Kobold VKG User manual

Operating Instruction
for
Viscosity Compensated
Flow Meter and Monitor
Model: VKG

VKG
Page 2 VKG K09/0322
1. Contents
1.Contents ........................................................................................................ 2
2.Note .............................................................................................................. 3
3.Instrument Inspection .................................................................................... 3
4.Regulated Use .............................................................................................. 3
5.Operating Principle ........................................................................................ 4
6.Mechanical Connection ................................................................................. 5
7.Electrical Connection .................................................................................... 6
8.Use in hazardous area .................................................................................. 7
8.1.Statement an apparatus not containing an own potential ignition
source .................................................................................................. 7
8.2.ATEX reed contact 41R57** ............................................................... 9
9.Commissioning............................................................................................ 15
10.Maintenance ............................................................................................... 16
11.Technical Information .................................................................................. 16
12.Ordering Codes ........................................................................................... 18
13.Recommended Spare Parts ........................................................................ 19
14.Dimensions ................................................................................................. 20
15.EU Declaration of Conformance (VKG) ....................................................... 22
16.UK Declaration of Conformity (VKG) ........................................................... 23
17.EU Declaration of Conformance (Reed contact 41R57**) ........................... 24
18.Statement of conformity reed contact 41R57** ........................................... 25
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

VKG
VKG K09/0322 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 8, Pipe, Group 1 dangerous fluids
3. Instrument Inspection
These devices are checked before dispatch and sent away in perfect condition.
Should the damage to a device be visible, we recommend a thorough inspection
of the delivery packing. In case of damage, please inform your parcel service/
forwarding agent immediately, since they are responsible for damages during
transit.
Scope of delivery:
 Viscosity Compensated Flow Meter and Monitor model: VKG
4. Regulated Use
Model VKG instruments are used for the measurement and monitoring of viscous
liquid flows (max. 760 mm2/s). Only clean and homogeneous media may be
measured, which do not affect the materials used in the instrument casing.
Large measuring errors will occur when using higher viscosity media. Large dirt
particles may lead to blocking of the float and therefore to large measurement and
signal errors.

VKG
Page 4 VKG K09/0322
Ferritic particles that deposit on the float body (with internal magnet) may also lead
to a similar effect.
The instruments are provided as follows:
Flow measurement
The actual flow may be read locally off the instrument. The top of the float indicates
directly the flow rate in litres per minute on the scale.
Limit Value Contacts (only for model VKG- 2.. and VKG-3..)
For the monitoring of the flow rate, the instruments may be fitted with one or two
adjustable limit value contacts.
Standard design: Normally open reed contacts (with increasing flow)
Special design: Changeover reed contacts
The contact is adjustable over the full measuring range.
Standard Material Combinations
Material: Brass Material: Stainless Steel
Outer casing
A
luminium, anodised
A
luminium, anodised
Spring St. Steel 301 St. Steel 301
Orifice St. Steel 301 / brass St. Steel 301
Magnet Ceramic oxide Ceramic oxide
Connections Brass St. Steel 304
Float Brass St. Steel 304
Measuring tube Borosilicate Borosilicate
O-rings NBR FPM
Tmax. 100 °C 100 °C
Pmax. 12 ba
r
12 ba
r
5. Operating Principle
A float with sharp edged orifice apertures is located within
a cylindrical glass measuring tube. When a flow occurs,
the medium lifts the float against a spring which exerts a
force downwards on the float. Each position of the float
corresponds to a particular flow throughput, which may be
read off the scale marked on the glass measuring tube.
Permanent magnets are mounted on the float which
activates reed switches positioned outside of the flow
throughput. The activation of the contacts is carried out by
means of magnetic field, i.e.: the contact is hermetically
separated from the flowing medium.

