Optical Liquid Level Switches

SST supplies optical liquid level switches and industrial liquid level sensors for reliable point-level detection, liquid presence monitoring and leak detection across industrial, commercial and OEM equipment. These solid-state sensors detect whether liquid is present without moving parts. They provide fast and repeatable switching for tanks, reservoirs, pipes, sumps and fluid-handling systems.

The range includes compact sensors for general industrial use, chemically resistant switches, glass-tip sensors, hazardous-area-approved models and specialist sensors for data center liquid-cooling systems. Depending on the model, the sensors can detect water-based fluids, oils, coolants, hydrocarbons and other compatible liquids.

Data center cooling optical liquid level sensor with stainless steel housing and polysulfone sensing tip
Optical Liquid Level Switch – Data Center Cooling Series
Data-Center coolant level monitoring
Fast, maintenance-free optical sensing
Ideal for CDUs and immersion cooling
POS Glass Tip liquid level switch with stainless steel and glass tip
LLHT Glass Tip
Designed for applications requiring a robust metal housing and a wide operating temperature range
Reverse polarity, ESD, transient over-voltage and short circuit protected
Wide range of mechanical and electrical options
Robust LLHP liquid level switch with large mounting threads
LLHP
Designed for applications requiring a robust metal housing and larger threads for external mounting
Reverse polarity, ESD and transient over-voltage protected
Wide range of mechanical and electrical options
LLC Series Liquid Level Switches
LLC Series – Honeywell Alternative
Reliable, compact solid-state liquid level switches
Detects oil- and water-based liquids
Wide range of mechanical and electrical options
LLIS – Hazardous Area Approved
ATEX, UKCA and IECEx certified
Ambient and liquid temperature -30°C...+80°C (-22°F...+176°F)
Wide range of mechanical and electrical options
Optomax Digital liquid level switch—miniature, low-power optical sensor
Optomax Digital Range
Reliable, compact solid-state liquid level switches
Reverse polarity, ESD and transient over-voltage protected
Wide range of mechanical and electrical options
Optomax Basic Fluid Level Switch with Polysulfone housing
Optomax Basic Range
Optics only solution
3 wire (common cathode/emitter) and 4-wire (galvanically isolated) version available
Wide range of mechanical and electrical options
SST Liquid Level Sensors
Optomax Industrial Glass
Reliable, compact solid-state liquid level switches
Reverse polarity, ESD, transient over-voltage and short circuit protected
N and P type output configurations, capable of sinking or sourcing up to 200mA, can directly drive small loads
Optomax Industrial Liquid Level Switch with stainless steel housing and borosilicate glass sensing tip
Industrial Liquid Level Switch – Optomax Industrial Range
Reverse polarity ESD, transient over-voltage and short circuit protected
Wide supply voltage ranges
N and P type output configurations, capable of sinking or sourcing up to 200mA, can directly drive small loads

Frequently Asked Questions

Optical liquid level switches for industrial and OEM applications

SST optical liquid level switches are designed for applications where dependable liquid detection is essential. They can be used for high- and low-level alarms, pump protection, dry-run prevention, leak detection, fluid presence monitoring and automatic process control.

The product range includes:

  • Liquid level switches for industrial tanks and reservoirs
  • Optical sensors for coolant and water-glycol monitoring
  • Level switches for leak detection trays and containment systems
  • Compact sensors for OEM equipment and instrumentation
  • Chemical-resistant sensors for demanding liquid media
  • Hazardous-area-approved liquid level switches
  • Glass-tip sensors for specialist applications
  • Custom Sensor Solutions with application-specific housings, cables and connectors

These sensors exhibit low sensitivity to ambient light and are unaffected by foam in air or small bubbles in liquid. They are engineered to operate in wide temperature ranges and withstand harsh liquid media, ensuring robust, long-lasting functionality even in challenging conditions.

If our standard switches don’t meet your needs, we provide customization options for housings, cabling, and connectors to suit your specific applications. Additionally, bespoke features such as PWM outputs or insensitivity to moving liquids can be integrated, delivering a solution tailored to your unique requirements.

Explore our custom liquid level sensor solutions.

 

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