Connected industrial water meter: measurement and remote reading with no construction work

There are plenty, but six families cover most needs. Mechanical meters (single-jet, multi-jet, Woltmann, volumetric) remain rugged and affordable for clean water. Electromagnetic meters, with no moving parts, measure conductive liquids, including loaded ones. Ultrasonic meters, also with no moving parts, offer low pressure loss and come in clamp-on versions. Then there is Coriolis for demanding processes, vortex for clean fluids at sustained flow, and differential pressure devices (orifice plate, venturi), which are simple but cause more pressure loss.

For Willie remote reading, only the output matters: a meter fitted with a pulse output connects, whatever its technology.

It depends on what the measurement is used for. A clean-water meter used for regulated measurement, such as billing, falls under Directive 2014/32/EU (Annex MI-001), which covers cold and hot water meters for residential, commercial and light industrial use. The OIML R 49-1 recommendation and the ISO 4064 standard set out the metrological requirements. A process instrument, used to run a line rather than to bill, generally falls outside that scope.

Whatever your case, the Willie module is mounted outside the instrument: seals and metrological compliance stay intact.

Start from the liquid, not the catalog. Electromagnetic meters need a conductive liquid (water is, demineralized water much less so) but tolerate suspended solids. Transit-time ultrasonic meters handle bubbles and particles poorly and, like turbines, need straight pipe runs upstream and downstream. Turbines cost less to buy, but their moving parts wear and create pressure loss. Then weigh flow range, target accuracy, maintenance and budget.

An electromagnetic meter applies Faraday's law: a magnetic field crosses the pipe, and the flowing water induces a voltage proportional to its velocity, measured by electrodes.

Yes, in two cases out of three. Adding a remote-reading module to an existing meter does not touch the pipe: that is the Willie solution. A clamp-on ultrasonic flow meter also attaches to the outside of the pipe. Installing a new in-line device, on the other hand, means cutting, draining and working on the pipework. The audit tells you which of the three applies to each metering point.

It depends on what you want to read. A pulse output totalizes a volume: each pulse is worth 1 L, 10 L or 100 L, the natural format for consumption tracking and remote reading. A 4-20 mA signal transmits an instantaneous value, the flow rate, and is the usual format for a PLC regulating a process. On the risk side, a badly configured pulse (wrong pulse weight, bounce, electrical noise) skews totalization, while a badly scaled 4-20 mA skews the flow rate.

For an industrial water meter, Willie remote reading relies on the pulse output.

Not by pipe diameter! A meter is sized on its actual flow range: minimum, permanent and maximum flow rate, then pressure, temperature, acceptable pressure loss and installation conditions. Oversized, it under-counts low flows, and therefore leaks. Undersized, it wears quickly and restricts flow. The flow curves Willie collects give you the actual range to use before any replacement.

There is no single price range. The cost depends on the existing meter, its technology, diameter, required accuracy, number of points, any construction work, communication and software: a mechanical meter connected with a module and a complete process flow meter have nothing in common. The good news is that on an existing fleet, the module avoids construction work, whereas traditional remote reading costs 300 to 500 € per point to install. During a 30-minute demo, a Willie expert prices your project based on your actual fleet.