PT100 vs PT1000 Temperature Sensor: Differences and Selection Guide

I.Core Parameter Differences Between PT100 and PT1000 Temperature Sensors

Resistance Variation

PT100 has a resistance of 100Ω at 0°C, whereas PT1000 has a resistance of 1000Ω at 0°C. This tenfold difference in resistance results in significant variations in signal transmission, line loss, and applicable use cases.

Signal Transmission Distance

• PT100: Suitable for long-distance wiring. It is less affected by line resistance and ensures stable, distortion-free signal transmission in remote temperature measurement applications.
• PT1000: More suitable for short-distance installations. The signal is more prone to attenuation, which can lead to significant measurement errors over long wiring distances.

Anti-Interference Performance

• PT100: With lower impedance, it offers strong resistance to power grid fluctuations and electromagnetic interference, ensuring high stability in high-voltage environments.
• PT1000: Due to higher impedance, it is more susceptible to electromagnetic interference and performs better in clean, low-noise, weak-current environments.

II. Selection Guide for Oil-Immersed Transformers (Key Focus)

Large and Medium Oil-Immersed Transformers

PT100 temperature sensors are preferred for large and medium oil-immersed transformers. With long wiring distances and complex high-voltage magnetic fields, PT100 sensors ensure accurate monitoring of oil temperature and winding temperature, making them the standard choice in power transformer applications.

Small Box-Type Transformers

Both PT100 and PT1000 temperature sensors can be used for short-distance temperature detection in compact transformer systems.

Key Considerations for On-Site Selection

For high-temperature oil environments, select high-temperature-resistant PT100 probes. Sealed and waterproof probe designs are recommended to prevent oil ingress and corrosion, thereby reducing maintenance frequency and improving operational reliability.

III.Application Scenarios of PT100 and PT1000 Temperature Sensors Across Industries

PT100 Main Applications

Power grids, oil-immersed transformers, energy storage systems, photovoltaic (PV) and wind power generation, industrial boilers, and long-distance pipeline temperature measurement.

PT100 sensors are ideal for high-voltage and long-distance wiring projects, offering easy replacement and reliable availability.

PT1000 Main Applications

HVAC systems, precision instruments, smart home devices, small motors, and short-distance temperature measurement in low-voltage control systems.

PT1000 sensors feature low power consumption and are well-suited for civil and light industrial control equipment.

IV. Maintenance and Routine Upkeep of Temperature Sensors

Regular Calibration

Temperature accuracy should be calibrated periodically. High oil temperatures may cause measurement drift; calibration every 6–12 months is recommended.

Inspection of Probe Sealing and Wiring Terminals

Oil leakage or aging wiring can lead to abnormal measurements and may trigger transformer protection or shutdown. Regular inspection is essential.

Proper Wiring Methods

PT100 sensors typically use a 3-wire configuration to reduce line resistance effects, while PT1000 sensors commonly use a 2-wire configuration for short distances. Incorrect wiring can result in significant measurement errors.

V. Summary for Distributors and Our Competitive Advantages

PT100 Recommendation

PT100 temperature sensors are the preferred choice for transformers, power grid infrastructure, and renewable energy projects, with strong market demand and high repurchase rates.

PT1000 Supplementary Role

PT1000 sensors are well-suited for HVAC systems and small-scale equipment, helping expand and diversify your product portfolio.

Our Supply Advantages

We offer a full range of PT100 and PT1000 temperature sensors in stock, with customization options for oil-immersed transformers. Our products feature extended warranties and low after-sales risk, supporting stable and long-term profitability for our partners.