Kobold KDF-2 Series User manual

Operating Instructions
for
Flow Meter / Monitor
for very Low Flows
Model: KDF-2../KDG-2...

KDF-2/KDG-2
page 2 KDF-2/KDG-2 K02/0112
1. Contents
1. Contents........................................................................................................2
2. Note ..............................................................................................................3
3. Instrument Inspection....................................................................................3
4. Regulation Use..............................................................................................4
5. Operating Principle........................................................................................4
6. Installation.....................................................................................................5
7. Commissioning..............................................................................................5
8. Limit Switches ...............................................................................................6
9. Electrical Connection ....................................................................................7
10. Maintenance .................................................................................................8
11. Technical Information....................................................................................9
12. Pressure losses...........................................................................................10
13. Order Codes ...............................................................................................10
14. Recommended Spare Parts........................................................................11
15. Dimensions .................................................................................................12
16. Declaration of Conformance .......................................................................13
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

KDF/KDG
KDF-2/KDG-2 K02/0112 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 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 EWG-machine guidelines.
as per PED 97/23/EG
In acc. with Article 3 Paragraph (3), "Sound Engineering Practice", of the
PED 97/23/EC no CE mark.
Diagram 6, Pipe, Group 1 dangerous fluids
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.
Scope of delivery:
The standard delivery includes:
•Flow meter / Monitor model: KDF-2…/KDG-2…
•Operating Instructions

KDF-2/KDG-2
page 4 KDF-2/KDG-2 K02/0112
4. Regulation Use
The model KDF serve to measure and monitor liquid flow, models KDG serve to
measure and monitor gas flow.
Only clean, low viscosity and homogeneous liquids, which are compatible with
the materials of construction, should be measured. Dirt particles may block the
float and thus cause erroneous signals and measurements.
Standard Material Combinations
Material combination
stainless steel
Measuring cone Borosilicate glass
Float stainless steel 1.4401
Float stop Hostaflon ET
Valve stem st. steel 1.4404
Valve seat PTFE 25% C (carbon fibre)
Gaskets FPM (standard)
FFKM (option).
Fitting
(head and base part)
st. steel 1.4404
Hose nozzle Polyamid
5. Operating Principle
The flow meters and switches for very low flows model KDF and KDG for liquids
and air operate on the suspended float principle: that is, the installation position is
vertical and the direction of flow is from bottom to top.
The instruments have been designed as simple and thus economical measuring
systems. The float is a ball, whereby the indication point is the upper edge of the
ball. A needle valve is fitted as standard.

KDF/KDG
KDF-2/KDG-2 K02/0112 page 5
6. Installation
Installation in the Pipeline
•The rotameter flow meter must be installed vertically (float measuring
system). Direction of flow from bottom to top.
•Clean the pipeline to the device, before connecting, by blowing out or rinsing.
•The connection is made with unions suited for the model. The pipes should be
connected to the ports of the measuring instrument, centric and as free of
stress as possible. The piping should be supported if necessary, to prevent the
transmission of vibrations to the measuring instrument.
Panel Mounting
•The panel cut-out should be prepared for panel mounting according to the
drawing (see section 15. Dimensions).
•Installation in the control panel: Both screws (1) on the front panel of the
measuring instrument are loosened a bit, the device is inserted in the panel
cut-out from the front, aligned and fixed with both screws (1).
7. Commissioning
•The actual operating pressure and measuring temperature of the plant should
not exceed the specified maximum values.
•Ensure material compatibility.
•Close needle valve on flow meter.
•Open shutoff valve upstream and downstream of measuring instrument.
•The pipeline should be carefully vented for liquids.
•Allow the operating pressure to increase slowly for gases. Avoid sudden
bursts (danger of glass breaking).
•Open needle valve and set the desired flow rate.
•Should the operating parameters deviate from the calibration data (flow range,
measured medium, pressure, density and temperature), the measuring
instrument can be adapted to the actual conditions. Use the conversion of the
flow rate according to VDI/VDE guideline 3513.

