Robertshaw 1950-518 Thermopile

As a field-tested solution for self-powered gas control systems, the Robertshaw 1950-518 Thermopile is the industry standard for maintaining a reliable standing pilot. This 750 millivolt (mV) pilot generator features an 18-inch two-lead connection with spade terminals, allowing for seamless integration into millivolt gas valves often found in commercial fryers, wall heaters, and gas fireplaces. Constructed with a stainless steel outer jacket, this thermopile is engineered to resist heat blistering and oxidation in high-temperature environments. The internal assembly utilizes a precision combination of copper and nickel alloys to maximize electrical conductivity, while a mica washer provides essential insulation to prevent shorting against the pilot burner. Designed as a versatile replacement thermopile, the 1950-518 (also identified as TP-75) is compatible with brands like Pitco and Uni-Line, ensuring consistent voltage output to hold the main burner valve open during operation.

• Universal Compatibility: Serves as a direct replacement for Robertshaw TP-75 and various competitive two-lead models in self-powered systems.
• Durable Construction: The stainless steel jacket and robust tip design offer superior resistance to flame impingement and thermal stress.
• Efficient Conductivity: High-grade alloy construction ensures a stable 250mV to 750mV range for reliable gas valve actuation.
• Simplified Installation: Includes a threaded nut for secure mounting, maintaining a consistent 3/8-inch flame coverage on the sensor tip.

What is the difference between a thermocouple and a thermopile?
A thermocouple produces approximately 30mV to power the safety magnet, whereas a thermopile is an array of thermocouples producing up to 750mV to operate the entire millivolt gas control circuit without external electricity.

Will this work with a coaxial connection valve?
No, the 1950-518 features two-wire spade connectors. For coaxial applications, the Robertshaw 1951 (CP-2) series is required.

What should the millivolt reading be?
Under a typical load, you should see between 250mV and 350mV. An open circuit test should yield a higher output, typically closer to the 500mV to 750mV range.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.