ALTAIR V4 CONCENTRIC is the latest generation of volumetric water meters specifically designed for installation on coaxial base in concentric manifold.
ALTAIR V4 CONCENTRIC adapts to the most demanding environments and varying water qualities while maintaining its excellent metrology.
Developed within the MID framework, it complies with European standards and holds certificates of sanitary conformity.
Modular, ALTAIR V4 CONCENTRIC may be fitted at any time with an IZAR clip-on module converting it into a communicating meter, ready for mobile reading (walk-by, drive-by, passive drive-by) or fixed network reading (radio/wired).


  • Q3=2.5 m3/h / Q3=4 m3/h
  • MID approval up to R=1000
  • Starting flow rate at 0.4 l/h (Q3=2.5m3/h) / 0.7 l/h (Q3=4m3/h)
  • Composite or brass body
  • Cold water
  • Metrological data
    Nominal flowrateQ3m³/h2.54
    R standard*Q3/Q1160160
    Starting flow ratel/h0.40.7
    Minimum flow rateQ1l/h15.6225
    Transition flow rateQ2l/h2540
    Maximum flow rateQ4m³/h3.1255
    Head loss at Q3bar0.590.55
    Head loss at Q4bar0.920.85
    Kvs (deltaP=Q²/Kvs²)3.255.41
    * Other values on request
  • Approval
    MID ApprovalLNE-6250 | Type A2
    StandardsEN 14154 | ISO 4064 | OIML R49
    Sanitary conformityACS | WRAS

    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)

  • Temperature and pressure
    Water temperature°C0.1 ... +50
    Ambient operating temperature°C+1 ... +55
    Storage temperature°C-10 ... +55
    Nominal pressurebar16
  • Dimensions
    Thread connectionsinch1"½
    Weight (brass version)kg1.11
    Weight (composite version)kg0.55
    Fitting and removing wrench
    A special wrench is required for fitting or removing the meter (contact Diehl Metering). The two seals remain on the meter when it is removed.
  • Precision curve

  • Option

    - Plastic register