Multi-Beam Sensor


This is an infrared beam sensor for multiple beams, which is designed to detect obstacles on the doorway of elevator. It is an intelligent sensor, which assures smooth entering or exiting of people, carrier, stroller, etc., from the elevator by restricting the door from closing when it detects any obstacle on the doorway. If it is combined with a dedicated power supply box, it is adaptable to an AC power supply circuit or control circuit that utilizes contactors.


Typical Applications of Multiple-Beam Sensor


Common Operating Conditions

Operating ambient temperature
-10 to +50 C
Operating ambient humidity
90% RH or less
Vibration resistance
10 to 40 to 10 Hz sweep for 5 minutes, double amplitude 0.5 mm, for 2 hours each in X/Y/Z direction
Impact resistance
Shall withstand impacts in the packed condition when dropped freely in 8 directions from 300 mm above the concrete floor.

Sensor Section (MX-84NL2)

Detecting method
Translucent type
Light source
Infrared LED
Emission wavelength
Number of elements
Number of scanning optical axes
Max. 84
Element interval
Lower 4 elements: 58.5 mm on average, upper 15 elements: 117 mm on average
Lowest optical axis
15 mm from bottom end of case
Detection width
1,829 mm, from bottom end of case to topmost element
Setting distance
0~3m (10°C ≦ Ta ≦ +40°C)
0~2.5m (-10°C ≦ Ta ≦ +50°C)
Power supply voltage
DC 24 V + 10%, -20%, power supply ripple 10%
Power consumption
Projector:1.5W or less, receiver: 2 W or less
Control output
Circuit type
NPN transistor open collector output
100 mA or less, resistance load, with over-current protecting function
Voltage drop at output “ON” – 2 V MAX.
Leakage current at output “OFF” – 100μ A MAX.
Operation mode
Control output “ON” when receiving total optical axes
Response time
At detecting: 80 ms MIN. (Main scan)/400 ms MAX. (Other than main scan)
At reset: 400 ms MAX.
Holding time
150ms MIN
Time-out function
Optical axis cut-off function at failure of sensor
Condition: When the same optical axis has been shielded longer than the time-out setting value
Adaptable up to 5 optical axes (elements), which do not adjoin each other
Setting time.
Approx. 45 sec
External connection
Extension of flexible cable length: 6 m (-6) or 10 m (-10)
Ambient operating illuminance
5,000 lx or less for fluorescent lamp. Direct incident light to receiver not allowed.
100,000 lx or less for sunlight. Direct incident light to receiver not allowed.
50,000 lx or less where sunlight irradiates directly receiver.
Enclosure rating
Projector/receiver: Approx. 0.7 kg (Excluding cable), cable: 35 g/m