RAY FS WP is a Woltman volume measuring device with a built-in pulse transmitter to measure heat for billing hot water consumption (max. 105°C). Its helix axis is parallel to the pipe ensuring low resistance to flowing and limited pressure loss.


  • MI004 approval in class 2 with dynamic range 10:1 (qp:qi)
  • Complete range from DN50 qp 15 m3/h to DN200 qp 200 m3/h
  • Remote transmission of quantities of flow (3 m cable), compatible with calculators with pulse input
  • Installation in any position
  • Register can be rotated as required for easier reading
  • Very low pressure loss
  • Encapsulated and waterproof meter
  • As a safeguard against magnetic influences, a sealable anti magnetic screen is fitted on the meter
  • Temperature range: 10°C to 105°C
  • General
    Mounting positionAny position
    Medium temperature range°C10 ... 105
    Ambient temperature°C5 ... 55
    Ambient classE1 + M1
    Nominal pressurePNbar161
    Protection classIP 54
    ApprovalMID (DE-15-MI004-PTB004)
    1 special version on request
  • Reach

    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)

  • Technical data
    Nominal diameterDNmm506580150200
    Nominal flow rateqpm3/h152532200200
    Overload flow rate (short term)m3/h606090400500
    Maximum flow rateqsm3/h303045300300
    Minimum flow rateqim3/h1.52.53.22020
    Starting flow ratel/h1301304001,5002,000
    Pressure loss at qpΔpbar0.
    Flow resistance coefficient Zeta0.90.90.6510.13
    Pulse value reed switch 1l/pulse1001001001,0001,000
    Dynamic range 2qp / qi10:110:110:110:110:1
    1 other pulse values on request
    2 other qp / qi on request
  • Display range
    Nominal diameterDNmm506580150200
    0.5 l ... 999,999 m³
    5.0 l ... 9,999,999 m³
  • Dimensions
    Nominal diameterDNmm506580150200
    Overall lengthLmm200200225300350
    Flange diameterDmm165185200285340
    Hole circle diameterKmm125145160240295
    Number of screwholespcs44888 / 12
    Screwhole diameterD1mm1818182222
    Height (without counter extension)H1mm141141141244244
    Height (with counter extension)H1mm182182182284284
  • Pressure loss graph / Typical error graph