ALTAIR V4 DN25/32/40



ALTAIR V4 represents the latest generation of volumetric meters developed within the framework of the MID and European standards to meet field requirements.
ALTAIR V4 is a particularly compact and robust meter, adapting to the most restrictive environments and compatible with varying water qualities.
Modular, ALTAIR V4 may be fitted at any time with an IZAR clip-on module converting it into a communicating meter, ready for mobile or fixed network (radio/wired) reading.


  • DN 25 / 32 / 40
  • Q3 = 6.3 m³/h (DN 25 / 32), Q3 = 10 m³/h (DN 25 / 32) and Q3 = 16 m³/h (DN 40)
  • MID approval up to R = 800 (Q3 = 6.3 m³/h), R = 500 (Q3 = 10 m³/h) and R = 1,000 (Q3 = 16 m³/h)
  • Starting flow rate at 1 l/h (Q3 = 6.3 m³/h), 2.9 l/h (Q3 = 10 m³/h) and 4 l/h (Q3 = 16 m³/h)
  • Brass body
  • Glass-copper register
  • Compact
  • Installation in any position
  • Metrological data
    Nominal diameterDNmm2525323240
    Nominal flow rateQ3m³/h6.3106.31016
    R standard*Q3/Q1160160160160160
    Starting flow ratel/h12.912.94
    Minimum flow rate*Q1l/h39.37562.539.37562.5100
    Transitional flow rate*Q2l/h6310063100160
    Overload flow rateQ4m³/h7.87512.57.87512.520
    Head loss at Q3bar0.6160.4960.6110.4840.630
    Head loss at Q4bar0.9620.7760.9550.7850.984
    Kvs (deltaP=Q²/Kvs²)
    * Other values on request.
  • Approval
    MID approvalLNE-6250 | Type A2
    StandardsEN 14154 | ISO 4064 | OIML R49
    Sanitary conformityACS | Belgaqua | KTW | WRAS | DM 174

    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 components with the following substances in a concentration of more than 0.1% weight by weight (w/w):
    - Lead (CAS no.: 7439-92-1)

  • Temperatures and pressure
    Water temperature°C0.1 ... +50
    Ambient operating temperature°C+1 ... +55
    Storage temperature°C-10 ... +55
    Nominal pressurePNbar16
  • Dimensions
    Nominal diameterDNmm2525323240
    Nominal flow rateQ3m³/h6.3106.31016
    Thread connectionsGinch1”1/41"1/41"1/21"1/22"
    * Other values on request.
  • Precision curve - DN25/32

    This technology does not require straight length.

  • Precision curve - DN40

    This technology does not require straight length.

  • Options

    - Non-return valve
    - Pair of connectors

  • Sustainability:

    An important aspect of our business is to reduce our impact on climate change, and we therefore strive to minimize our carbon footprint.
    Carbon footprint :
    - ALTAIR V4 DN25/260 Brass: 19.65 kg CO2 eq
    - ALTAIR V4 DN32/260 Brass: 19.56 kg CO2 eq
    These data are taken from the Life Cycle Assessment (LCA) that was conducted to evaluate the environmental effects of the product over its entire life cycle.
    Please note that an Environmental Product Declaration (EPD) is available on the Customer Portal for the above mentioned versions.

    Our priority program "Ecodesign" focuses on developing products with proven low environmental impact.
    At Diehl Metering, sustainability is part of our DNA. That is why some of our products are entirely developed to meet an ecodesign approach. All life cycle stages of our products are considered when we do Ecodesign. The goal behind this continuous improvement cycle is to reduce the environmental impact of our products compared to the previous generation. This means that we use raw materials efficiently, that we optimize resources and minimize waste.

    Want to know more? Please get in touch with your Sales Representative.