AW-Lake’s Water Inline Ultrasonic Flow Meter was designed to accurately measure the flow of water and water glycol solutions in small pipes from ½” – 2½” in diameter. The no-moving-parts design operates over a wide flow range with excellent low flow accuracy. The low-cost design is provided with threaded process connections, a 4-20mA analog output and a scaled dry contact pulse output for totalization, as well as Modbus RTU. Units are available with and without a detachable LCD display, which can be mounted up to 5 feet away from the flow meter body for convenience.


• Reliable No-Moving-Parts Design for Long Term Reliability
• High Accuracy Over a Wide Flow Range: ±1% of Reading over Normal Range (25:1), ±2% of Reading over Extended Range (100:1)
• User-Friendly Backlit Display and User Interface
• Detachable Display for Remote Mount Installation up to 5 Feet from the Sensor Body
• Built-In Interval Data Logger for Easy Data Access via Modbus
• ANSI/NSF 61 & 372 Approval

Reliable No-Moving-Parts Design

The Water Inline Ultrasonic meter incorporates a pair of wetted ultrasonic transducers that face each other directly in the flow tube. This configuration maximizes signal strength and
long-term reliability.

Highly Accurate Over a Wide Flow Range

The flow tube design and direct beam path configuration is optimized for water and water/glycol solutions. This allows for improved accuracy at low flows.

Industrial Automation Protocol

The LCD Display version comes standard with Modbus RTU communications for instantaneous flow rate, volume total, run hours, and diagnostic information.

Easy to Install in Limited Straight Runs

The Water Inline Ultrasonic meter has an innovative flow tube design that simplifies installation by allowing for limited straight pipe upstream and downstream of the meter in most installations.

Simplified Installation and Commissioning

Each Water Inline Ultrasonic meter is fully configured and programmed before it leaves the factory and is ready for use upon delivery.

Safe in Wet Locations

IP67 (NEMA 6) rating allows for safe operation during temporary periods of submergence.

Technical Specifications
Measuring Accuracy:

±1.0% of reading over 25:1 turndown
±2.0% of reading over 100:1 turndown

Repeatability & Linearity:


OVERALL Flow Range:

500:1 turndown

Meter Sizes

½”, ¾”, 1″, 1¼”, 1½”, 2″, and 2½”

Sensing Method

Direct beam path wetted ultrasonic sensors utilizing differential transit time velocity measurement.

Piping System Connections

½” through 2”: Male NPT threads
2½”: ANSI Class 150 raised face flanges

Temperature Ranges

Fluid: 32°F to 250°F (0 to 121°C)
Ambient: -13°F to 131°F (-25 to 55°C)

Maximum Operating Pressure

400 PSI | 27.6 bar

Pressure Drop

Less than 1 PSI at 4 ft/s, decreasing at lower velocities

Power Supply Requirements

20-28V AC/DC; 50/60 Hz, 5 VA maximum

Isolated Analog Output

May be programmed for flow rate or temperature. Configurable as 4-20mA (non-isolated). Optional 0-5 V or 0-10 V output.

Isolated Totalizing Solid State Contact Closure Pulse Outputs

May be programmed for volume, alarm indication, or Modbus coil indication.
Contact Ratings: 50mA, 30 VDC max.
Contact Pulse Duration: 1000 ms
Optional: Contact pulse duration (50, 100, or 500 ms)

Isolated Totalizing Pulse Inputs (Optional)

For use with sinking open collector or dry contact outputs.
Input rating: 30 VDC, 10 mA maximum
Pulse duration: 50 ms minimum

Network Connections 

Modbus RS485 serial interface – Standard with LCD Display units