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Ultrasonic heat meter SHARKY 774 compact DN20, qp 2.5 m³/h, with M-Bus interface. For billing measurement of heat in apartment buildings and transfer stations. MID approval class 2. More information
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| Connection size | DN 20 |
| Connection Type | External thread |
| Flow | 2.5 m3/h |
| M-BUS communication | Yes |
| Medium | Water |
| Medium Temperature | 15...90°C |
| Pressure | PN 16 |
| Type of Meter | Ultrasonic |
| Weight | 1.25 kg |
SHARKY 774 compact is a compact ultrasonic heat meter from the German manufacturer Diehl Metering. It is designed for billing measurement of thermal energy consumption in both heating and cooling systems. This version has a nominal flow rate qp of 2.5 m³/h, nominal diameter DN20 (G1B), and an M-Bus communication interface for remote data reading.
The meter is intended for billing heat measurement in apartment buildings, apartment substations, heating circuits with heat pumps, and cooling systems. Thanks to its height of only 58 mm above the pipe axis, it also fits into compact heat interface units and narrow installation shafts where a mechanical meter may not have sufficient space.
The qp 2.5 m³/h version is the most powerful in the SHARKY 774 compact threaded range. It is suitable for flats with higher heat loss, shared domestic hot water heating circuits, smaller commercial premises, or locations where the design flow rate is close to the 1.5 m³/h limit and you want some reserve without the risk of overloading the meter. It is ideal for property managers, HVAC designers, and plumbing companies that need a certified meter for allocating heating costs among end users.
Measurement principle
No wear, low pressure loss
1:100
qp/qi dynamic range
Service life
For M-Bus operation, 2× AA batteries
12
years of battery life
Resistance
MID electromagnetic immunity
E2 + M2
immunity class
The meter evaluates flow using the ultrasonic transit-time measurement method. There are no moving parts inside the pipe, which eliminates mechanical wear and allows the meter to maintain its accuracy throughout its service life. The low starting flow rate (4 l/h for qp 2.5 m³/h) ensures that the meter also captures small off-peak consumptions.
Ultrasonic measurement is insensitive to suspended particles in the heating water, which means the device performs well even in systems where mechanical meters tend to become clogged.
The meter is equipped with an M-Bus interface in accordance with EN 13757-3. Data is transmitted over two non-polarised wires, the interface is galvanically isolated, and it supports automatic baud rate detection at 300 and 2,400 baud. The configurable telegram allows reading of current energy, power, volume, flow rate, temperatures, and historical data.
Current consumption is recalculated every 2 seconds, while temperatures are updated every 16 seconds, so the user always sees the current system status in the central unit.
Technical parameters:
An ultrasonic meter has no moving parts, so it does not suffer mechanical wear in operation and maintains its accuracy throughout its service life. It achieves lower pressure losses, offers a wider dynamic range (qp/qi up to 1:100), and can detect very low flow rates from 4 l/h. At the same time, it is insensitive to dirt and suspended particles in the heating water, to which mechanical meters are prone.
The qp 2.5 m³/h version is designed for higher flow rates, typically for flats with higher heat loss, shared domestic hot water heating circuits, smaller commercial premises, or locations where the design flow rate exceeds 1 m³/h. The maximum flow rate qs is 5 m³/h. The qp 1.5 m³/h version (DN15 or DN20) is suitable for standard apartment circuits, while the qp 0.6 m³/h version is intended for flats with low heat loss and passive buildings. If the meter is undersized, it operates close to its overload limit and its service life is reduced; if oversized, it may lack sufficient resolution in the lower part of the flow curve.
M-Bus (Meter-Bus) is a standardised bus system 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 to the 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 axis. This orientation independence is due to the ultrasonic measurement principle, which does not require straight pipe runs 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 reduce 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 under the MID directive (DE-13-MI004-PTB008) in accuracy class 2 and for cooling in accordance with PTB K7.2. It therefore meets the requirements for a legally controlled meter used for billing of 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.
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