VKG
VKG K09/0322 Page 5
6. Mechanical Connection
Before installation:
 The instrument may be mounted in any position. No modifications are neces-
sary. The flow takes place in the direction of the arrow (on the label).
 Remove all transport packing and ascertain that no packing material is left in
the instrument.
 Sealing of the connection threads should be carried out with Teflon tape or
similar.
 During installation of the instrument, it must be checked that no strong forces
will be applied to the connections. We recommend fixing the inlet and outlet pipes
mechanically at approximately 50 mm from each instrument connection.
 The instrument must not be installed within an induction field.
Attention! The threaded connection of the instrument must be
tightened with a suitable size of open ended spanner. Otherwise,
the housing may be stressed which could lead to breakage of
the instrument.
 If possible, check directly after mechanical installation that the connection
thread to pipe is fully sealed (see section commissioning)
Attention! Please note that when installed in open spaces freezing
of the medium can lead to breakage of the glass tube.
 Please ascertain whether the allowable
maximum operating pressure and operating
temperature of the instruments will not be
exceeded (see table: standard material
combinations).

VKG
Page 6 VKG K09/0322
7. Electrical Connection
(Only for Models VKG-2.. and VKG-3..)
 Make sure that the supply wires are de-energized.
 Loosen the holding screw of the plug cap and remove the
cap from the plug.
 Connect the power cable to the plug cap in accordance
with the connection diagram below.
 If the contact has as yet not been adjusted, this should be
carried out at this stage (see section 9 commissioning)
 Connect the plug to the contact connections and secure it
with the holding screw (see section 9 commissioning).
Attention! Electrical values of the reed contacts may not be
exceeded even for short periods. For higher switching values we
recommend contact protection relays.
Following connection of the external equipment to the output and adjustment of the
required switch points, the external power supply to the equipment may be
switched on.
Examples for Contact Protection Measures
For capacitive and inductive loads (long cables and relays/protection) we
recommend protective switching.

VKG
VKG K09/0322 Page 7
8. Use in hazardous area
8.1. Statement an apparatus not containing an own potential
ignition source

VKG
Page 8 VKG K09/0322

VKG
VKG K09/0322 Page 9
8.2. ATEX reed contact 41R57**
ATEX N/O contact 41R57
II 3G Ex ic IIC T4 Gc
II 3 D Ex ic IIIC T125 °C Dc
-20 °C ≤Ta≤80 °C
max. 250 V
AC/DC
/1.5 A/100 W/100 VA
ATEX changeover contact 41R57U
II 3G Ex ic IIC T4 Gc
II 3 D Ex ic IIIC T125 °C Dc
-20 °C ≤Ta≤80 °C
max. 250 V
AC/DC
/1 A/30 W/60 VA
Ex-relevant excerpt of the operating instructions of the reed contact
41R57 **
1. Preambel
This excerpt of the operating instructions only represents the ex-relevant aspects.
It is copied into the original operating manual in the same or analogous form;
Textual changes are permitted, the ex-relevant statements remain.
To ensure the function and for your own safety, please read the enclosed operating
instructions carefully before you begin the installation. If you have any questions,
please contact the KOBOLD Messring GmbH, Hofheim. It applies with the original
operating instructions.
The following standard issues were considered in the evaluation of the product:
a) IEC 60079-0:2017 Ed. 7 / EN 60079-0:2018 Explosive atmospheres –
Part 0: Equipment - General requirements
b) IEC 60079-11:2011 Ed. 6 + Corr. 2012 / EN 60079-11:2012 Explosive
atmospheres - Part 11: Equipment protection by intrinsic safety "i"
2. General information on explosion protection
The reed switches work together with various KOBOLD products and serve there
for monitoring. It is available as N/O contact or changeover contact.
The electrical connection is made via a plug - only in intrinsically safe systems.
The reed switch is intended for commercial use and may only be used in
accordance with the specifications in the technical documentation of Kobold and
the information on the nameplate. It is only operated together with certified products
via an intrinsically safe circuit. They comply with the valid standards and
regulations.
The installation regulations (e.g. EN 60079-14) for systems in potentially explosive
atmospheres must be observed.
Further important details can be found in the corresponding EC-type examination
certificate.

