Product Line
Optical Liquid Level Sensors
The OS Series uses infrared light refraction through a polished prism tip for precise point-level sensing of water and most liquids. No moving parts, no calibration required after installation, rated up to 250 PSIG. Immune to foam, bubbles, and turbulence.
Featured Model
Model OS2
Digital Optical Liquid Level Sensor
An infrared LED shines into a polished prism tip — when dry, total internal reflection returns light to the photodiode and the output holds. When the prism contacts liquid, the refractive index change breaks total internal reflection and the output switches instantly. No mechanical wear, reliable over millions of wet/dry cycles, up to 250 PSIG.
Output
Switched digital
Pressure
Up to 250 PSIG
Design
Prism tip, no moving parts
Markets
Medical · Lab · Industrial
Industries Served
Where our optical sensors are used
Medical Devices
Reservoir detection, reagent cartridges, ink cartridges
Laboratory
Analytical instruments, sample prep, liquid handling
Industrial
Tank full/empty detection, harsh chemical environments
Diagnostics
Hematology, immunoassay, point-of-care analyzers
Fluid Management
Reagent bottles, IV fluid monitoring, waste detection
Life Science
Bioreactor level detection, media management
Semiconductor
Chemical mechanical planarization, slurry management
Consumer & Industrial
Printer cartridges, appliance water sensors
Choosing the Right Sensor
Which optical level sensor is right for your application?
OS Series models differ primarily in housing size, pressure rating, and construction material. Use these starting points — or contact our engineering team.
If you need
Standard digital point-level detection
Start with
OS2
LED/photodiode prism, switched digital output, up to 250 PSIG. The standard OEM workhorse.
If you need
Low power or compact OEM packaging
Start with
OS3
Low power dry/wet state output, compact form for reagent bottles and reservoir OEM designs.
If you need
High-temperature or extended service
Start with
OS5
Extended temperature range version for process monitoring applications.
If you need
Harsh chemicals or corrosive fluids
Start with
OS4 / OS7
Stainless steel or Ryton construction for chemical resistance in industrial and food environments.
Optical Liquid Level Sensor Models
| Model | Name | Switch Type | Supply Voltage | Supply Current | Max Temp | Max Pressure | Housing | ||
|---|---|---|---|---|---|---|---|---|---|
 | OS2 | Digital Optical Level Sensor | Current Sink | 15.4 VDC | 2.5 mA | 125°C | 100 psi | Polysulfone (C) or Trogamid (T); types 1, 2, 3, 5, 6, 7 | View Product |
| OS3 | Industrial Optical Level Switch | 001/002/003/004 | Blank or 24 VDC | — | — | — | Polysulfone (C) or Trogamid (T); types 2, 6, 7; 1.326 × 1 × 1 in, 0.23 lbs | View Product |
 | OS4 | Industrial Glass Optical Level Switch | 003/004 | Blank or 24 VDC | — | — | — | Types 2, 6, 7, 8; 1.2 × 1.6 × 1.2 in, 0.45 lbs; Termination: Blank or D | View Product |
| OS5 | Basic Optical Liquid Level Switch | 4 mA | 3.3 to 24 VDC | 10 mA | 80°C | 100 psi | Compact OEM packaging | View Product |
| OS6 | POS Glass Tip Optical Sensor | 200 mA | 30 VDC | 200 mA | 140°C | 1160 psi | Industrial glass tip, high-temperature and high-pressure rating | View Product |
| OS7 | High Performance Optical Liquid Level | 200 mA | 30 VDC | 200 mA | 140°C | 363 psi | High performance, chemically resistant construction | View Product |