SHARKY 774 compact



The ultrasonic compact energy meter can be used for measuring the energy consumption in heating or cooling application for billing purposes. The measurement principle is static and based on the measurement of the transit time. Ultrasonic technology offers many benefits: no moving parts (avoids wear and tear of the metering components), low pressure loss, large metering dynamics and low start flowrate, insensitiveness to suspended particles.


  • AMR Smart Meter
  • M-Bus or wM-Bus Radio. Combined with Diehl Metering AMR System technology highest transmission performance is achievable
  • Constantly high measuring rates (flow: 2 s; temp.: 16 s) with up to 12 years battery lifetime. Current power is calculated and updated every 2 s.
  • AA-cells contain less lithium (0.7 g per piece) than A-cells.
  • Springless battery contact (hard-solder) is corrosion-protected
  • MID class 2 and PTB K7.2
  • MID electromagnetic class E2 and mechanical class M2 – less sensitive to neg. influence, e.g. culprit PWM pump
  • 8-digit LCD offers 3 fractional digits without risk of display overflow.
  • Only 54 mm design hight from pipe center, hence easy to install in compact heat stations
  • Basic features
    ApplicationHeating - cooling - heating/with cooling tariff
    ApprovalMID (DE-13-MI004-PTB008) and PTB K7.2 for cooling (DE-16-M-PTB-0041)
    Environmental classClass C
    Ambient classClass E2 + M2
    Ambient operating temperature°C+5 ... +55 (<35 °C have a positive effect on battery lifetime)
    Ambient storage temperature°C-25 ... +60 (>35 °C max. 4 weeks)
    CommunicationM-Bus or radio
    Frequency band868 or 434 MHz
    Type of radio telegramOpen Metering Standard (OMS)
    Transmission data updatingOnline - no time delay between value measurement and data transmission
    Data transmissionUnidirectional
    Sending intervalRapid mode (drive-by): 14 s + synchron telegram: 900 s | standard mode (walk-by): 64 s + synchron telegram: 900 s
    Test possibilitiesVia display, optical test pulses
  • Reach

    Information pursuant to Article 33 (1) of Regulation (EC) No 1907/2006 of the European Parliament and of the Council of 18 December 2006:
    This product series contains articles with the following substances in a concentration of more than 0.1% weight by weight (w/w):
    - Lead (CAS no.: 7439-92-1)
    - Lead titanium zirconium oxide (CAS no.: 12626-81-2)
    - Octamethylcyclotetrasiloxane (CAS no.: 556-67-2)
    - Decamethylcyclopentasiloxane (CAS no.: 541-02-6)
    - Dodecamethylcyclohexasiloxane (CAS no.: 540-97-6)

  • Basic features - Calculator
    Protection classIP 65
    Battery supply3.6 VDC (2xAA-cell), up to 12 years lifetime (at standard conditions of use and temperature)
    Battery1 lifetime - radioRapid mode: up to 7 years; standard mode: up to 11 years (depends on sending interval)
    Battery1 lifetime - M-BusUp to 12 years
    Temperature sensor typePt 500, 2-wire; Ø 5.2 mm
    Cable length of temperature sensorm1.45 / 1.95
    Absolute temperature range (heating)Θ°C1 ... 105 / 1 ... 130
    Absolute temperature range (cooling)Θ°C1 ... 50
    Measuring cycle - flowTs2
    Measuring cycle - temperature sensorTs16
    Starting temperature differenceΔΘK0.125
    Min. temperature differenceΔΘminK3
    Max. temperature differenceΔΘmaxK90 / 120 (heating) | 50 (cooling)
    Interfaces standardOptical ZVEI interface
    Interfaces optionalM-Bus or radio
    Extensive readable data memoryPeriodical log2; 3 history logs; event memory
    1 Battery exchangeable at lab
    2 Programmable storage interval (daily, weekly, monthly, ...)
  • Basic features - Flow sensor
    Mounting position flow sensorAny position, horizontal, riser or downpipe and overhead
    Protection class flow sensorHeating IP 54 | Heating with cooling tariff / cooling IP 68 (at normal ambient air pressure)
    Material of the flow sensor bodyBrass
    Temperature range heating°C5 ... 105 / 5 ... 130
    Temperature range cooling°C2 ... 50
    Temperature range heating with cooling tariff°C5 ... 105
    Dynamic range (qp/qi)1:100
    Useful range (qs/qp)2:1
  • Display
    Display indicationLCD, 8-digit
    UnitsMWh - kWh - GJ - °C - m³
    Total values99,999,999 - 9,999,999.9 - 999,999.99 - 99,999.999
    Values displayedEnergy - Power - Volume - Flow rate - Temperature and more
  • Interfaces
    OpticalZVEI interface, for communication and testing, M-Bus protocol
    M-BusConfigurable telegram, according to EN13757-3, data reading via two wires with non polarity (1.5 m), auto baud detect (300 and 2400 baud), galvanically isolated, one M-Bus load
    Wireless M-BusOpen Metering Standard (OMS), Generation 3 Profile A or Generation 4 Profile B; frequency band 868 or 434 MHz
  • Technical data flow sensor
    Nominal flow rateqpm³/h0.
    Nominal diameterDNmm15152020
    Overall lengthLmm110110130130
    Starting flow ratel/h12.52.54
    Minimum flow rateqil/h6151525
    Maximum flow rateqsm³/h1.2335
    Overload flow ratem³/h2.
    Operating pressurePNbar16161616
    kv value (qp² (m³/h) = kv² x Δp (bar))1.954.335.487.91
    Pressure loss at qpΔpmbar9512075100
  • Dimensions thread version
    Nominal flow rateqpm³/h0.
    Nominal diameterDNmm15152020
    Overall lengthLmm110110130130
    Overall length with couplingL2mm190190230230
    Length of calculatorL1mm90909090
    Height of calculatorH2mm27272727
    Height of calculatorH3mm40404040
    Width of calculatorBmm135135135135
    Connection thread on meterInchG¾BG¾BG1BG1B
    Connection thread of couplingInch
  • Pressure loss graph / Typical error graph