Kobold BGN User manual

Operating Instructions
for
Full Metal Variable Area
Flow Meter and Counter
Model: BGN
O
Or rd de er r f fr ro om m: :
C
C A A B Br ri ig gg gs s C Co om mp pa an ny y
622 Mary Street; Suite 101; Warminster, PA 18974
Phone: [phone] - Fax: [phone]
Sa[email protected] - www.cabriggs.com

BGN
BGN K01/0908 Page 2
Contents
1IDENTIFICATION ............................................................................................................................................................... 4
1.1 Supplier/manufacturer ................................................................................................................................ 4
1.2 Product type.................................................................................................................................................. 4
1.3 Product name................................................................................................................................................ 4
2APPLICATIONS ................................................................................................................................................................. 4
3OPERATIONAL MODE AND SYSTEM DESIGN............................................................................................................... 4
3.1 Measuring principle ..................................................................................................................................... 4
3.2 System design................................................................................................................................................ 4
4INPUT 4
4.1 Measured variable........................................................................................................................................ 4
4.2 Measuring range (lower-range and upper-range value)........................................................................... 4
5OUTPUT6
5.1 Binary output................................................................................................................................................ 6
5.1.1 KEI 1 or KEI 2 limit transducers.................................................................................................... 6
5.1.2 KEM 1 or KEM 2 limit transducers (special version) .................................................................... 6
5.2 Analog output with the ES magneto-electric transmitter......................................................................... 6
5.3 Analog output with the KINAX 3W2 angle-of-rotation transmitter ....................................................... 6
6CHARACTERISTIC VALUES............................................................................................................................................. 6
6.1 Measuring accuracy ..................................................................................................................................... 6
6.1.1 Reference conditions ...................................................................................................................... 6
6.1.2 Measured error ............................................................................................................................... 6
6.1.3 Repeatability................................................................................................................................... 6
6.2 Influence of ambient temperature .............................................................................................................. 6
6.3 Influence of fluid temperature .................................................................................................................... 6
7CONDITIONS OF USE ....................................................................................................................................................... 6
7.1 Mounting requirements ............................................................................................................................... 6
7.1.1 Mounting/start-up........................................................................................................................... 7
7.1.2 Device settings ............................................................................................................................... 7
7.1.3 Adjusting the limit transducer ........................................................................................................ 7
7.1.4 Operation in hazardous areas.......................................................................................................... 8
7.2 Ambient conditions ...................................................................................................................................... 9
7.2.1 Ambient temperature ranges........................................................................................................... 9
7.2.2 Storage temperature........................................................................................................................ 9
7.2.3 Climatic category ........................................................................................................................... 9
7.2.4 Degree of protection....................................................................................................................... 9
7.2.5 Shock resistance/vibration resistance ............................................................................................. 9
7.2.6 Electromagnetic compatibility........................................................................................................ 9
7.3 Fluid conditions ............................................................................................................................................ 9
7.3.1 Fluid temperature ranges ................................................................................................................ 9
7.3.2 Diagrams: Max. ambient temperature based on the fluid temperature for the ES.......................... 9
7.3.3 Fluid pressure limit....................................................................................................................... 10
7.3.4 Inlet and outlet sections................................................................................................................ 10
7.3.5 Physical state ................................................................................................................................ 10
7.3.6 Density ......................................................................................................................................... 10
7.3.7 Viscosity....................................................................................................................................... 10
7.3.8 Pressure (for gas measurement).................................................................................................... 10
7.3.9 Pressure loss ................................................................................................................................. 10
8CONSTRUCTION DETAILS............................................................................................................................................. 11
8.1 Type of construction/dimensions .............................................................................................................. 11

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Page 3 BGN K01/0908
8.1.1 Aluminum indicator housing........................................................................................................ 11
8.1.2 Dimension drawing for heating connection.................................................................................. 11
8.1.3 Indicator housing made of stainless steel ..................................................................................... 12
8.2 Weight ......................................................................................................................................................... 12
8.3 Material....................................................................................................................................................... 13
8.4 Process connection ..................................................................................................................................... 13
8.5 Magnetic filter ............................................................................................................................................ 13
8.6 Electrical connection.................................................................................................................................. 14
8.6.1 Wiring diagram for ES transmitter (signal output 4-20 mA with HART)................................. 14
8.6.2 Wiring diagram for ES transmitter with 4-20 mA output and 2 limit transducers ....................... 14
8.6.3 Wiring diagram for ES transmitter with 4- 20 mA output, pulse output and limit transducer ..... 15
8.6.4 Wiring diagram for inductive limit transducers............................................................................ 15
8.6.5 Wiring diagram for KINAX 3W2 transmitter with 4-20 mA output, 2 wires .............................. 16
8.6.6 Wiring diagram for KINAX 3W2 transmitter with 4-20 mA output, 3 wires .............................. 16
8.6.7 Wiring diagram for KINAX 3W2 transmitter with 4-20 mA output, 4 wires .............................. 17
8.6.8 Wiring diagram for KEM 1 and KEM 2 double-throw microswitches ........................................ 17
9INDICATOR UNIT............................................................................................................................................................. 18
10 AUXILIARY POWER ........................................................................................................................................................ 18
11 CE MARK ......................................................................................................................................................................... 18
12 ORDER INFORMATION................................................................................................................................................... 18
12.1 Available accessories ................................................................................................................................ 18
13 STANDARDS AND DIRECTIVES, CERTIFICATES AND APPROVALS........................................................................ 18
14 SAFETY INSTRUCTIONS ................................................................................................................................................ 18
14.1 Intended use .............................................................................................................................................. 18
14.2 Installation, start-up and operating personnel ...................................................................................... 18
15 PACKAGING, MOUNTING AND SHIPMENT .................................................................................................................. 18
16 MAINTENANCE................................................................................................................................................................ 18
17 INSTALLING AND REMOVING CONE, FLOAT, DAMPING SETS/SPRING STOP....................................................... 19
18 TROUBLE SHOOTING..................................................................................................................................................... 19
19 RETURNING DEVICES FOR REPAIR AND SERVICE ................................................................................................... 19
20 REPLACEMENT PARTS.................................................................................................................................................. 19
21 EXPLODED VIEWS.......................................................................................................................................................... 20
21.1 Fitting with measuring element............................................................................................................... 20
21.1.1 BGN-.... Standard version ........................................................................................................... 20
21.1.2 BGN-.... with spring stop ............................................................................................................ 20
21.1.3 BGN-.... with damping piston ...................................................................................................... 20
21.1.4 BGN-.... with damping piston and spring stop ............................................................................. 21
21.1.5 BGN-.... small measuring ranges.................................................................................................. 21
21.2 Indicator unit ............................................................................................................................................ 22
21.2.1 Complete indicator unit, local with scale ..................................................................................... 22
21.2.2 Complete indicator unit with 1 SJ 3,5 N limit transducer ............................................................ 22
21.2.3 Complete indicator unit with 2 SJ 3,5 N limit transducers........................................................... 22
21.2.4 Complete indicator unit with E2 KINAX Ex transmitter ............................................................. 23
21.2.5 Complete indicator unit with E2 KINAX Ex transmitter and 1 SJ 3,5 N limit transducer........... 23
21.2.6 Indicator unit with transmitter type ES Ex HART.................................................................... 23
22 DECONTAMINATION CERTIFICATE FOR DEVICE CLEANING ................................................................................... 24
23 EC TYPE EXAMINATION CERTIFICATE........................................................................................................................ 25
24 SALES REPRESENTATIVES .......................................................................................................................................... 30
25 NOTES30