KDF-2/KDG-2
page 6 KDF-2/KDG-2 K02/0112
8. Limit Switches
To signal particular flow rates the low volume flow meters can be fitted with limit
switches that initiate an electrical signal when the set value is reached. The float
in the flow meter must be made of stainless steel. One signal transmitter is
required for each limit value.
The following limit switch models are available:
•Bistable annular initiators RC 10-14-N3 or N7R29A (up to KDF-2220 and KDG-
2224) and RC 15-14-N3 or N7R31A (from KDF-2225 and KDG-2229) .
Bistable limit switches detect the direction of movement of the float when it
passes by. The device can thus determine whether the float is above or below
the annular initiator block. Bistable limit switches are delivered with connection
box and built-in filter EMC-Y 38132 or EMC-Y38133.
•Monostable annular initiators RC 10-14-NO or N7R28A (up to KDF-2220 and
KDG-2224 and RC 15-14-NO or N7R30A (from KDF-2225 and KDG-2229) .
The annular initiator is actuated when the metal float passes the annular
initiator (wiper effect). No EMV filter is required for monostable limit monitors.
A transistor relay should be connected on the load side for each switching
circuit for operation.
Adjusting the limit switch type RC10/15-14-N0/N3
The limit switch (ring form) can be
adjusted alongside of the measuring
tube. It is fixed via a screw (1) at a
guiding rod (3).
Adjusting of the contact:
-unscrew the fixing screw (1)
-move contact (2) to bottom or top
-lock fixing screw (1)
ATTENTION: (limited switching range)
For the measuring tubes / glasses N° 40,41,61,64 and 68 the contact
cannot be moved to the max. flow range.

KDF/KDG
KDF-2/KDG-2 K02/0112 page 7
Adjusting the limit switch type N7R**A
•The limit switch is adjusted for the
desired flow rate by moving it. The
limit switch (2) is fixed to the back
track (3) of the measuring instrument
with the two retaining screws (1).
•Please note that limit switches for
model numbers KDF-2239 to KDF-2241 and KDG-2257 to KDG-2268 can only
be used to approximately 50% of the max. measuring range because of the
cone-shaped measuring glasses.
•Replace plexiglass protective cover after adjustment.
9. Electrical Connection
Adjusting the limit switch
•Make sure that the electrical supply lines are not active.
•Connect the supply line to the transistor relay according to the wiring diagram.
The wiring diagram shown here is only valid for the transistor relay
recommended by us. We cannot provide any details here for connecting the
limit switch to a transistor relay from a different manufacturer.
•If the contact has not been adjusted yet, do so at this stage
Connect limit value controller (+) brown cable (-) blue cable with transistor relay
for devices without terminal box.
3- 1+
1 - +
Transistor relay
Typ KFD2…/KFA6…
Connection box

KDF-2/KDG-2
page 8 KDF-2/KDG-2 K02/0112
Wiring diagram for 2 limit transducers
When using two switch contacts the distance between both contacts
must be minimum 16 mm.
10. Maintenance
Replacing the Measuring Cone’
•Close valve upstream and downstream of device!
•Devices, fitted in a control panel, must be removed. Close device valve!
Attention! The measuring instrument must be pressure free and free
from aggressive and caustic media !
If necessary, rinse device thoroughly and neutralise before removal.
•Push plexiglass protective cover upwards and remove to the front.
•Rotate spanner in base of device counter-clockwise to loosen the measuring
glass; then remove the glass.
•Install in reverse order. To avoid breaking the glass in the measuring cone
when clamping, the measuring glass must be installed centric between the
gaskets.
Typ: RC 10/15-14 NO/N3
PTB 99 ATEX 2128 X
II 2G Ex ia IIC T6
Hazardous area
Inductive contacts
Typ: N7R**A
BVS 08 ATEX E026, IECEx BVS 09.0016,
II 1G Ga Ex ia IIC T6
,
II 1D Ex iaD 20 T125°C

