Meter for measuring heavily fluctuating flow rates.


  • Ideal design of housing and housing cover prevents sedimentation, stagnant water and air pockets
  • No measuring errors in the switch-over range
  • Encapsulated counter of glass/copper IP 68
  • Good long-term measuring accuracy
  • Complete head unit with counter and sensors can be rotated by 350° for easier reading
  • System compatibility, WESAN WPV A G can be extended with IZAR RADIO (clip on radio module), IZAR PULSE (clip on pulse module) or IZAR M-BUS I (clip on M-Bus module)
  • In order to secure a safe switch-over the WESAN WPV A G needs a minimum ingoing pressure of 0.6 bar
  • General
    Medium temperature range°C1 ... 30
    Temperature safety°C1 ... 50
    Ambient operating temperature°C1 ... 55
    Ambient storage temperature°C1 ... 55
    Nominal pressurePNbar161
    Display range0.5 l ... 999,999 m³
    Protection classIP 68
    Available bypass meterALTAIR V4
    1 versions with different nominal pressure on request (see also special versions)
  • Technical Data
    Nominal diameterDNmm150
    Permament flow rateQ3m³/h160
    Minimum flow rateQ1l/h40
    Transitional flow rateQ2l/h64
    Overload flow rateQ4m³/h200
    Starting flow ratel/h5
    Permanent flow rate bypass meterQ3m³/h16
    Switch-over flow rate risingl/h4350
    Switch-over flow rate fallingl/h7800
  • Approval
    Nominal diameterDNmm150
    MID (DE-17-MI001-PTB003)
    Dynamic range bypass meter ALTAIR V3 (Q3/Q1)R4000 H
    Potable waterKTW / W270

    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)

  • Special Versions

    - Versions with different nominal pressure on request
    - Special flange holes on request

  • Dimensions
    Nominal diameterDNmm150
    Overall length (DIN 19625)Lmm500 ± 15
    Flange diameterDmm285
    Hole circle diameterKmm240
    Number of screwholespcs8
    Screwhole diameterD1mm22
    Height to remove measuring insertmm475
    DiameterØ Bmm115
    Weight of complete meterkg68
  • Pressure loss graph / Typical error graph

You are currently using an outdated Internet browser, which is no longer supported for technical reasons. To use the Diehl website right, please use a modern browser in the latest version, such as Edge, Chrome, Firefox or Safari.


We would like to use Google Analytics to optimise the design of our website. Through this, Google collects data which is aggregated and made available to us as a statistical overview. By clicking "Agree", you consent to tracking by Google Analytics. This consent is voluntary and can be revoked at any time. If you click "Decline", no tracking will take place. For more information, please see our privacy policy.