Operating Instructions
KRAL Flowmeter.
OMG Series
OIO 14en
Edition 07/2017
Original instructions
www.kral.at
Table of contents
About this document
□ General information 3
□ Target groups 3
□ Symbols 3
□ Danger levels 3
□ Associated documents 4
Safety
□ Proper use 5
□ Safety information 5
Labelling
□ Type code 6
□ Rating plate 7
Technical data
□ Operational limits 8
▪ Load due to pressure pulsation 8
▪ Maximum values 8
KRAL Flowmeter – OMG Series
▪ Substitute operating data 10
□ Sound pressure level 10
□ Dimensions and weights 10
▪ OMG with BSPP thread 10
▪ OMG with DIN flange 11
□ Load-bearing capacity 12
▪ Load-bearing capacity OMG 13 12
▪ Load-bearing capacity OMG 20 13
▪ Load-bearing capacity OMG 32 14
▪ Load-bearing capacity OMG 52 15
▪ Load-bearing capacity OMG 68 16
▪ Load-bearing capacity OMG100 17
▪ Load-bearing capacity OMG140 18
Heating system
□ Electric heating system 19
□ Fluid heating system 20
□ Trace heating system 20
Function description
□ Description 21
□ Roller bearings 22
□ Signal generation 22
□ Linearization 22
□ Temperature compensation 23
□ Flow direction detection 23
□ Junction box 23
Transportation, storage and disposal
□ Unpacking and checking the state of
delivery 24
□ Lifting the flowmeter 24
□ Storage 24
□ Preservation 25
▪ Preserving the flowmeter 25
▪ Removing the preservation 25
□ Disposal 26
□ Installing the flowmeter 27
▪ Installation types 27
▪ Preferred installation variant 28
▪ Recommendations for alternative
installation variants 28
▪ Protect the flowmeter against soiling 29
▪ Connecting the flowmeter to the pipe
system 29
□ Electrical connection 30
▪ Safety instructions for electrical
installation 30
▪ Connection for the pick ups 30
□ Removing the flowmeter 30
Operation
□ Commissioning 32
▪ Cleaning the pipe system 32
▪ Checking the function 32
▪ Commissioning the flowmeter 32
□ Switching off the flowmeter 33
▪ Safety instruction for switching off the
flowmeter 33
▪ Switching off the flowmeter 33
□ Recommissioning the flowmeter 33
Maintenance
□ Safety instructions on maintenance 34
□ Required maintenance 34
□ Re-calibration of the flowmeters 34
□ Mounting instructions OMG 13 35
▪ Removing seals and bearings 35
▪ Installing seals and bearings 36
□ Mounting instructions OMG 20/32 37
▪ Removing seals and bearings 37
▪ Installing seals and bearings 38
□ Mounting instructions OMG 52/68 39
▪ Removing seals and bearings 39
▪ Installing seals and bearings 41
□ Mounting instructions OMG100/140 42
▪ Removing seals and bearings 42
▪ Installing seals and bearings 43
Troubleshooting
□ Possible faults 44
□ Troubleshooting 44
Appendix
□ General drawings 46
□ Parts list 50
□ Accessories 51
▪ Junction box 51
▪ Mounting and connecting the
junction box 52
▪ Connecting the extension cable 53
□ Tightening torques 53
□ Contents of the EC Declaration of
Conformity 54
□ Notes 55
Installation, removal and connection
□ Safety instructions for installation and
removal 27
2 OIO 14en Edition 07/2017 Operating Instructions
General information
About this document
General information
The operating instructions form part of the KRAL Flowmeter and must be kept for future reference.
Furthermore please observe the associated documents.
Target groups
Target group Tasks
Operator-owner □ Keep these instructions available at the site of use for future
reference.
□ Ensure that employees read and observe these instructions and the
associated documents, in particular the safety instructions and
warnings.
□ Observe additional system-specific directives and regulations.
Specialist personnel, fitters □ Read, observe and follow these instructions and the associated
documents, in particular the safety instructions and warnings.