VKG
Page 10 VKG K09/0322
Permitted use
• The intrinsically safe reed switch can be used as follows:
• In Zone 2 (Gas-Ex, EPL Gc) in explosion groups IIA, IIB and IIC
• In Zone 22 (Dust-Ex, EPL Dc) in explosion groups IIIA, IIIB and IIIC
• The requirements for simple electrical equipment for use in intrinsically safe
circuits in zones 1/21 are fulfilled.
• The qualification regarding the surface temperature is T4. For all gases, vapors,
mists with an ignition temperature> 135 ° C the equipment is not an ignition
source.
• In the dust Ex area, 125 ° C is the reference temperature for further
consideration regarding the safety distance from the smoldering temperature.
• The ambient temperature range is -20 ° C ≤ Ta ≤ 80 ° C.
2.1. Electrical characteristics for Ex i
Electrical data:
• Rated voltage up to 45 volt AC / DC
• Rated current up to 2 A
• UiIC ≤ 30 V AC / DC, IiIIC ≤ 250 mA
• UiIIB ≤ 45 V AC / DC, IiIB ≤ 2 A
• UiIIIC ≤ 45 V AC / DC, IiIIIC ≤ 250 mA
• Li = negligible, Ci = negligible
• Heating on the outer housing <15 K
2.2 Type code
The equipment is identified by the following type code:
Type Description Item-No. Remarks
41R57 A B T
y
pe codin
g
41R57 Contact device
A
N/O contact
(
2 wires
)
, Plu
g
with black cap
Change-over contact (3 wires), Plug with grey
cap
B 70
–
75 with markin
g
(
not ex-relevant
)
202.289 N/O
45 – 50 with marking 202.285 N/O
50
–
55 with markin
g
202.286 N/O
60
–
65 with markin
g
202.287 N/O
70 – 75 with marking 202.288 Change-over
60
–
65 chan
g
e-over contact 202.290 Chan
g
e-over
2.3 Temperature class
The reed switch is suitable for temperature class T4 / T125 ° C.

VKG
VKG K09/0322 Page 11
2.4 General requirements
2.4.1 Intended Use
a) To ensure safe operation, the products may only be used according to the
instructions in the assembly instructions. During use, the legal and safety
regulations required for the respective application must be observed in
addition. This applies analogously when using accessories.
b) Failure to comply with the instructions given in this excerpt or in the case of
improper handling of the product will render our liability null and void. In
addition, the warranty on products and spare parts is void.
c) The products are not safety elements in terms of their intended use.
d) Only original parts of the manufacturer may be used.
2.4.2 General safety instructions
The reed switch corresponds to the state of the art and is reliable. The reed switch
may pose a residual hazard if improperly used and operated by untrained
personnel.
Every person, responsible for the installation, commissioning, maintenance or
repair of the reed switch, must have read and understood the assembly instructions
and in particular the safety instructions.
a) Follow the general rules of technology for the selection and proper
operation of a product.
b) All connected electrical and mechanical equipment must be suitable for
the respective application.
c) Observe the notes in these operating instructions as well as the
conditions of use and permissible data that appear from the imprints /
nameplates of the respective products.
d) It must be ensured that only product protection types corresponding to
the zones are installed!
e) The product is only approved for proper and intended use in a normal
industrial atmosphere. Immersion in liquids is not permitted.
f) It must be ensured that no falling objects can hit the product.
g) The operator must ensure the lightning protection for the entire system in
accordance with local regulations.
h) It is the responsibility of the installer to ensure that the function of the
reed switch in conjunction with the individual evaluation devices functions
properly and is approved for the intended use.
i) The intrinsically safe connection - including the reed switches - must be
made via approved / tested evaluation devices, which may need to be
equipped with suitable zener barriers or switching amplifiers.

