FD-A300P is a series of optical fiber type hot metal detection photo sensor (HMD) that directly detect infrared energy emitted from heated material (steel products, etc.).
Equipped with a controller that employs an 8-bit microcomputer, this intelligent hot metal detection sensor integrates various functions.

• Sensitivity adjustment unnecessary: Auto sensing mode
  Auto sensing mode automatically adjusts a threshold level based on the received light intensity at detection of heated material and manual mode that allows manual setting of the threshold are available.
• One sensor for a wide range of temperatures
  Two different ranges for low and high temperatures can be switched with external signal and support low and high temperatures.
• Numerical indication of received light intensity convenient for threshold setting
  Received light intensity at detection of heated material is represented in value between 0.1 and 10.0 for arbitrary setting of output operation level.
  Broad dynamic range of amplifier allows numerical expression of wide range of temperatures of heated materials in analog quantity, which, unlike the conventional HMD sensitivity adjustment, facilitates setting of threshold in concrete figures.
• Recall function: Received light intensity detected in the past viewable
  Maximum received light intensity of heated material detected is stored to allow viewing during nondetection.
  Eight most recent maximum received light intensities of heated materials are stored to allow viewing of previous received light intensities in figures by selecting a mode.

Lowest Detectable Temperature

Select between two (high and low) temperature ranges with the mode setting

Guidelines are given below for the temperature of a detection object larger than the detecting field of view with optical head (OHA) and fiber optic cable (FG2) used for detection.

Guidelines for the minimum temperature of detection objects

The minimum temperature depends on the length of the fiber optic cable used or the detecting field of view of the optical head.
Temperatures shown in this table are for heated material larger than the field of view. If the material is smaller than the field of view, the lowest detectable temperature is increased. The guidelines are for the minimum temperatures of detection objects with margins of about four times as much as the inherent performance. For detailed data, see “Minimum Detectable Object and Lowest Detectable Temperature.”

Amplifier unit

Fiber optic cable

Example of combination of Airless hood and optical head
Optical head Model OHA
Airless hood Model F38A

Example of combination of Airless hood and optical head
Optical head Model OHW1 ／ OHW2
Airless hood Model F38W

Example of combination of air purge hood and optical head
Optical head Model OHA
Air purge hood Model F38PC

Example of combination of air purge hood and optical head
Optical head Model OHW1 ／ OHW2
Air purge hood Model 302W

Control output

Stability output (STB output)

When connecting an inductive load such as relay, be sure to use diode, surge absorber, etc. to protect output transistors from counter electromotive force.

Optical head

	Optical headOHA	Description Optical head (Standard view)
	Optical headOHW1	Description Optical head (Wide view)
	Optical headOHW2	Description Optical head (Wide view)

Hood

	HoodF38A	Description Airless hood (Standard view) Length 120mm Applicable optical head OHA OHAN OHAN10
	HoodF38A-02	Description Airless hood (Standard view) Length 200mm Applicable optical head OHA OHAN OHAN10
	HoodF38A-03	Description Airless hood (Standard view) Length 300mm Applicable optical head OHA OHAN OHAN10
	HoodF38A-04	Description Airless hood (Standard view) Length 400mm Applicable optical head OHA OHAN OHAN10
	HoodF38A-05	Description Airless hood (Standard view) Length 500mm Applicable optical head OHA OHAN OHAN10
	HoodF38W	Description Airless hood (Wide view) Length 200mm Applicable optical head OHW1 OHW2
	HoodF38PC-02	Description Air purge hood (Standard view) Length 200mm Applicable optical head OHA OHAN OHAN10
	HoodF38PC-03	Description Air purge hood (Standard view) Length 300mm Applicable optical head OHA OHAN OHAN10
	HoodF38PC-04	Description Air purge hood (Standard view) Length 400mm Applicable optical head OHA OHAN OHAN10
	HoodF38PC-05	Description Air purge hood (Standard view) Length 500mm Applicable optical head OHA OHAN OHAN10
	Hood302W	Description Air purge hood (Wide view ) Applicable optical head OHW1 OHW2

Fiber optic cable

	Fiber optic cableFG2	Description Fiber optic cable Length 2m
	Fiber optic cableFG3	Description Fiber optic cable Length 3m
	Fiber optic cableFG4	Description Fiber optic cable Length 4m
	Fiber optic cableFG5	Description Fiber optic cable Length 5m
	Fiber optic cableFG7	Description Fiber optic cable Length 7m
	Fiber optic cableFG10	Description Fiber optic cable Length 10m
	Fiber optic cableFG15	Description Fiber optic cable Length 15m
	Fiber optic cableFG20	Description Fiber optic cable Length 20m
	Fiber optic cableFG30	Description Fiber optic cable Length 30m