LSonic Flow Meters

LSonic Range 500LSonic Range 500
LSonic Range 1 500LSonic Range 1 500
LSonic Range 3 500LSonic Range 3 500

Information about the LSonic meters

LSonic is a range of reliable and easily configured in-line ultrasonic flow meters offering accurate flow measurement with easy configuration and no maintenance requirement. Available to suit a variety of pipe diameters and flow rates, with very low pressure drop, LSonic units have a detachable display and internal data logging, data accessible via BACnet® or MODBUS®.

Reliable, no-moving parts design

Wetted transducers measure the ultrasonic signal transit time differential up and down stream, which correlates directly to the flow rate. The direct beam path orientation significantly enhances signal strength and long-term reliability.

User-friendly backlit display & user interface

‘Smart Button’ technology in the easy to read, backlit display simplifies page navigation and programming, eliminating the need for configuration tools.

Accurate over a wide flow range

LSonic meters are accurate to within ±1% over the normal operating range (25:1 turndown) and within ±2% over an extended, 100:1 turndown, range. Repeatability is better than ±0.2%.

Detachable display

The LSonic user interface display detaches easily from the flow sensor, allowing it to be mounted remotely, up to 1.5m away from the sensor body.

Built-in interval data logger

Volume totals are date/time stamped and logged within the meter along with other analytical data. The data is available via BACnet® or MODBUS®.

  • Description
  • Design Details
  • Specifications

In-line ultrasonic flow meters

LSonic is a range of reliable and easily configured in-line ultrasonic flow meters offering accurate flow measurement with easy configuration and no maintenance requirement.
Available to suit a variety of pipe diameters and flow rates, with very low pressure drop, LSonic units have a detachable display and internal data logging, data accessible via BACnet® or MODBUS®.

Accurate over a wide flow range

LSonic meters are accurate to within ±1% over the normal operating range (25:1 turndown) and within ±2% over an extended, 100:1 turndown, range. Repeatability is better than ±0.2%.

Reliable, no-moving parts design

Wetted transducers measure the ultrasonic signal transit time differential up and down stream, which correlates directly to the flow rate. The direct beam path orientation significantly enhances signal strength and long-term
reliability.

User-friendly backlit display & user interface

‘Smart Button’ technology in the easy to read, backlit display simplifies page navigation and programming, eliminating the need for configuration tools.

Detachable display

The LSonic user interface display detaches easily from the flow sensor, allowing it to be mounted remotely, up to 1.5m away from the sensor body.

Built-in interval data logger

Volume totals are date/time stamped and logged within the meter along with other analytical data. The data is available via BACnet® or MODBUS®.

Calibration

Each LSonic meter is conformance-tested prior to delivery to ensure that it functions fully and meets the published performance and accuracy specifications, supported by a certificate of conformance. LSonic units are manufactured in the United States and tested using equipment directly traceable to NIST (National Institute of Standards and Technology).

Approvals

• FCC: Part 15, Subpart B
• ANSI/NSF 61 &372
• BTL Certified to ASHRAE 135:2009

LSonic series meter design details

Meter size

Process connection type

BSP available

Typical design flowAccuracy ±1% of rate rangeAccuracy ±2% of rate rangeMinimum flowCvLength with couplings or flanges
(nominal) m3/hm3/hm3/hm3/h mm
1/2”Male NPT1.50.14 to 3.40.03 to 3.40.0075.262285
3/4”Male NPT1.50.14 to 3.40.03 to 3.40.0075.262297
3/4”Male NPT2.50.23 to 5.70.06 to 5.70.0117.625297
1”Male NPT2.50.23 to 5.70.06 to 5.70.0117.625312
1”Male NPT3.50.32 to 80.08 to 80.01610.53381
1 1/4”Male NPT60.68 to 13.60.13 to 13.60.02731.98387
1 1/2”Male NPT101.14 to 22.70.22 to 22.70.04544.32432
2”Male NPT151.82 to 340.34 to 340.06887.59439
2 1/2”Class 150 flange252.72 to 510.57 to 510.11135.2300

Accuracy ±1% of reading over 25:1 turndown; ±2% of reading over 100:1 turndown; Repeatability: ≤±0.2%
Overall flow range  500:1 turndown
Sensing method Direct beam path wetted ultrasonic sensors utilising differential transit time velocity measurement
Meter sizes 1/2 - 2 1/2” nominal diameter (12.5 - 63.5mm)
Piping system connections Male NPT threads, BSP optional; 2 1/2 meter has ANSI Class 150 raised face flanges
Fluid temperature range 0 - 121ºC
Ambient temperature range -25 to 55ºC
Maximum operating pressure 27 bar
Pressure drop Less than 70 mbar at 1.2 m/s, less at lower velocities
Power supply 20-28V AC/DC, 50/60Hz, 5 VA minimum
Isolated analogue output May be configured as flow rate or temperature Configurable as 4-20mA (non-isolated) Optional 0-5V or 0-10V output
Isolated totalising solid state contact closure pulse outputs May be programmed for volume, alarm or MODBUS coil indication Contact ratings: 50mA, 30VDC maximum Contact pulse duration: 1000ms Optional: Contact pulse duration 50, 100 or 500ms
Isolated totalising pulse outputs (optional) For use with sinking open collector or dry contact outputs Input rating: 30VDC, 10mA maximum Pulse duration: 50ms minimum
Network connections (optional) Isolated RS485 serial interface
Communications protocols (optional) BACnet MS/TP per ASHRAE Standard 135.1:2009 MODBUS RTU
When provided with a display, L-Sonic features an IP65 enclosure. Field wiring connections are made to internal terminal blocks through the 4 cable glands provided.
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