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BGN K01/0908 Page 4
Introduction
These Installation and Operating Instructions serve as a tool
for the correct installation, operation and maintenance of the
device. They are a supplement to the BGN Device
Description. Read the manual carefully before the device is
installed and put into use. It does not include special
versions or applications.
All devices are thoroughly checked for order compliance and
operability before delivery. Upon receipt, please conduct a
visual inspection of possible damage that may be identified
as having occurred during shipment. If you discover any
defect, please contact our head office in Cologne or the local
sales office responsible for your area (see the telephone
directory at the end of this manual or on our Web site).
Apart from a description of the error, we will need the
equipment type and serial number of the delivery.
Kobold Messring shall not furnish guarantee for any repair
work done without prior notice. Unless otherwise agreed on,
the rejected parts must be made available to us in case a
claim is made.
1 Identification
1.1 Supplier/manufacturer
Kobold Messring GmbH
Nordring 22 - 24 ⋅
D-65719 Hofheim/Taunus
Phone [phone]
Fax [phone]
Internet: http://www.kobold.com
E-mail: mailto:[e-mail]
1.2 Product type
Flowmeter in all-metal design based on the float principle
1.3 Product name
BGN with subgroups
BGN-S (stainless steel)
BGN-P (PTFE)
BGN-H (Hastelloy)
2 Applications
The BGN meter is suitable for flow measurement of liquid or
gaseous products in pipes. It shows the current flow rate in
volume or mass per unit in time.
Applications: flow measurement, dosing, monitoring,
adjusting and control of liquid and gaseous products.
The meter’s design makes it ideal for processes under
difficult and adverse operating conditions.
The devices are available with additional electrical
equipment for process monitoring and control.
3 Operational mode and system
design
3.1 Measuring principle
The measuring element consists of a sharp-edged
measuring ring (1) and a conical float (2). A medium flows
from the bottom to the top through the measuring ring, lifting
the float until the buoyancy force (A) and the weight of the
float (Gs) establish equilibrium. As the height of the float
varies, an annular clearance (S) proportional to the flow
appears between the float and the measuring ring. The
height of the float in the measuring ring is a measure of the
flow. The permanent magnet (3) embedded in the float then
transmits this measure to the scale and the optional
electronic evaluators through a magnet tracking indicator
system (4).
3.2 System design
The meter consists of a cylindrical fitting pipe with flange
connections on both sides. For the measuring range from
5 to 50 l/h, a measuring ring is inserted in the tube in which a
conical float can move with vertical freedom. For small
measuring ranges of up to 4–40 l/h, the measuring cell
consists of a conical measuring tube with cylindrical float.
The height of the float resulting from the flow rate is
transmitted in a rotary motion by a built-in permanent
magnet through a magnet tracking indicator system in a
rotation to the pointer axis of the analog indicator unit.
4 Input
4.1 Measured variable
Volume flow
4.2 Measuring range (lower-range and
upper-range value)
The lower-range value is considered 10 % of the upper-
range value. Measuring range span: 10-100 %
Smallest measuring range: 0.5-5.0 l/h water
Largest measuring range: 8.000-80.000 l/h water (stainless
steel)

