Non-Contact Water Level Measurement



  • Long range, short dead band
  • Unaffected by optical factors like color and transparency
  • 4-20 ma Transmitter
  • Durable sealed housing for wet or dirty applications
  • For monitoring water level in tanks and open channel

Ultrasonic Water Level Sensor Product Description

The WL705 Ultrasonic Water Level Sensor uses the latest ultrasonic distance measuring technology for accurate non-contact water level monitoring. The ultrasonic water level sensors contain a rugged transducer in a stainless steel sealed housing for long life and provides an industry standard 4-20 mA output. There are three ultrasonic water level sensor ranges available including 3 ft, 12 ft, and 48 ft to meet a wide variety of applications. The unique 3 ft range ultrasonic water level sensor is ideal for measuring flow in small flumes and weirs. The 12 ft and 48 ft ultrasonic water level sensor ranges are best for measuring river, lake and tank levels and for measuring open channel flow in larger flumes. Ultrasonic water level sensor installation is simple and requires no programming or calibration. No maintenance is required for the ultrasonic water level sensors.

The WL705 Ultrasonic Level Sensors are rugged, reliable and completely weatherproof.  The ultrasonic water level sensors are ideal for sewer or wastewater applications.  The ultrasonic water level sensors are easy to mount, come with a 6 ft standard cable and complete instructions.  The ultrasonic water level sensors are easy to interface to all PLC’s, SCADA and telemetry systems with its simple 3-wire 4-20 mA output.  The WL705 Ultrasonic Water Level Sensor is compatible and provided optionally with the Global Water FC220 Open Channel Flow Monitor and the PC320 Process Controller (for water level control).

Ultrasonic Water Level Sensor Specifications

Ranges: 0.33 to 3 ft; 0.33 to 12 ft; and 1 to 48 ft
Resolution: 0.009 in, 0.035 in, and 0.141 in
Repeatability: Greater of ±0.03 inches (0.76 mm) or 0.1% of range @ constant temperature
Accuracy: Better than 0.5% of range @ constant temperature; affected by temperature gradients, target echo strength, and speed of sound in vapors
Transducer Type: Ruggedized piezoelectric
Beam Angle: 12° conical shaped pattern
     3 and 12 ft rng: 10 to 30 VDC @70 mA max
     48 ft range: 10 to 30 VDC @40 mA max
Output: 4-20 mA (4 mA is minimum water level and 20 mA is maximum water level)
Update Rate: 50 ms
Warm Up Time: 15 seconds
Operating Temperature Range: -40° to 158°F (-40° to 70°C)
Humidity: 0-100% (avoid heavy condensation)
Housing Material: 303 stainless steel
     3 and 12 ft rng: 30×1.5 mm threaded housing
     48 ft range: 2.5 inch Male NPT threads
     3 and 12 ft rng: 4.062 in. long x 1.05 in. dia. (103.2 L x 26.7 Dia mm)
     48 ft range: 4.75 inch long x 2.375 inch dia. (121 L x 60 Dia mm)
     3 and 12 ft rng: 12.7 oz (0.36 g)
     48 ft range: 25.9 oz (0.73 kg)
IP rating: IP 68, Nema 4X
Certifications: CE

Ultrasonic Water Level Sensor Options

WL705-003 Ultrasonic Water Level Sensor (PN# AQS003)
Water Level Range: 3 ft.  Includes 6 ft cable.

WL705-012 Ultrasonic Water Level Sensor (PN# AQS012)
Water Level Range: 12 ft.  Includes 6 ft cable.

WL705-048 Ultrasonic Water Level Sensor (PN# AQS048)
Water Level Range: 48 ft.  Includes 6 ft cable.

Extra Cable (PN# 01-842)
Standard ultrasonic water level sensors include 6 ft of cable, but can be purchased with up to 500 ft of cable.


WL750 Ultrasonic Level Transmitter
Includes integrated display and user interface.

WL400 Water Level Sensor
When ordering, specify water level range that will cover the maximum water level change for your application (this is not necessarily the total depth of water): 0-3, 0-15, 0-30, 0-60, 0-120, 0-250, 0-500 ft.  Selecting the smallest water level range possible will ensure the greatest accuracy.  Includes 25 feet of cable.

FC220 Open Channel Flow Monitor
Includes total and flow rate display with multiple relay outputs.

PC320 Process Controller
Process control meter and industrial control system.

WL16 Water Level Logger
Submersible pressure transducer and datalogger for recording water level data.

DCX-22-2 Self Contained Water Level Datalogger