VKG
Page 12 VKG K09/0322
3. Commissioning, installation
Depending on the IP degree of protection, the time for cleaning the equipment (dust
deposits) must be specified. Other important facts:
a) The product may be put into operation in Zone 2 (Cat. 3G, EPL Gc)
or in Zone 22 (Cat. 3D, EPL Dc in intrinsically safe circuits only by
specialists with a qualification similar to a qualified person according
to TRBS 1203.
b) The requirements for simple electrical equipment that apply to the
hazardous area of Zones 1/21 according to EN 60079-11 are fulfilled.
c) The products may only be used in the usual industrial atmosphere.
In the presence of aggressive substances in the air, the manufacturer
must always be consulted. The products must be adequately
protected in adverse environmental conditions.
d) Operation of the product is only permitted in fully assembled and
undamaged enclosures. In case of possible damage, a zone
carryover may have to be considered by the operator; Moreover,
operation of the housing is not permitted if the housing is damaged.
e) The environmental conditions specified in the operating instructions
must be adhered to and protected against adverse environmental
conditions.
f) Heat radiation from foreign products / components must also be
considered.
g) The reed switch must be protected against inadmissible access of
liquids and / or soiling.
h) Fixed parts (e.g. due to frost or corrosion) must not be loosened by
force in the presence of an explosive atmosphere. Icing must
therefore be avoided.
i) The reed switch may only be subjected to minor vibrations, see also
IEC 34-14.
j) To ensure the discharge of electrostatic charges, the national
requirements must be considered.
k) In particular, isolated capacities must be prevented.
l) Only those zener barriers or switching amplifiers may be used whose
output circuits are approved / tested for use in potentially explosive
atmospheres. In Europe, use in Zones 1/21 requires an EC type-
examination certificate for the equipment concerned issued by a body
designated for explosion protection.
m) The voltage of the supply units must be less than or equal to the
voltage Ui of the reed switch.
n) The total current Io of the supply units must be less than or equal to
the current Ii of the reed switch.
o) For the installation of the intrinsically safe circuit, a control drawing
(system description) to be created by the installer / operator is
required.
p) Equipotential bonding must be established along the intrinsically safe
circuit when using a grounded supply.
q) The certificates must be taken into account, including the special
conditions specified therein.
r) Resistant parts of the product (e.g. due to frost or corrosion) must not
be forcibly loosened in the presence of an explosive atmosphere.

VKG
VKG K09/0322 Page 13
s) Within the potentially explosive area, installation may only be carried
out taking into account the locally applicable installation regulations.
The following conditions must be observed (incomplete):
t) Installation and maintenance may only be carried out in an explosion-
free atmosphere and in compliance with the regulations in force in
the country of the operator.
u) Additional precautions must be taken if the presence of hydrogen
sulphide, ethylene oxide and / or carbon monoxide is to be expected:
these substances have very low ignition energy!
v) In the presence of these substances and in the presence of a
substance of the explosion group IIC and in the case of presumably
existing potentially explosive atmosphere, only spark-free tools may
be used!
4. Maintenance, servicing
Definition of terms according to IEC 60079-17:
Maintenance and Repair: A combination of all activities performed to maintain or
recover an item in a condition that meets the requirements of the specification in
question and ensures the performance of the required functions.
Inspection: An activity involving the careful examination of an object, with the aim
of obtaining a reliable statement of the condition of the object, carried out without
disassembly or, if necessary, with partial disassembly, supplemented by measures
such as measurements becomes.
Visual inspection: A visual inspection is a test that detects visible faults, such as
missing screws, without the use of access devices or tools.
Close-up Test: A test that identifies, in addition to the aspects of visual inspection,
such errors, such as loose screws, which can only be obtained by using access
devices, such as a screwdriver, e.g. steps (if necessary), and tools are visible. For
close-up tests, housing usually does not need to be opened or the equipment must
be de-energized.
Detail test: A test that detects, in addition to the aspects of close-up testing, such
defects as, for example, loose connections that can only be recognized by opening
housings and / or, if necessary, using tools and test equipment.
a) Maintenance measures may only be carried out by qualified persons.
b) Only use accessories in potentially explosive atmospheres that comply with
all requirements of European directives and national legislation.
c) Maintenance measures with dismantling of the reed switch may only be
carried out in an ex-free atmosphere.
d) The replacement of components may only be carried out with original spare
parts, which are also approved for use in potentially explosive areas.
e) The products must be regularly maintained and cleaned in the Ex area. The
intervals are set by the operator according to the environmental demands
on site.

