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Integrated Ultrasonic Level Transmitter

  • Non-contact ultrasonic measurement for liquids and solids

  • Integrated design for easy installation and maintenance

  • High measurement resolution, better than 1 mm

  • Fast response time, as quick as 2 seconds

  • Automatic temperature compensation for improved accuracy

  • Echo curve display for on-site monitoring and commissioning

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FK-WSU180 Integrated Ultrasonic Level Transmitter

  • Product overview

The compact ultrasonic level transmitter is a non-contact, highly reliable, and cost-effective instrument for continuous level and distance measurement of liquids and bulk materials. With its integrated structure, the sensor and display unit are housed in a single enclosure, simplifying installation and reducing wiring complexity.

The instrument is easy to install and maintain, with no direct contact with the measured medium. It is widely used in typical industrial environments such as municipal systems, chemical processing, storage and transportation facilities, and other applications including rivers, tanks, reservoirs, and silos.

 

  • Key Features

Rich Chinese and English menu interface with simple operation

Built-in fault self-diagnosis for real-time status monitoring

Multiple measurement algorithms selectable for different working conditions

High measurement resolution, better than 1 mm

Fast response, with minimum response time of 2 seconds

Automatic temperature compensation, correcting sound velocity variations

Echo curve display for real-time monitoring and on-site debugging

 

  • Measuring principle

Ultrasonic level measurement is based on the reflection of ultrasonic waves at the interface between media with different densities, such as air and liquid or solid materials.

The ultrasonic transducer emits ultrasonic pulses toward the target surface. When the sound waves encounter the surface of the liquid or material, they are reflected back and received by the transducer. The instrument calculates the distance by measuring the transmission time of the ultrasonic signal.

Using the known speed of sound in air, the level or distance is accurately calculated.

Measurement parameters:

  • BD – Blind distance

  • H – Installation height

  • F – Measuring range

  • D – Distance from transducer surface to material surface

  • L – Level

FK-WSU180 Integrated Ultrasonic Level Transmitter

Note:
For liquid level measurement, the installation height and measurement mode must be configured via the menu.
Liquid level = Installation height − Measured distance.

  • Technical Specifications

Performance
Measured Variable Level / Object level
Measuring Range 0–5 m / 0–10 m
Dead Zone 5 m range: ≤ 0.3 m
10 m range: ≤ 0.4 m
Accuracy ±0.5% FS
Resolution 1 mm or 0.1% FS (whichever is greater)
Ingress Protection Instrument: IP65
Sensor/Probe: IP68
Output
Analog Output 4–20 mA, current output accuracy 0.2% FS
Two-wire:
Load resistance RL = (U − 18 V) / 0.02 A, where U is the supply voltage
Four-wire:
Load resistance RL = (U − 14 V) / 0.02 A, where U is the supply voltage
Alarm Output 2× SPST relays (optional for four-wire type)
Contact rating: 250 VAC, 3 A
Communication Output RS485 (optional for four-wire type),Modbus-RTU protocol
Power Supply
Supply Voltage 18–28 VDC
Power Consumption Two-wire type Maximum power consumption: 0.48 W
Four-wire type No relay, no analog output: max. 0.4 W
1 relay ON, no analog output: max. 0.5 W
2 relays ON, no analog output: max. 0.7 W
No relay, with analog output: max. 0.8 W
1 relay ON, with analog output: max. 0.9 W
2 relays ON, with analog output: max. 1.1 W
Electrical Connection M20 × 1.5
Process Conditions
Process Pressure 0.3 MPa
Ambient Conditions
Operating Temperature Instrument: −20 to 60 °C
Sensor/Probe: −20 to 80 °C
Storage Temperature −20 to 80 °C
Humidity 10% to 85% RH

  • Applications

The integrated ultrasonic level meter is suitable for non-contact level and distance measurement in various applications, including:

Municipal & Water Management
Rivers, reservoirs, channels, and water storage facilities

Chemical Industry
Liquid tanks, process vessels, and storage containers

Storage & Transportation
Storage tanks, silos, and bulk material containers

Industrial Process Control
Level monitoring in production and auxiliary systems

Solid Material Level Measurement
Silos, bins, and hoppers containing powders or granules

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