Kobold DFT Rotating Vane Flowmeter

 The established vane technology has proven itself a million times worldwide for measuring and monitoring the flow of different media through piping. KOBOLD flowmeters/monitors work with this proven principle and offer may benefits. The heart of the new KOBOLD 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 KOBOLD 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 up to two limit contacts. The ready and control states of the limit value relay are indicated by LEDs.

The modular design of KOBOLD 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 KOBOLD 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 readjusted with a similar device at any time.

Measuring / switching range:
0.2 - 2.0 ... 3 - 60 l/min water
Connection: G ¼ ... G ¾, ¼ ... ¾" NPT
Material: PTFE
p_max: 5bar
t_max: 80°C
Accuracy: ±2.5 (5) % of full scale
Pulse output

 

 

Measuring / switching range:
0.2 - 2.0 ... 3 - 60 l/min water
Connection: G ¼ ... G ¾, ¼ ... ¾" NPT
Material: brass
p_max: 16 bar
t_max: 80°C
Accuracy: ±2.5 (5) % of full scale
Pulse output

 

Measuring / switching range: 0.2 - 2.0 ... 3 - 60 l/min water
Connection: G ¼ ... ¾ female thread, ¼ ... ¾" NPT female thread
Material: PTFE (housing), ceramic (axle)
p_max: 5 bar
t_max: -20 ... +80°C
Output: 1x analogue (0)4 ... 20 mA, 2x relays
Power supply: 24 V_DC ±20 %, 3-wire
Accuracy: ±2.5 % of full scale 

Fields of Application

The KOBOLD meters/monitors are suitable for the following applications:

• Cooling water monitoring
• General mechanical engineering
• Waste water treatment
• All heavy goods industry
• Chemical industry

Specifications

Technical Details

Sensor

• Measuring accuracy: 2.5% f. s. 5% f. s. (DFT-..0000)
• Medium temperature: -20...+80°C
• Ambient temperature: -20...+80°C
• Max. operating pressure: 5 bar (PTFE housing) 16 bar (brass housing)
• Max. pressure loss: see table
• Protection: IP65

Materials

• Housing/cover: PTFE or brass
• Vane: PTFE
• Axle: ceramics Al2O3 or sapphire
• Bearing: PTFE
• Gasket: NBR (DFT-11..; DFT-16..) FEP-O-seal with silicone (DFT-13..; DFT-18..)
• Front- and back panel: aluminium, black anodised (DFT-13..; DFT-18.. only; not media-contacting)
• Screwing: stainless steel

Electronics

1. Frequency output (OEM)

• Power supply: 5-24 VDC
• Power input: approx. 5 mA
• Signal amplitude high: approx. power supply
• Signal amplitude low: ≤ 0.2 V
• Output loss: max. 2.5 mW
• Electrical connection: connector DIN 43650
• Pulse output: NPN, open collector, max.15 mA

2. Frequency output (option frequency divider)

• Power supply: 24 VDC ± 20%
• Power input: 40-50 mA
• Signal amplitude high: approx. power supply
• Signal amplitude low: ≤ 0.2 V
• Output loss: max. 2.5 mW
• Electrical connection: connector DIN 43650
• Division factor (option): 0.25...2 factory set
• Pulse output: PNP, open collector, max. 20 mA

3. Analogue output (L electronics)

• Power supply: 24 VDC ±20%
• Output: 0-20 mA or 4-20 mA, 3-wire or 2-wire (2-wire 4-20 mA only)
• Max. load: 500 Ω
• Electrical connection: connector DIN 43650

4. Analogue output (MA electronics)

• Power supply:
  24 VDC +15% / -10%
  24/115/230 VAC ±20%
• Power input: 3.5 W max.
• Output: 0(4)-20 mA or 0-10 V (floating, 24 VDC non-isolated)
• Max. load: 500 Ω
• Electrical connection: 1.5 m cable connection or connector

5. Switching output (WM electronics)

• Power supply:
  24 VDC +15% / -10% 2
  4/115/230 VAC ±20%
• Power input: 3.5 W max.
• Output: changeover contact, max. 250 V/5A
• Contact resistance: <100 mΩ
• Electrical connection: 1.5 m cable connection or connector

6. K electronics with digital display, MIN/MAX contact, analogue output

• Power supply: 24 VDC +15% / -10%
• Power input: 5 W max.
• Analogue output: 0(4)-20 mA or 0-10 V
• Max. load: 500 Ω
• Switching output: MIN- and MAX-changeover contact, max. 24 V/2A
• Hysteresis: 2.5% of measured value
• Electrical connection: 1.5 m cable connection

Electronics

1. DFT-...Exxx (counter electronics)

• Display: LCD module, 2 x 8-digit, illuminated, total, part and flow quantity; units of measurement selectable
• Quantity meter: 8-digit
• Analogue output: (0)4...20 mA selectable
• Load: 0...500 Ω or 0-10 VDC,
• Load: > 100 kΩ
• Relay outputs: 2 relays, max. 250 V/5 A/1000 VA
• Control elements: 4 keys
• Functions: reset, MIN/MAX-memory, flow monitor, part and total quantity monitoring, language
• Power supply: 24 VDC ± 20%, 3-line
• Power input: approx. 100 mA
• Electr. connection: 10-pin cable connection or 2 x plug M12 (5-/ 8-pin)

2. DFT-...Gxxx (Dosage electronics)

• Display: LCD module, 2 x 8-digit, illuminated, total, part and flow quantity; units of measurement selectable
• Quantity meter: 8-digit
• Dosage meter: 5-digit
• Analogue output:
  (0)4...20 mA selectable
  Load: 0...500 Ω or 0-10 VDC,
  Load: > 100 kΩ
• Relay outputs: 2 relays, max. 250 V/5 A/1000 VA
• Control elements: 4 keys
• Functions: dosage (relay S2), start, stop, reset, fine dosage, correction quantity, flow monitor, total quantity monitoring, language
• Power supply: 24 VDC ± 20%, 3-line
• Power input: approx. 100 mA
• Electr. connection: 10-pole cable connection or 2 x plug M12 (5-/ 8-pin)

Frequency/Pressure-loss Table

Measuring range   [l/min]	Brass housing			PTFE housing
	Oriface [mm]	Frequency at max. value	Pressure loss at max. value	Oriface [mm]	Frequency at max. value	Pressure loss at max. value
0.2-2.0	2.0	approx. 70 Hz	0.8 bar	2.0	approx. 80 Hz	0.7 bar
0.5-7	4.3	approx. 85 Hz	0.6 bar	4.3	approx. 95 Hz	0.5 bar
1-16	5.9	approx. 130 Hz	0.8 bar	5.9	approx. 140 Hz	0.7 bar
2-36	9.0	approx. 130 Hz	0.8 bar	9.0	approx. 120 Hz	0.9 bar
3-60	13.5	approx. 85 Hz	0.8 bar	13.5	approx. 80 Hz	0.9 bar

Download Datasheet: Kobold DFT Pulse Output Rotating Vane Flowmeter

Reference : kobold.com