Kobold DWU 5 Series User manual

Operating Instructions
for
Paddle Bellows Flow Monitor
Model: DWU / DWN

DWU/DWN
Page 2 DWU/ DWN K05/0822
1. Contents
1.Contents ........................................................................................................ 2
2.Note .............................................................................................................. 3
3.Instrument Inspection .................................................................................... 3
4.Regulated Use .............................................................................................. 4
5.Operating Principle ........................................................................................ 5
6.Mechanical Connection ................................................................................. 6
6.1Before installation ................................................................................ 6
6.2Mounting methods ............................................................................... 7
7.Electrical Connection .................................................................................... 8
8.Limit Switches ............................................................................................... 8
9.Maintenance ................................................................................................. 9
10.Recommended Spare Parts .......................................................................... 9
11.Technical Information .................................................................................. 10
11.1Calibration dates ................................................................................ 10
12.Order Codes ............................................................................................... 11
13.Dimensions ................................................................................................. 13
14.Disposal ...................................................................................................... 14
15.EC Declaration of Conformance ................................................................. 15
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

DWU / DWN
DWU / DWN K05/0822 Page 3
2. Note
Please read these operating instructions carefully before commissioning the unit
for operation, and follow the instructions precisely as described.
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 operated, maintained and serviced by persons familiar
with these operating instructions and with currently recommended safety
regulations.
When used in machines, the measuring unit should only be placed in operation if
the machine in use complies with the EC-machinery guide lines.
PED 2014/68/EU for DWU/DWN-1 and DWU/DWN-2
In acc. with Article 4 Paragraph (3), "Sound Engineering Practice", of the
PED 2014/68/EU no CE mark.
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.
The devices are delivered ready for production and have to be protected against
external damages. The movement is not locked.
Scope of delivery:
The standard delivery includes:
 Paddle Bellows Flow Monitor for Liquids model: DWU/DWN

DWU/DWN
Page 4 DWU/ DWN K05/0822
4. Regulated Use
Model DWU and DWN instruments are used for monitoring and measuring liquid
flows. Only those liquids, that are compatible with the materials of construction,
may be measured or monitored. Large measuring errors will result if used with
high viscosity media. The instruments are quite insensitive to dirt.
The instruments are available as follows:
 model DWU: Includes indicator for displaying the actual flow, adjustable
micro switch to monitor the flow.
 model DWN: Adjustable micro-switch to monitor the flow (no indicator).
Material combinations
Material-
Combination
DWU-...5
DWN-...5
DWU-...6
DWN-...6
DWU-...7
DWN-...7
device part
T-piece brass stainless steel PVC
connecting thread brass stainless steel PVC
connecting flange steel zinc-plated stainless steel PVC
weld-on flange steel
painted stainless steel boring pipe box PVC
paddle system brass stainless steel stainless steel
bellows stainless steel stainless steel stainless steel
seals FPM FPM FPM
housing meas.
section stainless steel stainless steel stainless steel
covering hood polycarbonate polycarbonate polycarbonate
tmax* 100 °C 100 °C 20 °C (60 °C)
pmax* 16 bar 16 bar 16 bar (2 bar)
*higher on request

DWU / DWN
DWU / DWN K05/0822 Page 5
5. Operating Principle
The flow meter/monitor works on the principle of dynamic pressure. The flow
medium pushes against a pressure plate (1), which causes the system to swing
against a tensioned spring (2).
A metal bellows (3) seals the indicator and switch assembly from the flowing
liquid.
The connection between the pressure plate (1) and the electrical micro switch (6)
is made by a lever arm, which provides a positive link.
The micro switch (6) opens or closes an electrical circuit whenever the pre-
selected low or high flow switching points are passed. Thus the change in flow is
clearly signalled locally by the switching point pilot lamp (illuminates below set-
point); while, at the same time the switch contacts change state (SPDT). The
DWU also displays the rate of flow by a pointer (4) on an indicating scale (5).

