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dpu-durchfluss.png: Paddle Bellows Flowmeter and Monitor DPU

Paddle Bellows Flowmeter and Monitor DPU

For liquids

Measuring range: 3 - 55 l/min ... 50 - 600 l/min water
Connection: R ½ ... R 2, ½ ... 2" NPT, flange DN15 ... DN50, ASME  ½... 2",
Material: brass, stainless steel
pmax: PN16
tmax: 100°C
Accuracy: ±3 ... ±5 % of full scale


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The KOBOLD flowmeter and monitor DPU works according to the paddle bellows system.
Baffle/paddle is deflected in the flow direction against the force of the spring by the flowing medium. A stainless steel bellows seals off the system hermetically between medium and measuring unit/indicator.
The motion is transferred positively from the paddle to the measuring section. The actual flow rate is displayed in l/min or m3/h on the scale by the pointer. In the measuring section a microswitch and a pilot lamp are operated as soon as the set switching point is exceeded or falls short of. Thus the change in flow is clearly signalled locally by the switching point pilot lamp (illuminates if below switch point). 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.

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