Kobold BVO Series User manual

Operating Instruction
for
Flowmeter and Monitor
Model: BVO, RVO

BVO; RVO
Page 2 BVO, RVO K01/0316
1.Contents
1.Contents........................................................................................................2
2.Note ..............................................................................................................3
3.Regulated usage...........................................................................................3
4.Operating Principle........................................................................................4
5.Instrument Inspection....................................................................................4
6.Mechanical connection..................................................................................5
7.Electrical connection.....................................................................................6
8.Commissioning of the Instruments................................................................7
9.Maintenance .................................................................................................8
10.Technical Specifications................................................................................8
11.Dimensions and Pressure Losses.................................................................9
12.Recommended Spare Parts..........................................................................9
13.EU Declaration of Conformance..................................................................10
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

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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.
PED 2014/68/EU
In acc. with Article 4 Paragraph (3), "Sound Engineering Practice", of the
PED 2014/68/EU no CE mark.
Table 8, Pipe, Group 1 dangerous fluids
3. Regulated usage
Model BVO and RVO instruments are used for monitoring of fluid flows. Only
clean, low viscosity and homogenous media may be measured, which do not
affect the materials used in the instrument casing. Large measuring errors will
occur when using high viscosity media. Large dirt particles can lead to blocking of
the float and therefore large measurement and signal errors. Ferritic particles that
deposit on the float body (with internal magnet) can also lead to a similar effect
therefore we recommend a magnet filter.
The instruments are provided as follows:
Flow measurement
The actual flow can be read locally at the instrument.
The scale shows the flow rate directly in litres per minute of water.
Limit Value Contacts
For the monitoring of the flow rate, the instruments can be fitted with one or two
adjustable limit value contacts.
Standard Design: Normally open (with rising flow)
Special Design: Changeover switch (SPDT)
Special Design: Ex-contact N/O, Ex-contact SPDT
The contact is adjustable over the full measuring range.

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Standard Material Combinations
Model : BVO-11.. Model : BVO-12.. Model : RVO-11..
Material: Brass Material: St.St. Material: Brass
Slotted nozzel Brass, nickel plated 1.3955 Brass, nickel plated
Connection Brass, nickel plated 1.4301 Brass, nickel plated
Float Brass, nickel plated 1.4301 Brass, nickel plated
Measuring Tube Borosilicat Borosilicat Borosilicat
O-Rings Perbunan Viton Perbunan
Tmax 100° C 100° C 100° C
Pmax 10 bar 10 bar 10 bar
4. Operating Principle
5. Instrument Inspection
The instruments are inspected before dispatch and sent out in perfect condition.
Should damage to the instrument be visible, we recommend close inspection of
the delivery package. In cases of damage, please immediately inform the
shippers as they are liable for any damage in transit.
Scope of delivery:
All Parts belonging to the standard scope of supply are attached to the
instrument.
The model BVO and RVO flow monitors are
based on the principle of the well-known float
type flowmeters except for the conventional
upward tapering measuring tube. These
patented instruments are provided instead
with a cylindrical guidetube with conical slots
along the periphery. A float is found in this
tube which, by means of the flow of the
medium, is raised in the tube. Each float
position corresponds to a certain flow.
Permanent magnets are inserted in the float
which activates reed switches mounted
outside of the flow throughput. The activation
of the contacts is carried out by means of
magnetic field, ie: the contact is hermetically
separated from the flowing medium.

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BVO, RVO K01/0316 Page 5
6. Mechanical connection
Before installation:
Please ascertain whether the allowable maximum operating pressure and
operating temperature of the instruments will not be exceeded (See Standard
Material Combinations).
The instrument should be installed in a vertical position in the pipework. The
flow direction is from bottom to top.
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.
While mounting please check that there is no mechanical stress applied to the
process connectors. We recommend a fastening of the input and output pipes
approx. 50 mm in front of and behind the connectors.
Do not install the instrument within an induction field.
Warning: When mounting the meters secure the process connectors by
means of a suitable wrench. Failure to do so may result in a damage of the
measuring glass.
Check that the connection thread to pipe is fully sealed immediately after
mechanical installation (See Commissioning of the Instruments).
Warning: With outside installation please keep in mind that the measuring
glass may be destroyed at low temperatures by freezing of the medium.