DWU/DWN
Page 6 DWU/ DWN K05/0822
6. Mechanical Connection
6.1 Before installation
 Make sure that the actual flow matches the switching range of the device
(please see name plate).
 Be sure that the operating pressure corresponds to the reference pressure
specified when placing order.
 Make sure that the maximum allowable operating temperature of the
instruments is not exceeded.
 Remove all transport packaging and ascertain that no packing material is left in
the instrument.
 The instrument must be oriented in agreement with the positioning symbol on
the name plate. This positioning is with reference to the pipe run. Installation in
a position different from that given on the identification tag will result in
measuring errors.
 The corresponding flow direction is shown on the instrument. If flow is in the
opposite direction, the instrument does cease to function.
Mounting position
To avoid damages at the measuring system it is especially important to have the
biggest possible distance from magnet valves and ball valves. If it is not possible
to have a big distance, the valves have to be installed after the instruments. To
avoid pressure shocks it is very important to open the valves slowly.
Straight runs
When mounting the device, the following inlet and outlet straight run requirements
must be met:
 Straight pipe run upstream of instrument :
a distance equal to10 x pipe diameter
 Straight pipe run downstream of instrument :
a distance equal to 5 x pipe diameter
(d= bore diameter of pipe)

DWU / DWN
DWU / DWN K05/0822 Page 7
6.2 Mounting methods
The instruments can be supplied with the following connection designs:
Threaded pipe connection (DWU-1, DWN-1)
The pipe is connected directly to the flow monitor. Use only PTFE sealing tape to
seal the screw fitting. (do not use hemp).
Flange mounting (DWU-2, DWN-2)
With flange mounting a flat gasket should be used between the instrument and
the customer’s flange. The gasket is to be supplied by the customer.
Weld-on flange (DWU-3, DWN-3)
The complete flange with screws and sealing is delivered with the instrument.
The distance 60mm has to be kept exactly, because this directly affects the
calibration of the instrument. The pipe bore must be free from burrs, and all
traces of welding material must be removed. The screw whole have to be
staggered 90° to the pipe axis. Use the enclosed sealing.
Attention! When mounting the device pay attention to the indicated
flow direction. All pipes have to be free from pollution.
If possible, check that the pipe connection thread is fully sealed immediately after
mechanical installation.

DWU/DWN
Page 8 DWU/ DWN K05/0822
7. Electrical Connection
Before proceeding, be sure that the electrical supply lines are de-energized.
Standard contact
 Removing the enclosure to gain access to the four polar
connector block.
 Additionally to the micro-switch a control lamp is
installed. This lamp is for optical control of switch status
of the micro-switch.
 The current which is necessary for the lamp is indicated
at the label. The max. switching performance is up to
230 VAC / 10 A.
 Please connect the device to ground with help of the
screw near cable entry.
8. Limit Switches
The instruments are delivered with a SPDT micro-switch.
Adjustment of switch points
 model DWU: The adjustment of the switch point is made with the small
scale on back of the instrument. The actual flow is indicated at
the front side of the unit.
 model DWN: The adjustment of the switch points is made with the small
scale on the faceplate of the unit.

DWU / DWN
DWU / DWN K05/0822 Page 9
9. Maintenance
Flow indicators and -monitors are virtually maintenance-free.
In case of malfunction, check the pipe system for calcification or other
obstruction. To do this, all instruments have to be removed completely from the
pipe system; except type DWU, (up to a T-piece diameter of 1") which can be
separated from the pipe by removing the four screws on the special flange, and
turning the instrument by 90 ° to remove it.
Caution! For cleaning do not use sharp-edged steel tools. Damaged
instruments can only be repaired in our factory, because they have
to be re-calibrated.
Loosening lacquer-protected screws will invalidate the guarantee.
10. Recommended Spare Parts
No spare parts are needed.
To reorder new units, only the serial no on the instrument is to be given.

