SHARKY 774 compact
ULTRASONIC COMPACT ENERGY METER
SHARKY 774 COMPACT ultrasonic energy meter is designed for measuring the energy consumption in heating or bifunctional (heating/cooling) application for billing purposes. Its static ultrasonic technology is based on the measurement of the transit time. It offers many benefits: no moving parts (reduces wear and tear of the metering components), low pressure loss, wide dynamic measuring range, low start flowrate and insensitiveness to suspended particles.
- M-Bus or Wireless M-Bus (OMS radio 868 MHz) communication. Enhanced transmission performance is achieved when combined with Diehl Metering AMR system technology
- Heat-transfer fluid: water
- Constant high measuring rates of the temperatures and volume with up to 12 years battery life time
- 8-digit LCD
- Removable calculator (0.45m coaxial cable) ensuring comfortable reading
Application Heating or bifunctional (heating /cooling) | Heat-transfer fluid: glycol-free water Approval MID (DE-13-MI004-PTB008) Accuracy class Class 2 Ambient temperature °C +5 ... +55 (<35 has a positive effect on battery lifetime) Storage temperature °C +5 ... +55 | max. -20 ... +60 (max. 4 weeks) Humidity % 93 maximum Battery supply 3.6 VDC 2xAA-Cell Lithium content g 2 x 0.7 Temperature sensor type Pt 500, 2-wires: Ø 5.2 mm Cable length of temperature sensor m 1.45 Test possibilities Via display Volume measuring cycle s 2 Temperature measuring cycle s 16 (long radio telegram + Mbus) / 32 (short radio telegram) Power calculation cycle s 2
Flow sensor - basic features
Dynamic range (qp/qi) 1:100 Mounting position flow sensor Any position, calming section not necessary Temperature range (heating) °C +5 ... +105* Temperature range (heating/cooling) °C +5 ... +105 Protection class IP54 (heating) - IP68 (heating/cooling)* +130°C in option
Calculator - basic features
Protection class IP 65 Environmental class - mechanical M1, M2 Environmental class - electromechanical E1, E2 Calculator Removable, with 0.45 m cable to flow sensor Absolute temperature range Θ °C +1 ... +105 (+130 in option) Starting temperature difference ΔΘ K 0.125 Min. temperature difference ΔΘmin K 3 (MID approved) Max. temperature difference (heating) ΔΘmax K 127 (MID approved) Extensive readable data memory 2 predefined history logs for 720 daily (Log-1) and 120 monthly (Log-2) values of energy, volume and error hours; additonally event memory (error log)
Optical ZVEI interface, for communication and testing, M-Bus protocol Display LCD, 8-digit M-Bus According to EN13757-3:2013 Wireless M-Bus According to EN13757-4:2013
Display indication LCD, 8-digit Units kWh - m³ - °C - m3/h * Total values 99,999.999 Values displayed (main loop) Energy - Volume - Flow - Power - Temperature - Differential temperature - Operating days - Error Status - Display test* MWh - GJ in option
M-Bus Auto baud detect (300 and 2,400 bauds); galvanically insulated Data transmission Data reading via 2 non-polarized wires (1.45 m) Battery lifetime Up to 12 years**Under standard conditions of use and temperature. Theoretical lifetime, with no guarantee.
Wireless M-Bus (radio)
Frequency band 868 MHz Type of radio telegram Open Metering Standard (OMS) Transmission data updating Online - no time delay between value measurement and data transmission Data transmission Unidirectional Battery lifetime Up to 12 years* Sending interval options1 Short telegram: 33 sec. for heating, 43 sec. for heating/cooling | Long telegram: 64 sec. for heating, 91 sec. for heating/cooling*Under standard conditions of use and temperature. Theoretical lifetime with no guarantee.
Technical data flow sensor
Nominal flow rate qp m³/h 1.5 2.5 Nominal diameter DN mm 15 20 Overall length L mm 110 130 Starting flow rate l/h 2.5 4 Minimum flow rate qi l/h 15 25 Maximum flow rate qs m³/h 3 5 Overload flow rate m³/h 4.6 6.7 Operating pressure PN bar 16 16 Kvs value (Δp=Q2/Kvs2) 4.33 7.91 Pressure loss at qp Δp mbar 120 100
Dimensions thread version
Nominal flow rate qp m³/h 1.5 2.5 Nominal diameter DN mm 15 20 Overall length L mm 110 130 Overall length with coupling L2 mm 190 230 Length of calculator L1 mm 90 90 Height H mm 14.5 18 Height H1 mm 55 58 Height of calculator H2 mm 27 27 Height of calculator H3 mm 40 40 Width of calculator B mm 135 135 Connection thread on meter inch G¾B G1B Connection thread of coupling inch R½ R¾ Weight kg 0.70 0.77
- Pressure loss graph / Typical error graph