Working Principle
The Corrosion-resistant RTD operates based on the principle of resistance change with temperature. Resistance Temperature Detectors (RTDs) are made from materials that exhibit a predictable and repeatable change in resistance with temperature, typically platinum.
When the temperature increases, the electrical resistance of the RTD element (such as platinum) also increases. This change in resistance is measured and converted into a temperature reading, providing accurate, stable, and linear temperature data.
The corrosion-resistant design ensures the sensor can function in harsh, aggressive environments where typical RTDs might degrade or fail due to corrosion or chemical attack.
Applications
Corrosion-resistant RTDs are commonly used in industries where temperature measurements need to be taken in environments exposed to corrosive chemicals, acids, or alkalines. They are essential in applications like:
- Chemical processing plants (e.g., reactors, distillation columns, and crystallizers)
- Petrochemical and oil refineries (e.g., tank farms, pipelines, and heat exchangers)
- Wastewater treatment (monitoring temperature in tanks and piping systems)
- Food and beverage production (ensuring food safety and quality control in corrosive environments)
- Pharmaceutical production (highly controlled environments requiring precise temperature monitoring)
- Pulp and paper industries (for monitoring temperature in corrosive chemical processes)
Construction & Materials
- Sheath Materials
- 316L Stainless Steel – Excellent corrosion resistance in many acidic and alkaline environments
- Inconel – Ideal for high-temperature and corrosive applications
- Tantalum – Suitable for extremely aggressive environments (e.g., strong acids and high-pressure systems)
- Hastelloy – For applications with strong acids or in aerospace industries
- RTD Element
- Platinum (Pt) is most commonly used due to its highly stable and linear resistance-temperature characteristics.
- Available in class A or class B tolerance grades for different accuracy requirements.
- Insulation
- Mineral Insulated (MI) cables ensure superior electrical insulation while providing protection against physical damage and heat.
- High-temperature insulators such as ceramic or glass-fiber can also be used, depending on the application.
- Connection Head / Terminal Block
- Typically made from aluminum or stainless steel, featuring flameproof or explosion-proof housings, especially when used in hazardous environments.
- Mounting Types
- Flanged, threaded, or welded designs to fit various installation requirements.
- Custom lengths and diameter options to suit different tank sizes, pipelines, or equipment.
Technical Features & Benefits
- Superior corrosion resistance ensures reliability in chemically aggressive environments.
- High accuracy with a wide temperature range (typically from -200°C to +850°C).
- Long-term stability and low drift, providing reliable and consistent temperature measurements over time.
- Durable construction that resists mechanical wear, pressure, and vibration.
- Customizable designs to meet the specific needs of diverse industries and applications.
- Easy installation with universal connection options compatible with most control systems.