measuring
All-Metal Variable Area •
Flow Meter monitoring
•
for horizontal and vertical mounting analysing
BGF
OO Measuring range:
10 - 100 ... 6000 - 60 000 l/h water
0.3 - 3.0 ... 170 - 1700 m³/h air
(20 °C, 1.013 bar)
OO Accuracy: ± 2% of full scale
S2
OO pmax: PN 40 (option: PN 400);
tmax: -40 ... +200 °C
OO Connection: flange
DN 15 ... DN 80, ANSI ½" ... 3"
OO aterial: stainless steel
M
1.4404/1.4571, PTFE
Special OO Options:
versions up to Contacts, analogue output
600 bar with HART®, Profibus®-PA,
Foundation™ Fieldbus®
KOBOLD companies worldwide: KOBOLD Messring GmbH
Nordring 22-24
AUSTRALIA, AUSTRIA, BELGIUM, BULGARIA, CANADA, CHINA, CZECHIA, FRANCE, GERMANY, D-65719 Hofheim/Ts.
GREAT BRITAIN, HUNGARY, INDIA, INDONESIA, ITALY, MALAYSIA, MEXICO, NETHERLANDS, Head Office:
PERU, POLAND, Republic of Korea, SPAIN, SWITZERLAND, THAILAND, TUNISIA, turkey, +49(0)6192 299-0
+49(0)6192 23398
USA, VIETNAM info.de@kobold.com
1/12 - 2024
www.kobold.com
1
All-Metal Variable Area Flow Meter Model BGF
Technical Details
Fitting
Wetted parts:
Measuring tube st. st.: 1.4404 (316 L) / 1.4571 (316 Ti),
spring st. st. 1.4571
Measuring tube PTFE: PTFE, spring Hastelloy® C-22,
special materials on request
Process connection: flanges acc. to EN 1092-1
ASME B16.5, DIN 2512,
JIS, NPT, screw pipe,
connection, special connections
on request
Nominal pressure: PN 40, ASME Cl150 / 300
(standard) (BGF-S)
Description
PN 16, ASME Cl150
Inside the flow tube, there is a star guided float which works
(standard) (BGF-P)
towards a spring. An annular gap is produced between
the cone-shaped magnet system and the meter ring in higher pressure rates on request
case of flows other than zero. The position of the magnet (max. 400 bar)
system depends on the resulting force of all forces acting Process temperature: -40 °C ... +150 °C
upon it. These forces comprise the flow force, a spring (BGF-S with electrical output)
force acting opposite to the flow force, and the buoyancy -40 °C ... +200 °C
and weight force significant for the measurements in case (BGF-S without electrical output)
of vertical installation. Each position of the magnet holder -40 °C ... +200 °C
corresponds to a flow value measured during calibration, (BGF-S with option V / H / W)
which is transferred to a scale. The BGF flow meter consists
-40 °C ... +125 °C (BGF-P)
of a meter tube with connections, a meter ring, and a conical
magnet holder. By means of a magnet, the position of the Ambient temperature: -40 °C ... +80 °C
magnet system is transferred to an encapsulated follow Accuracy
magnet, which has been fitted to a pointer axle. The position
Liquid/gas: ± 2 % of full scale
of a second annular follow magnet fitted on the pointer axle is
transferred to the scale by means of the pointer. Additional inaccuracy
by transmitter (ES): ± 0.2 %
Repeatability: ± 0.8 % of full scale
Application
The BGF meter is suitable for flow measurement of liquid or Certificate and accreditation
gaseous products in pipes. The special advantage is that it BGF (mechanical device): HMT21-4111X
can be used for all directions of flow. It shows the current flow (Conformity statement)
rate in volume or mass per unit in time. Ex marking: II 2G Ex h IIC T1…T6 Gb
II 2D Ex h IIIC T85°C/T350°C Db
Areas of Application Advertisement
Flow measurement, monitoring, adjusting and control of liquid Material: aluminium (stove-enameled)
and gaseous products. The meter’s design makes it ideal for stainless steel (optional)
processes under difficult and adverse operating conditions. Electr. outputs: inductive switch
The devices are available with additional electrical equipment (standard)
for process monitoring and control. inductive switch (safety design)
max. 2 micro changeover
OO A large spectrum of wetted materials switches
OO Magneto-resistive signal transmission (Reed switch Umax: 175 VDC,
OO Special design for high-pressure Imax: 0.25 A, pmax: 5 W)
and high-temperature applications others on request
OO Excellent heat tracing technology (as option)
OO Double eddy current damping (as option)
1/12 - 2024
2 www.kobold.com No responsibility taken for errors;
subject to change without prior notice.
