Kobold DF-WM Switch Vane Flow Meter

 The established vane technology has proven itself a million times worldwide for measuring and monitoring the flow of different mediums in pipelines. Flowmeters/monitors work with this proven principle and offer many benefits. The heart of the new vane is an embedded ring magnet; it is hermetically sealed from the flow medium. It transfers, in a non-contacting manner, the rotary motion of the vane to a Hall sensor attached to the case (in order to save space). This converts the rotary motion to a frequency signal that is proportional to the flow rate.

The downstream evaluating electronics can output this signal to a display, convert it to (0(4)-20 mA, 0-10 V) analogue signal, or count it. It may also be used to switch with up to two limit contacts. The ready and control states of the limit value relay are indicated by LEDs.

The modular design of flow monitors and measuring instruments is a system that can be universally applied; it is reasonably priced; and requires minimum space when in service. Very precise measurement results can be achieved, under tough operating conditions along with the electronics. The system is assembled with the electronics and delivered ready for service. The electronics are adjusted and tuned for use with the sensor. When retrofitted for other measuring ranges, the system may be re-adjusted with a similar device at any time.

The DF- ... WM evaluating electronics is used in applications where sporadic flow rate measurement is  required, or where simultaneous continuous monitoring is needed. It converts the digital frequency signal from the sensor to a limit contact.

The limit value over the entire measuring range can be set with a potentiometer with calibrated scale. The ready state is indicated by a green LED. When the flow rate drops below the setpoint, a red LED flashes. The relay can be shorted and disabled by pressing a button. The flow rate can be determined and the potentiometer scale can be read by rotating the potentiometer from the largest to the smallest value (until the red diode flashes).

The front panel on the electronics  and vane are displaced by 180°. This means that the operator can see from two directions whether flow is available.

The power supply of the device and the relay output are connected with a 7-pin connector or a 1.5 m cable. (A cable can only be used for flange connection.)

Measuring / switching range:
0.08 - 0.5 l/min ... 40 - 160 l/min water
Connection: G ⅛ ... G 1½, flange DN15 ... DN50,
brass, stainless steel, trogamide, polysulfone, PVDF
pmax: 6 / 10 / 16 / 100 bar
tmax: 80°C
Accuracy: ±2.5 % of full scale

Evaluating Electronics 

  • intermittent measuring and continuous monitoring
  • 1 limit value relay
  • pushbutton and scale potentiometer for sensing the flow rate

Technical Details

  • Accuracy: ±2.5% f. s.
  • Power supply:
    24 VDC +15% / -10%
    24, 110, 230 VAC ±20%
  • Power input: 3.5 W max.
  • Output: changeover contact max. 250 V/ 5 A contact resistance ≤100 mΩ
  • Ambient temperature: -25 °C ... +80 °C
  • Protection type: IP 65, all-insulated

Download Datasheet: Kobold DF-WM Switch Vane Flowmeter

Reference : kobold.com