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White Rodgers mercury flame sensor, transparent probe with 12 inch capillary tube and plug-in lead

WHITE RODGERS (EMERSON ELEC)

WHITE RODGERS (EMERSON ELEC) 30A46 105S1 Mercury Flame Sensor hvac control

SKU CH-8Y32-KYJZD

Mercury flame sensor with 12-inch capillary tube and 12-inch lead for natural gas or LP systems

  • ColorTransparent
  • Universal replacement fits hot-surface ignition systems
  • Mercury flame sensor detects pilot flame on natural gas or LP
  • 12-inch capillary tube and lead simplify routing
  • Rated 90 VA at 30 V AC and 125 VA at 240 V AC
  • Withstands rod temperatures up to 1,400 °F

Mercury Flame Sensor Replacement

This White-Rodgers mercury flame sensor serves as a universal replacement for hot-surface ignition systems. It fits natural gas and LP fuel types with a sleeve-mount probe and plug-in electrical connection. The capillary tube and lead wire each measure 12 inches for flexible routing. A transparent probe tip withstands rod temperatures up to 1,400 degrees Fahrenheit during operation.

HVAC Technicians and System Retrofits

The sensor suits technicians repairing or upgrading residential and light-commercial heating equipment that uses mercury-based flame detection. Buyers who need a modern electronic flame rod or an optical sensor should look elsewhere because this part relies on traditional mercury-switch technology. It also does not fit systems requiring a different mounting bracket or probe angle than the universal sleeve design provided.

90 VA at 30 V AC Rating

The volt-ampere rating of 90 VA at 30 volts AC determines whether the sensor matches the gas valve and control circuit in the target appliance. Exceeding this rating can cause premature failure or unreliable flame proving, so verifying the control voltage and load is essential before installation. A 125 VA rating at 240 volts AC is also specified for higher-voltage applications.

Highlights

  • Universal replacement fits hot-surface ignition systems
  • Mercury flame sensor detects pilot flame on natural gas or LP
  • 12-inch capillary tube and lead simplify routing
  • Rated 90 VA at 30 V AC and 125 VA at 240 V AC
  • Withstands rod temperatures up to 1,400 °F

Specifications

BrandWHITE-RODGERS
ColorTransparent

Questions about this item

How can I confirm the 30A46 105S1 flame sensor is operating correctly after installation?

The sensor generates a microamp signal when the pilot flame contacts the probe; a multimeter reading within the appliance manufacturer's specified range confirms proper operation.

What components are included with the 30A46 105S1 and what must be purchased separately?

The package contains the mercury flame sensor with a 12 inch capillary tube and plug-in lead; mounting hardware and the gas valve or ignition control module are not included.

Which fuel type version of the 30A46 105S1 should I select for my system?

This single model is rated for both natural gas and LP applications, so no separate fuel-specific version needs to be chosen.

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