Honeywell, Q340A1090/U, Thermocouple, 1400 deg F(Hot), 780 deg F (Cold)

Honeywell Q340A1090 Thermocouple Kit – 36" Lead, 30 mV Output

The Honeywell Q340A1090 is a 36-inch universal thermocouple designed for use with standing pilot gas-fired heating systems. It delivers a consistent 30 millivolt output to power Pilotstat® safety controls and similar devices requiring flame presence verification. The thermocouple is engineered for high-temperature reliability and is compatible with many standard pilot burners.

Product Features

• Output Voltage: 30 millivolts for flame safety control operation
• Lead Length: 36 inches for extended reach in diverse installation configurations
• Connector: Male connector nut with included push-in clip and adapter for secure installation
• Construction: High-temperature durable materials rated for continuous performance
• Application: Designed for use in gas-fired equipment with standing pilot ignition systems

Technical Specifications

• Millivolt Output: 30 mV
• Resistance: 0.02 ohms
• Lead Length: 36 inches
• Hot Junction Temp: Rated up to 760°C
• Cold Junction Temp: Rated up to 416°C
• End Fitting: Threaded male nut

Installation Considerations

The Q340A1090 is supplied with mounting hardware to facilitate integration with most standard pilot assemblies. Installations should comply with appliance manufacturer specifications and local codes. Electrical continuity, flame signal strength, and proper flame impingement should be verified after installation. This thermocouple is suitable for replacement applications in furnaces, boilers, and water heaters utilizing millivolt safety circuits.

Contractor Notes

This thermocouple is a common replacement part in service calls involving flame loss or safety switch faults. It offers reliable compatibility with legacy Honeywell Pilotstat® systems and other millivolt-based gas valve controls. Its durable design supports use in demanding environments and high-duty cycle applications.