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Ultrasonic flow meter, flow meters


FLOWBOX flow meter with flumes or measuring weirs


The subject of our offer is an ultrasonic flow meter FLOWBOX intended for measuring momentary and total flow of the liquid in gravitational channels, with the use of measuring flume or measuring weir. Upon request, it’s also possible to carry out pre-investment technical consulting, as well as subsequent installation, launching* and protocol-based delivery of flow meter for the use.

See also------------


* Launching of our ultrasonic flow meter FLOWBOX in your facility (unlike many products of the competition) is very simple and in most cases, it doesn’t require a visit of specialized service – we provide factory pre-programmed (for the given type of flume or measuring weir) and pre-calibrated set (only one parameter needs to be adjusted).




pdf_iconFLOWBOX flow meter data sheet

pdf_iconFLOWBOX flow meter manual



  • M1600 Transmitter

  • Ultrasonic level sensor

FLOWBOX flow meter - set design

Measurement of the liquid flow is carried out based on the rising element:



Described measurement of the liquid flow, based on ultrasonic flow meter, is currently one of the most popular and proven methods for measuring liquid flow in the gravitational channels, which has been used on the market for many years now. Every year, several hundred of new locations are equipped with the flow meters FLOWBOX manufactured by us, which in great majority successfully fulfil assumed measuring functions. The basis of operation of the flow meter FLOWBOX is the measurement of ultrasonic beam passage time between the ultrasonic sensor and the surface of dammed up liquid by one of the standardized damming elements (measuring flume or measuring weir), on the basis of which the level of liquid’s damming up is determined, and then – after using appropriate conversion formula – current flow rate of the liquid is determined.

The basic condition for the use of this method is to provide laminar flow of the liquid through damming element (e.g. measuring flume) and to ensure free unhindered outflow.

The ultrasonic method used for measurement has many advantages – among others, it enables the lack of direct contact of the measuring sensor with contaminated or aggressive medium.


Exemplary instalations of our FLOWBOX flow meters------------

Flowmeter in IP66 cabinet   ZPB flume in a well

M1600 Transmitter   Measurign weir

FLOWBOX flowmeter   Parshall flume

Flowmeter FLOWBOX with recorder   Venturi measuring flume



  • Readout: momentary flow rate, total flow rate

  • Current outputs: 0-20mA, 4-20mA

  • Impulse output - adder

  • Digital outputs RS232C/485 - Modbus (optional)

  • Accuracy ± 0,1% of range

  • Supply: ~230 V, 50 Hz or battery supply

  • Power input <10 VA

  • Ambient temperature: - transmitter: -10 do +55 C, sensor:-30 do +60 C

  • Housing protection rating: - transmitter: IP65, sensor: IP65 (na życzenie IP68)

  • Housing material: - tramsmitter: ABS, sensor: PVC

  • Weight: ~1,5kg

  • Narrow ultrasonic beam

  • Measuring range: 0-1,8m

  • Sensor accuracy: ± 0,25% of measuring range

  • Automatic temperature compensation



  • Flow meter with data logger module - recording and collecting measuring parameters from the flow meter with a preset frequency, possibility to view historical data and to process data on a PC.

  • Flow meter FLOWBOXplus - additional qualitative measurement of a parameter of the liquid flowing through the flume or measuring weir (pH, oxygen, redox, conductivity).

  • Flow meter FLOWBOXbat - battery version, power supply up to 6 months in temp. +20 C (depending on the frequency of sampling), possibility to support it with a solar, with the use of which, this set is practically maintenance-free.

  • Flow meter with remote data transmission module - based on cell phone technology GSM or radio transmission.

  • It’s possible to select any compilations of the above-mentioned functionalities in one flow meter.

FLOWBOX flow meter with data recorder


FLow meter FLOWBOX with battety and solar supply


Flow meter with remote data transmission module



Główny Urząd Miar

Biuro Metrologii Prawnej

Currently, the list of instruments subject to metrological inspection in accordance with article 8 of the regulation of 11 May 2001 „Trade Metrology Act” (Dziennik Ustaw of 2004 No. 243, item 2441 as amended) is specified in the regulation of the Minister of Economy of 27 December 2007 establishing the types of measuring instruments subject to legal metrological inspection and the scope of metrological inspection (Dziennik Ustaw of 2008 No. 3, item 13). The regulation does not establish the duty of metrological inspection of liquid meters in open channels, and the certification body informs that the liquid meters in open channels are not subject to metrological inspection and no approval or verification process is anticipated.

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