VKG
Page 14 VKG K09/0322
Activity
visual
inspection per
month
Close
inspection
every 6 months
detailed
inspection
every
12 months
1
Visual inspection of the reed
switch for damage, remove
dust deposits
●
2 Check for integrity and
function ●
3 Testing the entire system The responsibility of the operator
5. Troubleshooting
Products operated in conjunction with potentially explosive atmospheres must not
be modified. Repairs to the product may only be performed by specially trained and
authorized personnel.
6. Disposal
Disposal of the packaging and used parts must be in accordance with the
regulations of the country in which the product is installed.
7. Marking of the reed switch (nameplate)
In the serial number the year of manufacture can be coded; optionally, it can also
be specified as plain text.
As a rule, a readable marking has been made for the type of explosion protection
required in field use - even before the product is put into operation for the first time.
A reed switch that has already been operated in non-intrinsically safe circuits may
no longer be used in intrinsically safe circuits later on.

VKG
VKG K09/0322 Page 15
9. Commissioning
When used in machines, according to guideline 89/392/EWG, the measuring
unit should be used only when the machines fulfil the EWG-machine
guidelines.
Adjustment of the limit values
 Loosen the two fixing screws on the contact base with a screwdriver.
 Slide the switch housing to the bottom stop.
 After loosening the holding screw, remove the plug cap from the contact
base.
 Connect a suitable continuity meter to PIN 1+2 (changeover switch PIN
2+3). (see page 5).
 In case the instrument is installed, open the inlet line and introduce the
medium slowly until the top edge of the float indicates the required minimum
flow volume. The reed contact is now closed (electrical continuity).
Attention! Sudden opening of the flow can lead to pressure peaks
which can exceed the operating pressure. Water hammer can lead
to breakage of the measuring glass tube.
 Push the switch housing to the top until the reed contact just opens (no
electrical continuity).
 Fix the switch in this position by tightening the fixing screws. Replace the plug
cap. The instrument is now ready for operation.
 With correct adjustment of the limit switches a bistable switch characteristic is
achieved, i.e. the contact remains closed when the float rises above the set limit
value (PIN 1+2, or alternatively PIN 2+3 with option of changeover contact.
Hysteresis
Hysteresis is characterised by the difference between the switching on and
switching off points of the contact. By matching the magnet and reed contact
strength (AW Number) a hysteresis of approx. 3.5 mm of float movement is
achieved. At the same time it may be assured that the contacts have a bi-stable
switching characteristic.
Exceeding the Measuring Range
The flow range may be exceeded by a large margin with a non-pulsating flow. Only
a certain increase in pressure loss is experienced (The permissible maximum
operating pressure must not be exceeded).
Viscosity range
The instrument scale is suitable for a viscosity range from 1 to 760 mm2/s. Within
this range there is no necessity for recalibration.

