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IR-S Infrared Flame Detector


Recently, due to diversified boiler fuels and low NOx (nitrogen oxide) operation, it is becoming difficult to monitor a burner flame using the conventionalultraviolet or infrared light detection methods.

Based on this change in the business environment, Mitsubishi Power has improved on the conventional IR type flame detector to create a new type of flame detector product: the "IR-S type infrared flame detector" with superb "detection reliability," "maintainability," and "cost performance."

A IR-S type infrared flame detector uses a light guide (optical fiber) to guide the light from the flame to an infrared sensor (semiconductor device). The "average value" and "variance" of the intensity of the infrared light are detected so that the infrared light intensity from the burner flame and that from the heated furnace wall are differentiated. Consequently, the variance of the flame in the burned zone in the burner is detected.

This detection method greatly improves the detection sensitivity and dynamic range for low intensity levels and enables application to various fuels such as gas, fuel oil, and coal.

The newly developed sensor circuit of the IR-S type infrared flame detector offers reliable flame monitoring for boilers.


If you replace a conventional flame detector with this new type, the preexistent equipment can be reused.

Equipment name Existing methods of flame detection
UV Type IR Type
Sensor unit Replaced Replaced
Flame detector panel Replaced Replaced
Sensor cable Not replaced Replaced
Guide pipe Not replaced Not replaced
Cooling-air piping Not replaced Not replaced
Cooling fan Not replaced Not replaced


  • High sensitivity design
    The newly designed sensor circuit enables stable detection of the burner flame. The flame is detected through the unlit zone.
  • Extended detection range
    The sensor has 100 times the dynamic range of a conventional product and allows stable detection from slow combustion to a high intensity flame. No sensitivity adjustment is required for the sensor at the site.
  • Maintenance free
    A ball lens is used to eliminate the need to clean the sensor window.
  • Long-life sensor
    A long-life infrared semiconductor sensor is used. Periodic replacement is not necessary.
  • Decreasing the number of panels
    The detector unit has a compact, space-saving design that allows one panel to incorporate 40 corners.
  • Reuse of existent boiler facilities
    When you replace the flame detector, work is not necessary for the boiler itself.
  • Reuse of the cable
    Changing the cable between the sensor and the panel is not necessary. (If the preexisting type is UV.)

System Configuration

Flame detector panel

Flame detector panelFlame detector panel

Flame detector unitFlame detector unit

Flame detector

Flame detector

Fuel oil burner

The following is an example of a fuel oil burner,

Fuel oil burner


Sensor unit

The specifications of a sensor unit are as follows.

Item Specification
Type Explosion-proof (Exd2 BT4), waterproof
Dimensions Entire length Any value
Guide pipe 50A (40A)
Detection wavelength 500~1100nm
Sensor tip Not exceeding 400 deg C
Inside of guide pipe Not exceeding 200 deg C
Amplifer Not exceeding 60 deg C
Cooling air Air pressure [In-furnace pressure] + 150mmAq
Air flow 1.5Nm³/min per sensor

Flame detector panel

The specifications of a flame detector panel are as follows.

Item Specification
Dimensions 2,300mm(H) x 810mm(W) x 800mm(D)
Structure Flame detector unit, duplicated power supply system, terminal unit
Flame on 1a
Low luminance level 1a
Power loss 1b
Contact capacity AC/DC 48V, 1.25A
Ambient temperature 0 to +50 deg C

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