DWU/DWN
Page 10 DWU/ DWN K05/0822
11. Technical Information
Flow ratio: threaded connection: max. 1 : 5
mounting flange: max.1 : 4
Repeat accuracy: up to 20 l/min.: ±5 %
21- 200 l/min.: ±4 %
201 and more l/min.: ±3 %
(based on calibration position
and medium at 20 °C)
Pressure loss: 0.1 - 0.3 bar
(average pressure loss, value upon request)
Switching hysteresis: up to 2 bar 10 %
> 2 bar depending on pressure
Ambient temperature: max. 70 °C
Electrical switching: 250 V / 10 A (Standard)
Pilot lamp: 230 VAC, 110 VAC or 24 VDC
Protection type: IP 55 (IP 65 upon request)
11.1 Calibration dates
Calibration dates, type of device and serial number are indicated at the label.
Changes of medium, pressure and position of mounting will influence accuracy.

DWU / DWN
DWU / DWN K05/0822 Page 11
12. Order Codes
Flow monitor model DWU-1… with male thread connection
Flow range
(L/min)
Material combination
(bellows/T-piece)
Connection
male thread
Pilot
lamp
Direction of flow Location of
indicator
Option
min.
wate
r
max.
wate
r
st. steel/
brass
st. steel/
st. steel
st. steel/
PVC
1 25 DWU-15.. DWU-16.. DWU-17.. R10= G 3/8
N10= 3/8 NPT
0=230 VAC
1=110 VAC
3=24 VDC
X= without
pilot
lamp
R= from right to left
L= from left to right T= above lead
0= without
D= with
damping
2= twin contact
1 55 DWU-15.. DWU-16.. DWU-17.. R15= G 1/2
N15= 1/2 NPT
T= from top to
bottom
B= from bottom to
top
R= right of lead
L= left of lead
5 100 DWU-15.. DWU-16.. DWU-17.. R20= G 3/4
N20= 3/4 NPT
6 150 DWU-15.. DWU-16.. DWU-17.. R25= G 1
N25= 1 NPT
10 250 DWU-15.. DWU-16.. DWU-17.. R32= G 1 1/4
N32= 1 1/4 NPT
20 400 DWU-15.. DWU-16.. DWU-17.. R40= G 1 1/2
N40= 1 1/2 NPT
50 600 DWU-15.. DWU-16.. DWU-17.. R50= G 2
N50= 2 NPT
Flow monitor model DWU-2... with flange connection
Flow range
(L/min)
Material combination
(bellows/T-piece)
Connection
flange
Pilot
lamp
Direction of flow Location of
indicator
Option
min.
wate
r
max.
wate
r
st. steel/
brass
st. steel/
st. steel
st. steel/
PVC
1 25 DWU-25.. DWU-26.. - F10= DN 10
A
10= 3/8” ANSI
0=230 VAC
1=110 VAC
3=24 VDC
X= without
pilot lamp
R= from right to left
L= from left to right T= above lead
0= without
D= with
damping
2= twin contact
1 55 DWU-25.. DWU-26.. - F15= DN 15
A
15= 1/2“ ANSI
T= from top to
bottom
B= from bottom to
top
R= right of lead
L= left of lead
5 100 DWU-25.. DWU-26.. - F20= DN 20
A
20= 3/4“ ANSI
6 150 DWU-25.. DWU-26.. DWU-27.. F25= DN 25
A
25= 1” ANSI
10 250 DWU-25.. DWU-26.. DWU-27.. F32= DN 32
A
32= 1 1/4“ ANSI
20 400 DWU-25.. DWU-26.. DWU-27.. F40= DN 40
A
40= 1 1/2“ ANSI
50 600 DWU-25.. DWU-26.. DWU-27.. F50= DN 50
A
50= 2“ ANSI
Flow monitor model DWU-35…/DWU-36… with weld-on flange / DWU-37… with boring pipe box
Flow range
(m³/h)
Material combination
(bellows/T
-
piece)
For pipe-
cross-section
Pilot lamp Direction of flow Location of
indicator
Option
min.
water
max.
water
st. steel/
steel
st. steel/
st. steel
st. steel/
PVC
1,2 24 DWU-35… DWU-36… DWU-37… W40= DN 40
0=230 VAC
1=110 VAC
3=24 VDC
X= without
pilot
lamp
R= from right to left
L= from left to right T= above lead
0= without
D= with
damping
2= twin contact
3,0 36 DWU-35… DWU-36… DWU-37… W50= DN 50
4,8 60 DWU-35… DWU-36… DWU-37… W65= DN 65
T= from top to
bottom
B= from bottom to
top
R= right of lead
L= left of lead
7,2 90 DWU-35… DWU-36… DWU-37… W80= DN 80
12 144 DWU-35… DWU-36… DWU-37… W1H= DN 100
18 225 DWU-35… DWU-36… DWU-37… W1Z= DN 125
24 330 DWU-35… DWU-36… DWU-37… W1F= DN 150
42 600 DWU-35… DWU-36… DWU-37… W2H= DN 200
72 900 DWU-35… DWU-36… - W2F= DN 250
102 1200 DWU-35… DWU-36… - W3H= DN 300
150 1800 DWU-35… DWU-36… - W3F= DN 350
180 2400 DWU-35… DWU-36… - W4H= DN 400
300 3600 DWU-35… DWU-36… - W5H= DN 500

