Chemical Feed Solutions Ltd Chemical Feed

LU74-78 EchoSwitch® Ultrasonic Level Switch & Controller

The general purpose ultrasonic level sensor provides continuous level detection up to 26.2' (8m) with 3 programmable relays for level switch or 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 (high level alarm or low level alarm) or latched on two set points for automatic fill or empty in simplex (one pump or valve), duplex (two pumps) or triplex (three pumps) 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.


26.2' (8m)


  • Offered in 3 level detection ranges from 9.8' (3m) to 26.2' (8m)
  • 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 can be used to provide local or remote level indication
  • LCD display indicates level height in engineering units and relay status
  • Narrow 2" or 3" beam width for applications with limited measurement space
  • Short 4" or 8" dead band maximizes the measureable filling capacity of the tank
  • PVDF transducer and NEMA 4X polycarbonate enclosure for corrosive liquids
  • Automatic temperature compensation for accurate measurementf
PDF Click here to download the LU80 Manual
PDF Click here to download the LU80 Quickstart
TDS Click here to download the TDS information


Chemical Feed Solutions Ltd
6a Enterprise Drive Henderson Auckland

PO Box 104-055, Lincoln North, Waitakere 0654
Phone: 09-837-6075
Fax: 09-837-6075
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Master Electricians

Chemical Feed Solutions is a member of the Electrical Contractors Association of New Zealand