An ultrasonic meter has no moving parts, so it does not suffer from mechanical wear in operation and maintains its accuracy throughout its service life. It achieves lower pressure loss, has a wider dynamic range (qp/qi up to 1:100), and can detect even very low flow rates from 2.5 l/h. At the same time, it is insensitive to dirt and suspended particles in the heating water, to which mechanical meters are prone.

M-Bus (Meter-Bus) is a standardised bus for remote meter reading in accordance with EN 13757-3. The meter is connected via a two-wire non-polarised line to an M-Bus master (converter or concentrator), which collects the data and passes it on to a higher-level system. Communication is galvanically isolated and supports automatic speed detection at 300 and 2,400 baud. In addition to M-Bus, a ZVEI optical interface is also available for local service reading.

The meter can be installed in any position – horizontally, vertically on a riser or downpipe, or even inverted above the pipe centreline. This orientation independence is due to the ultrasonic measuring principle, which does not require straight pipe lengths upstream and downstream of the meter to the same extent as mechanical water meters.

For the M-Bus version, the battery lasts up to 12 years under standard operating conditions. Higher ambient temperatures shorten battery life, which is why operation below 35 °C is recommended. The battery cannot be replaced by the user during operation; replacement is carried out by the manufacturer's service laboratory.

Yes. The SHARKY 774 compact is approved in accordance with the MID directive (DE-13-MI004-PTB008) in accuracy class 2 and for cooling according to PTB K7.2. It therefore meets the requirements for a legally controlled meter used for billing heat and cooling. The meter belongs to environmental class E2 (electromagnetic immunity) and M2 (mechanical immunity), making it less susceptible to interference from PWM circulation pumps and similar sources.