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Kobold DF-Z Counter Vane Flow Meter

Overview

KOBOLD measuring sensors are available with pipe thread or flange connections; standard or high-pressure versions are optional. The standard version is delivered with a standard front cover from solid, transparent plastic, which allows the flow to be optically inspected. The rotary motion of the shining red vane can be clearly seen. Faults such as power failure or rotor blockage can thus be quickly detected in situ. In addition to their use as measuring and
monitoring systems, the devices can also be used as flow indicators.

The standard front cover is replaced by a metal plate on the high-pressure version (up to 100 bar with the threaded version). The devices can be installed in any position. However, the flow must always be in the direction of the arrow, and the front panel of the device must be arranged in the vertical plane. The fluidic housing must be full of liquid. Additional inlet or outlet pipes are not required.

The large radial clearance between the vane and the housing wall renders the measuring sensor insensitive to dirt. Depending on the version, the connection fittings can be rotated and are bearing mounted. Switching electronics or vane front may be rotated at will for ease of viewing (while in service).

The KOBOLD measuring sensors are also available without a compact electronic. The linear flow proportional pulse signal provided by the sensor can be controlled by the customer’s electronics. The customer can integrate the sensor directly into the electronics with the OEM version (implement EMC-immunity) and can therefore save costs and material.

Description

The DF-ZL flow meter’s electronics convert the frequency signal generated by the rotating vane into a numeric flow reading displayed on the top line of the LCD display, total flow volume since reset on the bottom, and a scalable analog output signal. Two relays with SPDT contacts are included and may be utilized for various functions.

The relays may also be set to activate when a specific volume has been exceeded. Freely-adjustable switching points, hysteresis, window point, and switch-on/switch-off delay may be set as desired for each relay. Red status LEDs clearly indicate the switching status of each relay.

Kobold DF-Z Counter Vane Flow Meter The evaluation unit changes the frequency signal of the pickup into a 3(4)-digit flow reading with a selectable measurement unit (top display line), and into a scalable analog signal. The flow quantity is added up in a part quantity meter and a total quantity meter and then displayed at the bottom line of the screen. The quantity meter’s units of measurement are selectable.

The two relays with floating output changeover contacts continuously monitor if the freely adjustable limits are exceeded or fallen short. Here, it is possible to choose between the threshold value and window monitoring.

A switching point, hysteresis, a window point, and switch on or off delay can be set separately for each relay. The switching points can also be set directly by using the control keys.

Without having to change over to the menu. Alternatively, it is also possible to monitor the quantity meter to see if it is exceeded. A red LED indicates the switching status.

The analog output is optionally available as current output with 0(4)… 20 mA or as voltage output with 0…10 V. The parameter names can be shown in the menu in German or English. If used where the flow readings change rapidly, the display can be pacified and the analog reading averaged by switching on some software.

A Min./Max. reading memory determines the extreme readings of the flow. The display of the readings and the resetting is achieved by using the keys without having to change the menu. Resetting by using the keys can also be blocked. If the maximum set flow (exceeded range) is exceeded, it will be shown on the display. The set parameters can be protected against unauthorized alteration by using a password function.

Kobold DF-Z Evaluating electronics

  • Measuring and metering
  • LED display
  • Output 0(4)-20 mA 0-10 VDC
  • 2 adding meters
  • 2 relays freely programmable

Range of Functions

Quantity meter and flowmeter with digital display, switch, and analogue output:

  • Measurement and display of total, part, and flow quantities
  • Control input for part quantity reset
  • 2 switching outputs, freely programmable as flow monitor or for monitoring the part and total quantity
  • Analog output 0(4)-20 mA or 0-10 V Min./Max. memory

Kobold DF-Z Specifications

  • Accuracy: ±2.5% f.s.
  • Display: 2 x 8-digit LCD module, illuminated total, part and flow quantity, units of measurement are selectable
  • Quantity meter: 8 digits
  • Power supply: 24 VDC ±20%, Current consumption: approx. 100 mA
  • Electrical connection: 10-wire cable connection
  • Analogue output: 0(4)… 20 mA selectable
  • Load: 0… 500 ? or 0 …10 VDC, Load: >100 k?
  • Switching output: 2 relays, max. 30 V / 2 A
  • Control elements: via 4 keys
  • Functions: reset function, Min./Max.-memory, flow monitor, monitoring of part and total quantities, language
  • Protection type: IP 65

Kobold DF-Z Model Product

Paddle Wheel Flow Sensors DF-ZL – Flowmeter with Totalizer

Special Features

  • Ditigal Display: Rate, Total, and Grand Total
  • Output: 2 SPDT Relays Fully Programmable
  • Output: 4-20 mA or 0-10 VDC

Specifications

  • Display: 2x 8-digit, 7-segment
  • LED with fixed decimal place
  • Temperature Range: –10…180 °F (145 °F for DF-..A..)
  • Protection: NEMA 4
  • Wiring: 5 foot cable, 10-wire (standard) Extended cable (optional)
  • Power Consumption: 2.4 W max.
  • Power Supply: 24 VDC, ±20%
  • Contact Rating: 250 V, 5A max
  • Contact Resistance: <100 m?
  • Analog Output: 4-20 mA
  • Max Load: 500 ?, 4-20 mA, or >100 k? 0-10 VDC
  • Temperature Range: 0…180 °F (145 °F for DF-..A..)
  • Protection: NEMA 4

Kobold DF Series Other Model

Paddle Wheel Flow Sensors DF Series

The main feature of the DF flow sensors is the incorporation of a multipole magnet ring embedded into the paddlewheel. As the paddle wheel rotates,  the magnets, hermetically separated from the liquid media, induce a DC signal into a Hall-Effect sensor mounted on the device housing. Since the DC signal frequency is proportional to paddlewheel rotation, an accurate flow rate reading is possible.

