• The ultrasonic flow measurement is based on the transit time principle. The system includes 2 fixed reflectors and 2 ultrasonic transducers, which can both operate as a transmitter or a receiver.
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• The built-in micro-controller alternately transmits a signal burst (pulses) between two transducers and measures the transit time that a pulse takes toreach the other side. The difference between two transit times in then used to calculate the current flowrate.
• UWM products are able to detect the time differences in the scale of picosecond, thus are suitable to measure very low flowrates and maximize the accuracy.

All UWM products comply with ISO 4064:2005 standard for cold and hot potable water meters.

• Maximum permissible error
• ±5% at flowrate between Q1 and Q2
• ±2% at flowrate between Q2 and Q4 (water temperature = 30°C)
• ±3% at flowrate between Q2 and Q4 (water temperature > 30°C)

The total amount of water consumption appears permanently on the meter’s display. In detail, the five large figures indicate number of cubic meter and the five small figures are decimals. The “CAL” symbol appears whenever the meter is in calibration mode. This mode is used during the manufacturing process only. The meter’s display contains several warning symbols, which have the following meanings:

UWM products support 2 methods of communication, including near field communication (NFC) and wireless M-Bus communication (433/865/867/868/915/924MHz).

Any device with NFC support, such as smart-phones or tablets can communicate with the meter. The specifications of NFC components inside UWM products are complied with ISO/IEC 15693 standard. For data reading operation, the NFC device should be placed on top of the meter as demonstrates in the picture above.

• The built-in LoRa (using the frequency of 433/865/867/868/915/924MHz) transmits a packet of data every as per preset interval i.e every 4/6/8/12/24 hours. These default settings can be changed to serve different purposes. Data is available on Web Server/Cloud, with proper application in sync. Typically the meter shall transfer data from its location to few kilometers based on location of the meter and gateway’s location.
• The gateway can be of proprietary or 3rd party Telcos. Accordingly the recurring charges of network provider will vary.
• Therefore, our UWM products are suitable for fixed network solution, which is considered fast, economical and accurate for data collecting.
• Each packet of data contains the following information:
  • Meter’s serial number
  • Total amount of water consumption
  • Meter’s warnings

All logging data are saved permanently inside the internal memory (EEPROM) of the meter. These logs can be accessed via near field communication only.