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Page 5 BGN K01/0908
Measuring range table
Nominal
size (DN)
Measuring
range
Measuring range for
water at 1000 kg/m3
Measuring range for air
at 1.013 bars absolute
pressure
Pressure loss
(mbar)
Remarks
15 A 0.5– 5.0 I/h 0.015 – 0.15 m
3
/h 40 1)+2)
B 1.0 – 10 I/h 0.03 – 0.30 m
3
/h 44 1)+2)
C 1.6 – 16 I/h 0.045 – 0.48 m
3
/h 40 1)+2)
D 2.5 – 25 I/h 0.075 – 0.75 m
3
/h 40 +2)
E 4.0 – 40 I/h 0.13 – 1.3 m
3
/h 40 +2)
F 5.0 – 50 I/h 0.15 – 1.5 m
3
/h 40
G 7.0 – 70 I/h 0.2 – 2.1 m
3
/h 40
H 10 – 100 I/h 0.3 – 3.0 m
3
/h 60
I 16 – 160 I/h 0.5 – 4.6 m
3
/h 60
J 25 – 250 I/h 0.7 – 7.0 m
3
/h 60
K 40 – 400 I/h 1.0 – 11 m
3
/h 70
L 60 – 600 I/h 1.7 – 17 m
3
/h 80
M 100 – 1000 I/h 3 – 30 m
3
/h 60 5)
N 160 - 1600 I/h 4 – 46 m
3
/h 70 5)
P 250 – 2500 I/h 7 – 70 m
3
/h 100 5)
25 A 0.5 – 5.0 I/h 0.015 – 0.15 m
3
/h 40 1)+2)
B 1.0 –10 I/h 0.03 – 0.30 m
3
/h 40 1)+2)
C 1.6 –16 I/h 0.045 – 0.48 m
3
/h 40 1)+2)
D 2.5 – 25 I/h 0.075 – 0.75 m
3
/h 40 +2)
E 4.0 – 40 I/h 0.13 – 1.3 m
3
/h 40 +2)
F 5.0 – 50 I/h 0.15 – 1.5 m
3
/h 40
G 7.0 – 70 I/h 0.2 – 2.1 m
3
/h 40
H 10 – 100 I/h 0.3 – 3.0 m
3
/h 60
I 16 – 160 I/h 0.5 – 4.6 m
3
/h 60
J 25 – 250 I/h 0.7 – 7.0 m
3
/h 60
K 40 – 400 I/h 1.0 – 11 m
3
/h 70
L 60 – 600 I/h 1.7 – 17 m
3
/h 80
M 100 – 1000 I/h 3 – 30 m
3
/h 60
N 160 – 1600 I/h 4 – 46 m
3
/h 70
P 250 – 2500 I/h 7 – 70 m
3
/h 100
Q 400 – 4000 I/h 11 – 110 m
3
/h 240 3)+ 4)
40 P 250 – 2500 I/h 7 – 70 m
3
/h 50 3)
Q 400 – 4000 I/h 11 – 110 m
3
/h 120 3)
R 600 – 6000 I/h 17 – 170 m
3
/h 180 3)
50 Q 400 – 4000 I/h 11 – 110 m
3
/h 80
R 600 – 6000 I/h 17 – 170 m
3
/h 90
S 1000 – 10000 I/h 29 – 290 m
3
/h 110
T 1600 –16000 I/h 46 – 460 m
3
/h 230
U 2500 – 25000 I/h 70 – 700 m
3
/h 500 3)+ 4)
80 T 1600 – 16000 I/h 46 – 460 m
3
/h 70
U 2500 – 25000 I/h 70 – 700 m
3
/h 100
V 4000 – 40000 I/h 110 – 1100 m
3
/h 350
100 V 4000 – 40000 I/h 110 – 1100 m
3
/h 120
W 6000 – 60000 I/h 170 – 1700 m
3
/h 360
X 8000 – 80000 I/h 240 - 2400 m
3
/h 600 3)+ 4)
1) for P version (PTFE), float with tantalic collar, cone of borosilicate glass
measuring range: A 0.7–7.0 l/h, B 1.2–12 l/h, C 2.0–20 l/h
2) gas throttle in S version for gas measurement included in price (pressure loss 200 mbar)
3) not available in P version
4) conversion not possible
5) only in S and H version, only with smaller sealing strip

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BGN K01/0908 Page 6
5 Output
Various electrical contact makers or transmitters may be
installed in the indicator unit.
5.1 Binary output
Using the segments of the slot-type initiators or the eccentric
discs of the microswitches, any switching point between
10 % and 90 % of the flow rate can be set.
5.1.1 KEI 1 or KEI 2 limit transducers
1 or 2 limit transducers,
type SJ 3,5N, make Pepperl+Fuchs
(special switch possible, e.g. SN version)
Safety class: PTB Nr. 99 ATEX 2219 X
PTB Nr. 00 ATEX 2048 X
5.1.2 KEM 1 or KEM 2 limit transducers
(special version)
Double-throw microswitches whose switching point is
activated by a cam plate.
KEM 1 = 1 Double-throw microswitch
KEM 2 = 2 Double-throw microswitches
Maximum make-break capacity:
230 VAC 50/60Hz 6 A
24 VDC 0.5 A
110 VDC 0.2 A
5.2 Analog output with the ES
magneto-electric transmitter
The magneto-electric transmitter is factory-calibrated to the
scale values upon shipment. The signal output is supplied
exclusively in a two-wire connection at 4-20 mA. Normally,
the 4-20 mA signal has the HARTprotocol; alternatively it
can have PROFIBUS PA.
Additional options: 2 limit values, alternatively 1 limit value
and 1 pulse output
The signal output and the limit values can be configured
using a HARTmodem operating on the following
configuration programs: SensorPort from Bopp & Reuther,
PDM from Siemens or AMS from Rosemount. Furthermore,
a HARThand-held terminal (with DD software) can also be
used. For more information about configuration, please refer
to the separate Operating Instructions for the ES.
Safety class: DMT 00 ATEX 075 / II2G EEx ia IIC T6
When installing electrical equipment in hazardous areas,
the conditions and provisions specified in the approval
docmuments must be followed.
5.3 Analog output with the KINAX 3W2
angle-of-rotation transmitter
The signal output of the angle-of-rotation transmitter is
factory-calibrated to the scale values. The signal output is 4-
20 mA in 2-wire connection; or alternatively 0-20 mA in 4- or
3-wire connection. The signal output of 4 mA corresponds to
the flow rate scale value of 0 (0 mA for the 0-20 mA version).
5.6 mA corresponds to 10 % of the flow rate scale value
(2 mA). 20 mA corresponds to 100 % of the flow rate scale
value.
Use in hazardous areas:
The angle-of-rotation transmitter is a component approved
for hazardous areas. When used in hazardous areas, all the
values and instructions indicated in the certificate of approval
must be observed. Auxiliary power is fed through an
approved intrinsically safe circuit of 12-30 V. To prove
intrinsic safety, only authorized electrical equipment may be
interconnected. Please take note of the maximum
permissible ambient temperature of 60 °C/75 °C for the
transmitter and the process temperature.
Safety class:
PTB 97 ATEX 2271 / II 2G EEx ia IIC T6
6 Characteristic values
6.1 Measuring accuracy
6.1.1 Reference conditions
Water 20 °C
6.1.2 Measured error
(for liquids)
BGN-S/H/P +/- 1.6 % of URV for local display
(URV = upper-range value)
(for gases)
BGN-S/H/P +/- 2.0 % of URV for local display
Additional inaccuracy for:
ES = +/- 0.2 %
KINAX 3W2 = +/- 0.5 %
6.1.3 Repeatability
+/- 0.5 % of upper-range value
6.2 Influence of ambient temperature
1. Without electrical equipment and with limit transducer
without influence
2. With KINAX transmitter:
+/- 0.2 % / 10 K reference temperature 23 °C
3. With ES transmitter:
+/- 0.5 % / 10 K reference temperature 22 °C
6.3 Influence of fluid temperature
Deviations in fluid temperature from the temperature
observed during calibration can result in a proportional
display fault because of the corresponding change in
density. Changes in viscosity cause a non-linear display
fault.
7 Conditions of use
The VDI/VDE guidelines 3513, Sheet 3, must be observed.
The meter is suitable for :
1) Liquids with sufficient flowability that are free of
solids, do not bond and do not tend to settle.
2) Gases with linear flow behavior and an adequate
inlet pressure.
7.1 Mounting requirements
The mounting location must be suitable for a vertical
direction of flow from the bottom to the top.
Important: If that is impossible, then the device type BGF
may be utilized. This device can be used for both horizontal
and vertical direction of flow.

