Ultrasonic level switch EchoSwitch® LU74-78 series

for liquidsfor tanksplastic

The general purpose ultrasonic level sensor provides continuous level detection up to 26.2’ (8m) with 3 programmable relays for level switch or level control functions, and a 4-20mA signal output. The sensor is programmed via the integral push button display module. Each relay can be configured on a single set point alarm or latched on two set points for automatic fill or empty in simplex, duplex or triplex level control modes with selectable time delay and fail-safe logic. The embedded level controller can lower cost by replacing external control hardware. This non-contact liquid level sensor is ideally suited for corrosive, sticky or dirty liquids, and is broadly selected for pump lift station, sump and day tank level applications. FEATURES Configuration is simple via integral push button display module Three programmable relays for switch, pump control and fail-safety 1 pump or valve with 2 alarms 2 pumps lead-lag with 1 alarm 2 pumps duplexing with 1 alarm 3 independent switch point alarms 4-20 mA output provides local or remote process level monitoring LCD display indicates level height in engineering units and relay status Narrow 2” or 3” beam width for applications with limited space Short 4” or 8” dead band maximizes the filling capacity of the tank PVDF transducer and NEMA 4X PC enclosure for corrosive liquids Automatic temperature compensation for accurate measurement Repeatability: 0.25” (6.35mm) Signal excitation: 12 to 28 VDC Loop resist: 500 Ohms @ 24 VDC Dead band: LU77: 4” (10cm), LU74/78: 8” (20cm) Beam width: LU77: 2” (5cm), LU74/78: 3” (7.6 cm) Configuration: Push button Memory: Non-volatile Display type: LCD, 6 characters