Symbols
Symbol Meaning
Warning personal injury
About this document
Notice
Action steps mechanical installation
Action steps electrical installation
Check or fault table
Request for action
Danger levels
Warning Danger level Consequences of non-observance
Danger Immediate threat of danger Serious personal injury, death
Warning Possible threat of danger Serious personal injury, invalidity
Caution Potentially dangerous situation Slight personal injury
Caution Potentially dangerous situation Material damage
Operating Instructions OIO 14en Edition 07/2017 3
Associated documents
Associated documents
Calibration certificate
Declaration of conformity according to EU Directive 2006/42/EC
Manufacturer's declaration as per EU Directive 2014/34/EU
ATEX supplementary instructions for operation in areas at risk of explosions
Manufacturer's declaration as per EU Directive 2014/68/EU
Corresponding operating instructions for pick ups
About this document
Corresponding operating instructions for temperature sensor
Corresponding operating instructions for electronic equipment
4 OIO 14en Edition 07/2017 Operating Instructions
Proper use
Safety
Proper use
□ Use flowmeters of the OMG series solely for flow measurement of lubricating liquids that are
chemically neutral and do not contain any gas or solids content.
Safety
□ Flowmeters require the operation with clean liquids. If coarse soiling, solid particles in the liquid or
abrasive fine particles occur during operation, the flowmeter has to be protected additionally by a
correspondingly dimensioned operating filter in the pipe system, see "Cleaning the pipe system",
page 32.
□ Only use flowmeters within the operational limits specified on the rating plate and in the "Technical
data" section. Deviating operating data can result in damage to the flowmeter. In the case of
operating data that does not agree with the specifications on the rating plate, please contact the
manufacturer.
□ Strong changes to the flow rate (e.g. rapid shutdown, pulsations ...) cause marked pressure
differences on the flowmeter and can damage the measuring unit.
▪ The pressure loss of the flowmeter must not exceed the values given in the chapter "Technical
data", see "Load-bearing capacity", page 12.
Safety information
The following safety instructions must be observed:
□ No liability is accepted for damage arising through non-observance of the operating
instructions.
▪ Read the operating instructions carefully and observe them.
▪ The operator-owner is responsible for the observance of the operating instructions.
▪ Installation, removal and installation work may only be carried out by specialist personnel.
□ Flowmeters wear to different degrees depending on the respective operating conditions
(pulsations, temperature, …).
▪ Do not continue to use flowmeters that are operated contrary to specifications or after damage.
▪ Check the flowmeters regularly.
▪ Shut down damaged flowmeters and replace worn flowmeters immediately.
□ In order for the warranty to remain valid, corrective maintenance carried out during the
warranty period requires the express permission of the manufacturer.
□ Observe the general regulations for the prevention of accidents as well as the local safety
and operating instructions.
□ Observe the valid national and international standards and specifications of the installation
location.
□ In case of systems with an increased potential of danger to humans and/or machines the
failure of a flowmeter may not lead to injuries or damage to property.
▪ Always equip systems with an increased potential of danger with alarm equipment and/or
bypass.
▪ Maintain and check the protective/alarm equipment regularly.
□ The pumped liquids can be dangerous (e.g. hot, dangerous to health, poisonous,
combustible). Observe the safety conditions for handling dangerous materials.
□ Pumped liquids can be subject to pressure and can cause damage and/or personal injury
should leaks occur.
Operating Instructions OIO 14en Edition 07/2017 5
Type code
Labelling
Labelling
Type code
1 Series
6
2
4
OMG-020.CABABA.0001
1
Fig. 1 Type code
Item Designation Description
1 Series OMG: Universal
2 Size Corresponds to the diameter of the measuring screw large in [mm]
3 Sensor technology B: BEG 43
4 Function of sensor
technology
5 Material of bearing A: Steel
6 Material of seal A: FPM (FKM)
7 Mechanical
connection
3
5
C: BEG 44
D: BEG 45
E: BEG 45 + BEV 13
F: BEG 47
G: BEG 53
H: BEG 54
X: Special design
A: Without flow direction detection
B: With flow direction detection
C: Without flow direction detection, with temperature compensation
D: With flow direction detection, with temperature compensation
X: Special design
B: Hybrid
X: Special design
B: FFPM
C: Low temperature FPM
D: EPDM
X: Special design
A: Pipe thread connection BSPP
B: Flange connection DIN
C: Pipe thread connection NPT
D: Flange connection ANSI
E: Flange connection JIS
F: Flange connection SAE
X: Special design
8
7
9
2 Size
3 Sensor technology
4 Function of sensor technology
5 Material of bearing
6 Material of seal
7 Mechanical connection
8 Electrical connection
9 Version index
6 OIO 14en Edition 07/2017 Operating Instructions
Rating plate
R
1
2
3
4
5
6
7
Item Designation Description
8 Electrical
connection
9 Version index For internal administration
A: Loose cable head
B: Cable gland junction box
X: Special design
Rating plate
Fig. 2 Rating plate
Labelling
1 Serial number
2 Construction year
3 K-factor
4 Preferred flow direction
5 Maximum temperature
6 Type
7 Maximum pressure
Operating Instructions OIO 14en Edition 07/2017 7
Operational limits
10 3020 40 t [ms]
30
10
20
0
p
[bar]
Technical data
Operational limits
The values specified on the rating plate and the calibration certificate apply. The permissible operational
limits of individual values influence each other so that every application is checked individually by the
manufacturer when selecting the flowmeter.
