Mitsubishi Electric MELSEC-Q PLC Input Module

Digital I/O Modules

The ST Series Digital Input/Output modules come in various sizes and

capacities, with counts as low as 2 points and as high as 16 points.

These modules can be assembled in any order and mixed with analog

I/O modules as well. Each I/O module requires a corresponding base

module, which will be individually keyed to that type of I/O module 

after the first use. This prevents spare modules to be placed in incorrect

position during maintenance such as Online Module Change.

The IR-S type infrared flame detector is an excellent high sensitivity type that

excels in “detection reliability”, “maintainability” and “economy”.

It supports boiler fuel diversity and low NOx (nitrogen oxide) operation.

By detecting the “average value” and “variation” of the infrared intensity of the

burner flame light transmitted to the infrared sensor (semiconductor element)

via a light guide (optical fiber), the detector can distinguish between the flame

and the light due to the furnace.

The detector distinguishes between flame and infrared light due to the red heat

of the furnace wall and detects flame fluctuations in the burner's ignition zone.

The IR-S type infrared flame detector has low brightness flame detection sensitivity

and a wide dynamic range, so it can be used for a variety of fuels such as natural

gas, heavy oil, and coal.

Features

• High sensitivity design

• High sensitivity to flame intensity enables stable detection of burner flames.

Flame is detected through unlit areas.

• Extended detection range

• With 100 times the dynamic range of conventional products, this sensor enables

stable detection of flames from slow burning to high intensity. No sensitivity

adjustment of the sensor is required in the field.

• Easy Maintenance

• A spherical lens is used to eliminate the need to clean the sensor window during

normal boiler operation.

• Long Life Sensor

• No periodic replacement is required due to the use of long-life infrared

semiconductor sensor elements.

• Fewer panels

The detector unit is compact and features a space-saving design that allows one

panel to cover up to 40 corners.

System Configuration

Flame Detector Panel

Flame detector main unit

The H-25 Series package design offers the following advantages:

• Minimizes field installation effort and time

• Flexible layout

• Short lead times

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