R1)
Bridge balanced, U = 0.
PT100 temperature probe When there is a change, the bridge becomes unbalanced, U0.
Resistance Temperature Detectors (RTDs) – When the temperature rises, the resistance increases, a characteristic known as a positive temperature coefficient; when the temperature falls, the resistance decreases, a phenomenon referred to as a negative temperature coefficient. Most RTDs are made of platinum (Pt), which is acid-resistant, chemically stable, and exhibits nearly linear behavior, making it widely adopted in the industry.
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