If no operating data are provided by the orderer, standardized substitute operating data are used.
Technical data
Load due to pressure pulsation
Fig. 1 Pressure pulses
Maximum values
The following table shows the respective maximum values that, however, may not occur simultaneously.
In addition, the operational limits of the corresponding end connection, of the sealing material of the pick
up and of the temperature sensor are to be observed.
Strong pressure pulses in the system can reduce the lifetime of
the flowmeter.
OMG 13 OMG 20 OMG 32 OMG 52 OMG 68 OMG100 OMG140
Flow rate
Q
max
Q
nom
Q
min
[l/min] 15 45 150 525 1050 3000 7500
10 30 100 350 700 2000 5000
0.1 0.3 1 3.5 7 20 50
Pressure max. [bar] 250 160 100 40
Temperature
min.–max. [° C] -20...+200
Viscosity
min.–max. [mm2/s] 1 – 1000 000
Measuring
chamber
[ml/U] 1.64 6.25 25.6 112.7 251.3 833.3 2259.9
volume
Rotation speed
n (Q
n (Q
n (Q
) [min-1] 9120 7200 5850 4658 4182 3600 3 318
max
) 6090 4800 3900 3105 2784 2400 2 214
nom
) 61 48 39 31 28 24 22
min
Tab. 1 Maximum values
K1 OMG 13 OMG 20 OMG 32 OMG 52 OMG 68 OMG100 OMG140
Pole number 2 4 6 8 10 14 20
K-factor [P/l] 1216 640 234 71.0 39.8 16.8 8.85
Milliliters/pulse [ml/P] 0.822 1.56 4.27 14.08 25.13 59.52 112.99
Pulse frequency
f1 (Q
f1 (Q
f1 (Q
Tab. 2 Additional maximum values when BEG 43D is used
) [Hz] 304 480 585 621 697 840 1106
max
) 203 320 390 414 464 560 738
nom
) 2.0 3.2 3.9 4.1 4.6 5.6 7.4
min
8 OIO 14en Edition 07/2017 Operating Instructions
K2 OMG 13 OMG 20 OMG 32 OMG 52 OMG 68 OMG100 OMG140
Pole number 4 8 12 16 20 28 40
K-factor [P/l] 2432 1280 468 142 79.6 33.6 17.7
Milliliters/pulse [ml/P] 0.411 0.782 2.14 7.04 12.56 29.76 56.50
Pulse frequency
f2 (Q
f2 (Q
f2 (Q
) [Hz] 608 960 1170 1243 1393 1680 2213
max
) 405 640 780 828 929 1 120 1 475
nom
) 4.1 6.4 7.8 8.3 9.3 11.2 14.8
min
Tab. 3 Additional maximum values when BEG 44 is used
K3 OMG 13 OMG 20 OMG 32 OMG 52 OMG 68 OMG100 OMG140
Pole number 12 16 26 34 42 48 50
K-factor [P/l] 7296 2560 1014 302 167 57.6 22.1
Milliliters/pulse [ml/P] 0.137 0.391 0.99 3.31 5.98 17.36 45.20
Pulse frequency
f3 (Q
f3 (Q
f3 (Q
) [Hz] 1824 1920 2535 2640 2927 2880 2763
max
) 1216 1280 1690 1760 1949 1920 1842
nom
) 12.2 12.8 16.9 17.6 19.5 19.2 18.4
min
Observe the flow range: If the value lies below Q
, refer to the
min
operating instructions of the corresponding pick-up
Technical data
Tab. 4 Additional maximum values when BEG 45 is used
K1 OMG 13 OMG 20 OMG 32 OMG 52 OMG 68 OMG100 OMG140
Pole number 2 4 6 8 10 14 20
K-factor [P/l] 1216 640 234 71.0 39.8 16.8 8.85
Milliliters/pulse [ml/P] 0.822 1.56 4.27 14.08 25.13 59.52 112.99
Pulse frequency
f1 (Q
f1 (Q
f1 (Q
) [Hz] 304 480 585 621 697 840 1106
max
) 203 320 390 414 464 560 738
nom
) 2.0 3.2 3.9 4.1 4.6 5.6 7.4
min
Tab. 5 Additional maximum values when BEG 47D is used
K4 OMG 13 OMG 20 OMG 32 OMG 52 OMG 68 OMG100 OMG140
Pole number 12 16 26 34 42 73 102
