Continuous Ultrasonic Level Measurement


  • Integrated display & user interface
  • Compact chemical resistant body
  • User adjustable limits & alarm points
  • Scaleable 4-20mA signal output

Ultrasonic Level Transmitters Product Description

The WL750 Ultrasonic Level Transmitters are perfect for short range, non-contact tank level measurements for a variety of liquids and solids. The Ultrasonic Level Transmitters feature an integrated LCD display and transmitter unit that provides a local level readout as well as the ability to send a signal to another device. The Ultrasonic Level Transmitters offer user-programmable settings and, in addition to the displayed values, feature an LED alarm light.

With the Ultrasonic Level Transmitter’s narrow 8 degree beam angle and slim 1.38 inches (35mm) chemical resistant process end, the WL750 is designed for accurate level measurement — even in relatively small tanks. A 3-bolt 2 ¾ inch flange is included with each Ultrasonic Level Transmitter for secure mounting. The WL750 Ultrasonic Level Transmitter’s power and signal cable assembly is connected to the display unit with a molded on, locking 5-pin plug. Choose from 16 ft (5m) or 33 ft (10m) cable assemblies, or purchase just the 5-pin plug alone to create longer cable runs.*

*NOTE: A cable assembly or 5-pin plug is required for the ultrasonic level transmitter.

Ultrasonic Level Transmitters Specifications

Ultrasonic Level Transmitter Electronics
Supply Voltage: 18 to 30 VDC
Power Consumption: < 3 Watts
Output: 4-20 mA, 2-10 V across 500 Ohm resistor to 0 V
Switching Values (S1 and S2): PNP or NPN selectable; 300 mA max load
Hysteresis: Adjustable; position depends on min. or max. setting
Display: Graphical LCD display; back-lit LED signaling lamp
Connection: M 12×1; 5-pole locking plug

Ultrasonic Level Transmitter Performance
Beam Angle: 8 degrees
Accuracy: ±0.2% full scale
Linearity Error: < 0.3% full scale
Temperature Error: 0.03% °C
Operating Temperature: 0°C to 70°C (32°F to 158°F)
Operating Pressure: Ambient

Ultrasonic Level Transmitter Mechanical
Approval: IP67, CE
Wetted Materials: PET 30% GV, epoxy resin
Housing Materials: Stainless steel, tempered glass
Mounting: 3-bolt flange with set screw for adjustment
Weight: 0.8Lbs (363g)
Dimensions: 4 inch diameter x 8.5 inch long (10cm dia. x 21.6cm long)

Ultrasonic Level Transmitters Beam Diagram
Ultrasonic Level Transmitters Wiring Diagram

Ultrasonic Level Transmitters Options

WL750-4 Ultrasonic Level Transmitter (PN# AQD004)
0.66 Ft to 4.3 Ft.  NOTE: A cable assembly or 5-pin plug is a required item.

WL750-8 Ultrasonic Level Transmitter (PN# AQD008)
0.98 Ft to 7.5 Ft.  NOTE: A cable assembly or 5-pin plug is a required item.


WL705 Ultrasonic Water Level Sensor
Specify Water Level Range: 3, 12, or 48 ft.  Includes 6 ft cable.

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.

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