Thermocouples & Thermopiles

Thermocouples and thermopiles are heating-system components used by service professionals and maintenance teams. Thermocouples sense pilot flames in standing-pilot gas-fired heating systems to support pilot safety control functions, while thermopiles generate power for automatic millivolt gas control systems without an outside power source.

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Helpful Buying Guide

Choose Thermocouples and Thermopiles for Compatible Heating-System Service

Start by identifying whether the application uses a standing-pilot thermocouple or an automatic millivolt gas-control thermopile. Then compare the required lead length, electrical output, connector style, and included installation components represented by the available options.

Visual Guide

Popular examples in this category

750 mV Thermopile with 35-Inch Leads and Terminal Block750 mV Thermopile with 35-Inch Leads and Terminal BlockWBB39414548-Inch Thermocouple with Adapter and Push-In Clip48-Inch Thermocouple with Adapter and Push-In ClipWBB39393636-Inch Thermocouple for Standing-Pilot Gas Heating Systems36-Inch Thermocouple for Standing-Pilot Gas Heating SystemsWBB76272335-Inch Lead Thermopile with PG9 Adapter35-Inch Lead Thermopile with PG9 AdapterWBB394144
Use Cases

Service pilot and millivolt control systems

Thermocouples are used on standing-pilot gas-fired heating systems and pilot burners. Thermopiles are used to provide generated power for automatic millivolt gas control systems.

How to Choose

Match component type and connection details

Choose a thermocouple for pilot flame sensing or a 750 mV thermopile for millivolt control power. Compare lead length, mounting arrangement, terminals, adapters, clips, and connector compatibility.

Applications

Support heating-system maintenance

These components are suited to technicians, HVAC service professionals, facility maintenance teams, and commercial maintenance professionals working on compatible gas heating equipment.

Additional Information

Review included installation parts

Available configurations include push-in clips, adapters, PG9 adapters, terminal blocks, spade terminals, split nuts, and 11/32-32 male nut connectors.

24–72 in.Thermocouple lengths

Listed thermocouple options range from 24 to 72 inches.

35 in.Thermopile lead length

Listed thermopile configurations include 35-inch leads.

30 mVThermocouple output

Listed standing-pilot thermocouples generate 30 millivolts.

750 mVThermopile output

Listed thermopiles provide 750 mV for compatible millivolt controls.

Comparison Guide

Compare the represented component options

Use the system function, stated output, and installation configuration to narrow the selection.

Selection factorStanding-pilot thermocouplesThermopiles
Primary useSense the pilot flame and support pilot safety control operationProvide power for automatic millivolt gas control systems
Stated output30 mV on listed models750 mV on listed models
Lead and installation options24-, 30-, 36-, 48-, and 72-inch options; adapters, clips, male nut connectors, or snap-fit design on listed models35-inch leads; spade terminals, terminal block, push-in clip, split nut, or PG9 adapter on listed models
Connection considerationsListed models include 11/32-32 male nut connectors for compatible Pilotstat safety control power unitsListed models include spade terminals or a terminal block, depending on configuration
Planning Guide

Plan the right fit before choosing

Select the right component type

Thermocouples sense pilot flames; thermopiles power millivolt controls

Standing-pilot thermocouples respond to heat from the pilot flame and generate the millivolt signal used to support pilot safety control operation. Thermopiles use series-connected thermocouples to generate 750 mV for compatible automatic millivolt gas control systems.

  • Choose thermocouples for standing-pilot gas-fired heating systems.
  • Choose thermopiles for automatic millivolt gas control systems.
  • Compare the stated 30 mV thermocouple output or 750 mV thermopile output.
Plan the installation

Match reach, mounting, and connection components

Thermocouple options include 24-, 30-, 36-, 48-, and 72-inch lengths, while listed thermopiles have 35-inch leads. Available installation arrangements include push-in clips, adapters, PG9 adapters, spade terminals, terminal blocks, split nuts, and male nut connectors.

  • Measure the needed routing distance before choosing the lead length.
  • Check whether the application calls for a push-in clip, adapter, or PG9 adapter.
  • Confirm the required connector or terminal arrangement for the compatible control unit.
Consider pilot-burner fit

Review snap-fit and sheath features where needed

A 72-inch snap-fit thermocouple is designed for installation in most pilot burner applications and supports both slim and standard thermocouple types. Its brass sheath provides extra insulation in high-ambient-temperature conditions.

  • Consider snap-fit construction for compatible pilot burner applications.
  • Compare slim and standard thermocouple compatibility when applicable.
  • Consider a brass sheath where extra insulation in high-ambient-temperature conditions is needed.
FAQ

Common questions before buying

What is the difference between a thermocouple and a thermopile?

Listed thermocouples sense pilot flames in standing-pilot gas heating systems, while listed thermopiles generate 750 mV power for automatic millivolt gas control systems.

What thermocouple lengths are represented?

The listed thermocouple options include 24-, 30-, 36-, 48-, and 72-inch lengths.

What output do the listed standing-pilot thermocouples provide?

Listed standing-pilot thermocouples provide 30 mV output.

What installation accessories are available?

Depending on the configuration, listed accessories include push-in clips, adapters, PG9 adapters, terminal blocks, spade terminals, and split nuts.

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