Kobold BVO Series, RVO-11 Series, BVO-12 Series, BVO-11 Series, RVO Series Operating Instruction

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: [e-mail]

Internet: www.kobold.com

BVO, RVO

BVO, RVO K01/0316 Page 3

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.

BVO; RVO

Page 4 BVO, RVO K01/0316

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.

BVO, RVO

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.

BVO; RVO

Page 6 BVO, RVO K01/0316

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.

BVO, RVO

BVO, RVO K01/0316 Page 7

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 bi­stable 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).

BVO; RVO

Page 8 BVO, RVO K01/0316

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. T echnical 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.

BVO, RVO

BVO, RVO K01/0316 Page 9

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

BVO; RVO

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