Net IR-S Infrared Flame Detector

Control Systems


To meet the demands of modern monitoring and control systems in place at thermal power plants, the Net IR-S Infrared Flame Detector combines the proven IR-S type flame detector that has been successfully installed in many power plants with Mitsubishi Power' DIASYS Netmation control system, resulting in a flame detector product that functions as a burner control system.

The sensor unit of Net IR-S is the same as a conventional IR-S sensor and can be used for any of the following fuels: fuel oil, coal and gas. In addition, the superb detection reliability, maintainability and cost performance of the IR-S sensor are maintained.


Furthermore, the decision circuit is built as a module of DIASYS Netmation. It is used along with an upper layer of Netmation to offer an easy-to-use interface. The panel of Net IR-S can be designed so that the Net IR-S works as a stand-alone flame detector system independent from a burner control system.

If you replace a conventional flame detector with this new type, the pre-existing 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 Reused Replaced
Guide Pipe Reused Reused
Cooling-air Piping Reused Reused
Cooling Fan Reused Reused


High sensitivity design

High sensitivity to the intensity of flame enables stable detection of the burner flame. The flame is detected through the unlit zone.

Extended detection range

The sensor has 100 times 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 during boiler normal operation.

Long-life sensor

Because a long-life infrared semiconductor sensor element is used, periodic replacement is not necessary.

Decreasing the number of panels

The detector unit is compact with a space-saving design which allows one panel to incorporate 40 corners.

Reuse of existing boiler facilities

When you replace a flame detector, work is not necessary for the boiler itself.

Reuse of cable

Changing the cable between the sensor and the panel is not necessary. (When the existing system uses UV-type detection)

System Configuration

Flame Detector Panel

Net IR-S Infrared Flame Detector

Net IR-S Infrared Flame Detector


Flame Detector Panel


Flame Detector Module

Flame Detector Main Unit


Flame Detector Main Unit


Cross Sectional View of Sensor Head

For Fuel Oil Burner

The following example applies to a fuel oil burner.



Sensor Unit

The specifications of the sensor unit are as follows.

Structure Explosion-proof (Exd II BT4), waterproof
Dimensions Entire Length Optional
Guide Pipe 50A (40A)
Detection Wavelength 500 - 1,100nm
Allowable Temperature Sensor Tip Not exceeding 400℃
Inside of Guide Pipe Not exceeding 200℃
Amplifier Not exceeding 60℃
Cooling Air Air Pressure In-furnace pressure+150mmAq
Air Flow 15Nm3/min per sensor

Flame Detector Panel

The specifications of the flame detector panel are as follows.

Dimensions 2,300mm (H) ×810mm (W) ×800mm (D)
  • Flame Detector Unit
  • Redundant Power Modules
  • Redundant Media Adapters
  • Terminal Base Unit
Output Signals Flame on 1a
Low luminance level 1a
Power loss 1b
Contact capacity DC125V / AC120V 0.5A
Ambient Temperature 0 to 50℃