Kobold DPT Torsion Paddle Flowmeter

The patented KOBOLD torsional paddle flowmeter type DPT operates according to the diaphragm plate principle. For the first time a flat torsion spring simultaneously acts as a mount for the paddle and as an elastic force. The device thus operates with almost no wear. The paddle comprises a diaphragm plate (1) and a lever arm (2). When the diaphragm plate is moved by the flow in the flow direction, the lever arm is deflected by the force of the leaf spring. This angular motion is transferred non-contacting through the casing wall by a magnet (3) to a Hall-effect sensor (4) with no losses. Different measuring ranges and instrument sizes are realized with the geometry of the lever arm, the diameter and shape of the diaphragm plate as well as the height and thickness of the leaf spring. Calibration nozzles (5) can also be press-fitted to adapt the measuring ranges. The signal from the Hall-effect sensor is displayed by different electronic means and serves to monitor the volume flow.

Measuring range: 5 - 30 ... 850 - 1900 l/min water
Connection: G ⅜ ... G 3, ⅜ ... 3" NPT
Material: brass, stainless steel
pmax: PN40
tmax: 80°C
Accuracy: ±3 % of full scale


Areas of Application

  • Mechanical engineering and capital equipment
  • Chemical and pharmaceuticals industries
  • Heavy goods industry
  • Drinks and semi-luxury food industry


Technical Details

  • Accuracy: 3% of full scale
  • Mounting position: horizontal
  • Process temperature: max. 80 °C
  • Ambient temperature: max. 80 °C
  • Max. operating pressure: PN 40/20 °C
  • Protection type: IP 65


  • Case: brass
  • stainless steel 1.4581 Paddle, spring strip: stainless steel 1,4571
  • Calibration nozzles: stainless steel 1.4571
  • Seals: brass version: NBR
  • stainless steel version: FPM
  • Magnet: oxide ceramics


Compact Electronics

  • Display: 3-segment LED
  • Analogue output: (0)4...20 mA adjustable, max. 500 Ω
  • Switching outputs: 1 (2) semiconductor PNP or NPN set at the factory
  • Contact operation: programmable N/C/N/O contact
  • Setting: with 2 buttons
  • Supply: 24 VDC ±20%, 3-wire technology,
  • approx. 100 mA
  • Electr. connection: plug connector M12x1

ADI electronics

  • Display: bar graph and 5-digit digital display
  • Analogue output: (0)4...20 mA, 0-10 VDC 2 switching outputs: relay /changeover contact, max. 250
  • VAC/5 A resistive load, max. 30 VDC / 5 A
  • Setting: via 4 buttons
  • Supply:
    100 ... 240 VAC ± 10 % or
    18 ... 30 VAC /10 ... 40 VDC
  • Electr. Connection: pluggable terminal block via cable gland

Download Datasheet: Kobold DPT Torsion Paddle Flowmeter

Reference : kobold.com