gems sensors & controls | level sensing techniques

GEMS™ SENSORS & CONTROLS

Website: www.GemsSensors.com Call : 1-800-378-1600

LIQUID LEVEL SENSING TECHNOLOGIES

http://www.gemssensors.com/

VARIOUS TECHNOLOGIES…..


Each of today’s liquid level sensing technologies excels in various roles and primarily includes the following types:

• Float or Buoyancy • Pressure• Conductivity • Load Cells• Capacitance • Piezo Resonant• Ultrasonic • Optical


FLOAT/BUOYANCY


Pros: Non-powered, proven, direct indicationCons: Invasive, contact fluids, moving partsTypical Applications: Water Tanks, saline, buffer, and reagent bottle content monitoring

CONDUCTIVITYPros: No moving parts, low costCons: Invasive, probe erosion, liquid needs to be conductiveTypical Applications: Boiler water, reagent monitoring


CAPACITANCE


Pros: No moving parts, can be non-invasive, accurateCons: Continuous calibration, needs resistive liquidsTypical Applications: Reagent, waste, and wash container levels

ULTRASONICPros: No moving parts, small, accurateCons: Expensive, invasiveTypical Applications: Large process tanks pharmaceutical


PIEZO-RESONANT


Pros: Non-invasive/non-contact, accurate, repeatable, and economicalCons: Powered, works only with plastic containers, wall thickness, temperature limitationsTypical Applications: Reagents, waste, diluents, wash, saline, pure water

ExOsense Piezo-Resonant Sensor


http://www.gemssensors.com/Products/Level/Single-Point-Level-Switches/Piezo-Resonant-ExOsense




ELECTRO-OPTICAL


Pros: Compact, no moving parts, high temperature capabilityCons: Invasive, powered, and can be affected by dry or coating mediaTypical Applications: Reagents, waste, dialysate, detergent/wash, and coolant


ELECTRO-OPTIC OPERATING PRINCIPLE


•Contains an infrared LED and a light receiver•Light from the LED is directed into a prism which forms the tip of the sensor

•With no liquid, light from the LED is reflected within the prism to the receiver•When liquid immerses the prism, the light is refracted out into the liquid, leaving little or no light to reach the receiver•Sensing this change, the receiver actuates electronic switching within the unit to operate an external alarm or control circuit


FOR INQUIRIES

Website: www.GemsSensors.comPhone: 1-860-747-3000 | Fax: 860-747-4244Email: [email protected]: Gems Sensors & Control, One Cowles Road, Plainville, CT 06062-1198

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