K-factor [P/l] 7296 2560 1014 302 167 87.6 45.1
Milliliters/pulse [ml/P] 0.137 0.391 0.986 3.311 5.988 11.416 22.173
Pulse frequency
f4 (Q
f4 (Q
f4 (Q
) [Hz] 1824 1920 2535 2643 2923 4380 5638
max
) 1216 1280 1690 1762 1948 2920 3 758
nom
) 12.2 12.8 16.9 17.6 19.5 29.2 37.6
min
Tab. 6 Additional maximum values when BEG 53A or BEG 54A is used
Operating Instructions OIO 14en Edition 07/2017 9
Sound pressure level
L1
L2
D
G
M18x1
G1/4"
T T
Substitute operating data
The following table shows standardized values for the flow rate, temperature and viscosity. These
values can be used at the same time as maximum values without impairing the service life of the
flowmeter. In addition, the operational limits of the corresponding end connection, of the sealing material
of the pick up and of the temperature sensor are to be observed.
Technical data
Flow rate
Q
max
Q
nom
Q
min
Pressure max. [bar] 250 160 100 40
Temperature
min.–max. [° C] -20...+120
Viscosity
min.–max. [mm2/s] 1 – 200
Tab. 7 Substitute operating data
Sound pressure level
The sound pressure level of the flowmeter amounts to less than 70 dB(A).
Dimensions and weights
OMG with BSPP thread
OMG 13 OMG 20 OMG 32 OMG 52 OMG 68 OMG100 OMG140
[l/min] 10 30 100 350 700 2000 5 000
10 30 100 350 700 2000 5 000
0.2 0.6 2 7 14 40 100
G
M18x1
G1/4"
D
L1
L2
T
Fig. 2 Dimensioned drawing OMG with pipe thread
OMG 13 OMG 20 OMG 32 OMG 52 OMG 68 OMG100 OMG140
G [inch] 1/2 3/4 1 1 1/2 2 4 6
Pressure
stage
D [mm] 90 74 104 118 138 188 267
L1 [mm] 145 145 215 295 355 480 645
L2 [mm] 94 145 215 240 295 400 537
T [mm] 16 16 18 27.5 30 40 54
Weight [kg] 4.6 4.1 11 18 29 70 180
Tab. 8 Dimensions and weights – pipe thread connection
[bar] 250 250 250 160 100 40 40
Pipe thread
Pick up hole
Temperature sensor
hole
Outer diameter
Total length
Flowmeter length
without connections
Screw-in depth max.
10 OIO 14en Edition 07/2017 Operating Instructions
Dimensions and weights
L3
D
TK
G1/4"
DN
M18x1
L3 L2
L1
OMG with DIN flange
DN
M18x1
G1/4"
D
L1
L2
L3
TK
Fig. 3 Dimensioned drawing OMG with DIN flange
OMG 13 OMG 20 OMG 32
DN 15 15 15 20 15 15 32 25 25
Pressure
stage
D [mm] 95 105 130 105 105 130 140 140 150
L1 [mm] 145 145 145 185 185 195 265 265 275
L2 [mm] 94 94 94 145 145 145 215 215 215
L3 [mm] 25.5* 25.5* 25.5 20 20 25 25 25 30
TK [mm] 65 75 90 75 75 90 100 100 105
Weight [kg] 4.7 4.8 6.0 6.0 6.0 8.1 16 16 19
[bar] 40 160 250 40 160 250 40 160 250
Nominal diameter
flange
Pick up hole
Temperature sensor
hole
Outer diameter
Total length
Flowmeter length
without connections
Flange thickness
Pitch circle
Technical data
* Screw-in depth is not equal to L3, but rather amounts to 17 mm
OMG 52 OMG 68 OMG100 OMG140
DN 40 40 50 50 100 100 150 150
Pressure
stage
D [mm] 150 170 165 195 220 235 285 300
L1 [mm] 285 295 340 355 450 460 600 610
L2 [mm] 240 240 295 295 400 400 537 537
L3 [mm] 22.5 27.5 22.5 30 25 30 31.5 36.5
TK [mm] 110 125 125 145 180 190 240 250