BGN
Page 7 BGN K01/0908
The limit values for temperature and air humidity at the
mounting location must be maintained. Avoid corrosive
atmospheres. If this cannot be avoided, ventilation must be
installed.
Please make sure that there is adequate clearance from
parts that might cause magnetic interferences such as
solenoid valves and ferromagnetic components like steel
brackets/supports. We recommend that the minimum lateral
distance between two adjacently mounted devices be
300 mm. The devices can be mounted close together if
vertically offset by one device length. The minimum lateral
clearance for interfering steel parts should be 200 mm. In
case of doubt, check the interference by moving the device
back and forth in the selected distance by about 200 mm
and testing whether the pointer position changes.
Select the mounting location so as to enable a reliable
reading of the scale values. Please take note as well of the
space requirement for any possible disassembly of the
device. As a rule, inlet and outlet sections in front of and
behind the device are unnecessary if the medium has a
linear flow profile. Avoid mounting accessories converging
on one side in front of the device. However, if this is
indispensable maintain a minimum device length of 250 mm
as an inlet section.
The nominal size of the pipes to be connected must
correspond to that of the meter. Avoid fittings converging on
one side directly in front of the device. As a rule, install
valves behind the measuring equipment if there are gases
involved.
7.1.1 Mounting/start-up
The device must be mounted in accordance with the
direction of flow from the bottom to the top (perpendicularly).
Please observe the prior reference to the BGF-type device.
The nominal size of the device and that of the pipes must be
the same. The pressure stages and, hence, the dimensions
of the flanges must coincide. The surface roughness of the
flange sealing surface must be suitable for the prescribed
gaskets.
Please check whether possible accessories like spring
stops, gas/liquid-type dampers are still correctly sitting on the
flange. Check whether the mounting clearance between the
flanges of the pipes corresponds to the assembly dimension
of the device plus two gaskets. To achieve stress-free
mounting, the flanges of the pipes must be aligned parallel to
each other.
Use connecting bolts and gaskets in the prescribed
dimensions. The gaskets must be suitable for the operating
pressure, the temperature and the measured medium. With
PTFE-coated devices, use gaskets whose interior and
exterior diameter correspond to the sealing strip of the
device.
Tighten the screws crosswise so that the process
connections are tight. See to the tightening torques of
screws especially with PTFE-coated devices.
The maximum torques for PTFE-coated devices are:
DN15/DN25 = 14 Nm/DN50 = 25 Nm/DN80 = 35 Nm/DN100
= 42 Nm (following VDI/VDE Guideline 3513).
Please check whether the pipe is adequately stable to rule
out the possibility of vibration or swinging of the device. (Do
not use steel mounting parts on the device.)
When gas is used as the medium, pay special attention to
the position of the valve. If the device is calibrated to more
than 1.013 bars absolute pressure, the valve is usually
installed behind the flowmeter. At 1.013 bars absolute
pressure (free exhaust) install it in front of the device.
If there is risk of dirt or solid matter penetrating the process
pipes, flush them beforehand so that these materials do not
get caught in the device. Ferromagnetic solid matter such
as spatter can lead to the breakdown of the device. If these
materials are still present during normal operating
conditions, mount a magnetic filter (accessory) in front of the
device. When using liquids, flush to avoid a surge of gas
bubbles. Slowly increase the supply pressure when using
gases to prevent pressure surges. Basically, avoid
activation using solenoid valves to prevent the float from
shooting upwards.
7.1.1.1 Gas measurement
When using gases, slowly let the operating pressure rise. At
the same time, vary the operating pressure through a setting
valve so that the float is not knocked around since otherwise
this would damage the measuring element.
7.1.2 Device settings
The measuring equipment is delivered ready for operation
according to your order specifications. The limit
transducers are set to the desired values. If you have
submitted no requirements, the basic setting for
1 contact device: - Minimum contact switching point at 10 %
of descending flow (damped/closed-circuit principle).
2 contact devices: Minimum contact switching point at 10 %
of descending flow and maximum contact switching point at
90 % of ascending flow.
7.1.3 Adjusting the limit transducer
The contacts are adjustable through the contact position
indicators located on the scale. Dismantle the indicator
cover, unfasten the contact position indicators, set to the
desired value and reattach them.

