All Technologies
OPTICAL
Optical
Infrared point-level sensing with no moving parts
OPTICALOptical
Infrared point-level sensing with no moving parts
SMD's optical liquid level sensors use infrared light refraction through a polished prism tip to detect the presence or absence of liquid at a precise point. When the prism is dry, total internal reflection returns light to the detector — when wetted, the refractive index changes and the signal drops. The result is a fast, reliable switch with no moving parts, no calibration, and no sensitivity to foam or turbulence.
Key Benefits
- No moving parts — extremely long service life
- No calibration required after installation
- Immune to foam, bubbles, and turbulence
- Ideal for water, saline, and aqueous solutions
- Compact prism tip fits tight OEM spaces
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