The general purpose ultrasonic transmitter provides continuous level measurement up to 32.8’ (10m) with a 4-20 mA signal output, and is configured via our free WebCal software. This non-contact liquid level sensor is ideally suited for corrosive, sticky or waste liquids, and is selected for bulk storage, tanker truck, day tank, process tank, waste sump, neutralization tank, open channel, chemical feed and clarifier applications.


  • Offered in 4 measurement ranges from 9.8’ (3m) to 32.8’ (10m)
  • Configuration is fast and easy via WebCal software and USB adapter
  • Narrow 2” or 3” beam width for applications with limited measurement space
  • Short 4” or 8” dead band maximizes the measurable filling capacity of the tank
  • PVDF transducer and 6P polycarbonate enclosure for corrosive liquids
  • Automatic temperature compensation for accurate measurement


P/N Description From
LU23-00 5.5m (18.0′) range, 2″ NPT, w/o Fob $635.00
LU23-01 5.5m (18.0′) range, 2″ NPT, w/Fob $680.00
LU23-10 5.5m (18.0′) range, 2″ G, w/o Fob $640.00
LU23-11 5.5m (18.0′) range, 2″ G, w/Fob $685.00
LU27-00 3m (9.8′) range, 1″ NPT, w/o Fob $535.00
LU27-01 3m (9.8′) range, 1″ NPT, w/Fob $580.00
LU27-10 3m (9.8′) range, 1″ G, w/o Fob $540.00
LU27-11 3m (9.8′) range, 1″ G, w/Fob $585.00
LU28-00 8m (26.2′) range, 2″ NPT, w/o Fob $735.00
LU28-01 8m (26,2′) range, 2″ NPT, w/Fob $780.00
LU28-10 8m (26.2′) range, 2″ G, w/o Fob $740.00
LU28-11 8m (26.2′) range, 2″ G, w/Fob $785.00
LU29-00 10m (32.8′) range, 2″ NPT, w/o Fob $835.00
LU29-01 10m (32.8′) range, 2″ NPT, w/Fob $880.00
LU29-10 10m (32.8′) range, 2″ G, w/o Fob $840.00
LU29-11 10m (32.8′) range, 2″ G, w/Fob $885.00


WebCal software is a PC utility program that enables users to easily configure and test compatible Flowline level sensors to their measurement and control requirements. Download your free copy.



Range: LU27: 4” to 9.8’ (10cm to 3m), LU23: 8” to 18.0’ (20cm to 5.5m), LU28: 8” to 26.2’ (20cm to 8m), LU29: 8” to 32.8’ (20cm to 10m)

Accuracy: ± 0.2% of range

Resolution: LU27: 0.019” (0.5mm), LU23: 0.039” (1mm), LU28/29: 0.079” (2mm)

Dead band: LU27: 4” (10cm), LU23/28/29: 8” (20cm)

Beam width: LU27: 2” (5cm), LU23/28/29: 3” (7.6cm)

Configuration: WebCal™ PC, Windows®, USB 2.0

Memory: Non-volatile

Supply voltage: 24 VDC (loop)

Consumption: 0.5W

Loop resist.: 500 ohms @ 24 VDC

Signal output: 4-20 mA, two-wire

Signal invert: 4-20 mA or 20-4 mA

Signal fail-safe: 4 mA, 20 mA, 21 mA, 22 mA or hold last

Process temp.: F: -4º to 140º, C: -20º to 60º

Temp. comp.: Automatic

Ambient temp.: F: -31º to 140º, C: -35º to 60º

Pressure: MWP = 30 PSI (2 bar)

Enclosure rating: Type 6P, encapsulated, corrosion resistant & submersible

Encl. material: Polycarbonate

Trans. material: PVDF

Cable jacket mat: Polyurethane

Cable type: 4-conductor, shielded

Cable length: 10’ (3m)

Process mount: LU27: 1” NPT (1” G), LU23/28/29: 2” NPT (2” G)

Mount gasket: Viton®

Classification: General purpose

Compliance: CE, RoHS

Approvals: cFMus


If you want help in selecting a sensor for your application, please submit a Level Questionnaire. An engineer will review your requirements and suggest a product solution via email.