Resistance Thermometer
Product Overview
A Resistance Thermometer (RTD) is a high-accuracy temperature sensor that measures temperature by correlating the resistance of a metal element—typically platinum—with temperature. RTDs are widely used in industrial and laboratory applications where precision, stability, and repeatability are essential.
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How it works (simple explanation)
An RTD contains a metal element whose electrical resistance increases as temperature rises.
The instrument measures this resistance change and converts it into an accurate temperature value using standardized resistance-temperature relationships (such as IEC 60751 for Pt100 sensors).
What it measures
- Temperature of liquids
- Temperature of gases
- Temperature of solids or surfaces
Key advantages
- High accuracy and repeatability
- Excellent long-term stability
- Wide operating temperature range
- Standardized characteristics (Pt100, Pt1000)
- Good resistance to electrical noise compared to thermocouples
Applications
- Process industries (oil & gas, chemical, petrochemical)
- Power plants and energy systems
- Food & beverage processing
- Pharmaceutical manufacturing
- HVAC systems
- Machinery and equipment temperature monitoring
Installation
- Installed directly into the process using a thermowell or threaded connection
- Can be mounted in pipelines, tanks, ducts, or machinery
- Available in 2-wire, 3-wire, or 4-wire configurations for different accuracy requirements
- Proper immersion length is important for accurate temperature measurement
Technical Specifications
Parameter | Specification |
Sensor Type | Pt100 / Pt1000 |
Measurement Range | −200 °C to +600 °C (typical) |
Accuracy Class | Class A, Class B (IEC 60751) |
Output Signal | Resistance (Ω) |
Wiring Configuration | 2-wire / 3-wire / 4-wire |
Response Time | Fast to moderate (depends on sheath) |
Sheath Material | Stainless Steel (SS304 / SS316) |
Process Connection | Threaded, flanged, or thermowell |
Protection Class | IP65 / IP67 (with suitable head) |
Operating Pressure | Depends on probe design and thermowell |