Optical fluid level indicator

Optical gauge

Optical level measurement device and method

Optical liquid level sensor and discriminator

Optical material level probe

Optical monitoring system

Optical multiphase flowmeter

Optical point level sensor with lens

Optical self-checking level detector

Optical switch

Optical volume sensor

Optical-electrical apparatus for detecting the presence of a...

Optical-electrical liquid probe

Optically powered sensor arrangements

Optoelectronic motion and fluid flow sensor

Optoeletronic device for meter optical detector module

Orifice fitting with venting passage and injection seal

Orifice meter

Orifice meter with isolation chamber seal on the orifice...

Orifice meter with pressure venting and equalizing safety...