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BGN K01/0908 Page 8
7.1.4 Operation in hazardous areas
7.1.4.1 Without electrical equipment
The basic version of the flowmeter is a non-electrical device
without its own ignition sources and meets DIN EN 13463-1
requirements. It can be used in hazardous areas that
require Category 2 equipment.
Marking: II 2GD c
Reg. No.: BVS 03 ATEX H/B 112
Tech. File Ref. 03-02 X
Since the device does not have its own power sources that
would result in a temperature increase, the fluid temperature
is decisive for the maximum surface temperature.
When used in potentially explosive dust atmospheres, the
device must be cleaned regularly in order to avoid deposits
exceeding 5 mm.
7.1.4.2 With built-in electrical limit transducers
When the limit transducers are installed, the device becomes
an electrical assembly and receives a marking in accordance
with DIN EN 50014 from the entire device with the built-in
electrical limit transducers.
The electrical and thermal data and the special conditions of
the EC Type Examination Certificate of the built-in limit
transducers must be observed (see also the diagram in
Section 7.3.2).
The influence of the fluid temperature on the built-in limit
transducers must be observed. The overtemperature of the
maximum fluid temperature based on the maximum ambient
temperature must be considered with a factor according to
the following table:
Nominal size Factor for
standard
version
Factor for the
device with the
indicator pulled
forward
DN15 and DN25 0.2 0.07
DN40 and DN50 0.25 0.085
DN80 and DN100 0.3 0.1
Example for built-in limit transducer for
DN 15 and DN 25:
Max. ambient temperature Tamb = 40 °C
Max. fluid temperature Tm= 120 °C
Factor for brought-in heat F = 0.2
Temperature class T4
Tü= Overtemperature
Ta= Ambient temperature of
limit transducer
CCCTambFTüTa
CCCTambTmTü
°=°+°=+=
°=°−°=−=
56402,0*80*
8040120
In accordance with the tables in the
PTB 99 ATEX 2219 X EC Type Examination Certificate, the
SJ 3,5-... N... inductive sensor must be operated in the
T5 temperature class with an intrinsically safe circuit that
does not exceed the maximum values of the Type 3 circuit.
When using the device in hazardous areas, follow the
applicable national installation rules.
Example for calculating the max. fluid temperature
based on the max. ambient temperature for the built-in
sensor Type ES for DN 15/25.
Ta= 70 °C
Tamb = 60 °C
F = 0.2
CC
CC
Tamb
F
TambTa
Tm °=°+





°−°
=+





−
=11060
2,0
6070
7.1.4.2.1 Marking for the device when the
SJ 3,5...N... limit transducer is built in
PTB 99 ATEX 2219 X
II 2G EEx ia IIC T6-T4
7.1.4.2.2 Marking for the device when the ES magneto-
electric transmitter is built in
DMT 00 ATEX 075
II2G EEx ia IIC T6
7.1.4.2.3 Marking for the device when the KINAX 3W2
angle-of-rotation transmitter is built in
PTB 97 ATEX 2271
II 2G EEx ia IIC T6
7.1.4.3 Atmospheric conditions
In accordance with EN 1127, a “potentially explosive
atmosphere“ is defined as a mixture of air and combustible
gases, vapour, mist or dust under atmospheric conditions.
Such conditions are defined in EN 13463-1, para. 1, with
values Tatm = -20 °C to +60 °C and Patm = 0.8 to 1.1 bar.
Outside this range, safety parameters for most ignition
sources are not available.
Usually, variable-area flow meters operate under operating
conditions outside the atmospheric conditions of 0.8 to
1.1 bar. Irrespective of the zone classification –safety
parameters of explosion protection – are basically not
applicable to the inside of the measuring tube.
Therefore operation with combustible products is only
allowed if a potentially explosive air mixture is not formed
inside the flow meter. Where this condition is not met, the
operator will need to assess the ignition hazard in each
individual case and give due consideration to existing
parameters (e.g. pressure, temperature, process product,
materials of construction for the measuring tube).
7.1.4.4 Ground connection
In variable-area flow meters, it is possible under operating
conditions for charge separation to occur in the measuring
tube due to the transport of non-conductive fluids and/or
when the flow comes into contact with non-conductive
internals (e.g. liners, floats).
For that reason, variable-area flow meters must be
permanently grounded by the operator by way
of the process connections (flanges) in order to discharge
electrostatic build-up. The operator is also responsible for
extending the ground continuity of the process pipeline.
If grounding cannot be made via the process connections
(plastic process connections or undefined connections), the
flow meter must be connected to the local ground potential
via the flanges. This connection only ensures electrostatic
grounding of the device and does not meet the requirements
for equipotential bonding.

BGN
Page 9 BGN K01/0908
7.2 Ambient conditions
7.2.1 Ambient temperature ranges
Without electrical accessories:
-40 °C to +80 °C
With limit transducer:
-40 °C to +65 °C
With KINAX signal output:
-40 °C to +60 °C
With ES signal output:
-40 °C to +70 °C
For the hazardous area version, take note of the maximum
ambient temperatures depending on the temperature class
as specified in the Type Examination Certificate.
7.2.2 Storage temperature
The storage temperatures are identical to the ambient
temperature ranges.
7.2.3 Climatic category
Weather-protected and/or unheated locations, class C
according to IEC 654 Part 1
7.2.4 Degree of protection
IP 65 (Aluminum indicator unit)
IP 67 (Stainless steel indicator unit)
7.2.5 Shock resistance/vibration resistance
The meter should be protected from extreme shocks and
vibrations, which could cause damage.
7.2.6 Electromagnetic compatibility
EN 61000-6-2:1999 Immunity industrial environment
EN 50081-1 Emitted interference residential environment
EN 55011:1998+A1:1999 Group 1, Class B
NAMUR recommendation NE 21
7.3 Fluid conditions
7.3.1 Fluid temperature ranges
BGN-S/H : - 40 °C to +200 °C
Special design: -80 °C to +350 °C
BGN-P : - 20 °C to +125 °C
7.3.2 Diagrams: Max. ambient temperature based on the fluid temperature for the ES
Standard version
20,0
30,0
40,0
50,0
60,0
70,0
70 80 90 100 110 120 130 140 150 160 170 180 190 200
Fluid temperature [°C]
Max. ambient temperature [°C]
DN15/25 DN40/50 DN80/100

