Robertshaw 1951-001 Thermopile

The Robertshaw 1951-001 Thermopile is a heavy-duty, coaxial pilot generator engineered for high-performance self-powered gas control systems. Featuring a 36-inch lead length and a durable stainless steel outer jacket, this Robertshaw CP-2 thermopile is designed to withstand intense heat and resist blistering in demanding commercial and residential environments. The assembly utilizes a specialized combination of copper and nickel alloys to maximize electrical conductivity, reliably delivering an open circuit output of 500 to 750 millivolts. This millivolt gas valve sensor includes an integrated mica washer to provide superior insulation and prevent shorting under high-stress conditions.

Installation is streamlined via the attached threaded nut, ensuring a secure and vibration-resistant fit into the burner assembly. This model specifically includes the PG9 pilot adapter, making it a direct replacement thermopile for General Controls PG9 pilot burners. For field technicians, the coaxial connector nut (3/8”-32 UNEF-2) ensures a solid mechanical and electrical bond to the gas valve, maintaining system integrity and preventing nuisance drop-outs.

Key Benefits

• Universal Compatibility: Designed as a direct service replacement for Robertshaw, Uni-Line, and competitive coaxial-type self-powered systems.
• Enhanced Durability: The 36-inch stainless steel jacket provides superior protection against flame impingement and thermal cycling.
• Optimized Conductivity: Nickel-copper alloy construction ensures consistent millivolt generation for reliable valve holding.
• Precision Fit: Included PG9 adapter and threaded nut simplify retrofitting on older pilot assemblies.

Common Questions

How do I test if the thermopile is failing?
Using a multimeter set to millivolts, measure the open circuit output; it should read between 500mV and 750mV. If the reading drops significantly under load when the valve is energized, the internal resistance is likely too high, indicating a need for replacement.

What is the difference between this and a 1950 series?
The 1951 series (CP-2) utilizes a coaxial "plug-in" style connector with a threaded nut, whereas the 1950 series (TP-75) typically uses two-wire spade terminals. Always verify your valve’s input type before installation.

Why is the PG9 adapter included?
The PG9ad adapter is required specifically for legacy General Controls pilot burners. It allows the threaded 1951-001 to seat correctly at the proper height relative to the pilot flame ring.

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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.