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Copper thermocouple with stainless steel probe 48 in long

Robertshaw

Robertshaw 1970-048 Thermocouple 48 in 20 to 30 mV Threaded

SKU CH-46G3-87G4C

A 48-inch thermocouple produces 20 to 30 mV for standing-pilot systems and includes a Tinnerman clip

  • Product typeThreaded
  • 20 to 30 mV output powers gas valves reliably
  • 48 inch copper-nickel cable reaches pilot assemblies easily
  • Threaded coaxial connection fits universal Uni-couple systems
  • Stainless steel probe resists high-temperature corrosion
  • Includes Tinnerman clip for secure mounting

Product Identity

The Robertshaw 1970-048 is a 48 in thermocouple designed for standing pilot systems in gas-fired appliances. It produces a 20 to 30 mV output and uses a threaded coaxial process connection for universal compatibility with Uni-couple series equipment.

Included Accessories

A Tinnerman clip is supplied with the thermocouple to secure the probe in position during installation. The clip simplifies mounting and helps maintain consistent contact between the probe and the pilot flame for reliable millivolt generation.

Installation Notes

The copper and nickel alloy cable with stainless steel probe threads into the gas valve using the coaxial connection. Careful routing of the 48 in lead avoids kinks that could affect output, and the probe must sit fully in the pilot flame to sustain the required millivolt range.

How it compares

Measured against everything we stock in General Hardware & Accessories, at today’s prices. Recalculated every night.

Price $9.99
Cheaper than about 80% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameRobertshaw
Product typeThreaded

Questions about this item

How often should the 20 to 30 mV thermocouple be checked or replaced in a standing pilot system?

Inspect the stainless steel probe and copper-nickel cable annually for corrosion or soot buildup; replace if the millivolt output drops below the gas valve's minimum threshold.

What is the first limit reached when the 48 in thermocouple runs continuously in a pilot flame?

The 20 to 30 mV output ceiling is the primary limit; sustained overheating can degrade the element and reduce voltage below what the valve requires.

How much heat does the 3/8 in diameter probe add to the pilot assembly during all-day operation?

The probe is heated by the pilot flame itself to generate 20 to 30 mV; it does not produce additional heat beyond normal pilot combustion.

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