All-Metal Variable Area Flow Meter Model BGF
Technical Details (continued)
Ambient temperature:
-40 °C ... +80 °C
(without switch)
-40 °C ... +65 °C
(with switch)
Protection: IP 65 (Aluminium housing)
IP 65, IP 66, IP 67 (Stainless steel
housing)
Transmitter
•• ES with HART®-protocol
•• ES with HART®-protocol and
2 NAMUR-switches
•• ES with HART®-protocol and
1 NAMUR-switch / 1 pulse output
•• ES with Profibus-PA®
Power supply: 14 - 30 VDC
Outputs: passive, galvanically isolated
Currency: 4-20 mA
Binary 1 and 2: Ui =30 V, Ii =20 mA, Pi = 100 mW
Ambient temperature: -40 °C ... +70 °C
Certification and accreditation
ATEX (IECEx) Directive:
ES: DMT 00 ATEX E 075 /
IECEx BVS 16.0072
Ex marking: II 2G Ex ia IIC T6 Gb
SJ 3,5-N: PTB 99 ATEX 2219X
SJ 3,5-SN: PTB 00 ATEX 2049X
Ex marking: II 2G Ex ia IIC T6…T1 Gb
II 1D Ex ia IIIC T200 135°C Da
KCS (Korea):
ES: 19-KA4BO-0315
Ex marking: Ex ia IIC T6
NEPSI (China):
ES: GYJ22.1875
Ex marking: Ex ia IIC T6 Gb
PESO (India):
ES: P568580
Ex marking: Ex ia IIC T6 Gb
Additional options
•• Other materials
•• Other flange versions and sizes
•• Certifications and certificates
•• Display with pressure compensations
against condensate build up
•• Micro changeover switches
•• Inductive switches in safety design
1/12 - 2024
No responsibility taken for errors; www.kobold.com 3
subject to change without prior notice.
All-Metal Variable Area Flow Meter Model BGF
Order Details (example: BGF-S 15 305B H K O 0 0 S 1 0 0K)
Model Measuring Measuring Connection Pressure Max. Code 1) Code 1)
range water at range air at size stage pressure loss flange flange
1000 kg/m3, 20 °C, DN (ASME) [mbar] DIN EN 1092-1 ASME
1 mPas 1013 mbar Form B1 Class 150 RF
[l/h] [Nm3/h] 2)
10 - 100 0.3 - 3.0 DN 15 (¾") PN 40/150 lbs on request 15 305B H 15 202R H
16 - 160 0.5 - 4.6 DN 15 (¾") PN 40/150 lbs 110 15 305B I 15 202R I
25 - 250 0.7 - 7.0 DN 15 (¾") PN 40/150 lbs 110 15 305B J 15 202R J
40 - 400 1.0 - 11 DN 15 (¾") PN 40/150 lbs 110 15 305B K 15 202R K
60 - 600 1.7 - 17 DN 15 (¾") PN 40/150 lbs 120 15 305B L 15 202R L
100 - 1000 3.0 - 30 DN 25 (1") PN 40/150 lbs 90 15 309B M 15 203R M
160 - 1600 4.0 - 46 DN 25 (1") PN 40/150 lbs 105 15 309B N 15 203R N
BGF-S = 250 - 2500 7.0 - 70 DN 25 (1") PN 40/150 lbs 130 15 309B P 15 203R P
stainless steel 400 - 4000 11 - 110 DN 25 (1") PN 40/150 lbs 240 15 309B Q 15 203R Q
meas. tube, 100 - 1000 3.0 - 30 DN 25 (1") PN 40/150 lbs 90 25 309B M 25 203R M
st. st. spring,
160 - 1600 4.0 - 46 DN 25 (1") PN 40/150 lbs 105 25 309B N 25 203R N
up to 200 °C
250 - 2500 7.0 - 70 DN 25 (1") PN 40/150 lbs 130 25 309B P 25 203R P
400 - 4000 11 - 110 DN 25 (1") PN 40/150 lbs 240 25 309B Q 25 203R Q
BGF-P = 250 - 2500 7.0 - 70 DN 40 (1 ½") PN 40/150 lbs 75 40 317B P 40 205R P
st. st. meas. 400 - 4000 11 - 110 DN 40 (1 ½") PN 40/150 lbs 110 40 317B Q 40 205R Q
tube with
600 - 6000 17 - 170 DN 40 (1 ½") PN 40/150 lbs 130 40 317B R 40 205R R
PTFE lining,
Hastelloy® 1000 - 10 000 29 - 290 DN 40 (1 ½") PN 40/150 lbs - 40 317B S 40 205R S
spring, 400 - 4000 11 - 110 DN 50 (2") PN 40/150 lbs 100 50 321B Q 50 206R Q
up to 125 °C 600 - 6000 17 - 170 DN 50 (2") PN 40/150 lbs 110 50 321B R 50 206R R
1000 - 10 000 29 - 290 DN 50 (2") PN 40/150 lbs 120 50 321B S 50 206R S
1600 - 16 000 46 - 460 DN 50 (2") PN 40/150 lbs 130 50 321B T 50 206R T
2500 - 25 000 70 - 700 DN 50 (2") PN 40/150 lbs 200 50 321B U 50 206R U
1600 - 16 000 46 - 460 DN 80 (3") PN 40/150 lbs 110 80 331B T 80 208R T
2500 - 25 000 70 - 700 DN 80 (3") PN 40/150 lbs 130 80 331B U 80 208R U
4000 - 40 000 110 - 1100 DN 80 (3") PN 40/150 lbs 200 80 331B V 80 208R V
6000 - 60 000 170 - 1700 DN 80 (3") PN 40/150 lbs - 80 331B W 80 208R W
Reference conditions: water 20 °C, air 1.013 bar abs.
