SICK Background Suppression Photoelectric Sensor, Barrel Sensor, 20 mm → 150 mm, PNP, IP67

Sick GR18S Series Photoelectric Sensor, 30V Maximum DC Voltage, 100mA Maximum Current - GRTB18S-P2417

This photoelectric sensor is a threaded cylindrical proximity device designed for background suppression in industrial automation. It detects objects using a visible red LED and is intended for inline sensing tasks where compact, connectorised sensors are required. The unit operates from low-voltage DC supplies and connects via a 4-pin M12 interface, making it suitable for machine integration and control systems.

Features & Benefits

• Fast response 0.5ms improves cycle time and detection accuracy
  Operates from 10VDC to 30VDC for flexible supply options
  PNP complementary output simplifies PLC interfacing
  IP67 enclosure rating enables washdown and dusty environments
  Maximum output current 100mA supports direct device switching
  Potentiometer 270° adjustment allows precise sensing range setup

Applications

• Suitable for detecting parts on conveyor systems with varying backgrounds
  Ideal for object presence checks in pick-and-place stations
  Used for material detection where axial optical alignment is required
  Suitable for integration with machine controls that accept PNP inputs
  Can be used for short-range counting and position verification tasks

What connector and wiring format does it use?

It connects via a male M12, 4-pin connector and provides PNP signalling with standard pin allocation for supply and output.

How does the sensor indicate target detection and power status?

Two LEDs are fitted: a green LED for power on and a yellow LED that lights when an object is detected.

What environmental temperature range can it tolerate in operation?

The device operates between −25°C and +55°C and may be stored between −40°C and +70°C.

How is the sensing distance adjusted for different target reflectivities?

A 270° potentiometer lets you fine-tune the switching threshold to match object reflectance and required sensing range.

Are there protections against faulty electrical conditions?

The electronics include reverse-polarity and short-circuit protection measures and outputs are safeguarded against overcurrent.