HYDRUS 2.0 BULK is a static water meter operating on ultrasonic measuring technology. This technology enables accurate calculation of water consumption with long-term stability and eliminates measuring deviations caused by sand, suspended particles, scale or air pockets. Moreover it does not require any earthing.
Developed within the framework of the MID, HYDRUS 2.0 BULK complies with the European regulations and holds sanitary conformity certificates (ACS, WRAS, BELGAQUA, DM174 and others). The meter is also designed for cold and hot water.
Its integrated radio enables remote reading of the meter's index and alarms both in mobile (walk-by, drive-by, passive drive-by) and fixed network mode.
HYDRUS 2.0 BULK offers a wide choice of connectivities compatible with the different IZAR reading modes.
A complete Diehl Metering solution is thus available to meet your needs.


  • DN 50 to 200
  • MID approval up to R=1,000
  • IP 68
  • Wireless M-Bus radio, Wired M-Bus/Pulse/Pulse, Wireless M-Bus radio/L-Bus/Pulse, Pulse (IZAR BE PULSE compatible)
  • Display with symbols and error codes
  • Self-monitoring function
  • Battery lifetime up to 16 years
  • Privacy

    The HYDRUS 2.0 BULK saves 512 daily consumption values. This data can be read locally and accessed only by using the IZAR@MOBILE 2. As a second logging, a small amount of 32 monthly consumption values can be stored. Both the radio protocol and the optical interface are encrypted by default.

  • Technical data
    Water temperature°C+0.1 ... +50 (T30 / T50) | +0.1 ... +90 (T90)
    AccuracyClass 2 according to ISO 4064:2014 / OIML R49:2013
    Ambient operating temperature°C-10 ... +55
    Ambient storage temperature°C-10 ... +70 (>35 °C max. 4 weeks)
    Environmental classO (Outdoors)
    Mechanical environmental classM2
    Electromagnetic environmental classE2
    Flow profile sensitivity classU0/D0 (no calming sections required)
    Installation positionHorizontal, inclined 45°, inclined 90°, vertical
    Nominal pressurePNbar16
    Pressure loss classΔpbar0.16
    Power supply3.6 V lithium battery (D-cell)
    Battery lifetime1Up to 16 years (all communication interfaces)
    Communication interfacesOptical, OMS wireless M-Bus 434 or 868 MHz, M-Bus, L-Bus and Pulse
    Data storageFor errors, alarms and measuring values, data logging capabilities to record up to 512 daily + 32 monthly values
    Protection classIP 68
    1 Theoretical lifetime, depends on the sending interval of the radio telegram, the telegram length and the ambient temperature at the installation.
  • Technical data display
    Display indicationLCD, 9-digit, additional symbols/display counter/unit
    Units displayed DN 50 - 100Volume (m³ + 2 digits after decimal point) and flow rate (m³/h + 3 digits after decimal point)
    Units displayed DN 125 - 200Volume (m³ + 1 digit after decimal point) and flow rate (m³/h + 3 digits after decimal point)
    Values displayedDisplay test - volume - battery lifetime - firmware version - software checksum - flow - current/continuous/historical error - alarm status - high resolution volume - due date - due date volume - reverse volume - flow direction - display counter - low battery indication - leakage indication - metrological log access - radio signal ON/OFF - alarm indication - billing value
  • Communication interfaces
    OpticalFor switching the display loop, reading and configuration with IZAR@MOBILE 2
    Radio434 or 868 MHz, Open Metering Standard (OMS) radio frame (short frame) for mobile reading sent every 14 seconds, long range radio frame for fixed network sent every 5 minutes, extra long range radio frame for fixed network sent every 15 minutes
    M-Bus2,400 baud, cable length 1.5 m*, power supply only via built-in battery - is combined with 2 pulse outputs
    L-BusIn combination with radio, cable length 1.5 m* (only 1 interface communicating at the same time)
    Pulse (Open drain)2 pulse outputs, or 1 pulse and 1 L-Bus output, pulse cable length 1.5 m*
    *May vary by up to ±3.5% due to manufacturing tolerances.
  • Security
    VersionsOMS Generation 3 - Profile A or OMS Generation 4 - Profile B
  • Volume / Pulse open drain
    Max. input voltageV30
    Max. input currentmA27
    Max. voltage drop at active outputV/mA2 / 27
    Max. current through inactive outputμA/V5 / 30
    Max. reverse voltage without destroying outputsV6 (in case current does not exceed 27 mA)
    Pulse rates DN 50l/pulse1 / 10 / 100 / 1,000 (depending on nominal size)
    Pulse rates DN 65 - 150l/pulse10 / 100 / 1,000 (depending on nominal size)
    Pulse rates DN 200l/pulse100 / 1,000 (depending on nominal size)
    Configuration pulse output 1Total volume or forward volume
    Configuration pulse output 2Flow direction or error, reverse volume, forward volume
    Pulse frequencyMax. frequency 10 Hz
    Pulse width50 ms
  • Available versions
    Wireless M-Bus radio/Pulse/L-Bus3 wires - only forward volume for pulse output 2 (minimum 10L/pulse)
    Wireless M-Bus radio onlywithout wire
    Wired M-Bus/Pulse/Pulse5 wires - forward volume on pulse output 1 and reverse volume on pulse output 2
    Pulse (IZAR BE PULSE compatible)4 wires - total volume on pulse output 1 and direction on pulse output 2 with fraud
  • Performance Data - Cold water (T30 / T50) Horizontal
    Nominal diameterDNmm506580100125150200
    Permanent flow rateQ3m³/h254063100160250400
    Dynamic (Q3/Q1)R800800800800800800800
    Overload flow rateQ4m³/h31.255078.75125200312.50500
    Transitional flow rateQ2l/h5080126200320500800
    Minimum flow rateQ1l/h31.255078.75125200312.50500
    Starting flow ratel/h1527354570250400
    Pressure loss at Q3bar0.
    Pressure loss at Q4bar0.
    Maximum flow rate 2Qhighm³/h62.5100157.52504006251000
    Flow rate at ΔP = 1 barm³/h631051582804207471140
    2 Outlet pressure minimum 3 bar, maximum 100 hours per year, closed pipeline network
  • Performance Data - Hot water (T90) Horizontal
    Nominal diameterDNmm506580100125150200
    Permanent flow rateQ3m³/h254063100---
    Dynamic (Q3/Q1)R400400400400---
    Overload flow rateQ4m³/h31.255078.75125---
    Transitional flow rateQ2l/h100160250400---
    Minimum flow rateQ1l/h63100160250---
    Starting flow ratel/h15273545---
    Pressure loss at Q3bar0.
    Pressure loss at Q4bar0.
    Flow rate at ΔP = 1 barm³/h63105158280---
  • Approval
    ApprovalMID DE-19-MI001-PTB011
    Dynamic range (Q3/Q1)RUp to R=1,000
    StandardsISO 4064 | EN 14154 | OIML R49
    Sanitary conformityACS | WRAS | DM174 | BELGAQUA
  • Dynamic Range
    Q3 25 ... 400 m³/h - T30R800
    Q3 25 ... 400 m³/h - T50R800H / 250V
    Q3 25 ... 100 m³/h - T90R400H / 160V
    H=horizontal installation position / V=vertical installation position
  • Pressure loss graph / Typical error graph

