Keyence PZ-G51N Photoelectric Sensor NPN

Keyence PZ-G51N Thrubeam Photoelectric Sensor

Product Introduction

The PZ-G51N belongs to the Keyence PZ-G series of built-in amplifier photoelectric sensors. This model uses a thrubeam sensing method, which delivers reliable detection over long distances. Specifically, it reaches a maximum detecting distance of 20 m. The red LED light source makes alignment easy during setup. Meanwhile, the NPN open collector output supports stable signal transmission to PLCs and controllers. As a result, the PZ-G51N suits many factory automation tasks, such as object counting, position detection, and safety gates.

Technical Specifications

The PZ-G51N provides a 20 m maximum detecting distance (65.6 ft). Its light source is a red LED. Sensitivity adjustment uses a 1-turn trimmer with a 230° range. Additionally, the response time is 500 µs maximum, which supports fast moving targets. The operation mode is LIGHT-ON/DARK-ON and remains switch-selectable. For status monitoring, the sensor includes four LEDs. The power indicator (T) is orange, and the output indicator (R) is orange. Furthermore, the stable operation LED is green, while the light receiving LED is red.

Electrical Parameters

The supply voltage ranges from 10 to 30 VDC nominal, including ripple (P-P) 10%. Current consumption stays low: the transmitter uses 20 mA or less, and the receiver uses 28 mA or less. The output type is NPN open collector. Control output handles 30 V maximum and 100 mA maximum. Residual voltage is 1 V maximum. Besides, the cable connection uses a pre-wired 2 m cable, which simplifies installation. Protection circuits include reversed polarity, overcurrent protection, and a surge absorber. For interference suppression, the sensor supports up to 2 units through polarization filters or automatic different frequency function.

Mechanical and Environmental Parameters

The housing material is glass-fiber reinforced PBT, which offers strong durability. The lens cover uses polyarylate (PAR). The PZ-G51N weighs approximately 60 g for the rectangular cable model, while the thrubeam transmitter weighs about 50 g. The protection rating meets IEC IP67, NEMA 4A, 6, 12, and DIN IP69K. Therefore, it withstands dust and water exposure in harsh areas. The operating temperature range is -20 to +55 °C with no freezing. Relative humidity stays between 35 and 85 % RH with no condensation.

Ambient light resistance reaches 5,000 lux maximum for incandescent lamps and 20,000 lux maximum for sunlight. Vibration resistance covers 10 to 55 Hz with 1.5 mm double amplitude for 2 hours in each X, Y, Z direction. Shock resistance is 1,000 m/s², tested 6 times in each X, Y, Z direction. These ratings ensure stable performance in demanding industrial environments.

Installation Guide

First, mount the transmitter and receiver on a firm bracket. Use the mounting hole part and tighten to 0.5 N·m maximum. Next, connect the 2 m cable to the power supply and load. Then, set the operation mode to LIGHT-ON or DARK-ON based on your application. After that, adjust the 1-turn trimmer until the stable operation LED turns green. Finally, verify alignment by checking the light receiving LED. If interference occurs, change the frequency setting or add polarization filters.

Packaging List

• 1 × Keyence PZ-G51N Thrubeam Photoelectric Sensor (Transmitter and Receiver)

• 1 × Pre-wired 2 m Cable

• 1 × Mounting Bracket and Screw Set

• 1 × Original Keyence Packaging Box

• 1 × Quick Reference Sheet

Shipping Methods: Fedex, UPS, DHL.

FAQ

Q1: What is the maximum detecting distance of the PZ-G51N?
A: The PZ-G51N offers a maximum detecting distance of 20 m (65.6 ft). This makes it suitable for long-range thrubeam detection.

Q2: Does this sensor include a connector cable?
A: No. The PZ-G51N comes with a pre-wired 2 m cable. You do not need a separate M12 connector cable.

Q3: What output type does the PZ-G51N provide?
A: It provides an NPN open collector output. The maximum load is 30 V and 100 mA, with residual voltage of 1 V maximum.

Q4: How do I adjust sensitivity on this Keyence sensor?
A: Use the 1-turn trimmer with a 230° range. Turn it slowly while watching the stable operation LED for the best setting.

Q5: What is the protection rating of the PZ-G51N?
A: The sensor meets IEC IP67, NEMA 4A, 6, 12, and DIN IP69K. Therefore, it resists dust and water in tough environments.