SICK GRF18S Series Level Sensor

Level detection of liquids via compact, durable optical switch. Stainless steel construction with process pressure range up to 20bar. FDA compliant, UL certified.

This model has 4 variants.
Effective August 29th, 2025 SICK has added a 9.8% surcharge for all of their products. The surcharge will appear as a separate line item on each sales order.
Part Number
  • GRF18S Series
Highlights...

Features

  • Measurement principle: optical level switch
  • Medium: fluids
  • Output signal: 1 x NPN / 1 x PNP
  • Switching mode: NO / NC
  • Process temperature: –10 to 55°C
  • Process pressure: -0.5 to 20bar
  • Process connection: G1/2
  • Wetted parts: Stainless steel 1.4404, polysulfone, FPM
  • Enclosure ratings: IP67, IP69
  • FDA compliant, UL

The SICK GRF18S Series Level Sensor is a compact optical switch notable for its extremely simple commissioning, no medium calibration required. The energetic photoelectric proximity sensor from SICK is the foundation for the sensor, with rugged and reliable construction. The stainless steel 1.4404 and polysulfone materials, as well as the IP69 enclosure rating, ensure high process reliability, even under harsh ambient conditions.  Due to the optical technology, the GRF18S is particularly well-suited for water-based media

Applications

  • Level monitoring in watery and water-based fluids
  • Dry-run protection for pumps
  • Level monitoring in rinsing units of cleaning systems