The Pepperl+Fuchs GLV18-55/73/120 is a retroreflective sensor designed for detecting objects in industrial automation applications. The numbers in the model number (GLV18-55/73/120) might indicate different variants within the GLV18-55/73/120 series with slight variations

The Operating Principle:

• Retroreflective: Uses a reflector positioned behind the object you want to detect. The sensor emits light, which bounces off the reflector and back to the sensor if an object is present interrupting the light path.

Key Features of GLV18-55/73/120:

• M18 plastic housing: Compact design suitable for various mounting options.
• Sensing range: This depends on the specific variant within the GLV18-55/73/120 model range. Refer to the datasheet for the exact range of your specific sensor model.
• DC voltage operation: Likely operates on a typical DC voltage range commonly used in industrial automation
• PNP or NPN output: Depending on the model variant, it might offer PNP or NPN output for compatibility with different control systems.

The Model Variants:

• Sensing range: As mentioned earlier, it could be between 55 mm and 120 mm with specific cutoffs depending on the model.
• Output type: PNP or NPN output systems

To get the most accurate details about your specific sensor, refer to the datasheet for the complete model number of your GLV18-55/73/120 sensor.  The Pepperl+Fuchs product page for the specific model number on the Pepperl+Fuchs website.