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7. Electrical connection
Ensure that the power is disconnected during connection of the cable.
Loosen the holding screw on 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. Wiring for EX-Switches:
EX-N/O: brown / blue
EX-SPDT: black / blue N/C
black / brown N/O
Examples for Contact Protection Measures
For capacitive and inductive loads (long cables and replays) we recommend
protective switching.
Connect the plug to the contact connections
and secure it with the holding screw.
Warning: The given electrical values of the
reed contacts may not be exceeded even
for short periods. For higher switching
values we recommend contact protection
relays or other contact protection
measures.
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.

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8. Commissioning of the Instruments
The use of this meter in machines acc. to directive 89/392/EWG is prohibited until
the complete machine complies to this directive.
Adjustment of the limit values
Adjust the switch in this position by means of tightening the fixing screws.
Replace the plug cap and the instrument is now ready for operation.
If the limit switch is adjusted correctly, a bi-stable 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).
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
sensitivity (AW Number) a hysteresis of approx. 6-10 mm way of float movement
is achieved. At the same time it may be assured that the contacts have a bi-
stable switching characteristic.
Loosen the two fixing srews on the contact base.
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).
When 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).
Warning: Sudden opening or closing of the flow line
may result in pressure peeks several times higher
than the system pressure. This may cause the
destruction of the measuring glass.
When the instrument is not yet installed, the float may
be lifted with a suitable tool.
Push the switch housing to the top until the reed
contact opens
(no electrical continuity).

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Exceeding the Measuring Range:
Warning: Continuously exceeding the measuring range together with
pulsating flow results in the float hitting the upper stop continuously which
can lead to increased wear in the instrument. When such cases occur,
please contact the supplier.
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).
9. Maintenance
For measured media without contamination, the BVO or RVO instrument is
almost maintenance-free. Where contamination or calcium or algae deposits are
found on the internal parts, the instrument should be regularly cleaned.
The instrument may be removed from the pipe with a suitable open ended
spanner. The internal parts are accessible for cleaning after removing the top
connection. The internal parts may be cleaned with a suitable brush. After
cleaning, the instrument should be reassembled in the correct manner. We
recommend that the O - rings of the screwed connections are changed
10. Technical Specifications
Measurement and switch accuracy: ±10 % of full scale value
Max. Operating Pressure: 10 bar
Max. Medium Temperature: 100° C
Protection acc. to EN 60529: IP 65
Approvals: SEV, UL, CSA
Electrical Switch Values
N/O: 240 VAC, 100 VA, 1.5 A (SEV, CSA)
SPDT: 240 VAC, 60 VA, 1 A (SEV, CSA)
N/O, EEx d IIC T6: 250 VAC, 2 A, 80 VA
SPDT EEx d IIC T6: 250 VAC, 1 A, 60 VA
For instruments with UL-approval, see switch values on contact housing.

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11. Dimensions and Pressure Losses
Instrument size SW G L (mm) B (mm) T (mm) D (mm)
BVO-..01 to BVO-..10 32 1/4 (1/2) 135 39 39 ---
BVO-..16 32 1/2 (3/4) 164 39 39 ---
BVO-..50 41 3/4 (1) 163 (174) 45 45 ---
RVO-..01 to RVO-..02 32 1/4 135 --- --- 43
RVO-..06 to RVO-..10 32 1/4 (1/2) 135 --- --- 43
RVO-..16 32 1/2 (3/4) 165 --- --- 43
RVO-..55 41 3/4 (1) 163 (174) --- --- 48
* without switch, with switch add 52,5 mm
12.Recommended Spare Parts
Only the parts of the instruments and the materials are listed. Depending on the
instrument model, the parts are available in different sizes (When ordering please
give the instrument model).
1.1 Float Brass 4.1 Contact (Normally open)
1.2 Float Stainless Steel 4.2 Contact (SPDT)
2.1 Slotted nozzle Brass 4.3 Ex-contact (Normally open)
2.2 Slotted nozzle Stainless Steel 4.4 Ex-contact (SPDT)
3.1 O-Ring set Perbunan 5.1 Spare glass with scale
3.2 O-Ring set Viton

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Page 10 BVO, RVO K01/0316
13.EU Declaration of Conformance
We, KOBOLD-Messring GmbH, Hofheim-Ts, Germany, declare under our sole
responsibility that the product:
Flowmeter and switch Model BVO and RVO
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 60529:2014
Degrees of protection provided by enclosures (IP Code)
Also the following EC guidelines are fulfilled:
2014/35/EU Low Voltage Directive
2011/65/EU RoHS
Hofheim, 6. April 2016
H. Peters M. Wenzel
General Manager Proxy Holder