Kobold DVK-12 User manual

Operating Instructions
for
Calorimetric Flow Meter, Monitor,
Totalizer
Model: DVK

DVK
page 2 DVK K07/0422
1. Contents
1.Contents ........................................................................................................ 2
2.Note .............................................................................................................. 3
3.Regulation Use ............................................................................................. 3
4.Operating Principle ........................................................................................ 4
5.Instrument Inspection .................................................................................... 4
6.Mechanical Connection ................................................................................. 5
6.1.Check Operating Conditions ................................................................ 5
6.2.Installation ............................................................................................ 5
7.Electrical Connection .................................................................................... 6
7.1.General ................................................................................................ 6
7.2.Compact Version DVK-12... ................................................................. 6
7.3.Separate Version DVK-22.., DVK-42.. ................................................. 7
8.Commissioning.............................................................................................. 7
8.1.General ................................................................................................ 7
8.2.Flow Rate Setting ................................................................................ 8
8.3.Error Connection ................................................................................ 12
9.Technical Information .................................................................................. 12
10.Order Codes ............................................................................................... 14
11.Dimensions ................................................................................................. 15
12.EU Declaration of Conformance ................................................................. 18
Manufactured and sold by:
Kobold Messring GmbH
Nordring 22-24
D-65719 Hofheim
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]
Internet: www.kobold.com

DVK
DVK K07/0422 page 3
2. Note
Please read these operating instructions before unpacking and putting the unit
into operation. Follow the instructions precisely as described herein.
The instruction manuals on our website www.kobold.com are always for currently
manufactured version of our products. Due to technical changes, the instruction
manuals available online may not always correspond to the product version you
have purchased. If you need an instruction manual that corresponds to the
purchased product version, you can request it from us free of charge by email
([email protected]) in PDF format, specifying the relevant invoice number and
serial number. If you wish, the operating instructions can also be sent to you by
post in paper form against an applicable postage fee.
The devices are only to be used, maintained and serviced by persons familiar
with these operating instructions and in accordance with local regulations
applying to Health & Safety and prevention of accidents.
When used in machines, the measuring unit should be used only when the
machines fulfil the EC-machine guidelines.
as per PED 2014/68/EU
In acc. with Article 4 Paragraph (3), "Sound Engineering Practice", of the
PED 2014/68/EU no CE mark.
Diagram 6, Pipe, Group 1 dangerous fluids
3. Regulation Use
Any use of the device, which exceeds the manufacturers specification may
invalidate its warranty. Therefore, any resulting damage is not the responsibility of
the manufacturer. The user assumes all risk for such usage.

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page 4 DVK K07/0422
4. Operating Principle
The digital KOBOLD flow meter/monitor model DVK serves to measure and
monitor small and average flows of air in piping and hoses.
The device is absolutely maintenance-free and uses the calorimetric method.
When the operating voltage is applied, a thermistor integrated in the sensor is
heated to a defined value above the medium temperature. When air (or gas)
flows through the sensor, the heat generated in the sensor is absorbed by the
medium. This means that the sensor is cooled down to the medium temperature.
Depending on the velocity and rate of flow, the temperatures are equalized and
the resistance of the sensor is reduced proportionally. The flow velocity can be
determined by measuring the resistance. The medium temperature is measured
by a second sensor.
The resistance values of both sensors are compared by the electronics over a
Wheatstone bridge circuit and an output relay is actuated if the set switching
values have been fallen short or exceeded. The switch state is signalled by two
LED’s (ON: LED on; OUT 1*: green, OUT 2*: red).
The digital KOBOLD flow meter type DVK works with practically no pressure loss.
Typically, the device is available in two different versions (display and sensor as
compact instrument, or display and sensor separated but connected with a cable)
with the necessary screw connections.
* The two outputs OUT 1 and OUT 2 can only be activated by flow measurement per unit of time,
and not by totalising.
5. Instrument Inspection
Instruments are inspected before shipping and sent out in perfect condition.
Should damage to a device be visible, we recommend a thorough inspection of
the delivery packaging. In case of damage, please inform your parcel service /
forwarding agent immediately, since they are responsible for damages during
transit.
Scope of delivery:
The standard delivery includes:
 Calorimetric Flow Meter, Monitor, Totalizer Model: DVK-…

DVK
DVK K07/0422 page 5
6. Mechanical Connection
6.1. Check Operating Conditions
 flow rate
 max. operating pressure
 max. operating temperature
 medium
6.2. Installation
 flow in direction of arrow (position independent)
 avoid pressure and radial tension
 fasten the pipe at up stream and down stream at a distance of 50 mm from the
connections
 check sealing of connections

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page 6 DVK K07/0422
7. Electrical Connection
7.1. General
Attention! Make sure that the voltage values of your system
correspond with the voltage values of the measuring unit.
7.2. Compact Version DVK-12...
 Make sure that the lines are powerless.
 Connect the supply voltage and the output signal to the plug PIN´s as below:
Attention! A wrong connection of plug connection can lead to
damage of the unit’s electronics.

