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EchoSwitch LU74/77/78 Ultrasonic Level Switch
Brand: FlowlineThe general-purpose ultrasonic level sensor provides continuous level detection up to 26.2 feet (8 meters) with 3 programmable relays for level switch or level control functions, and a 4-20 mA 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.
Specifications
Brand
Accuracy
- ± 0.2 % of Span
Alarm
- High
- Low
Ambient Temperature Range
- -40° to 71° C (-40° to 160° F)
Approvals & Certifications
- CE
- RoHS
BSP Connection
- G 1” Male - LU77
- G 2” Male - LU74/78
Conduit Connection
- Dual, 1/2” NPT
Configuration
- Push Button
Current
- Signal Fail-safe: 4-21 mA or Hold Last
Deadband
- LU74 / 78: 8” (203.2 mm)
- LU77: 4” (101.6 mm)
Display
- 6-Character LCD
Electrical Contacts
- Normally Open
Electrical Rating
- 2 A at 30 Vdc
- 220 Vdc
- 250 Vac
- 60 W(DC), 125 VA
Enclosure, Body Material
- Brass
- Polycarbonate
- Stainless Steel
Environmental Protection
- IP65
- IP66
- NEMA 4X
Excitation Voltage
- Signal Excitation: 12-28 Vdc
Gasket Material
- Mount Gasket: Viton
Indication
- LCD Display
- Level & Relay Status
Loop Resistance
- 500 ohms at 24 Vdc
Materials of Construction
- Transducer Material: PVDF
Media
- Liquids: Corrosive, Sticky or Dirty Liquids
NPT Connection
- 1” NPT Male - LU77
- 2” NPT Male - LU74/78
Operating Pressure
- psi: 30 (kPa: 200, bar: 2) - Max.
Output
- 4-20 mA, 2-Wire, Isolated, Sinking
Power
- 20 W at 120 Vac
Process Temperature
- -20° to 60° C (-4° to 140° F)
Range
- 4” to 26.2 feet (10 cm to 8 metres)
Repeatability
- 0.25” (6.35 mm)
Sensor, Probe Style
- Ultrasonic
Supply Voltage
- 95-250 Vac
Switch Type
- SPDT
- SPST
- Day Tank Level Applications
- Pump Lift Station
- Sumps