Kobold Kal-K Operating Manual
Operating Instruction
for
Electronic Flow Meter / Monitor
Compact Version
Model: KAL-A
KAL-AK
KAL-A(K)
1. Contents
...Contents ........................................................................................................ 2
1.
2....Note .............................................................................................................. 3
3....Instrument Inspection .................................................................................... 3
4....Regulation Use .............................................................................................. 3
5....Operating Principle ........................................................................................ 4
6....Mechanical Connection ................................................................................. 5
7....Electrical Connection .................................................................................... 5
8....Output ........................................................................................................... 8
9....Commissioning .............................................................................................. 9
10..Maintenance ............................................................................................... 12
11..Diagnostics ................................................................................................. 12
12..Technical Information .................................................................................. 12
13..Order Codes ............................................................................................... 13
14..Dimensions ................................................................................................. 14
15..EU Declaration of Conformance .................................................................. 15
Manufactured and sold by:
Kobold Messring GmbH
Nordring 22-24
D-65719 Hofheim
Tel.: +49(0)6192-2990
Fax: +49(0)6192-23398
E-Mail: info.de@kobold.com
Internet: www.kobold.com
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KAL-A(K)
2. Note
Please read these operating instructions before unpacking and putting the unit
into operation. Follow the instructions precisely as described herein.
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.
3. 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.
4. Regulation Use
The KOBOLD KAL-A.. Flow Meter is intended for use in measuring moderate
flow rates of low-viscous or dirty liquids.
The KOBOLD KAL-AK.. Flow Meter is intended for use in measuring and
monitoring moderate flow rates of low-viscous or dirty liquids.
Analogue Output / Limiting Signal
For measuring the flow rate of the liquids the device is equipped with a 4-20 mA
output signal. Additionally the model KAL-AK.. is equipped with a limit switch
(NPN or PNP).
Trend Display
A LED bar graph display indicates the current flow rate and the set point
(KAL-AK) via a flashing LED.
Sensor
The model KAL-A and KAL-AK consists of a sensor with integrated electronic.
The devices may only be used for liquids to which the probe material is resistant.
With proper installation and maintenance, the probes are not sensitive to soiling
and cause practically no pressure loss.
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KAL-A(K)
Materials
Sensor Stainless steel (1.4301, 1.4305, 1.4571)
Electronic cover Glass fibre reinforced polyamide
Setting ranges
in relation to nominal tube diameter
ID (mm) Meas. range (L/min) water ID (mm) Meas. range (L/min) water
8 0.12 - 6.0 40 3.0 - 150
10 0.19 - 9.4 50 4.7 - 235
15 0.42 - 21.8 60 6.8 - 340
20 0.75 - 37.7 80 12.0 - 603
25 1.18 - 59.0 100 18.8 - 942
30 1.7 - 84.8 150 42.4 - 2120
Attention! The flow ranges specified in the table above have been
calculated for each pipe diameter based on the known velocity
range of the KAL-A(K). It must be noted that flow in pipes is nonuniform across the pipe cross section, and approaches zero at the
pipe wall. This means that, in practice, the depth of installation of
the probe, the internal pipe diameter, and the flow profile of the
liquid in the pipe can interact to produce significant deviations from
the flow ranges in the above table.
5. Operating Principle
The KAL-A... Flow Meter/ -Monitor uses the proven thermal dispersion principle
and operates as follows: The probe is heated internally to a few degrees above
the temperature of the medium into which it extends. The flowing medium takes
this heat off the probe, i.e. the probe is cooled down. The cooling rate is
proportional to the flow rate. The electronic converts the signal into a proportional
current signal (4-20 mA) linear to the flow rate. With model KAL-AK the requested
flow rate will be compared with the flow rate existing and if the set- point is
reached a PNP/NPN switch is activated. The microprocessor-controlled design
permits simple calibration and set-up. The compact probe design permits
monitoring of flow rate with minimum pressure loss.
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6. Mechanical Connection
Prior to installation
Ensure that the actual system flow rate the is within the measuring range of
the KAL-A(K).
Ensure that the maximum system temperature and pressure are within the
limits specified per section (see section 12. Technical Information)
Fitting
Mount the sensor into the piping and make sure that it is completely filled with
fluid. The probe tip has to reach at least 5 mm (better > 5 mm) into the pipe (see
below).
Fitting position
The sensor can be mounted in any orientation
as long as the piping is completely filled with
fluid. The mounting position has to be smooth
and free of turbulence.
(Recommended input and output length: 5 x
pipe diameter, of straight - run piping both
upstream and downstream of the flow switch).
In case of sediments in the pipe the shown
Se dim e nts
mounting position is recommended.
7. Electrical Connection
Screw in sensor.
Remove electronic cover.
(The fixing screws are secured against falling out)
Strip 4-wire cable (approx. 40-60 mm) and pull through cable gland.
Tighten cable gland.
Connect wires to terminal connector block according to their functions.
Ensure that the power is disconnected during the connection of the cable.
Attention! SET-pushbutton must not be pressed while switching
supply voltage on.
After connection, apply supply voltage of 24 VDC ± 20% (see Technical
Information)
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