The DF sensors, when coupled with the appropriate KOBOLD electronics unit, can offer the user a number of features useful in the measurement and control of low-viscosity liquid flow. These features include a  frequency output, analog output, adjustable switches, digital displays with integrated batch controllers, or totalizers.

 Specifications

  • Accuracy: ± 2.5% of the full scale
  • Media: Water and low
  • viscosity liquids
  • Orientation: Universal
  • Fittings: 1/8″ NPT … 1-1/2″ NPT

Paddle Wheel Flow Sensors DF Sensor – Frequency Output

The KOBOLD DF Flow Sensor is used in applications where flow measurement is desired and flow rate data is to be transmitted as a pulse rate output. The DF Flow Sensor contains a flow transducer that transmits a pulse signal. The output signal is linearly proportional to the flow and is transmitted by a bipolar transistor operating in an open collector configuration (max. 10 mA sinking capability). A user-supplied, pull-up resistor is required to produce a signal output.

Specifications

  • Power Supply: 5 to 24 VDC
  • Signal Output: NPN – Open Collector 10 mA max.
  • Temperature Range: -4…176 °F (140 °F for DF-01..)
  • Protection: IP 65
  • Accuracy: ± 2.5% of F.S.

Paddle Wheel Flow Sensors DF-MA – Analog Transmitter

Special Features

  • For Transmission of Measured Flow
  • Output: 0(4)–20 mA, 0-10 VDC, 0-5 VDC

Specifications

  • Power Consumption: 3.5 W max.
  • Power Supply: 24 VDC, 24 VAC, 110 VAC, 230 VAC + 15% / –10%
  • Analog Output: 0-20 mA, 4-20 mA, 0-5 VDC or 0-10 VDC
  • Max Load: 500 ?
  • Temperature Range: –10…180 °F (145 °F for DF-71..)
  • Cable Connections: (5 ft PVC-cable standard,
  • Plug connection optional)
    • No. 1 Power (–)
    • No. 2 Power (+)
    • No. 5 Analog Output (+)
    • No. 6 Analog Output (–)

Paddle Wheel Flow Sensors DF-WM – Switch

Special Features

  • Adjustable Limit Contact for Flow Control
  • Push-Button Alarm Override Switch and Potentiometer with Scale for Indirect Flow Measurements

Specifications

  • Power Consumption: 3.5 W max.
  • Power Supply: 24 VDC, 24 VAC, 110 VAC 230 VAC + 15% / –10%
  • Rating: 250 V max./5A
  • Contact Resistance: = < 100 ?
  • Temperature Range: –10…180 °F (145 °F for DF-81..)
  • Cable Connection: (5 ft PVC-cable standard,
  • Plug connection optional)
    • No. 1 Power Supply (-)
    • No. 2 Power Supply (+)
    • No. 3 Relay Contacts
    • No. 4 Relay Contacts
    • No. 5 Relay Contacts

Paddle Wheel Flow Sensors DF-DL – Flowmeter with Batch Controller

Special Features: DF-..DL

  • Digital Display: Rate, Totalizing, and Batching
  • Subtracting and Adding Totalizer
  • Output: 2 SPDT Relays Fully Programmable
  • Batching Relay and 1 Limit Relay
  • Output: 0(4)-20 mA or 0-10 VDC

Specifications

  • Display: 2x 8-digit, 7-segment
  • LED with fixed decimal place
  • Temperature Range: –10…180 °F (145 °F for DF-..A..)
  • Protection: NEMA 4
  • Wiring: 5-foot cable, 10-wire (standard)
  • Extended cable (optional)
  • Power Consumption: 2.4 W max.
  • Power Supply: 24 VDC, ±20%
  • Contact Rating: 250 V, 5A
  • Contact Resistance: <100 m?
  • Analog Output: 0(4)-20 mA
  • Max Load: 500 ?, 4-20 mA, or >100 k? 0-10 VDC
  • Temperature Range: 0…180 °F (145 °F for DF-..A..)
  • Protection: NEMA 4

Paddle Wheel Flow Sensors DF-KL – Digital Flowmeter

Special Features

  • Digital Display: Continous Rate with Bargraph
  • Output: 2 SPDT Relays Fully Programmable
  • Output: 4-20 mA or 0-10 VDC

Specifications

  • Display: 3-digit, 7-segment LED with the fixed decimal place and bar graph indicator
  • Temperature Range: –10…180 °F (145 °F for DF-..A..)
  • Protection: NEMA 4
  • Wiring: 5-foot cable, 10-wire (standard)
  • Extended cable (optional)
  • Power Supply : Voltage: 24 VDC, ±20%
  • Consumption: Approx. 100 mA analog output
  • Current Output: 4–20 mA
  • Load: 500 ohm max
  • Voltage Output: 0–10 VDC
  • Load: > 100 kohm
  • Relays: 2 SPDT: 1 Minimum, 1 Maximum
  • Contact Rating: 2 amps at 30 Volts max
  • Hysteresis: 2.5% of full scale
  • Set Points: Front panel adjustable

Download Datasheet: Kobold DF-Z Counter Vane Flowmeter

Reference: kobold.com

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