SICK Background Suppression Photoelectric Sensor, Barrel Sensor, 3 mm → 300 mm, PNP, IP67, IP68, IP69K

Sick GR18 Inox Series Photoelectric Sensor, 30V Maximum DC Voltage, 100mA Maximum Current - GRTB18-P2412V

This photoelectric sensor is a cylindrical background-suppression device designed for industrial sensing in hygienic and washdown zones. It detects objects using a visible red pin-point LED and interfaces via a 4-pin M12 connector, offering a compact, thread-mount form for integration into machine control and automation systems.

Features & Benefits

• PNP output with complementary function enabling versatile switching behaviour
  Fast response time 500μs supporting high-speed detection tasks
  Operating voltage range 10V to 30V allowing broad plant compatibility
  Protection rating IP67 IP68 IP69K for washdown and immersion resistance
  Ambient operating range −25°C to +55°C suitable for warmer process areas
  Output current up to 100mA for direct drive of control inputs

Applications

• Suitable for presence detection on conveyors in food processing environments
  Ideal for object sorting where background suppression is required
  used with PLC inputs in machine Vision pre-trigger systems
  Can be used for level sensing of stacked pallets and containers
  Suitable for integration into hygienic machinery requiring frequent washdowns

How is the sensing range adjusted on the unit?

The sensing distance is set using an on-device potentiometer with 270° travel to tune detection across the device’s operating span.

What indicators help confirm correct operation during commissioning?

A green LED shows power status while a yellow LED indicates the received light beam status and object detection.

How does the device tolerate aggressive cleaning procedures?

The stainless-steel V4A housing and PMMA optics provide resistance to many chemical cleaners, and the enclosure meets IP69K for high-pressure washdown
however certain agents such as lactic acid and hydrogen peroxide are not compatible.

What electrical protections are included against wiring faults?

The circuitry incorporates reverse-polarity protection on supply and I/O and overcurrent/short-circuit protection for outputs to safeguard connections.

What mounting and connection provisions are supplied?

The sensor is thread-mounted with two stainless-steel fastening nuts and connects via a straight male M12, 4-pin connector.

Notes

Product details cover the whole product family. For details on the specifications for this individual product, please refer to the datasheet.