BGN
BGN K01/0908 Page 10
Indicator pulled forward
55,0
60,0
65,0
70,0
70 80 90 100 110 120 130 140 150 160 170 180 190 200
Fluid temperature [°C]
Max. ambient temperature [°C]
DN15/25 DN40/50 DN80/100
7.3.3 Fluid pressure limit
Standard design BGN-S/H – DN 15/25/40/50/80 PN 40;
DN 100 PN 16
Special design – up to PN 400
BGN-P – DN 15/25/50/80/100 PN 16
7.3.4 Inlet and outlet sections
Inlet and outlet sections are not required for a linear flow
profile of the fluid. For an extremely non-linear flow profile
(e.g. shut-off/control valves are located in front of the meter),
we recommend an inlet section with a mounting length of
250 mm (see also guidelines in accordance with
VDI/VDE 3513).
7.3.5 Physical state
Liquid or gaseous
7.3.6 Density
Liquids: up to 2.0 kg/l
Gases: no restrictions
7.3.7 Viscosity
The influence of viscosity depends on various factors.
Therefore, it must be calculated for each application.
7.3.8 Pressure (for gas measurement)
The measured values only apply to the calibrated fluid data
stated on the scale. Any change or deviation in pressure will
cause a display fault.
7.3.9 Pressure loss
Depends on the meter size and the measuring range (see
Measuring range table).

BGN
Page 11 BGN K01/0908
8 Construction details
8.1 Type of construction/dimensions
8.1.1 Aluminum indicator housing
i.d.
Dimensions:
DN PN i.d. A B
Flan
g
eB Ermeto S
15 40 26 74 110 53 150
25 40 32 77 110 58,5 150
40 40 46 88 130 63 150
50 40 70 97 140 77,5 150
80 16 102 113 160 93,5 150
100 16 125 126 175 110 120
8.1.2 Dimension drawing for heating
connection
Deviating mounting dimensions:
* +100 mm with the indicator pulled forward
8.1.2.1 Connections for heating jacket
Pipe for Ermeto 12 mm
Flange in acc. with DIN DN 15 or DN 25 PN 40
Flange in acc. with ANSI ½“ 150 lbs
The DN 25 flange is a special version.

BGN
BGN K01/0908 Page 12
8.1.3 Indicator housing made of stainless
steel
i.d. = inside diameter
i.d.
DN PN Inside diameter A
15 40 26 100
25 40 32 103
40 40 46 110
50 40 70 122
80 16 102 138
100 16 125 151
Deviating mounting dimensions:
* +100 mm with the indicator pulled forward
8.2 Weight
Nominal size Weight [kg]
DN 15 3
DN 25 4.2
DN 40 6
DN 50 7.5
DN 80 13
DN 100 18
Nominal size Weight [kg]
¾“, 150 lbs, ANSI
B16.5
3
1“, 150 lbs, ANSI
B16.5
4.2
1 ½“, 150 lbs, ANSI
B16.5
6
2“, 150 lbs, ANSI
B16.5
7.5
3“, 150 lbs, ANSI
B16.5
13
4“, 150 lbs, ANSI
B16.5
18
Nominal size Weight [kg]
¾“, 300 lbs, ANSI
B16.5
3.4
1“, 300 lbs, ANSI
B16.5
4.7
1 ½“, 300 lbs, ANSI
B16.5
6.8
2“, 300 lbs, ANSI
B16.5
8.5
3“, 300 lbs, ANSI
B16.5
14.5
4“, 300 lbs, ANSI
B16.5
20

BGN
Page 13 BGN K01/0908
8.3 Material
Fitting
Type Measuring tube Lining of
measuring
tube
Flanges Flange lining Float
BGN – S Stainless steel none Stainless steel none Stainless steel
BGN – P Stainless steel PTFE Stainless steel PTFE PTFE
BGN – H DN15/25 ¾“/1“ Hastelloy HC4 none Hastelloy HC4 none Hastelloy HC4
BGN – H > DN40 / 1½” Hastelloy HC4 none Stainless steel Hastelloy HC4 Hastelloy HC4
Indicator
Type Base plate Housing
BGN – S/P/H Aluminum Aluminum, safety glass window
Optional Stainless steel Stainless steel, safety glass window
8.4 Process connection
BGN-S/H BGN-P
DN 15 PN 40 PN 16
DN 25 PN 40 PN 16
DN 40 PN 40 PN 16
DN 50 PN 40 PN 16
DN 80 PN 40 PN 16
DN 100 PN 16 PN 16
BGN S/ H BGN P
ANSI ¾“ B16.5 150 lbs
1)
300 lbs
1)
150 lbs
2)
300 lbs
2)
ANSI 1“ B16.5 150 lbs
1)
300 lbs
1)
150 lbs
2)
300 lbs
2)
ANSI 1 ½“ B16.5 150 lbs
1
)
300 lbs
1)
150 lbs
2)
300 lbs
2)
ANSI 2“ B16.5 150 lbs
1)
300 lbs
1)
150 lbs
2)
300 lbs
2)
ANSI 3“ B16.5 150 lbs
1)
300 lbs
1)
150 lbs
2)
300 lbs
2)
ANSI 4“ B16.5 150 lbs
2)
300 lbs
2)
150 lbs
2)
300 lbs
2)
1) Entire device PN 40 2) Entire device PN 16
Additional equipment: special flanges, union, food connection, welding connection
The S/H versions in special design are available up to PN 400.
8.5 Magnetic filter
The BGN flowmeter is sensitive to impure media. Before
installing the device, clean the pipes of dirt, spatter and other
foreign matter. If the medium comes with solid particles,
connect a suitable filter in series. When dealing with flow
media with ferrous particles, we recommend the connection
of a magnetic filter.
To protect both magnetic filter types, MF-S (stainless steel)
and MF-P/S (PTFE/stainless steel), from corrosion,
encapsulated permanent magnets are laid out in spiral form.
The spiral mounting produces optimum effect at small
pressure loss. The filter can be supplied with groove or
tongue, projection or return, other standards or special
connections according to customer wishes.
Dimensions:
DN g (mm)
15 45
25 68
40 88
50 102
65 122
80 138
100 158

