Resistance Temperature Detectors

Thermo Sensors Resistance Temperature Detectors (RTDs)

Thermo Sensors Corporation Resistance Temperature Detectors (RTDs) are widely used across a range of industries, with particular importance in oil and gas applications where custody transfer-grade temperature accuracy is critical.

Thermo Sensors leverages advanced materials, precision manufacturing techniques, and extensive application expertise to deliver high-performance RTD solutions. Their flagship Reliatemp RTD is engineered for long-term reliability, featuring moisture-free construction and superior resistance to vibration—two key factors that directly impact sensor accuracy and lifespan in demanding environments.

In addition to robust product design, Thermo Sensors provides comprehensive support, including application guidance, technical design assistance, and detailed ordering resources to ensure proper specification and integration.

RTDs from Thermo Sensors are designed for excellent accuracy and stability. Platinum sensing elements provide near-linear output over a wide temperature range, while alternative materials such as nickel and Balco offer options for specific application requirements. Long-term stability is maintained through careful control of variables such as temperature exposure, mechanical stress, chemical interaction, and insulation integrity.

Advanced construction techniques minimize self-heating errors, particularly when operating with low measuring currents. Insulation resistance is a critical performance factor, and the Reliatemp RTD consistently exceeds 2,000 megohms at temperatures up to 100°C, ensuring signal integrity in harsh conditions.

Key Features:

• High insulation resistance achieved through densely compacted MgO and proprietary manufacturing processes (tested at 100 VDC, >2000 MΩ)
• Wide temperature range:
• Standard: -200°C to +400°C
• Optional -600 sheath: up to +660°C
• Vibration resistance through encapsulated sensing element design
• Fast response time due to moisture-free MgO compaction
• Reduced drift through optimized MgO compaction and iron-free backing powder in the RTD tip
• RTD’S fabricated per ASTM E1137
• RTD’S tested per ASTM E644 & beyond

Reliatemp RTD Specs:

• Ice Point Resistance:
  • 100 ohm ± .10 ohm
• Temperature Range: -200º TO +660ºc
• Insulation Resistance: >2000 megaohms (waterproof)
• Time Response: 2.1 seconds
• Thermal Shock: 450ºc plunged into room temperature water at 3 fps, five times
• Thermal Cycling:
  • 7.8 ohm/watt with 60 mw/1.2ºc
• Vibration: Three axes with 3 g’s acceleration (5 to 500 Hz) at room temperature
• High Temp Vibration: One axis with 20 g’s acceleration (30 to 550 Hz) at 540ºc