Keyence PZ-G42EP Square Reflective Sensor: PNP M12 Photoelectric Technical Guide
Product Introduction
The Keyence PZ-G42EP belongs to the PZ-G series of self-contained photoelectric sensors. Specifically, it adopts a rectangular housing with a diffuse-reflective sensing principle. The sensor detects targets at distances up to 300 mm when using a 10 × 10 cm white paper reference. Furthermore, the PNP open-collector output suits sinking-input PLC configurations common in North American and European control panels. The M12 pigtail connector simplifies replacement without rewiring the entire cable run. Therefore, maintenance teams appreciate this quick-disconnect design during line changeovers.
Core Value
Firstly, the PZ-G42EP combines short-range diffuse sensing with a compact rectangular footprint. This combination fits space-constrained mounting locations on conveyor side rails and packaging machinery. Secondly, the IP67 and IP69K enclosure ratings resist washdown and dust ingress in food and beverage plants. Thirdly, the 500 µs response time supports reliable detection of fast-moving cartons and small parts. Besides, the automatic different frequency function allows two units to operate adjacent to each other without optical crosstalk. Consequently, integrators deploy paired sensors for presence and position confirmation on the same production line.
Technical Insights
The Keyence PZ-G42EP operates on 10 to 30 VDC with a current consumption of 34 mA or less. Moreover, the control output handles 100 mA maximum with residual voltage below 1 V. The red LED light source provides visible alignment during commissioning. In addition, a single-turn trimmer with 230° rotation enables sensitivity adjustment without tools beyond a small flathead screwdriver. The operation mode selector switches between LIGHT-ON and DARK-ON logic. Meanwhile, the orange output LED and green stable-operation LED give immediate visual feedback. Specifically, the green LED extinguishes when sensing margin degrades. Therefore, technicians detect misalignment or lens contamination before a line stop occurs.
Installation & Maintenance
Mount the PZ-G42EP using M3 screws through the side mounting holes. Tighten these screws to a maximum torque of 0.5 N·m. For threaded mounting variants, the M18 nut torque limit reaches 1.0 N·m. Furthermore, route the sensor cable away from high-voltage lines to prevent electrical interference. During sensitivity setup, position the target and rotate the trimmer from MIN toward MAX until the orange indicator turns on. Then remove the target and confirm the indicator turns off. Besides, clean the lens cover with a soft cloth and mild detergent. Do not use solvents that attack the polyarylate lens material. Finally, verify the green stable LED remains lit during normal operation.
Buyer's Guide FAQ
Q1: What is the detection distance of the Keyence PZ-G42EP?
The sensor detects a 10 × 10 cm white paper target at up to 300 mm with maximum sensitivity.
Q2: Does the PZ-G42EP have a PNP or NPN output?
The PZ-G42EP provides a PNP open-collector output rated for 30 V and 100 mA maximum.
Q3: What connector type does this model use?
This model uses an M12 pigtail connector. The cable is sold separately for connector-type models.
Q4: Can two PZ-G42EP sensors mount side by side?
Yes. The automatic different frequency function supports up to two units in close proximity without interference.
Q5: What is the enclosure rating of the PZ-G42EP?
The sensor carries IP67, NEMA 4A/6/12, and DIN IP69K ratings for washdown and dust protection.
