​The Honeywell R7847A1025 is a solid-state, plug-in rectification flame amplifier designed for integration with Honeywell's 7800 Series relay modules.  It operates by detecting rectified signals from flame sensors, confirming the presence of a flame in combustion systems.​

Key Features:

• Flame Failure Response Time: Offers a response time of 0.8 or 1.0 seconds, ensuring prompt detection of flame loss.​

• Flame Signal Strength: Measures flame signal strength ranging from 0.0 to 5.0 VDC, providing accurate monitoring.​

• Compatibility: Designed for use with rectifying flame rods, including models C7004, C7005, C7007, C7008, C7009, and Q179.​

• Integration: Easily plugs into 7800 Series relay modules via a keyed printed circuit board edge connector, ensuring proper orientation and secure connection.

• Color Coding: Features a green label to indicate rectification flame detection type, aiding in quick identification.​

This amplifier is suitable for applications involving gas or oil fuels and is commonly used in commercial and industrial burner control systems.  Its design facilitates straightforward installation and reliable performance, contributing to the safety and efficiency of combustion processes.​  When purchasing part numbers R7847A1025, RM7890A1015, and Q7800F1004 together, they serve as a replacement for RA890F1338.