Page 1
Operating Instruction
for
Small-volume Rotating-vane
Flow Meter
Model: DPL
Page 2
DPL
Page 2 DPL 07/02
1. Contents
1. Contents ............................................................................. 2
2. Note.................................................................................... 3
3. Warranty............................................................................. 3
4. Application .......................................................................... 3
5. Unit Check-up..................................................................... 3
6. Working Principle................................................................ 4
7. Mechanical Connection ...................................................... 4
8. Electrical Connection.......................................................... 5
9. Commissioning ................................................................... 6
10. Maintenance....................................................................... 7
11. Technical Data.................................................................... 7
12. Dimensions......................................................................... 8
13. Declaration of Conformance............................................... 9
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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2. Note
Please read and take note of these operating instructions before unpacking and
setting the unit for operation, and 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 with the prevailing regulation applying to
procedural safety and the prevention of accidents.
3. Warranty
Scope of warranty applies in accordance with our conditions of delivery. Repairs
during the guarantee period require our agreement and instructions, and may
only be carried out through our supplier or one of our approved commission
agents.
4. Application
A trouble-free operation of KOBOLD rotating vane flow meters is ensured only if
all points of consideration described in this manual are well-observed. For
damages, resulting from negligence of these guidelines, the validity of warranty
expires.
5. Unit Check-up
These devices are checked before despatch and sent away in perfect condition.
Should the damage to a device be visible, we recommend an exact inspection of
delivery packing. In case of damage, please inform your postal
service/forwarding agent immediately, since the carrier company is responsible
for any damages during transit.
Scope of delivery
All parts falling under standard scope of delivery are firmly attached with the
device.
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6. Working Principle
The medium flows through a specially formed flow-chamber and causes thereby
an impeller to rotate. This rotating motion is scanned opto-electronically in a
contactless manner and converted into an asymmetrical frequency signal.
Optionally, a frequency divider with symmetrical output is available. The
generated frequency is proportional to the flow rate. The impeller contains
sapphire-bearings, due to which, high linearity and long life of device are
ensured.
7. Mechanical Connection
· Make sure that the actual flow rate corresponds with the measuring range of
the device. The measuring range (full scale value) can be read off from the
type label.
Note! During measuring range over-stepping (more than 20%), damage to
the axle bearings can occur, which impairs the function of the flow meter.
· Make sure that the permitted max. operating pressure and temperature of the
device DPL are not violated.
· Remove all the transportation-safety locks etc. and ensure, that there exist no
packing-material parts inside the unit.
· These units can be mounted without regard to position. Thereby, the flow must
always take place in the direction of the arrow.
· In particular, attention must be paid to flow from top to bottom, such that the
flow chamber is completely filled with the liquid. Additional inlet and outlet
lengths are not required.
· The sealing of connection screw joints is succeeded through Teflon tape or
similar material.
· During installation of the unit, attention must be paid to see that no high
pressure or tensile loads exert on the connection screw joints. We recommend
to fasten an inlet and outlet pipe mechanically at a distance of approx. 50 mm
from the connection screw joint.
· If possible, after mechanical installation, check whether the sealing of
connection-joints/piping is adequate.
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8. Electrical Connection
Note! Ensure that the voltage levels of your supply system are in agreement
with that of flow meter.
· Make sure that the electric supply lines are not active.
· Join the connection cable with your power supply cable, according to the
connection plan shown below.
· We recommend a cross-sectional area of 0.25 mm² for the power supply
cable.
Warning! A false connection of cable can lead to destruction of unit's
electronics section
Version “O” Connection plan
Feed voltage receiver
Feed current receiver
Signal amplitude High
Signal amplitude Low
Reverse voltage Sender
Feed current Sender
Output dissipation (power)
4.5 ... 16 V
typ. 7 mA
approx. oper. voltage
0.2 V
3.0 V max.
30 mA ... 50 mA
2.5 mW max.
Version “K”
Connection plan Ub Rv
Feed voltage
Feed current
Signal amplitude
High
Signal amplitude Low
Output dissipation
see column Ub
40 ... 50 mA
approx. oper.
voltage
max. 0.2 V
2.5 mW max.
