RTD Temperature Sensor Series
Assembled Thermal Resistance (RTD)
Industrial-grade Pt100 assembled RTD temperature sensors for precise measurement from -200°C to 500°C. Available in no-fixed, threaded, flanged, and taper-thread mounting configurations with IEC 60751 Class A/B accuracy. Spring-loaded sensing elements deliver excellent vibration resistance for demanding process environments.
Product Overview
The Assembled Thermal Resistance (RTD) is a robust industrial temperature sensor designed for direct measurement of liquid, steam, gas, and solid surface temperatures ranging from -200°C to 500°C. It operates on the principle that the electrical resistance of metals changes predictably with temperature — when the temperature of the sensing element changes, its resistance changes proportionally, allowing the connected instrument to display the corresponding temperature value.
Built with imported platinum thin-film Pt100 sensing elements and spring-loaded internal construction, these assembled RTDs provide exceptional anti-vibration performance and long-term measurement stability. The spring-loaded design maintains consistent contact pressure between the sensing element and the protective tube, ensuring accurate readings even under mechanical shock and vibration conditions commonly found in industrial process environments.
Manufactured in compliance with IEC 60751, GB/T 30121-2013, and JB/T 8623-1997 standards, these RTDs are available in five mounting configurations: no-fixed device, fixed screw thread, active-flange, fixed-flange, and taper thread cone type. Platinum (Pt100) and copper (Cu50/Cu100) sensing elements are available, with accuracy classes from AA to C. The 1Cr18Ni9Ti stainless steel protective tube provides excellent corrosion resistance and mechanical strength, making them suitable for a wide range of industrial applications.
Technical Specifications
| Parameter | Specification |
|---|---|
| Sensor Element | Pt100 (Platinum) / Cu50, Cu100 (Copper) |
| Temperature Range (Pt100) | Class A: -30~300°C | Class B: -50~500°C |
| Temperature Range (Cu50/Cu100) | -50~100°C |
| Accuracy Class | AA, A, B, C (per IEC 60751) |
| Standards Compliance | IEC 60751, GB/T 30121-2013, JB/T 8623-1997 |
| Response Time | <24s (G-type variable cross-section) | <90s (standard) |
| Protective Tube Material | 1Cr18Ni9Ti Stainless Steel |
| Tube Diameter | Φ12mm, Φ15mm, Φ16mm |
| Insertion Length | 300~2150mm (customizable) |
| Process Connection | M27×2, G3/4, M33×2, NPT1, Flange (Φ95/Φ65/Φ46) |
| Protection Grade | IP65 (anti-spray type) / IP55 (waterproof type) |
| Junction Box | Anti-spray (code 2) / Waterproof (code 3) |
| Wire Configuration | 2-wire, 3-wire, 4-wire |
| Nominal Pressure | ≤4.0 MPa (screw/flange) | ≤15 MPa (taper thread) |
Pt100 Tolerance Classes & Temperature Ranges
| Tolerance Class | Wire Wound Element (°C) | Membrane Element (°C) | Tolerance Formula (°C) |
|---|---|---|---|
| AA | -50 ~ 250 | 0 ~ 150 | ±(0.1 + 0.0017|t|) |
| A | -100 ~ 450 | -30 ~ 300 | ±(0.15 + 0.002|t|) |
| B | -196 ~ 600 | -50 ~ 500 | ±(0.3 + 0.005|t|) |
| C | -196 ~ 600 | -50 ~ 600 | ±(0.6 + 0.01|t|) |
|t| = absolute value of temperature in °C. Tolerance per IEC 60751.
Key Features
Spring-Loaded Anti-Vibration Design
Temperature-sensing element is spring-loaded inside the protective tube, maintaining consistent contact pressure and providing excellent vibration resistance for harsh industrial environments.
No Compensation Wire Required
Unlike thermocouples, RTD sensors do not require expensive compensation wires. This significantly reduces installation costs while maintaining measurement integrity across long cable runs.
High Accuracy Pt100 Element
Imported platinum thin-film Pt100 sensing elements deliver Class A accuracy of ±(0.15 + 0.002|t|)°C with excellent long-term stability. Available up to Class AA for precision applications.
High Mechanical Strength
1Cr18Ni9Ti stainless steel protective tube withstands pressures up to 15 MPa (taper thread type) with excellent corrosion resistance, suitable for aggressive process media.
5 Mounting Configurations
Choose from no-fixed device, fixed screw thread (M27×2, G3/4), active-flange, fixed-flange (Φ95), and taper thread (M33×2, NPT1) to match your exact installation requirements.
Fast Response Option (<24s)
G-type models with variable cross-section design achieve response times under 24 seconds — nearly 4× faster than standard models — enabling tighter process control loops.
Mounting Types & Model Selection
| Mounting Type | Model Series | Connection | Tube Φ (mm) | Max Pressure |
|---|---|---|---|---|
| No-Fixed Device | WZP-120/121/130/131 | Direct insertion | 12, 16 | — |
| Fixed Screw Thread | WZP-220/221/230/231 | M27×2 / G3/4 | 12, 16 | ≤4.0 MPa |
| Active-Flange | WZP-320/321/330/331 | Movable flange | 12, 16 | — |
| Fixed-Flange | WZP-420/421/430/431 | Flange Φ95/Φ65/Φ46 | 12, 16 | ≤4.0 MPa |
| Taper Thread Cone | WZP-620/630 | M33×2 / NPT1 | 15 | ≤15 MPa |
Models ending in 0/1: single element. Models with suffix “2”: dual element. Suffix “G”: fast-response variable cross-section. IP65 for x20/x21 (anti-spray); IP55 for x30/x31 (waterproof).
Applications
Chemical Processing
Monitor reactor temperatures, pipeline media, and heat exchanger performance. Fixed-flange models (WZP-4xx) with IP65 protection handle aggressive chemical environments at pressures up to 4.0 MPa.
Power Generation
Measure bearing temperatures, cooling water, and exhaust systems in power plants. The taper-thread models (WZP-6xx) withstand pressures up to 15 MPa for high-pressure steam applications.
HVAC & Building Automation
Track supply/return water temperatures, air duct conditions, and chiller performance. No-fixed models (WZP-1xx) allow flexible placement, while Class A accuracy ensures precise climate control.
Food & Pharmaceutical
Monitor pasteurization, sterilization, and cold-chain storage temperatures. The stainless steel construction and waterproof IP55 junction box meet hygiene requirements for clean process areas.
Oil & Gas Processing
Measure wellhead, pipeline, and refinery process temperatures. Fixed screw thread models (WZP-2xx) provide secure installation in pressurized pipelines with easy maintenance access.
Laboratory & R&D
Precision temperature measurement for test benches, environmental chambers, and research instruments. Class AA accuracy of ±(0.1 + 0.0017|t|)°C meets demanding calibration requirements.