Wenglor K1R87PCT2 Retro Reflex Sensor for Transparent Objects

wenglor has the right retro-reflex light barrier for every application.

A reflector must be used in combination with these sensors. wenglor has the right retro-reflex light barrier for every application. Even crystal-clear objects and sheet products can be reliably recognized. The sensor is easy to install with its integrated M18 threaded fixation, and can be easily protected as well. Time delay can be activated by RS-232 interface.


  • Recognition of clear glass
  • Dynamic readjustment of the switching threshold
  • Simple installation
  • Teach-in, external teach-in


Dynamic Pressure Monitoring of Vials with Retro-Reflex Sensors for Transparent Objects

Before filling and packaging in the pharmaceuticals industry, vials must be counted and their exact number and position monitored on an infeed conveyor. A retro-reflex sensor for transparent objects is mounted transversely to the side wall for this so-called dynamic pressure monitoring. If the sensor detects a jam, it regulates the belt speed so that no further vials are conveyed. Once the bottleneck is cleared, the normal quantity of vials is conveyed again.

Retro-Reflex Sensors for Transparent Objects

In addition to detecting glossy, chrome-plated or reflective surfaces, retro-reflex sensors for transparent objects also detect and count transparent objects such as glass or film using red light. Objects are detected by interrupting the light beam between the sensor and the reflector.


Optical Data

Range 4,000 mm
Reference Reflector/Reflector Foil RQ100BA
Clear Glass Recognition yes
Switching Hysteresis  < 5 %
Light Source Red Light
Polarization Filter yes
Service Life (T = +25 °C) 100,000 h
Max. Ambient Light 10,000 Lux
Opening Angle 5 °
Single-Lens Optic yes

Electrical Data

Supply Voltage 10 … 30 V DC
Current Consumption (Ub = 24 V) < 40 mA
Switching Frequency 1,700 Hz
Response Time 250 µs
On-/Off-Delay (RS-232) 0 … 5 s
Temperature Drift < 5 %
Temperature Range -10 … 60 °C
Switching Output Voltage Drop < 2.5 V
PNP Switching Output/Switching Current 200 mA
Residual Current Switching Output < 50 µA
Short Circuit Protection yes
Reverse Polarity Protection yes
Overload Protection yes
Lockable yes
Teach Mode MT
Protection Class III

Mechanical Data

Setting Method Teach-In
Housing Material Plastic
Full Encapsulation yes
Degree of Protection IP67
Connection M12 × 1; 4-pin


PNP NO yes
RS-232 with Adapterbox yes

Adjustable parameters

Circuit NC
Other parameters Off-delay


Datasheet : Wenglor K1R87PCT2 Retro Reflex Sensor for Transparent Objects

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