Yel low
White
Green
5 V
8 V
12 V
15 V
220W/ 0.25 W
430W/ 0.25 W
680W/ 0.25 W
910W/ 0.25 W
Version “F” Connection plan Ub Rv
Feed voltage see column Ub 8 V ...
Feed current 40 ... 50 mA 12 V
180 W/ 0.25 W
Signal amplitude High ca. 8 V 15 V
270 W/ 0.25 W
Signal amplitude Low max. 0.2 V 24 V
680 W/ 0.25 W
Output dissipation 2.5 mW max.
Model: DPL-FS... Connection plan
Feed voltage 16 ... 28 V DC
Feed current 25 ... 30 mA
Signal amplitude High Ub - 0.8 V
Signal amplitude Low max. 0.5 V
Output dissipation 2.5 mW max.
receiver
T
r
a
n
s
m
i
t
t
e
r
C
o
n
t
r
o
l
l
e
r
White
Green
Brown
16-28 VDC
Signal
OV
· After making connections of feed voltage and signal output, the unit is ready
for operation.
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9. Commissioning
· Please pay attention to the technical data of the flow meter.
· Pick a frequency value of flow meter from the following table:
Model Meas.
range
Water
(l/min)
approx.
Pressure-loss
at max. value
(bar)
approx.
Frequency at
max. value
(Hz)
DPL-005
DPL-018
DPL-060
DPL-120
DPL-250
0.025-0.5
0.05 -1.8
0.2-6
0.4-12
1-25
0.77
0.77
0.70
1.0
1.3
272
471
528
265
399
· Adjust your evaluation electronics to the pulse-rate indicated above. For
devices with frequency divider electronics, pulse-rate must by divided by the
factor indicated on the cable tag.
· In order to avoid pressure peaks, the flow medium should flow slowly into the
device.
Frequency Divider 2 4 8
Warning! Pressure peaks generated by sudden flow, caused by single
solenoid valves, ball valves or the like, can lead to the destruction of the
device (water hammer!). In the operating condition, it is to be made certain
that the sensor is constantly filled with the medium.
Note! Larger bubbles in the measuring chamber can lead to measurement
errors or destruction of bearings.
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10. Maintenance
In case, the medium to be measured is not contaminated, the unit DPL is
maintenance-free. In order to avoid problems, we recommend installation of a
filter such as Magnet-filter, Model MF-R.
Should the cleaning of a device be deemed necessary, it can be done easily by
removing housing cover and making the interior of housing accessible.
Maintenance/repair work on device's electronics may only be carried out by the
supplier, since otherwise, the warranty shall expire.
11. Technical Data
11.1. General
Max. oper. pressure: 10 bar
Temperature: - 40°C ... + 70°C
Linearity: ± 1 %
Protection Cat.: IP 65
11.2. Materials
Housing: Polypropylene
Vane: Polypropylene
Axle/Bearing: Sapphire
Vane inlet: Polysulfone
Sealing: Perbunane,
Option: Viton, EPDM
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12. Dimensions
G 1/2
G 1/2
SW 24
8
11
1313
75
32
Cabel 4,5
Æ
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13. Declaration of Conformance
We, KOBOLD-Messring GmbH, Hofheim-Ts, Germany, declare under our sole
responsibility that the product:
Rotating-vane Flow Meter DPL-FS...*
to which this declaration relates is in conformity with the standards noted below:
EN 50082-2 Electromagnetic Compatibility - Generic immunity
standard (edition 2/1996)
a) Electromagnetic compatibility, Electrostatic discharge
immunity test (EN 61000-4-2, ESD, Level B)
b) Electromagnetic compatibility, Electrical fast
transient/burstimmunity test (EN 61000-4-4, BURST, Level B)
Also the following EWG guidlines are fulfilled:
89/336/EWG
Signed: date: 19.10.00
H. Peters M. Wenzel
* The models DPL-O, DPL-K and DPL-F have no CE-conformity sign.
(OEM versions)
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