Robertshaw 900-041 Flame Sensing Current Monitor

Product Description

The ROBERTSHAW 900-041 is a flame sensing current monitor designed to verify proper flame rectification signal in gas combustion systems. This device reads the microamp DC current produced by a flame sensor rod and confirms the signal is within acceptable range for safe burner operation. It is used during commissioning, troubleshooting, and routine maintenance on gas furnaces, boilers, and commercial heating equipment. Licensed HVAC technicians and combustion service professionals are the primary users of this instrument.

The 900-041 is suited for service work on residential and light commercial gas-fired heating systems where flame sensor performance needs to be verified or diagnosed. Technicians use it when a furnace is locking out on a no-flame fault, when a sensor rod is suspected of degradation, or when documenting flame signal readings during a commissioning inspection. It removes guesswork from flame sensor diagnostics by providing a direct current reading without requiring a separate digital multimeter setup.

Key Features

• Dedicated flame sensing current measurement for accurate microamp DC readings
• Supports diagnosis of weak or failed flame sensor rods in gas combustion equipment
• Streamlines troubleshooting of no-flame lockout conditions on gas furnaces and boilers
• Compact instrument suited for field service use by HVAC technicians

Compatibility

Designed for use with gas-fired furnaces, boilers, and other combustion appliances equipped with standard flame rectification sensor rods. Consult system documentation to confirm signal range requirements before use.

Installation Notes

This instrument is used by licensed HVAC or combustion technicians during live-flame diagnostic procedures. Always follow applicable NFPA 54 and equipment manufacturer safety guidelines when working on gas appliances with active burners. Connect the monitor in series with the flame sensor circuit per the instrument instructions, and never bypass or permanently alter control wiring during testing. Disconnect power and shut off gas supply before making any wiring changes to the system under test.

Technical Specifications

• Function: Flame sensing current monitor
• Measurement Type: Microamp DC flame rectification signal

Standard Information

• Brand: ROBERTSHAW
• Manufacturer Part Number: 900-041