Weight [kg] 21 23 31 37 65 70 170 180
Tab. 9 Dimensions and weights – DIN flange connection
[bar] 40 160 40 100 16 40 16 40
Operating Instructions OIO 14en Edition 07/2017 11
Load-bearing capacity
20
18
16
14
12
2
4
6
8
10
0
A
B
1000 h
30000 h
10000 h
5000 h
100000
5
10
50
200
500
1000
2000
5000
10000
50000
100
[mm
2
/s]
C
[bar]
[bar]
C
2
3
0
1
100000
5000
10000
50000
5
10
50
200
500
1000
2000
100
[mm
2
/s]
2
34
109
8
7
65
0,1
1
15
14
13
12
11
E
D
[l/min]
100 50
150
D
[l/min]
50
45
40
30
25
20
1510
51
35
3,5 2,5
1,50,5
0,1
4,5
5
1 2 3
4
[%]
[%]
1
Load-bearing capacity
Load-bearing capacity OMG 13
Technical data
A Short-time operation
12 OIO 14en Edition 07/2017 Operating Instructions
B Continuous operation
C Pressure loss
D Flow rate
E Q
nom
The values apply for lubricating liquids at temperatures of up to 120 °C. Abrasive and aggressive liquids
reduce the durability.
Load-bearing capacity
20
18
16
14
12
2
4
6
8
10
0
A
B
1000 h
30000 h
10000 h
5000 h
100000
5
10
50
200
500
1000
2000
5000
10000
50000
100
[mm
2
/s]
C
[bar]
[bar]
C
2
3
0
1
100000
5000
10000
50000
5
10
50
200
500
1000
2000
100
[mm
2
/s]
6
912
3027
24
21
1815
0,3
3
45
42
39
36
33
E
D
[l/min]
100 50
150
D
[l/min]
50
45
40
30
25
20
1510
51
35
10,5 7,5
4,51,5
0,3
13,5
15
3 6 9
12
[%]
[%]
1
Load-bearing capacity OMG 20
Technical data
A Short-time operation
B Continuous operation
C Pressure loss
D Flow rate
E Q
nom
The values apply for lubricating liquids at temperatures of up to 120 °C. Abrasive and aggressive liquids
reduce the durability.
Operating Instructions OIO 14en Edition 07/2017 13
Load-bearing capacity
Load-bearing capacity OMG 32
Technical data
C
[bar]
D
20
18
16
14
12
10
8
6
4
2
0
[l/min]
[%]
100000
50000
1
1
2
/s]
1000 h
5000 h
10000 h
30000 h
140
150
150
[mm
1000
500
200
100
50
10
5
20
5000
30 40
6050
10000
B
10
2000
A
E
70
80
10090
100 50
110
120
130
100000
50000
10000
5000
3
2
C
1
[bar]
0
D
[l/min]
[%]
1
51
2000
10 20 30
155
1510
20
25
1000
40
35 25
30
35
45
40
45
2
[mm
/s]
500
200
100
50
10
5
50
50
A Short-time operation
B Continuous operation
C Pressure loss
D Flow rate
E Q
nom
The values apply for lubricating liquids at temperatures of up to 120 °C. Abrasive and aggressive liquids
reduce the durability.
14 OIO 14en Edition 07/2017 Operating Instructions
Load-bearing capacity
20
18
16
14
12
2
4
6
8
10
0
A
B
1000 h
30000 h
10000 h
5000 h
100000
5
10
50
200
500
1000
2000
5000
10000
50000
100
[mm
2
/s]
C
[bar]
[bar]
C
2
3
0
1
100000
5000
10000
50000
5
10
50
200
500
1000
2000
100
[mm
2
/s]
70
105 140
350315
280
245
210175
3,5
35
525
490
455
420
385
E
D
[l/min]
100 50
150
D
[l/min]
50
45
40
30
25
20
1510
51
35
122,5 87,5
52,517,5
3,5
157,5
175
35 70 105
140
[%]
[%]
1
Load-bearing capacity OMG 52
Technical data
A Short-time operation
B Continuous operation
C Pressure loss
D Flow rate
E Q
nom
The values apply for lubricating liquids at temperatures of up to 120 °C. Abrasive and aggressive liquids
reduce the durability.
