Kobold DWU Paddle Bellows Flow Monitor

Kobold DWU Paddle Bellows works according to the diaphragm plate principle. Baffle/paddle (1) is deflected in the flow direction against the force of the spring (2) by the flowing medium. A stainless steel bellows (3) seals off the system hermetically between medium and measuring unit/indicator. The motion is transferred positively from the baffle (1) to the measuring section.

The actual flow rate is displayed in l/min or m3/h on the dial (5) by the pointer (4). In the measuring section a microswitch (6) and a pilot lamp (7) are activated as soon as the set switching point is exceeded or undershot.

Thus the change in flow is clearly signalled locally by the switching point pilot lamp (illuminates for undershooting). At the same time switching operations are triggered by the microswitch, designed as a 3-pole changeover contact. The displacement-deflection technique is one of the most secure systems available as motion is transferred positively from the baffle plate to the measuring section.

With these flow monitors if the T piece becomes clogged up with lime, foreign objects or dirt, the system responds with “no flow”. It is practically impossible for the system to hang up in a position that indicates flow when there is in fact no flow.

Kobold DWU Paddle Bellows Areas of Application

  • Heavy goods industry
  • Rolling mills and mill trains
  • Chemicals and pharmaceuticals industries
  • Drinks and semi-luxury food industry
  • General mechanical engineering and capital equipment
  • Measurement and monitoring of product, cooling and lubricant circuits

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Technical Details

Material combination Material combination Material combination
Device part 5 6 7
T piece Brass Stainl. steel PVC
Connecting thread B Brass Stainl. steel PVC
Connecting flange Steel zincplated Stainl. steel PVC
Weld-on flange Steel sprayed Stainl. steel Boring pipe
box PVC
Paddle system Brass Stainl. steel Stainl. steel
Bellows Stainl. steel Stainl. steel Stainl. steel
Case meas. section S Stainl. steel Stainl. steel Stainl. steel
Covering hood Polycarbonate Polycarbonate Polycarbonate
tmax* 100°C 100°C 20°C (60°C)
pmax* 16 bar 16 bar 16 bar (2 bar)
  • Flow ratio:
    thread connection: max.1:5
    mounting flange: max.1:4
  • Repeat accuracy up:
    up to 20 l/min: ±5%
    21-200 l/min: ±4%
    201 and more l/min: ±3%
    (based on calibration position and medium at 20°C)
  • Pressure loss: 0.1-0.3 bar (average pressure loss, value upon request)
  • Switching hysteresis: up to 2 bar 10% depending on pressure
  • Ambient temperature: max. 70°C
  • Electrical switching capacity: 250 V / 10 A
  • Pilot lamp: 230 VAC, 110 VAC or 24 VDC
  • Protection type: IP55 (IP65 upon request)

Download Datasheet: Kobold DWU Paddle Bellows Flow Monitor

Reference : kobold.com

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