More information about how a Level sensor works in this link.
The three-wire ultrasonic level transmitter is the compact solution for non-contact continuous level measurement in process vessels, storage tanks and open channels. The transmitter also features a built-in 10A relay which can be configured as an alarm on a single set point or latched on two different set points for automatic fill or empty operations. Industrial and municipal liquid examples include sodium hydroxide, wastewater, resin, wax, liquor and bleach. An ultrasonic sound wave is pulsed eight times per second from the base of the transducer. The sound wave reflects against the process medium below and returns to the transducer. The microprocessor based electronics measure the time of flight between the sound generation and receipt, and translates this figure into the distance between the transmitter and process medium below. The surface of the level being measured must be free of fumes, vapors, foam and the surface must be flat; the signal may be lost if any of these conditions are present.
SPECIFICATIONS Range: 0.5 to 24.5 feet Accuracy: ± 0.25% of span Resolution: 0.125” (3 mm) Frequency: 50 kHz Pulse rate: 8 pulses/second Blocking distance: 6" minimum Display type: 4 segment LED Display units: Inch / cm Supply voltage: 14-36 Vdc Consumption: 200 mA Current flow: Source / sink Signal output: 4-20 mA, 12-36 Vdc Signal averaging: Fast / slow Calibration: Push button Relay current: 10 amp Relay output: 250 VAC, 10A, 1/2 hp, SPDT Relay indication: ON / OFF status Contact resistance: 30 milli½ Fail-safe diagnostic: Relay reverts to safe position Temperature rating: -40 to 60°C, (-40 to 140°F) Temp. compensation: Automatic over entire range Pressure rating: 30 psi @ 25 °C., derated @1.667 psi per °C. above 25 °C. Enclosure rating: NEMA 4X / IP65 Enclosure material: Polypropylene Transducer material: PVDF Mounting threads: 2" NPT (4" female with “-S” option)
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† All amounts shown in EUR, GBP, or USD Note: For Hygienic Option add “-S” to model number and contact sales for additional price.
CE approval complies with EN50082-2 immunity, EN55011 emission and EN 61010-1 safety standards.
The sourcing transmitter provides internal 4-20 mA excitation and should be used with a sinking device. The transmitter with sinking output requires external excitation or should be used with a sourcing device, such as the LVCN-51-CE continuous relay controller. Ordering Example: (1) LVU-303 Ultrasonic, three-wire transmitter, sourcing (4-20 mA), £805.00