BGN
BGN K01/0908 Page 14
8.6 Electrical connection
Wiring
To connect the auxiliary power, remove the indicator cover, insert the connector cable into the cable gland and attach it to the
terminals according to terminal diagram. Tighten the cable gland securely, remount the indicator cover and close it tightly.
8.6.1 Wiring diagram for ES transmitter (signal output 4-20 mA with HART)
8.6.2 Wiring diagram for ES transmitter with 4-20 mA output and 2 limit transducers

BGN
Page 15 BGN K01/0908
8.6.3 Wiring diagram for ES transmitter with 4- 20 mA output, pulse output and limit transducer
8.6.4 Wiring diagram for inductive limit transducers

BGN
BGN K01/0908 Page 16
8.6.5 Wiring diagram for KINAX 3W2 transmitter with 4-20 mA output, 2 wires
8.6.6 Wiring diagram for KINAX 3W2 transmitter with 4-20 mA output, 3 wires

BGN
Page 17 BGN K01/0908
8.6.7 Wiring diagram for KINAX 3W2 transmitter with 4-20 mA output, 4 wires
8.6.8 Wiring diagram for KEM 1 and KEM 2 double-throw microswitches

BGN
BGN K01/0908 Page 18
9 Indicator unit
- Analog indicator approx. 90° with pointer
- Customized product scale
- ES transmitter with freely programmable user interface
- Parameters may be changed based on the ES
Operating Instructions.
10 Auxiliary power
see Electrical connection
11 CE mark
The measuring system meets the statutory requirements of
the following EU directives: Directive 94/9/EC (Equipment
and Protective Systems for Use in Potentially Explosive
Atmospheres), the Electromagnetic Compatibility (EMC)
Directive 89/336/EEC and the Pressure Equipment Directive
97/23/EC.
Measuring sensors with a connection nominal size equal to
or smaller than or DN 25 fall within the scope of application
of Article 3, section 3, of the Pressure Equipment Directive
and need no CE mark in accordance with this directive.
Kobold Messring confirms compliance with the directives by
attaching the CE mark.
12 Order information
Please include the following information in your order:
Product data, specific weight, temperature, pressure,
viscosity, material design, connection size, measuring range,
desired accessories, required approvals and material
certificates. See Device selection by model code.
12.1 Available accessories
- Stainless steel indicator unit, glass window IP 66
- Indicator unit for high or low temperatures pulled
forward by 100 mm
- Fitting with heating or cooling jacket (with Ermeto or
flange connection)
- Float system with viscous damping
- Float system with gas damping
- Float system with spring stop
- 1 or 2 inductive limit transducers
- KINAX or ES electric transmitter
- Drainable fitting (pump has been disconnected)
- Magnetic filter
13 Standards and directives,
certificates and approvals
- Certified to DIN-EN 9001
- Production in accordance with AD guidelines and HPO
approval (TRB200/TRD201)
- TÜV approval for welding requirements in accordance
with DIN-EN 729-2
- Measuring range rated and converted to other products
according to VDE/VDI guidelines 3513
- Directive 94/9/Ec (Equipment and Protective Systems
for Use in Potentially Explosive Atmospheres)
- EN 50014:1997+A1-A2 - General requirements
- EN 50020:1994 - Intrinsic safety “i”
- Directive 89/336/EEC (EMC Directive)
- EN 61000-6-2:1999 – Immunity industrial environment
- EN 50 081-1 – Emitted interference residential
environment
- EN 55011:1998+A1:1999 – Group 1, Class B
- NAMUR recommendation NE 21
- EN 60529 – Degrees of protection through housing (IP
code)
- EN 61010 – Safety requirements for electrical
measuring, control and laboratory devices
- EN 60947-5-6:2000 – Switchgear and controlgear
- Directive 97/23/EC (Pressure Equipment Directive)
14 Safety instructions
14.1 Intended use
The BGN variable-area flowmeter may be used only for flow
measurements of fluid and gaseous media. The
manufacturer shall not be liable for damages that may result
from unintended or inappropriate use.
When dealing with an aggressive medium, clarify the
material durability of all wetted parts.
When using the device in hazardous areas, follow the
applicable national installation rules.
14.2 Installation, start-up and operating
personnel
Only trained specialists authorized by the system operator
may carry out the installation, electrical installations, start-up,
maintenance and operation. They must read and
understand the operating manual and follow its instructions.
The required mounting, electrical installation, start-up and
maintenance work may only be carried out by expert and
authorized persons designated by the plant operator.
Basically, follow the conditions and provisions applicable in
your country.
15 Packaging, mounting and
shipment
Carefully unpack the device to avoid damaging it. The float
is secured against damage in transit depending on the
device size. Remove this transport protection from the
fitting. By pressing the float from the bottom upwards (using
a wooden stick, for example), check whether the float can
easily be moved upwards and slides back downwards. The
pointer position of the indicator unit must follow the direction
of movement of the float.
With the help of the delivery note enclosed in the packaging,
check whether all technically relevant data coincide with your
requirements.
Storage and installation must be done in a clean and dry
room so that contamination – especially of the interior of the
fitting – is avoided. Follow the limit values for ambient
temperature. When transporting the device to a remote
mounting location, we recommend that you reuse the
factory-issued packaging and the transport protection.
16 Maintenance
The device requires no maintenance if used according to its
intended purpose. However, if cleaning is necessary to
remove dirt from the measuring ring or the float, take note of
the following aspects:
- Please take note that, with devices with built-in
electrical equipment, removing the indicator cover
restricts the EMC protection.
- Before removing a device, make sure that the pipeline
is free from the product, is pressureless and has cooled
down.
- Fittings with the insides coated may be carefully
cleaned after removal with a brush and the appropriate
cleansing agent. Carefully clean the float from possible
coating. Attention: do not use the measuring ring/cone

