This photo sensor is a fiber radiation photo sensor (HMD) which can directly detect infrared energy radiated from heated materials such as heated steel.
The intelligent HMD has a wide dynamic range of amplifier (125 times conventional products), with a current output of 4-20mA.

• Double screen displaying threshold and receiving light intensity
  Displaying light intensity in numbers on double screen. One screen shows the light intensity when detecting heated material digitally from 0.0 to 12.0 in real time, and the other shows the threshold of output operation. The dynamic range of the amplifier is wide, and the wide temperature range of heated materials is displayed in analog.
• Current output of 4-20mA
  To survey assembly lines, this product outputs light intensity when detecting heated material, as an analog current.
• One sensor measures low and high temperatures
  Provided with two temperature ranges: one for low temperature and the other for high. The range can be changed using a switch.
• Simulation function
  Equipped with a simulation circuit for detecting heated materials. You can simulate the detection of heated materials with an external input.

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.
(The detectable temperature varies, depending on emissivity of the object.)

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
FD-A320
FD-A320H

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

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

Example of combination of air purge hood and optical head
Optical head Model OHAN/OHAN10
Air purge hood Model F38PC

Control output

Stability output (STB output)

Wiring

Detection field of view

Detection of red-hot steel

Detecting the presence of material at the outlet of furnace. The detecting head is highly heat-resistant.

• Fiber type HMD FD-A320

Optical head

	Optical headOHA	Description Optical head (Standard view)
	Optical headOHW1	Description Optical head (Wide view)
	Optical headOHW2	Description Optical head (Wide view)
	Optical headOHAN	Description Optical head (Narrow view)
	Optical headOHAN10	Description Optical head (Narrow view)

Hood

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

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