WENGLOR HT77PA3

wenglor HT77PA3 Photoelectric Sensor

Description

The wenglor HT77PA3 is a high-performance photoelectric sensor designed for reliable object detection in industrial automation. It features adjustable background suppression, allowing it to accurately detect objects up to 2000 mm away while ignoring any surfaces beyond the setpoint. This makes it ideal for applications on conveyor belts or in complex machinery where background interference is a concern.

Specifications

• Manufacturer: wenglor
• Model: HT77PA3
• Sensing Principle: Photoelectric with Background Suppression
• Working Range: 30 to 2000 mm
• Supply Voltage: 10 to 30 V DC
• Switching Output: PNP, NO/NC switchable
• Connection: 4-pin M12 Connector
• Light Source: Red Light
• Housing Material: Plastic

Label Info

• Type: HT77PA3
• Voltage (U): 10…30 V DC
• Current (Ie): < 100 mA

Application

This sensor is commonly used in packaging, logistics, assembly lines, and material handling systems for presence detection, counting, and positioning tasks.

Country of Origin

Made in Germany.

CO2 Impact

By purchasing this pre-owned sensor, you contribute to a circular economy and help avoid approximately 6.0 kg of CO2 emissions associated with the production of a new unit.

Availability

This item is in stock and ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

Question?
How do I adjust the sensitivity and switching distance on the HT77PA3?

Answer

The HT77PA3 features two potentiometers. The top potentiometer adjusts the switching distance. The bottom one, if applicable to the specific mode, adjusts sensitivity or light/dark switching. Refer to the product manual for the precise adjustment procedure for your application.

Question?
What is the difference between a standard reflex sensor and one with background suppression like the HT77PA3?

Answer

A standard reflex sensor detects any object that reflects its light back. A sensor with background suppression, like the HT77PA3, uses triangulation to only detect objects within a set distance, ignoring any reflective surfaces or objects in the background beyond that point. This makes it much more reliable in complex environments.

Question?
Is the PNP output of the HT77PA3 configurable as Normally Open (NO) or Normally Closed (NC)?

Answer

Yes, the PNP output on the HT77PA3 is switchable between Normally Open (light switching) and Normally Closed (dark switching) modes. This is typically configured using one of the adjustment potentiometers or a control wire, depending on the specific product version.

Last Update: Friday, March 13, 2026

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