EchoSwitch LU74-78 Ultrasonic Level Switch



  • Simplex, duplex & triplex options
  • Integrated timer for pump/valve
  • NEMA 4X rated enclosure

EchoSwitch LU74-78 Ultrasonic Level Switch

The EchoSwitch LU74 through to LU78 Series from Flowline, is a general-purpose ultrasonic level sensor. This level switch provides continuous level detection up to 26.2’ (8m), has 3 programmable relays for level switch or level control functions, and a 4-20mA signal output.

The Flowline EchoSwitch features digital push button configuration, eliminating target calibration. Each relay can be configured on a single set point to control pumps, valves, or alarms. In addition, all 3 relays can be simplexed, duplexed or triplexed.

​EchoSwitch II now features an integrated timer with pump/valve delay and timed pump alternation. The switch is well suited for a broad range of corrosive, waste and slurry type media and is broadly selected for atmospheric day tanks, pump lift stations and waste sump applications.

Features of the EchoSwitch LU7 Ultrasonic Level Switch include:

  • Simple digital push configuration, no more target calibration
  • Available in 2.5m or 7.5m range
  • 10cm miniature dead band optimises the filling capacity of sumps or vessels.


Manufacturer: Flowline

Liquid: Corrosive, Wastewater, Slurry

Media Type: Liquids

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Product Specification

Multi-Point Ultrasonic Level Switch and Controller. The ideal float switch replacement providing non-contact level detection up to 7.5m with 3 relays for advanced pump, valve and alarm automation functions


Specification Detail of the EchoSwitch LU7 Ultrasonic Level Switch:


10cm to 8m (4″ to 26.2″)

Material Body


Beam Width

5cm – 7.6cm (4″ to 8″)


Non volatile

Operating Temp Range

-20 to 60°C

Pressure Range

Up to 2 bar


Push button

Contact Type

(3) SPDT relays

Fluid Type


Applicable Liquids

Corrosive, sticky or dirty liquids

Supply Voltage

LU7_-50_5: 95-250 VAC


Ce, RoHS


General Purpose