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DVK K07/0422 page 7
7.3. Separate Version DVK-22.., DVK-42..
 Make sure that the supply wires are de-energized.
 Connect the supply voltage and the output signal to the plug PIN´s as given
below.
Attention! A wrong connection of plug connection can lead to
damage of the unit’s electronics.
8. Commissioning
8.1. General

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page 8 DVK K07/0422
8.2. Flow Rate Setting
8.2.1. Setting Procedure
8.2.2. Initial Setting

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DVK K07/0422 page 9
8.2.3. Flow Rate Setting Mode (manual)

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page 10 DVK K07/0422
8.2.4. Flow rate setting mode (auto preset)

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DVK K07/0422 page 11
8.2.5. Other functions

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8.3. Error Connection
9. Technical Information
Method of measurement: calorimetric principle
Mounting position: any position, flow in direction of arrow
Measuring ranges: 1...10 l/min; 10...100 l/min
(switchable to CFMx 10-2);
20...200 l/min; 5...50 l/min;
50...500 l/min
(switchable to CFMx 10-1 )
air at 0 °C; 1013 mbar or 20 °C; 1013 mbar)
Accuracy: ±5 % of f. s.
Repeatability: ±1 % of f. s. (DVK-...01/DVK-...05)
±2 % of f. s. (other types)
Temperature
characteristic: ±3 % of f. s. (15 – 35 °C)
±5 % of f. s. (0 –50 °C)
Operating pressure: -0.5…+5.0 bar (DVK-…01/DVK-…05)
testing pressure 10 bar
-0.5…+7.5 bar (DVK-…10 / 20 / 50)
testing pressure 10 bar
Pressure loss at
full scale: see table
Operating temperature: 0…50 °C

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DVK K07/0422 page 13
Material:
Connections: ADC aluminium die casting
Sensor and housing: PPS/lead-glass/PtIr/FeNi/OFC
Sieve: stainless steel
Gasket: NBR
Response time: 1 s
Connections: G ¼; G ⅜; G ½
Display: 3-digit 7-segment LCD,
90° rotatable
Totalizing: 0...999999 (litres or ft3 x 10-1), resettable
Supply: 12...24 VDC, max. 170 mA
Outputs: 2 x PNP open collector, 80 mA
Switching indication: 2 x LED (OUT 1: green, OUT 2: red)
Minimum
switching adjustment: 0.5 % of max. range value
Hysteresis: adjustable
Shock resistance: 490 m/s2 in X-, Y-, Z-direction
(3 x each direction)
Vibration resistance: 10…500 Hz at amplitude
<1.5 mm or acceleration
of 98 m/s2 in X-, Y-, Z-direction
(2 hours per direction)
Protection: IP 65
Weight: < 290 g (without connecting lead)
(G ¼; G ⅜; G ½)

DVK
page 14 DVK K07/0422
10. Order Codes
Example: DVK-12 01R08
Description Model Measuring
ran
g
e/connection
Output
Flow meter
compact version DVK-12... 01R08 = 1-10 l/min; G¼
05R08 = 5-50 l/min; G¼
10R10 = 10-100 l/min; G⅜
20R10 = 20-200 l/min; G⅜
50R15 = 50-500 l/min; G½
3PP = 2x PNP switching
outputs
Flow meter
sensor unit * DVK-22...
Display unit for DVK-22
panel mountin
g
DVK-42...
*A display unit DVK-22 is required for the sensor unit DVK-42. Alternatively, 4-20 mA output is
available on request.
Accessories: Electrical connection
Pressure loss
Model DVK-...01 DVK-...05 DVK-...10 DVK-...20 DVK-...50
ME
(
l/min
)
10 50 100 200 500
Pressure loss
(
mbar
)
12 30 100 200 450
Description Model
M12x1 box with 2 m cable ZUB-KAB-12K002
M12x1 box with Quickon-connector ZUB-KAB-12Q000

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DVK K07/0422 page 15
11. Dimensions
[mm]
Compact design DVK-1201..., DVK-1205...
Electrical connection
Pin numbers
Connector thread M12
Numbers Pin name
1 DC
(
+
)
2 OUT 2/analo
g
ue output
3 DC
(
-
)
4 OUT 1

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page 16 DVK K07/0422
Display unit DVK-42 for panel mount
Compact design DVK-1210..., DVK-1220..., DVK-1250...

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DVK K07/0422 page 17
Separate design DVK-2201..., DVK-2205...
Separate design DVK-2210..., DVK-2220..., DVK-2250...
A B
48 62
A B
42 62

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12. EU Declaration of Conformance
We, KOBOLD-Messring GmbH, Hofheim-Ts, Germany, declare under our sole
responsibility that the product:
Calorimetric Flow Meter, Monitor, Totalizer Model: DVK
to which this declaration relates is in conformity with the standards noted below:
EN 61000-6-2:2005 Electromagnetic compatibility (EMC) - Part 6-2:
Generic standards - Immunity for industrial environments
EN 55011:2009+A1:2010 Industrial, scientific and medical equipment - Radio-
frequency disturbance characteristics - Limits and methods of measurement
EN 50581:2012 Technical documentation for the assessment of electrical
and electronic products with respect to the restriction of hazardous substances
Also, the following EC guidelines are fulfilled:
2014/30/EU Electromagnetic compatibility
2011/65/EU RoHS
Hofheim, 08 Dec. 2020
H. Peters M. Wenzel
General Manager Proxy Holder