PT100 Thermistor Temperature Sensor is a high-precision temperature sensor based on the temperature dependent characteristics of platinum (Pt) resistance, named after its resistance value of 100 Ω at 0 ℃ (PT stands for Platinum). As a core component in the field of industrial temperature measurement, PT100 is widely used in temperature measurement scenarios ranging from -200 ℃ to+850 ℃ due to its high stability, good linearity, and strong anti-interference ability. It is a standard temperature sensing element in process industries, laboratories, and precision equipment.
Product Introduction
1、 Product Overview
PT100 Thermistor Temperature Sensor is a high-precision temperature sensor based on the temperature dependent characteristics of platinum (Pt) resistance, named after its resistance value of 100 Ω at 0 ℃ (PT stands for Platinum). As a core component in the field of industrial temperature measurement, PT100 is widely used in temperature measurement scenarios ranging from -200 ℃ to+850 ℃ due to its high stability, good linearity, and strong anti-interference ability. It is a standard temperature sensing element in process industries, laboratories, and precision equipment.
2、 Working principle
PT100 belongs to the category of Resistance Temperature Detector (RTD), and its working principle is different from that of a thermocouple (based on thermoelectric effect):
Resistance temperature relationship: The resistance of platinum resistors increases approximately linearly with temperature, following the division table specified in the international standard IEC 60751.
Mathematical formula:
·0℃~850℃：R(t)=R0(1+At+Bt2)R(t)=R0(1+At+Bt2)
·-200℃~0℃：R(t)=R0[1+At+Bt2+C(t−100℃)t3]R(t)=R0[1+At+Bt2+C(t−100℃)t3]
Among them, R0=100 Ω R0=100 Ω, A/B/C are the characteristic constants of platinum material.
3、 Core parameters and performance
Parameter technical indicators
Temperature measurement range -200 ℃~+850 ℃ (conventional model)
Accuracy Class A (± 0.15 ℃ @ 0 ℃)/Class B (± 0.3 ℃ @ 0 ℃)
Thermal response time<10 seconds (depending on probe structure and medium flow rate)
Wire system types: 2-wire system (economical), 3-wire system (commonly used), 4-wire system (high-precision)
Protection level IP65/IP67 (armored type can reach IP68)
Long term stability<0.1 ℃/year (typical value)
4、 Product Structure
The PT100 Thermistor Temperature Sensor consists of the following components:
Temperature sensing element: made of high-purity platinum wire winding or thin film process, encapsulated in ceramic or glass substrate.
Protective sleeve: Material options include stainless steel (304/316), Hastelloy, etc., which are corrosion-resistant and resistant to high pressure.
Lead type: High temperature resistant wire (such as silver plated copper wire, nickel wire) or mineral insulated cable (MI Cable).
Junction box: explosion-proof, waterproof or ordinary type, suitable for different installation environments.
Common structural forms:
Armored type: encapsulated with flexible metal sheath, excellent seismic performance, suitable for small spaces.
Prefabricated: Split design, easy to replace temperature sensing components.
5、 Application Fields
Industrial process control: temperature monitoring of chemical reaction vessels, petroleum pipelines, and metallurgical furnaces.
Laboratory precision measurement: constant temperature chamber, environmental testing chamber, scientific research instruments.
Energy and Power: Boiler temperature monitoring, transformer winding temperature measurement.
Food and medicine: sterilization equipment, cold chain transportation, bioreactors.
6、 Product advantages
High precision and repeatability: superior to thermocouples, suitable for precision measurements at ± 0.1 ℃ level.
Wide temperature range: covering -200 ℃ to+850 ℃, meeting most industrial needs.
Strong anti-interference ability: Resistance signal output is less affected by electromagnetic interference.
Standardized design: Complies with international/national standards such as IEC 60751 and GB/T 30121.
7、 Selection Guide
When selecting PT100, the following parameters should be specified:
Temperature measurement range and accuracy: Choose Class A/B according to actual needs.
Installation method: Threaded fixation (M8 × 1, G1/2, etc.), flange installation or direct insertion.
Environmental requirements: Hastelloy casing should be selected for corrosive media; Heat dissipation sleeves need to be installed in high-pressure environments.
Output signal matching: The 3-wire system can eliminate lead resistance errors, while the 4-wire system is suitable for laboratory level measurements.
8、 Installation and maintenance
Installation points:
Ensure that the temperature sensing area is in full contact with the measured medium, and the insertion depth is ≥ 15 times the diameter of the protective tube.
Avoid wire breakage caused by mechanical stress or vibration.
Maintenance suggestions:
Regular calibration (recommended cycle of 12 months).
Clean the surface scaling of the probe and check the oxidation status of the wiring terminals.
9、 Precautions
PT100 needs to be used in conjunction with specialized transmitters or instruments and cannot be directly connected to ordinary voltage input devices.
Avoid using in environments with strong magnetic fields or sudden temperature changes.
It is recommended to use S-type thermocouples when the temperature exceeds 850 ℃.
Through the above characteristics, PT100 Thermistor Temperature Sensor has become an indispensable temperature sensing solution in the field of industrial automation. For further technical specifications or customized services, please contact our engineering team.