KDF/KDG
KDF-2/KDG-2 K02/0112 page 9
11. Technical Information
Installation position: vertical, flow from bottom
Accuracy: ± 2,5 % qG50 (acc. VDI/VDE 3513, Bl.2)
± 3 % v. ME (inlet pressure regulator)
± 5 % v. ME (outlet pressure regulator)
(10-100% of range)
Max. pressure: PN 16
Medium temperature: -20 °C…+100 °C
-20 °C …+70 °C (with contact)
Ambient temperature: -20 °C…+100 °C
-20 °C …+70 °C (with contact)
Connection: ¼ NPT, G1/4 female
hose nozzle for 8 mm hose
Weight: approx. 0.4 kg
approx. 0,8 kg with pressure regulator
Materials (in contact with the media)
Fitting: stainless steel 1.4404
Measuring tube: borosilicate glass
Float stop: Hostaflon ET
Float: stainless steel 1.4401
Gasket: FPM, option FFKM
Valve stem: stainless steel 1.4404
Valve seat: PTFE 25% C (carbon fibre)
Hose nozzle (option): Polyamid

KDF-2/KDG-2
page 10 KDF-2/KDG-2 K02/0112
12. Pressure losses
Range
water
L/h
Order
No.
Valve seat
(mm)
Pressure
drop
(mbar)
Range
air**
LN/h
Order
No.
Valve seat
(mm)
Pressure
drop
(mbar)
0,25 –2,5 KDF-2217... 1,2 10 0,5 – 5 KDF-2207... 1,2 15
0,5 – 5 KDF-2220... 1,2 20 0,8 - 8 KDF-2209... 1,2 15
1,2 – 12 KDF-2225... 2,8 10 1,6 – 16 KDF-2213.. 1,2 15
2,5 – 25 KDF-2228... 2,8 20 4 – 40 KDF-2221... 1,2 20
4 – 40 KDF-2230... 2,8 30 6 – 60 KDF-2224... 1,2 25
6 - 60 KDF-2235.. 2,8 80 10 –100 KDF-2228... 2,8 15
10 –100 KDF-2239... 2,8 125 25 – 250 KDF-2232... 2,8 15
12 - 120 KDF-2240... 3,4 200 50 - 500 KDF-2237... 2,8 15
16 - 160 KDF-2241... 3,4 200 80 - 800 KDF-2242... 2,8 20
others KDF-22YY... on request on request 100 – 1000 KDF-2246... 2,8 25*
180 – 1800 KDF-2251.. 2,8 80
240 – 2400 KDF-2257... 2,8 125
300 – 3000 KDF-2261... 2,8 150
400 – 4000 KDF-2264... 3,4 200
500 – 5000 KDF-2268... 3,4 200
others KDF-22YY... on request on request
13. Order Codes
Liquids. Order Details (Example: KDF-2217 NV 0 M10)
Measuring
range
water
L/h
Order no.
stainless
steel
Connection*** Gasket
option
Panel
installatio
n kit
Contact option Miscellaneous
options
0,25 –2,5 KDF-2217...
N= ¼ NPT
R= G ¼
W= hose
connector
angular, 90°
S= hose
connector
straight
Y= special
V= FPM
T= FFKM
0= without
S= with
00 = without contact 0= without
E= pressure regulator
for variable inlet
pressure, FPM-
membrane
A= pressure regulator
for variable outlet
pressure, FPM-
membrane
F= pressure regulator
for variable inlet
pressure, FFKM-
membrane
B= pressure regulator
for variable outlet
pressure, FFKM-
membrane
Y= e.g. without
valve.
Please specify in
writing.
Up to model KDF-2220
with 2 m cable
M1=1 monostable contact
M2=2 monostable contacts
N1=1 bistable contact
N1=2 bistable contact
with junction box
A1=1 monostable contact
A2=2 monostable contacts
B1=1 bistable contact
B2=2 bistable contacts
0,5 – 5 KDF-2220...
1,2 – 12 KDF-2225...
2,5 – 25 KDF-2228...
4 – 40 KDF-2230...
6 – 60 KDF-2235... KDF-2225…KDF-2241
with 2m cable
M3=1 monostable contact
M4=2 monostable contacts
N3=1 bistable contact
N4=2 bistable contact
with junction box
A3=1 monostable contact
A4=2 monostable contacts
B3=1 bistable contact
B4=2 bistable contacts
10 –100 KDF-2239...*
12 - 120 KDF-2240...*
16 - 160 KDF-2241...*
other
liquids KDF-12YY...