Kobold DWN Paddle Bellows Flow Monitor

The new KOBOLD flow monitor DWN 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. In the measuring section a microswitch (6) and a pilot lamp (7) are operated 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.

Switching range: 1 - 25 l/min ... 300 - 3600 m³/h water
Connection: G ⅜ ... G 2, ⅜ ... 2" NPT, flange DN10 ... DN50,
ANSI ⅜ ... 2", weld-on flange DN40 ... DN500
Material: brass, stainless steel, PVC
pmax: PN16
tmax: 100°C
Accuracy: ±3 ... ±5 % of full scale


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


 Material combinationMaterial combinationMaterial combination
Material combination567
T pieceBrassStainl. steelPVC
Connecting threadBrassStainl. steelPVC
Connecting flangeSteel zincplatedStainl. steelPVC
Weld-on flangeSteel sprayed SStainl. steelBoring pipe box PVC
Paddle systemBrassStainl. steelStainl. steel
BellowsStainl. steelStainl. steelStainl. steel
Case meas. sectionStainl. steelStainl. steelStainl. steel
Covering hoodPolycarbonatePolycarbonatePolycarbonate
tmax*100°C100°C20°C (60°C)
pmax*16 bar16 bar16 bar (2 bar

Reference : kobold.com

Another Article:

Kobold FPS Paddle Bellows Flow Monitor
Pulsar Software SMS Server, Ultra Log and Ultra Scan
Pulsar Flow Pulse PC Software
Pulsar PC Software Suite
Battery-Powered Flow Rate Transmitter RT-50 Series AW Lake