BGN
Page 19 BGN K01/0908
and float with hard objects (see Removing/installing the
cone/float).
- The switching points of the limit transducers are
adjustable. To do this, remove the indicator cover,
unfasten the contact point indicator located on the scale
and readjust it. After the adjustment, reattach the bolts
of the contact point indicator. Reinstall and tighten the
indicator cover.
- The calibration of the KINAX signal output is firmly set
and not adjustable. Do not adjust the potentiometer of
the transmitter.
- The parameterization of the ES is possible and is done
via HART. Please refer to the separate Operating
Instructions for the ES.
- The gas and viscous damping cylinders can be
checked for dirt (see Installing/removing the damping
sets).
17 Installing and removing cone,
float, damping sets/spring stop
To remove the float (cone/float), detach the device from the
pipe. Then clamp the device horizontally in a vise, making
sure that fitting is not damaged.
Device with measuring ring: By using a suitable tool on
the guide star secure the float from contortion from above in
the fitting, and remove the lower guide star's retaining screw
identifiable from below in the fitting and the guide star. The
float can then be taken out from above.
Device with cone: Unscrew the cone with the float using a
suitable tool through the lower cone thread, and take out the
float after removing the top cone stabilizer.
Important! Avoid damaging the float/measuring ring and
cone. To change the measuring range, the float can be
replaced once the measured variable reaches 5-50 l/h of
water. In S-type devices the cone and float can be replaced
at up to 40 l/h water.
The gas and viscous damping cylinders as well as the spring
stop for the float can be removed from the top after the
device has been removed. Proceed in reverse order when
reinstalling thesed parts.
18 Trouble shooting
- Indicator window clouds over: Water in the indicator
unit.
- Indicator cover is not tight enough: Adjust the cover
seal, tighten the cover.
- Window is opaque: Corrosive atmosphere, ventilate.
- Window ices over due to cold and damp
atmosphere: The device can be equipped at the
factory with an air/nitrogen flush.
- Window ices over due to very cold medium and
damp atmosphere: The device can be equipped at
the factory with a pulled-forward indicator unit.
- Device shows incorrect values: Compare process
data, density, viscosity, temperature and pressure with
the values on the scale. If they deviate, convert the
scale values using the VDE/VDI 3513 standard; for the
signal output 2 option, carry out reparameterization.
- Pointer does not react in spite of varying flow: The
pointer may have gotten stuck; remove the cover and
move the pointer; if the pointer can be moved easily,
the float cannot move. If the pointer is unable to move
further, send the device to the head office for servicing.
- The float is stuck at one place due to dirt:
Disassemble the device. If necessary, dismantle and
clean the float. Install a magnetic filter if there are
magnetic contaminants.
- Float is stuck at one place due to deformation of
the measuring ring and float guide because the
float has been pushed upwards: Send the device to
the head office for servicing, replace the fitting, equip
with additional spring stop.
- Gas/viscous damping sets have gotten stuck due to
dirt: Disassemble the device, pull the gas/viscous
damping cylinder to the top and clean it. If the parts are
damaged or worn, send the device to the head office for
servicing. Install precautionary features such as filters
to protect against dirt.
- Scale pointer pulsates: Increase the supply pressure
when measuring gas. Alternatively, mount an aperture
plate behind the device and check whether the valve is
mounted behind the device. Select the device with the
smallest possible pressure loss. Adjust to the desired
flow rate, run at 100 %. Select a short distance
between the flowmeter and the downstream throttle
point (valve). When dealing with liquids, prevent
pulsation of the product by using a volume receptacle.
If necessary, have Kobold Messring install a viscous
damping set or a double eddy-current damping set.
- Electrical equipment are not functioning: Check the
auxiliary power. Are suitable power supply equipment
connected, have the terminals been selected correctly,
has the parameterization carried out correctly?
19 Returning devices for repair and
service
Note: In accordance with the applicable German waste
disposal legislation, the owner/client is responsible for the
disposal of special waste and hazardous materials.
Consequently, all devices sent to us for repair must be free
of any hazardous materials. This also applies to possible
hollow spaces and fissures in the devices. If repair is
necessary, confirm the above-mentioned item in writing
(please use the form in the Appendix).
If hazardous materials remain in or on the device after it has
been returned, Kobold Messring shall be authorized to
remove them at the client’s expense without further inquiry.
20 Replacement parts
The following parts can be ordered as replacement parts:
1 ) Indicator cover with
window/gasket/screws
2 ) Scale with standard scaling
3 ) Pointer
4 ) Limit value indicator
5 ) Pointer stop
6 ) Float with guides and safety screw
7 ) Spring stop
8 ) Complete gas damping set with float
9 ) Complete viscous damping set with float
10) Screwed cone set with float for
small measuring range up to 40 l/h
11 ) Limit value initiatior

BGN
BGN K01/0908 Page 20
21 Exploded views
21.1 Fitting with measuring element
Name
(Figures 12-15) Part no.
BGN - Fitting 1
BGN - Fitting with Spring stop for float 2
Float 3
Float with damping piston 4
Spring stop 5
gas damping 6
gas damping with Spring stop 7
21.1.1 BGN-.... Standard version
21.1.2 BGN-.... with spring stop
21.1.3 BGN-.... with damping piston
Figure 12
Figure 13
Figure 14