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Page 16 VKG K09/0322
10. Maintenance
For measured media without contamination, the VKG instruments are almost
maintenance free. Where contamination or calcium or algae deposits are found on
the internal parts, the instrument should be regularly cleaned.
After removal of the upper four grub screws, the threaded connection may be taken
out of the instrument. The internal parts may be removed for cleaning. The
measuring glass may be cleaned with a suitable brush.
After cleaning, the instrument should be reassembled in the correct manner.
Please ensure that the spring is inserted into the nipple of the top threaded con-
nection. The float end with the inserted orifice must be positioned on the flow
medium inlet side.
11. Technical Information
Housing: Aluminium, anodised (not media-contacted)
Screwed fitting: VKG-x1...: Brass, nickel-plated
VKG-x2...: Stainless steel 1.4301
Float: VKG-x1...: Brass, nickel-plated
VKG-x2...: Stainless steel 1.4301
Orifice: Stainless steel 1. 4310
Spring: Stainless steel 1. 4310
Magnet: Ceramic
Measuring glass: Borosilicate glass
Seals: VKG-x1...: NBR
VKG-x2...: FPM
Max. temperature: +100 °C
Max. pressure: 12 bar
Installation position: any
Basic accuracy: ± 4% f. s.
(for a viscosity of 105 mm2/s)
Measuring error with
change in viscosity: For changes in viscosity within
1–540 mm2/s the additional
deviation is ± 5% f. s. maximum
Viscosity range: 1–540 mm2/s

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VKG K09/0322 Page 17
Contacts: for VKG-2..., VKG-3..., VKG-4...
Electrical connection: Connector DIN 43 650
Electrical switching values:
N/O contact max. 250 V
AC/DC
/ 1,5 A / 100 W / 100 VA
Changeover contact max. 250 V
AC/DC
/ 1 A / 30 W / 60 VA
N/O contact and
changeover contact (cCSAus) 230 V
DC
/ 0,26 A / 60 W,
60 V
DC
/ 1 A / 60 W ,
max. 240 V
AC
/ 0,42 A / 100 W,
100 V
AC
/ 1 A / 100 W
Contacts with VKG-2..., VKG-3..., VKG-4…, use in hazardous areas
Mechanics: The apparatus can be used as follows in
explosive atmospheres in accordance with the
applicable erection regulations on machines,
devices and plants, such as e.g. EN 1127-1,
EN 60079-14 etc.:
a) In Zone 1 (gas hazard, category 2G, EPL Gb)
in the explosion groups IIA, IIB and IIC
b) In Zone 2 (gas hazard, category 3G, EPL Gc)
in the explosion groups IIA, IIB and IIC
c) In Zone 21 (dust hazard, category 2D, EPL
Db) in the explosion groups IIIA and IIIB
d) In Zone 22 (dust hazard, category 3D, EPL
Dc) in the explosion groups IIIA and IIIB
ATEX N/O contact 41R57
...G0 and GG: II 3 G Ex ic IIC T4 Gc
II 3 D Ex ic IIIC T125 °C Dc
-20 °C ≤Ta≤80 °C
max. 250 V
AC/DC
/1.5 A/100 W/100 VA
ATEX changeover contact 41R57U
...H0 and HH: II 3 G Ex ic IIC T4 Gc
II 3 D Ex ic IIIC T125 °C Dc
-20 °C ≤Ta≤80 °C
max. 250 V
AC/DC
/1 A/30 W/60 VA
Hysteresis: approx. 3.5 mm float movement
Protection: IP 65 (electr. contact)
IP 54 (side indicator)