DWU/DWN
Page 12 DWU/ DWN K05/0822
Flow monitor model DWN-1... with male thread connection
Flow range
(L/min)
Material combination
(bellows / T
-
piece)
Connection
male thread
Pilot
lamp
Direction of flow Location of
indicator
Option
min.
wate
r
max.
wate
r
st. steel/
brass
st. steel/
st. steel
st. steel/
PVC
1 25 DWN-15.. DWN-16.. DWN-17... R10= G 3/8
N10= 3/8 NPT
0=230 VAC
1=110 VAC
3=24 VDC
X= without
pilot lamp
R= from right to left
L= from left to right T= above lead
0= without
D= with damping
2= twin contact
1 55 DWN-15.. DWN-16.. DWN-17... R15= G 1/2
N15= 1/2 NPT
T= from top to
bottom
B= from bottom to
top
R= right of lead
L= left of lead
5 100 DWN-15.. DWN-16.. DWN-17... R20= G 3/4
N20= 3/4 NPT
6 150 DWN-15.. DWN-16.. DWN-17... R25= G 1
N25= 1 NPT
10 250 DWN-15.. DWN-16.. DWN-17... R32= G 1 1/4
N32= 1 1/4 NPT
20 400 DWN-15.. DWN-16.. DWN-17... R40= G 1 1/2
N40= 1 1/2 NPT
50 600 DWN-15.. DWN-16.. DWN-17... R50= G 2
N50= 2 NPT
Flow monitor model DWN-2... with flange connection
Flow range
(L/min)
Material combination
(bellows / T
-
piece)
Connection
flange
Pilot
lamp
Direction of flow Location of
indicator
Option
min.
wate
r
max.
wate
r
st. steel/
brass
st. steel/
st. steel
st. steel/
PVC
1 25 DWN-25.. DWN-26.. - F10= DN 10
A10= 3/8” ANSI
0=230 VAC
1=110 VAC
3=24 VDC
X= without
pilot lamp
R= from right to
left
L= from left to
right
T= above lead
0= without
D= with damping
2= twin contact
1 55 DWN-25.. DWN-26.. - F15= DN 15
A
15= 1/2“ ANSI
T= from top to
bottom
B= from bottom to
top
R= right of lead
L= left of lead
5 100 DWN-25.. DWN-26.. - F20= DN 20
A
20= 3/4“ ANSI
6 150 DWN-25.. DWN-26.. DWU-27.. F25= DN 25
A
25= 1” ANSI
10 250 DWN-25.. DWN-26.. DWU-27.. F32= DN 32
A
32= 1 1/4“ ANSI
20 400 DWN-25.. DWN-26.. DWU-27.. F40= DN 40
A
40= 1 1/2“ ANSI
50 600 DWN-25.. DWN-26.. DWU-27.. F50= DN 50
A
50= 2“ ANSI
Flow monitor model DWN-35../DWN-36.. with weld-on flange / DWN-37.. with boring pipe box
Flow range
(m³/h)
Material combination
(bellows
/
connection piece)
For pipe cross-
section
Pilot
lamp
Direction of flow Location of
indicator
Option
min.
water
max.
water
st. steel/
steel
st. steel/
st. steel
st. steel/
PVC
1,2 24 DWN-35… DWN-36… DWN-37… W40= DN 40
0=230 VAC
1=110 VAC
3=24 VDC
X= without
pilot
lamp
R= from right to
left
L= from left to
right
T= above lead
0= without
D= with damping
2= twin contact
3,0 36 DWN-35… DWN-36… DWN-37… W50= DN 50
4,8 60 DWN-35… DWN-36… DWN-37… W65= DN 65
T= from top to
bottom
B= from bottom to
top
R= right of lead
L= left of lead
7,2 90 DWN-35… DWN-36… DWN-37… W80= DN 80
12 144 DWN-35… DWN-36… DWN-37… W1H= DN 100
18 225 DWN-35… DWN-36… DWN-37… W1Z= DN 125
24 330 DWN-35… DWN-36… DWN-37… W1F= DN 150
42 600 DWN-35… DWN-36… DWN-37… W2H= DN 200
72 900 DWN-35… DWN-36… - W2F= DN 250
102 1200 DWN-35… DWN-36… - W3H= DN 300
150 1800 DWN-35… DWN-36… - W3F= DN 350
180 2400 DWN-35… DWN-36… - W4H= DN 400
300 3600 DWN-35… DWN-36… - W5H= DN 500

