Choosing the right PT100 temperature sensor hinges on a comprehensive evaluation of core parameters such as measurement range, accuracy class, installation method, response time, and environmental adaptability, based on the specific application scenario. This ensures accurate, stable, and cost-effective measurements.
In industrial automation, energy management, medical equipment, and new energy fields, the PT100 has become a mainstream temperature sensing element due to its high accuracy and stability. However, with diverse models and operating conditions, blind selection may lead to measurement errors, shortened lifespan, or wasted costs. The following is a systematic selection guide to help you accurately match your needs.
I. Clarify Core Parameter Requirements
Measurement Temperature Range
Standard Type: -200℃ ~ +420℃, suitable for most industrial scenarios
High Temperature Type: Up to 800℃ or even 1100℃ (special design), used in furnaces, reactors, etc.
Low Temperature Type: Down to -270℃, suitable for extreme environments such as liquid nitrogen and superconducting experiments.
Recommendation: Leave a margin when selecting to avoid the sensor operating at its extreme limits for extended periods.
Accuracy Class (Class A vs. Class B)
|
Class |
Permissible Error Formula |
Applicable Scenarios |
||
|
Class A |
±(0.15 + 0.002 |
t |
)℃ |
Laboratory, Medical Equipment, Semiconductor |
|
Class B |
±(0.30 + 0.005 |
t |
)℃ |
Industrial Sites, Food Processing, HVAC |
Recommendation: For applications with stringent temperature control requirements (such as battery thermal management), prioritize Class A.
Response Time (τ₉₀)
Thin-film PT100: Response time as low as 0.5 seconds, suitable for rapidly changing temperature processes (such as filling machines).
Armored probe type: Slower response (approximately 10 seconds), suitable for steady-state monitoring (such as warehouse temperature control).
Recommendation: Choose the fast-response type for dynamic temperature measurement; requirements can be relaxed for static monitoring to reduce costs.
II. Matching Installation Methods and Structural Forms
|
Installation Method |
Representative Model |
Applicable Scenarios |
|
Threaded Mount |
WZP-230 / WZP-231 |
Pipeline and equipment surface, good sealing |
|
Flange Mount |
WZP-330 / WZP-430 |
High-pressure vessels and reactors, easy to disassemble and maintain |
|
Surface Mount |
Thin Film/SMD Encapsulation |
Temperature measurement on the surface of motors, circuit boards, and bearings |
|
Immersion Mount |
Armored Type (CY105L) |
Liquid storage tanks and pipeline interiors, used with protective sleeves |
Recommendation: For space constraints or quick installation, choose spring clips or surface mount types; for frequent disassembly, threaded or flange structures are recommended.
III. Environmental Adaptability and Protection Design
Protection Rating (IP)
Humid and dusty environments: IP65 or higher
Underwater or washing scenarios: IP68 waterproof type required
Corrosion Resistance and Mechanical Strength
Chemical environments: PTFE insulation or 316L stainless steel sheath
High-vibration equipment (e.g., fans, pumps): Armored structure for strong impact resistance
Electromagnetic Interference Resistance
When frequency converters and motors are present in the industrial site, three-wire or four-wire connection is recommended, along with shielded cables.
IV. Wiring Method Selection: Balancing Accuracy and Cost
|
Wiring Method |
Features |
Applicable Scenarios |
|
Two-wire |
Simple structure, low cost, but lead resistance affects measurement accuracy |
Suitable for short distances and low-precision applications. |
|
Three-wire |
Can compensate for lead resistance errors |
mainstream industrial solution. Suitable for most automation systems (e.g., PLC connection). |
|
Four-wire |
Highest accuracy, completely eliminates the influence of lead resistance |
Suitable for laboratories and high-precision measurements. |
Recommendation: Three-wire systems are commonly used in industrial settings to achieve the best balance between accuracy and cost.
V. Selection Strategies for Special Applications
New Energy Vehicle Battery Management: Use Class A thin-film PT100; small size, fast response, installed at hot spots in the battery module.
Use a heat shield to reduce thermal bridging and improve measurement accuracy.
Medical Equipment (e.g., dialysis machines, incubators):
Requires high accuracy (±0.1℃), medical-grade certification; Class A thin-film encapsulation is recommended.
Food Cold Chain Transportation:
Select Class B probe-type PT100; IP68 protection, withstands temperatures from -30℃ to 50℃.
Research Low-Temperature Experiments:
Wire-wound Class A PT100, glass encapsulation, good long-term stability, suitable for ultra-low temperature environments down to -270℃.