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Page 18 VKG K09/0322
12. Ordering Codes
Viscosity-compensated flow meters model VKG-1… (Example: VKG-1103 R15)
Measuring
range
l/min. oil
Pressure loss P (bar)
at rated flow*
Brass Stainless
steel
Contact Connection Option
Special
connection
min. max.
0.1...0.45 0.6 0.9
V
KG-1101...
V
KG-1201...
...00...=without contact
..R08=G 1/4 ..N08= 1/4 NPT
B = outlet
fernelle
thread
inlet BVB
manifold
0.2...1.2 0.04 1.0
V
KG-1102...
V
KG-1202...
..R08=G 1/4
..R15=G 1/2
..N08=1/4 NPT
..N15=1/2 NPT
0.4...2 0.04 1.0
V
KG-1103...
V
KG-1203...
0.6...3.4 0.04 0.9
V
KG-1104...
V
KG-1204...
2...8 0.06 1.0
V
KG-1105...
V
KG-1205...
3...15 0.04 1.0
V
KG-1106...
V
KG-1206... ..R15=G 1/2
..R20=G 3/4
..N15=1/2 NPT
..N20=3/4 NPT
4...20 0.04 1.0
V
KG-1107...
V
KG-1207...
2,5...45 0.08 0.4
V
KG-1108...
V
KG-1208... ..R20=G 3/4
..R25=G 1
..N20=3/4 NPT
..N25=1 NPT
5...55 0.1 1.0
V
KG-1109...
V
KG-1209...
2.5...70 0.1 1.1
V
KG-1110...
V
KG-1210...
5...80 0.1 1.0
V
KG-1111...
V
KG-1211... ..R25=G 1 ..N25=1 NPT
*The pressure loss is based on water.
Viscosity-compensated flow meters and switches model: VKG-2… (Example: VKG-2103 R15)
Measuring
range
l/min. oil
Pressure loss P (bar)
at rated flow*
Brass Stainless
steel
Contact Connection Option
Special
connection
min. max.
0.1...0.45 0.6 0.9
V
KG-2101...
V
KG-2201... ...R0...=1 N/O contact
...U0...=1 changeover
c.
...C0…=1 N/O contact
(cCSAus)
...D0...=1 changeover
c. (cCSAus)
...G0...= 1 ATEX N/O
contact
(model 41R57)
...H0...= 1 ATEX
changeover c.
(model 41R57U)
..R08=G 1/4 ..N08= 1/4 NPT
B = outlet
fernelle
thread
inlet BVB
manifold
0.2...1.2 0.04 1.0
V
KG-2102...
V
KG-2202...
..R08=G 1/4
..R15=G 1/2
..N08=1/4 NPT
..N15=1/2 NPT
0.4...2 0.04 1.0
V
KG-2103...
V
KG-2203...
0.6...3.4 0.04 0.9
V
KG-2104...
V
KG-2204...
2...8 0.06 1.0
V
KG-2105...
V
KG-2205...
3...15 0.04 1.0
V
KG-2106...
V
KG-2206... ..R15=G 1/2
..R20=G 3/4
..N15=1/2 NPT
..N20=3/4 NPT
4...20 0.04 1.0
V
KG-2107...
V
KG-2207...
2,5...45 0.08 0.4
V
KG-2108...
V
KG-2208... ..R20=G 3/4
..R25=G 1
..N20=3/4 NPT
..N25=1 NPT
5...55 0.1 1.0
V
KG-2109...
V
KG-2209...
2.5...70 0.1 1.1
V
KG-2110...
V
KG-2210...
5...80 0.1 1.0 VKG-2111... VKG-2211... ..R25=G 1 ..N25=1 NPT
*The pressure loss is based on water.
Viscosity-compensated flow meters and switches with 2 contacts model: VKG-3… (Example: VKG-3103 R15)
Measuring
range
l/min. oil
Pressure loss P (bar)
at rated flow*
Brass Stainless
steel
Contact Connection
min. max.
0.1...0.45 0.06 0.9
V
KG-3101...
V
KG-3201... ...RR...=1 N/O contact
...UU...=1 changeover c.
...CC…=1 N/O contact
(cCSAus)
...DD...=1 changeover c.
(cCSAus)
...GG...= 2 ATEX
N/O contact
(model 41R57)
...HH...= 2 ATEX
changeover c.
(model 41R57U)
..R08=G 1/4 ..N08= 1/4 NPT
0.2...1.2 0.04 1.0
V
KG-3102...
V
KG-3202...
..R08=G 1/4
..R15=G 1/2
..N08=1/4 NPT
..N15=1/2 NPT
0.4...2 0.04 1.0
V
KG-3103...
V
KG-3203...
0.6...3.4 0.04 0.9
V
KG-3104...
V
KG-3204...
2...8 0.06 1.0
V
KG-3105...
V
KG-3205...
3...15 0.04 1.0
V
KG-3106...
V
KG-3206... ..R15=G 1/2
..R20=G 3/4
..N15=1/2 NPT
..N20=3/4 NPT
4...20 0.04 1.0
V
KG-3107...
V
KG-3207...
2,5...45 0.08 0.4
V
KG-3108...
V
KG-3208... ..R20=G 3/4
..R25=G 1
..N20=3/4 NPT
..N25=1 NPT
5...55 0.1 1.0
V
KG-3109...
V
KG-3209...
2.5...70 0.1 1.1
V
KG-3110...
V
KG-3210...
5...80 0.1 1.0 VKG-3111... VKG-3211... ..R25=G 1 ..N25=1 NPT
*The pressure loss is based on water.