  • Dimensions
    Nominal diameterDNmm506580100125150200
    Overall length (T30 / T50)Lmm200/ 270 / 3003200 / 3003200 / 225 / 300 / 3503250 / 3504 / 360250300 / 500350
    Overall length (T90)Lmm200200200 / 225250---
    Flange diameter 5Dmm165185200220250285340
    Hole circle diameter 5Kmm125145160180210240295
    Number of screwholes 5pcs448888126
    Screwhole diameter 5D1mm19191919192323
    Counter lengthL1mm98989898989898
    Meter widthBmm165185200220250285340
    Counter widthB1mm139139139139139139139
    Overall weight (approx.)kg7 / 9 / 98 / 1111 / 13 / 14 / 1517 / 19 / 202338 / 4551
    3 Optionally with rotatable flange
    4 Rotatable flange
    5 Flanges according to EN 1092, PN 10/16
    6 8 Screwholes for PN 10
  • Meter body variants

    a) The cold water meters come with an epoxy-coated cast iron housing as standard. ISO short length variants can optionally be manufactured with a stainless steel housing.
    b) ISO long length meters with diameters up to DN 100 can optionally come with rotatable flanges.
    c) Hot water meters are always provided with stainless steel housings (EN 1.4408, AISI 316).

  • Reach

    Information pursuant to Article 33 (1) of Regulation (EC) No 1907/2006 of the European Parliament and of the Council of 18 December
    This product series contains articles with the following substances in a concentration of more than 0.1% weight by weight (w/w):
    - Lead

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