Light curtains are supplied as a pair with a transmitter and receiver. The transmitter projects an array of parallel infrared light beams to the receiver which consists of a number of photoelectric cells. When an object breaks one or more of the beams a stop signal is sent to the guarded equipment.
The light beams emitted from the transmitter are sequenced, one after the other, and pulsed at a specific frequency. The receiver is designed to only accept the specific pulse and frequency from its dedicated transmitter. This enables the rejection of spurious infrared light and thus enhances their suitability as components within a safety system.
Typically, light curtains are connected to a safety relay which will remove motive power from the hazard in the event that an object is detected. Safety relays can be provided with muting functionality which enables the temporary disabling of the safety function to allow objects to pass through the light curtains without tripping the safety relay. This is particularly useful for machinery which has some semi-automatic procedures.

Items	Technical Parameters
Beams Number	94 beams (infrared)
Sensors Number	17 pairs (refer to pictures)
Sensors Interval	117 mm (refer to pictures)
Beams Center Points Interval	10.5mm/11.5mm (refer to pictures)
Scanning Form	Line by line
Response Time	61msec(relating to detecting points of scanning cycle)
Detecting Height	25-1860mm
Detecting Range	0~3m moving door
Light Immunity	100,000lux(visible light)
Allowable Deviation Angle	≤10°
Allowable Deviation Position	Vertical: ±10mm/7°
	Horizontal: ±5mm/5°
Protecting States	Cable fault
	Power fault
Current Consumption	Less than100mA
Protection Grade	IP65 standard
Ambient Temp.	-20°C~ +70°C
Storage Temperature	-40°C~ +80°C
Other functions	One transmitter is shielded after 120s' blocking
Indicator	Power (green LED)
	System fault/beams blocked(orange LED)
Shell Material	Aluminum alloy surface spray plastic(black)
Shell Cover (light filter)	Embedded installation of infrared penetrating for blocking off non-infrared
Authentication	TUV CE(EMC)
Working Voltage	12VDC
Power supply	220VAC or 24VDC