DWU / DWN
DWU / DWN K05/0822 Page 13
13. Dimensions
with thread connection
RH
(
mm
)
L
(
mm
)
3/8 145 + 1 135 + 1
½ 145 + 1 135 + 1
¾ 145 + 1 135 + 1
1 145 + 1 135 + 1
1 ¼ 150 + 2 170 + 2
1 ½ 155 + 2 170 + 2
2 160 + 2 170 + 2
We kindly ask you to provide us with a
separate inquiry for the exact dimensions of
the material combination 7 (PVC).
with flange connection
We kindly ask you to provide us with a
separate inquiry for the exact dimensions
of the material combination 7 (PVC).
with weld-on flange
We kindly ask you to provide
us with a separate inquiry for
the exact dimensions of the
material combination 7 (PVC).
DN D
(
mm
)
K
(
mm
)
H
(
mm
)
L
(
mm
)
10 90 60 145 + 1 155 + 2
15 95 65 145 + 1 155 + 2
20 105 75 145 + 1 160 + 2
25 115 85 145 + 1 160 + 2
32 140 100 150 + 2 190 + 2
40 150 110 155 + 2 190 + 2
50 165 125 160 + 2 190 + 2
100 70
L
H
70
R
L
7
0
100
H
70
100 70
welded
existing piping

45x2,5

115
70
60*
15560
*less pipe wall
thickness
DN 25 DIN flange

DWU/DWN
Page 14 DWU/ DWN K05/0822
14. Disposal
Note!
 Avoid environmental damage caused by media-contaminated parts
 Dispose of the device and packaging in an environmentally friendly
manner
 Comply with applicable national and international disposal regulations and
environmental regulations.
Batteries
Batteries containing pollutants are marked with a sign consisting of a crossed-out
garbage can and the chemical symbol (Cd, Hg, Li or Pb) of the heavy metal that
is decisive for the classification as containing pollutants:
Cd1 Hg2 Pb3 Li4
1. „Cd" stands for cadmium
2. „Hg" stands for mercury
3. „Pb" stands for lead
4. „Li" stands for lithium
Electrical and electronic equipment

DWU / DWN
DWU / DWN K05/0822 Page 15
15. EC Declaration of Conformance
We, Kobold-Messring GmbH, Hofheim-Ts., Germany, declare under our sole
responsibility that the product:
Paddle Bellows Flow Monitor model DWU / DWN -...
to which this declaration relates is in conformity with the standards noted below:
EN 61010-1:2010 Safety requirements for electrical equipment for
measurement, control and laboratory use - Part 1: General requirements
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 EMC Directive
2011/65/EU RoHS (category 9)
Hofheim, 27 Febr. 2019
H. Peters M. Wenzel
General Manager Proxy Holder