1)
Other flange connections: Form C, N, D, JIS or Class 300 on request
2)
For gas measurements a factor of 2-3 of the inlet pressure should be considered
1/12 - 2024
4 www.kobold.com No responsibility taken for errors;
subject to change without prior notice.
All-Metal Variable Area Flow Meter Model BGF
Continuation Order Details for Liquids (example: BGF-S 15 305B H K O 0 0 S 1 0 0K)
Magnet bearer Flow Heating1) / Certificates Display Scale Electrical Accessories
direction Cooling output
S = aluminium,
up to 150 °C 0 = without
for electrical 1 =1 inductive switch
2 = 2 inductive
output, switches
0 = without up to 200 °C 3 = 1 inductive
certificate for local switch (safety
indication design) 2) 4) 5)
4 = 2 inductive
1 = certificate of V = aluminium, switches (safety
compliance assembled Water design) 2) 4) 5)
with the at distance, 1 = %-scale L = 1 x micro change
0 = without over switch
order 2.1 up to 200 °C M = 2 x micro change
2 = measuring
range over switches
E = st. steel, 6 = transmitter ES
O = top to 1 = with heating 2 = certificate of up to 150 °C
ermeto 12 with HART®, Ex ia,
bottom compliance 4-20 mA 2) 3) 5)
K = PP 1) mm F=d
ouble
with the H = st. steel, 7 = transmitter ES 0K = without
(to 80 °C, assembled scale (acc. with HART®,
order 2.2
from DN 50) L = left customer Ex ia, 4-20 mA SK = SIL
2 = with heating at distance,
to right preference) and 2 Namur- Conformity
DIN-flange up to 200 °C switches 2) 3) 5) assessment by
P = PTFE DN 15 / PN40 B = inspection 8 = transmitter ES EXIDA 6)
certificate T = aluminium, with HART®,
(81 ... 125 °C) R = right with Media Ex ia, 4-20 mA,
with materi- XK = special
to left pressure 1 Namur switch
3 = with heating al certificate 4 = %-scale (separate
compens and 1 pulse
ANSI-flange 3.1 5 = measuring output 2) 3) 5) specification)
S = st. steel 1)
½" Class ation, 9 = electrical
U = bottom range
150 up to 150 °C transmitter ES
to top
C = inspection for electrical with Profibus®-PA,
4 = with heating certificate output, Ex ia
NPT-flange Please specify
with materi- up to 200 °C E = 1 inductive switch
½" mediadata in (three-wire)
al certificate for local plain text (see F = 2 inductive
3.2 indication below) switches
(three‑wire)
W = aluminium, G = 1 inductive switch
N = material with NCB2-12GM40-
certificate pressure Z0
NACE compens K = electrical
ation, transmitters ES
with Foundation™
assembled Fieldbus®
at distance, X = special
up to 200 °C
1)
Not for model BGF-P (PTFE-coating)
2)
SIL 1 - IEC 61508-2:2010 conformity examined by EXIDA
3)
SIL 1 - IEC 61508-2:2000 conformity examined by EXIDA
4)
SIL 2 - IEC 61508-2:2000 conformity examined by EXIDA
5)
SIL conformity only with "Accessories" option "SK"
6)
Only in combination with "electrical output" for options "3", "4", "6", "7", "8"
For the right design of the flowmeter we need the following data:
measuring range with unit, measured media, process temperature and pressure, viscosity,
operating density (liquids), norm density (gases), mechanical connection.
Dimensions [mm]
DN PN I. W. A (aluminium) A (stainless steel)
15 40 26 74 100
25 40 32 77 103
40 40 46 85 110
50 40 70 98 123
80 40 102 114 140
Dimensional deviations:
+100 mm with forward advanced display
1/12 - 2024
No responsibility taken for errors; www.kobold.com 5
subject to change without prior notice.
All-Metal Variable Area Flow Meter Model BGF
250
155
Dimensions [mm]
155
Display: aluminium
145*
A 70
153
A
250
250
155
47,4
Ø 19 6
250
155 Øl.W.
145*
70
Display: stainless steel 158*
81
153
A
250
47,4
153
Ø 19 6
250
250
Øl.W.
68
Øl.W.
158*
* +100 mm with forward advanced display
81
153
250
68
1/12 - 2024
6 www.kobold.com No responsibility taken for errors;
subject to change without prior notice.
Øl.W.
