• Free ground shipping in the US • Order online • Same day shipping for products ordered by 2pm EST.

SST LLC-500D3 Digital Liquid Level Sensor

SST liquid level sensor
Regular price $36.00 USD

POs or wholesale quantity discounts click here

SST Sensing's Optomax Liquid Level Sensors are switches that change state in the presence of any water-based liquid or oil. The switches are used primarily for leak detection or high or low-level liquid detection. They are not suitable for continuous level measurement.


  • Solid state, no moving parts 
  • Small in size, can be easily integration in wide range of applications
  • Ideal for leak detection
  • Fast response time
  • Can detect almost any Liquid type; oil or water based
  • Very robust permitting use in a wide range of fluids/chemicals

Models in Stock

LLC-500A3- SST Optomax Basic Liquid Level Switch. Inside mount, Polysulfone shell, M10x1 threads, -25 °C to +80°C, 3 wire simple on/off output with no logic.

LLC-500D3- SST Optomax Digital Liquid Level Switch. Inside mount, Polysulfone shell, M10x1 threads, -25 °C to +80°C, 3 wire digital output high in air.

LLC-500D3L- SST Optomax Digital Liquid Level Switch. Inside mount, Polysulfone shell, M10x1 threads, -25 °C to +80°C, 3 wire digital output low in air.

Other models not in stock - SST offers over 175 different variations of liquid level sensors. View a list of all models that can be ordered via quote. After you select a model number send us a request for quote and we will return a quote with prices. Expect 2-3 weeks for delivery.


  • Suitable for oil or liquids
  • Operating Temperature: -25C to +80C
  • Pressure: 20 bar / 209 psi Max
  • Response time: < 4s


  • Polysulfone PES
  • Dimensions: 22.7 x 10 mm
  • Internal mount with 12 mm flange
  • M10x1 thread
  • 1.5 Nm / 13.26 in-lbs max torque
  • Operating Temp: -25 to 80°C


  • 3 wire V+, 0V, output
  • 4.5V to 15.4 VDC
  • 2.5mA Max


  • 90 days - See GasLab Terms and Conditions.

Datasheet Data Sheet

Operational Guide Operational Guide

Dimensional Drawings Dimensional Drawings

reference chart Model Cross-Reference Chart. With over 175 variations, this document helps you pick the liquid level sensor that is right for your application.

reference chart All Model List. All product variations not available in stock for custom requests for quotes only. Expect 2-3 weeks for delivery.

Customer Reviews

No reviews yet

"Swift response and shipment. The product is easy to setup and use. It is just what I was looking for."

- Shima Tomohiro

Read More Reviews...