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Red rectangular plastic sensor with M12 connector and potentiometer adjuster

Wenglor

Wenglor 277.55 retro-reflex sensor 15000 mm range electrician tool

SKU CH-6B7Q-QQZWT MPN 277.55

Retro-reflex sensor detects objects up to 15000 mm using a 655 nm red laser with PNP antivalent output and IP67 housing

  • Labor warranty1 Year
  • Product typeTest Equipment
  • Color and finishRed
  • Number of items1 pack
  • Sold asBox
  • Parts warranty3 Years
  • Detects objects up to 15000 mm away
  • Laser class 2 with 655 nm red light source
  • IP67 rated plastic housing with full encapsulation
  • PNP antivalent output switches 200 mA at 3 kHz
  • Potentiometer adjustment with 10...30 V DC supply

Industrial sensing range

The Wenglor 277.55 retro-reflex sensor detects targets up to 15000 mm using a red laser at 655 nm. It is built for electricians and automation engineers who need precise presence detection in material-handling or packaging lines. The PNP antivalent output provides both normally-open and normally-closed signals from a single M12 connector.

Thermal and electrical envelope

The sensor operates from a 10...30 V DC supply and draws less than 30 mA at 24 V. Switching frequency reaches 3 kHz with a response time of 166 µs and a fixed 5 ms off-delay. Temperature drift stays below 10 % across the -10...60 °C range, and the laser is rated Class 2 under EN 60825-1 for safe use in normal ambient light up to 10000 Lux.

Build quality and daily mounting

The red plastic housing is fully encapsulated to IP67, resisting wash-down and dust ingress. A potentiometer on the body adjusts the switching point without tools. The M12 × 1, 4-pin connection simplifies cable routing in tight cabinets, while short-circuit and reverse-polarity protection guard the 200 mA output during wiring errors.

How it compares

Measured against everything we stock in Electrical Trade Tools & Kits, at today’s prices. Recalculated every night.

Price $215.99
Pricier than about 81% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameWenglor
Model name277.55
Product typeTest Equipment
Color and finishRed
In the box
Number of items1 pack

Questions about this item

How do I mount and wire the 277.55 sensor, and what alignment step is often missed?

Mount the sensor, connect the 4-pin M12 plug to a 10...30 V DC supply respecting PNP polarity, then align the red 655 nm laser spot on the RQ100BA reflector placed between 80 mm and 15000 mm; the narrow 0,6 ° opening angle makes precise aiming critical.

What component will need replacement first during long-term use?

The laser light source is rated for 100000 h at 25 °C; after that the emitter degrades and the sensor must be replaced.

What limit appears first when the sensor runs continuously at high speed?

At the maximum 3 kHz switching frequency the 166 µs response time and fixed 5 ms off-delay become the bottleneck, preventing faster cyclic operation.

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