Flame Rod Sensor Circuit

Disconnect the flame sensor wire from sensor.

Flame rod sensor circuit.

This is known as a flame sensor or flame rod. Because of the flexibility of positioning a flame rod a pilot flame can be proven at the point of intersection with the main flame. It does this by generating a potential voltage at the flame sensing terminal this terminal is connected to the sensor with a conductor. Flame rods are found on nearly all induced draft burner systems and on many forced draft burners.

A special metal rod is mounted in the path of the flame. I am sensing a flame using a flame rod. Also some tips for servicing. It is essentially fail safe.

If proof of flame is not present the icm will de energize the gas valve and retry for ignition or lockout. A special metal rod is mounted in the path of the flame. The flame rod in your picture is not a thermocouple. I am using 12v ac at the input and at the output flame sensing circuit which is made of opamp some resistors and capacitors i get 1 6 2 4v when there is a flame and 3 8 4v when there is a short circuit and 5v when there is no flame.

In a nutshell the flame rectification system is an electrical process that causes a low level dc current to be conducted from the. The other connection in the circuit is the flame being in contact with a metal surface that acts as a ground. Once the board sends a call to the gas valve to open it monitors the current flow on the flame sensing rod. Depending on the system this voltage may be between 80 and 300 volts.

In a nutshell the flame rectification system is an electrical process that causes a low level dc current to be conducted from the. This video is part of the heating and cooling series of. The cpfs circuit 31 of the flame detector generates a comparable microampere dc current in response to a flame pulse signal in the 10 500 hz frequency range so that the uv flame detector can be used in place of a flame rod sensor with an existing burner control combustion safeguard circuit. Flame rods have the following advantages.

This one explains the electronics behind the flame rod control system. Troubleshoot flame sensor the flame sensor in any furnace proves combustion. The sensor needs to be cool to the touch when you clean it so it doesn t melt the scotchbrite pad and leave a residue on the flame rod. This is known as a flame sensor or flame rod.

If abnormal situations exist such as open circuits short. When no flame. Flame rods are found on nearly all induced draft burner systems and on many forced draft burners. After cleaning you should reinstall the flame sensor and take another reading in order to see how much you improved flame signal.

Most every flame rod system i have worked on puts and ac voltage on the flame rod. Quick response to flame failure. Proves flame at the point of ignition.