Compact Energy Meter | Mechanical


Fully electronic measuring capsule heat meter, heat and cooling meter or cooling meter with impeller scanning for volume measuring and energy calculation. Highly accurate recording of all billing data in a heating circuit or a cooling / heating circuit at medium temperatures from 5 °C up to 90 °C.


  • Electronic sensor control for recording flow rate
  • Lithium battery, lifetime up to 12 years
  • Optical ZVEI interface equipped as standard
  • Adjustable reading date for billing
  • Rotatable integrator
  • Single-line 7-digit display for easy meter reading
  • Can be installed in housings from the Diehl Metering range of accessories or in housings with a 2" coupling thread already available in the network
  • Components

    Multi-jet volume measuring component (DN 15 - 20) Calculator, contains hardware and software for measuring flow rate, temperature and energy consumptionTemperature sensor permanently connected in integrator

  • Calculator - basic features
    Ambient classEN 1434 class C / MID E1 + M1
    Protection class DIN 40050 / IEC-EN 60529IP 54 (heat meter) | IP 65 with potted calculator (combined heat-cooling / cooling meter)
    Interfaces standardOptical ZVEI according IEC 870-5
    Interfaces optionalM-Bus, radio, pulse
    Note: IZAR@SET / HYDRO-SET Software for configuration of meters, reading of measured values and printout of meter logs. Available under www.diehl.com/metering (Products - Downloads)
  • Display
    Display indicationLCD, 7-digit
    UnitMWh - kWh - GJ - MJ - kW - m³/h - l/h - m³ - l
    Total values9,999,999 - 999,999.9 - 99,999.99 - 9,999.999
    Values displayedPower - energy - flow rate - temperature - energy on reading date - reading date
  • Temperature input
    Temperature sensor typePt 500 / 2-wire
    Measuring cycleTs32
    Max. temperature differenceΔΘK+102
    Min. temperature differenceΔΘK+3
    Starting temperature differenceΔΘK+0.25
    Absolute temperature measurement rangeΘ°C0 ... 105
  • Supply voltage
    Operating voltageUNVDC3.0 (lithium battery)
    Battery lifetimeUp to 12 years
    Nominal powerPNμW30
  • Interfaces - Overview
    OpticalZVEI interface for communication, M-Bus protocol
    M-BusAccording to EN 1434-3. Data reading and parametrization are via two wires with polarity reversal protection. (Meter is powered with energy via M-Bus Master)
    Radio868 MHz, Real Data or Open Metering Standard (OMS) protocol
    PulseOutput for heat meters or cooling meters (energy / volume), for cooling-heat meters (energy cooling / energy heating or energy cooling / total volume), for heat-cooling meters (energy heating / energy cooling or energy heating / total volume)
  • Radio interface - specification
    ProtocolReal Data (according EN 13757) or Open Metering Standard (OMS)
    Transmission powermW10
    Transmission intervalsec.64
    CommunicationVia Bluetooth optohead and IZAR@SET / HYDRO-SET software or IZAR@MOBILE software
  • Volume- / energy pulse
    Output typeOpen collector
    Max. frequencyHz4
    Max. input voltageV30
    Max. input currentmA100
    Max. voltage drop at active outputV/mA2/27
    Max. current through inactive outputμA/V5/30
    Max. reverse voltage without destroying outputsV6
    Min. pulse durationms125
    Min. pulse breakms125
  • General
    Temperature range°C5 ... 90
    Ambient operating temperature°C0 ... 55
    Ambient storage temperature°C-20 ... 55
    Nominal pressurePNbar16
    Temperature sensor typePt 500 with 2 wire leads
    Cable length of temperature sensor0.4 m mounted in measuring capsule; 1.5 m free
    Mounting position energy meterIn any position, also up side down
    ApprovalMID (DE-07-MI004-PTB030) and PTB TR K7.2 (DE-19-M-PTB-0001) for cooling meter
  • Temperature sensor
    Tangential sensor1- - -
    Type 10.4 m | Ø 5.2 mm | PU grey | 3 K - 102 K
    Free sensor- - -
    Type 11.5 m | Ø 5.2 mm | PU grey | 3 K - 102 K
    Type 21.5 m | Ø 5 mm | PU grey | 3 K - 102 K
    1 mounted in measuring capsule
  • Technical data
    Nominal diameterDNmm151520
    Nominal flow rateqpm³/h0.61.52.5
    Maximum flow rateqsm³/h1.235
    Minimum flow rate at ΔΘ 3 Kqil/h120120120
    Minimum flow rate1qil/h61525
    Starting flow ratel/h1.5 - 23 - 45 - 6
    Pressure loss at qpΔpmbar243243242
    Flow rate at 0.1 bar pressure lossm³/h0.3850.9621.607
    Flow resistance coefficient Zeta56.25910.24
    1 according to EN1434 for flow sensor
  • Dimensions
    Nominal diameterDNmm151520
    Nominal flow rateqpm³/h0.61.52.5
    Connection interfaceØ AInchG2BG2BG2B
    DiameterØ Bmm636363
    DiameterØ Cmm747474
  • Dimensions - accessory
    Nominal diameterDNmm151520
    Nominal flow rateqpm³/h0.61.52.5
    Overall lengthLmm110110130
    Overall length with couplingL2mm190190210
    Order no. 1 piece303160230316023031600
    Order no. 6 pieces302696130269613029251
  • Pressure loss graph / Typical error graph

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