CNTR Sensor

CNTR-ContrastSensor_lrgThe CNTR sensor combines small spot size and fast response to achieve high-speed contrast detection capable of detecting a wide variety of marks and objects. The CNTR effectively detects contrast differences between many colors on various surfaces over a range of 50 grayscale levels. The modulated white light source in the CNTR is focused to a 2.5 to 3 mm spot and directed toward a target. The diffused light returning to the sensor is measured. When the level is equal to or exceeds the threshold the discrete output changes state. Due to the fast response of the sensor, it is suitable for use in high-speed applications. The sensor provides a discrete output that automatically configures to NPN and PNP. A PLC or a computer can be used to monitor the status of the discrete output signal.


  • Fast response combined with small spot size allows for high-speed operation
  • Digital NPN/PNP output which is automatically detected, plus analog output produces communication versatility
  • Learning function combined with dual color LED programming indication enables quick set up
  • Compact, IP65 enclosure permits usage in a variety of applications


Model CNTR Contrast Sensor
White Light Source Broad spectrum LED, min.100,000 hours
Sensing Distance 28 mm
Spot Size (dia.): 3 mm
Depth of Field +/-3 mm from focal point (approx. 28mm)
Response Time 25uS
Switching Frequency 40kHz
LED Intensity 3 levels
Gray-Scale 00 to 50
Controls MARK and BKGD keys
Digital Output Auto-Detect PNP / NPN
0 to 5V (20 mV resolution) Analog Output
Power Indicator Green LED
Detect Indicator Yellow LED
Programming Indicator Yellow/green LED
Data Retention EEPROM non—volatile memory
Dimensions 2.0”(51mm) x 2.4”(61 mm) x 1.0”(25 mm)
Weight 0.21 lbs. (95 g)
Supply Voltage 10 to 24 VDC
Operating Current 60 mA
Short Circuit Protection Discrete output
Overload/Reverse Polarity Protection Supply voltage
Operating Temperature -20°C to 55°C
Storage Temperature -20°C to 70°C
Housing Plastic
Mechanical Protection IP65
Connector M12, 4-pin
Warranty 2-Years

Ordering Details

CNTR-1 Contrast Sensor with 3 mm detection spot, learn mode, NPN/PNP and analog outputs
LMS-CBL M12 cable
LMS-BRKT L Shaped mounting bracket for CNTR

Literature Download:

CNTR Contrast Sensor Manual