VKG
VKG K09/0322 Page 19
Viscosity-compensated flow meters and switches with side indicator model: VKG-4…
(Example: VKG-4103 R15)
Measuring
range
l/min. oil
Pressure loss P (bar)
at rated flow*
Brass Stainless
steel
Contact Connection Option
Special
connection
min. max.
0.1...0.45 0.06 0.9
V
KG-4101...
V
KG-4201... ...R0...=1 N/O contact
...U0...=1 changeover
contact
...C0...=1 N/O contact
(cCSAus)
...D0...=1 changeover
c. (cCSAus)
...G0...= 1 ATEX N/O
contact
(model 41R57)
...H0...= 1 ATEX
changeover c.
(model 41R57U)
..R08= G 1/4 ..N08= 1/4 NPT
B = outlet
fernelle
thread
inlet BVB
manifold
0.2...1.2 0.04 1.0
V
KG-4102...
V
KG-4202...
..R08= G 1/4
..R15= G 1/2
..N08= 1/4 NPT
..N15= 1/2 NPT
0.4...2 0.04 1.0
V
KG-4103...
V
KG-4203...
0.6...3.4 0.04 0.9
V
KG-4104...
V
KG-4204...
2...8 0.06 1.0
V
KG-4105...
V
KG-4205...
3...15 0.04 1.0
V
KG-4106...
V
KG-4206... ..R15= G 1/2
..R20= G 3/4
..N15= 1/2 NPT
..N20= 3/4 NPT
4...20 0.04 1.0
V
KG-4107...
V
KG-4207...
2,5...45 0.08 0.4
V
KG-4108...
V
KG-4208... ..R20= G 3/4
..R25= G 1
..N20= 3/4 NPT
..N25= 1 NPT
5...55 0.1 1.0
V
KG-4109...
V
KG-4209...
2.5...70 0.1 1.1
V
KG-4110...
V
KG-4210...
5...80 0.1 1.0 VKG-4111... VKG-4211... ..R25= G 1 ..N25= 1 NPT
*The pressure loss is based on water.
13. Recommended Spare Parts
Only the instrument parts and materials are listed.
Depending on the instrument type, the parts are available in different sizes.
(When ordering, please give the instrument type).
1.1) Float brass
1.2) Float Stainless Steel
2.1) Spring
3.1) O ring set NBR
3.2) O ring set FPM
4.1) Contact (Normally Open)
4.2) Contact (Changeover switch)
5.1) Spare glass with scale
6.1) Spare part package (glass, spring, brass float)
6.2) Spare part package (glass, spring, stainless steel float)
We recommend the use of a combined spring, glass and float to maintain
measuring accuracy.

VKG
Page 20 VKG K09/0322
14. Dimensions
Model VKG-1..., VKG-2..., VKG-3... Model VKG-4...
Model D
[mm]
AF
[mm]
Weight (kg) VKG-1..
Standard
connection
Special
connection
VKG-..01 48 41 0.9 0.9
VKG-..02 48 41 0.9 0.8
VKG-..03 48 41 0.9 0.8
VKG-..04 48 41 0.9 0.8
VKG-..05 48 41 0.9 0.8
VKG-..06 48 41 0.8 0.8
VKG-..07 48 41 0.8 0.8
VKG-..08 48 41 0.8 0.7
VKG-..09 48 41 0.8 0.7
VKG-..10 48 41 0.8 0.7
VKG-..11 48 41 0.7 0.7