The Leuze PRK5/4P is a compact polarized retro-reflective photoelectric sensor designed for industrial object detection. It belongs to Series 5 and works on the reflection principle using a red LED light source. This model supports a guaranteed operating range of 0.02 to 4.5 m with reflector TK(S) 100x100, while the typical operating range limit is up to 6 m with the same reflector. It operates on 10 to 30 V DC, offers 2 PNP digital switching outputs, and is built with IP67 protection for industrial environments.
This sensor is suitable for general factory automation tasks where reliable object presence detection is required. Its compact housing and cable connection make it useful in conveyor systems, packaging machinery, material handling systems, machine automation panels, and industrial detection points. The datasheet identifies it as a retro-reflective sensor intended for standard sensing use, not personnel safety.
Sensor type: Polarized retro-reflective photoelectric sensor
Part number: 50117705
Model: PRK5/4P
Operating range: 0.02 to 4.5 m
Operating range limit: 0.02 to 6 m
Light source: Red LED
Wavelength: 620 nm
Supply voltage: 10 to 30 V DC
Outputs: 2 PNP digital switching outputs
Output 1: Light switching
Output 2: Dark switching
Switching frequency: 500 Hz
Response time: 1 ms
Protection rating: IP67
Protection class: III
The sensor has compact dimensions of 14 mm x 32.5 mm x 20.2 mm. The housing material is plastic, specifically ABS, and the lens cover is also plastic. The housing color is black and red, the net weight is 70 g, and the recommended tightening torque for M3 fastening is 0.9 N·m.
The PRK5/4P comes with a 2,000 mm cable, PUR sheathing, black cable color, and a 4-wire connection with 0.2 mm² wire cross-section. The conductor assignment is:
Brown: V+
White: OUT 2
Blue: GND
Black: OUT 1
The sensor includes 2 LEDs for status indication:
Yellow, continuous light: Light path free
Yellow, flashing: Light path free, no function reserve
Green, continuous light: Operational readiness
The PRK5/4P is designed for demanding industrial conditions, with an operating temperature range of -40 to 60 °C and storage temperature range of -40 to 70 °C. It carries IP67 protection, c UL US approval, and follows IEC 60947-5-2.
The datasheet lists several compatible reflectors and reflective tapes for use with this sensor. Common options include:
50108300 – REF 4-A-50x50
50003192 – TK 100x100
50003189 – TK 30x50
50024127 – TK 82.2
50022816 – TKS 100X100
50081283 – TKS 20X40
50023525 – TKS 30X50
50040820 – TKS 40X60
The following accessories are listed in the datasheet for this model:
50118542 – BT 200M.5 mounting bracket
50124651 – BT 205M-10SET mounting device set
50117829 – BTP 200M-D12 mounting system
50117255 – BTU 200M-D12 mounting system
This product is not a safety sensor and must not be used for personnel protection. It should only be commissioned by competent persons and used according to its intended application. For UL applications, it is specified for use in Class 2 circuits.
Before installation, confirm the correct DC power supply range (10–30 V DC), proper wiring polarity, and the correct reflector selection based on the required sensing distance. For best performance, use compatible reflectors from the datasheet and ensure alignment with the optical axis shown in the dimensional/electrical section.
If the sensor does not switch correctly:
Check that the supply voltage is within 10–30 V DC.
Verify wiring polarity and output connection.
Confirm that a compatible reflector is installed.
Check the LED status: green indicates readiness, while yellow indicates light path condition.
Recheck mounting and alignment if sensing performance is weak.
Q1. What type of sensor is Leuze PRK5/4P?
It is a polarized retro-reflective photoelectric sensor.
Q2. What is the supply voltage of PRK5/4P?
It operates on 10 to 30 V DC.
Q3. What output type does this sensor provide?
It provides 2 PNP digital switching outputs.
Q4. What is the sensing distance?
The guaranteed operating range is 0.02 to 4.5 m with reflector TK(S) 100x100.
Q5. Is this sensor suitable for harsh environments?
Yes, it is rated IP67.
Q6. Can this sensor be used as a safety sensor?
No. It is not intended for personnel protection.