Operating Instructions OIO 14en Edition 07/2017 15
Load-bearing capacity
Load-bearing capacity OMG 68
Technical data
C
[bar]
D
20
18
16
14
12
10
8
6
4
2
0
[l/min]
[%]
100000
50000
7
1
70
10000
B
140
5000
210 280
2
/s]
1000 h
5000 h
10000 h
30000 h
980
[mm
1050
150
1000
500
200
100
50
10
5
2000
A
E
420350
490
560
700630
100 50
770
840
910
100000
50000
10000
5000
3
2
C
1
0
[bar]
D
[l/min]
[%]
7
51
2000
70 140 210
10535
1510
1000
280
245 175
20
30
25
35
315
40
45
350
50
[mm
2
/s]
500
200
100
50
10
5
A Short-time operation
B Continuous operation
C Pressure loss
D Flow rate
E Q
nom
The values apply for lubricating liquids at temperatures of up to 120 °C. Abrasive and aggressive liquids
reduce the durability.
16 OIO 14en Edition 07/2017 Operating Instructions
Load-bearing capacity
Load-bearing capacity OMG100
100000
50000
200
10000
B
400
20
18
16
14
12
10
C
8
6
4
2
0
[bar]
D
20
[l/min]
[%]
1
5000
600 800
2000
1000 h
A
5000 h
10000 h
30000 h
E
12001000
1400
1600
20001800
100 50
2200
2400
2600
2800
3000
150
[mm
2
/s]
1000
500
200
100
50
10
Technical data
5
100000
50000
10000
5000
3
2
C
1
[bar]
0
D
20
[l/min]
[%]
51
2000
200 400 600
300100
1510
20
1000
800
700 500
30
25
40
35
900
45
1000
2
/s]
[mm
500
200
100
50
10
5
50
A Short-time operation
B Continuous operation
C Pressure loss
D Flow rate
E Q
nom
The values apply for lubricating liquids at temperatures of up to 120 °C. Abrasive and aggressive liquids
reduce the durability.
Operating Instructions OIO 14en Edition 07/2017 17
Load-bearing capacity
20
18
16
14
12
2
4
6
8
10
0
A
B
1000 h
30000 h
10000 h
5000 h
100000
5
10
50
200
500
1000
2000
5000
10000
50000
100
[mm
2
/s]
C
[bar]
[bar]
C
2
3
0
1
100000
5000
10000
50000
5
10
50
200
500
1000
2000
100
[mm
2
/s]
1000
1500 2000
50004500
4000
3500
30002500
50
500
7500
7000
6500
6000
5500
E
D
[l/min]
100 50
150
D
[l/min]
50
45
40
30
25
20
1510
51
35
1750 1250
750250
50
2250
2500
500 1000 1500
2000
[%]
[%]
1
Load-bearing capacity OMG140
Technical data
A Short-time operation
B Continuous operation
C Pressure loss
D Flow rate
E Q
nom
The values apply for lubricating liquids at temperatures of up to 120 °C. Abrasive and aggressive liquids
reduce the durability.
18 OIO 14en Edition 07/2017 Operating Instructions
Electric heating system
Heating system
Flowmeters of the OMG series can be equipped optionally with a heating system. The manufacturer
recommends heating systems for high-viscosity liquids that do not flow sufficiently if not heated,
because bearing damage and destruction of the device may otherwise result.
Types:
□ Electrical or fluid heating system
□ Trace heating system by customer
Electric heating system
The electrical heating system for the flowmeter consists of a coiled tubing element. The coiled tubing
element consists of a heating sleeve that encloses the flowmeter housing.
Heating system
Fig. 1 Coiled tubing element with heating sleeve
Operating data:
□ Voltage: 230 V AC
□ Frequency: 50 Hz
□ Wire cross-section: 3 x 0.75 mm
2
□ Cable length for coiled tubing element: 1 m
Size [[ Heating output
OMG 13 [W] 180
OMG 20 – 32 [W] 180
OMG 52 [W] 800
OMG 68 – 100 [W] 2000
OMG140 [W] on request
If a coiled tubing element is used, the manufacturer recommends that the flowmeter and heating be
insulated in order to avoid radiation losses.
Operating Instructions OIO 14en Edition 07/2017 19
Fluid heating system
X
2
1
3
4
1
5
6
7
Fluid heating system
Fluid heating systems are available for the sizes OMG 20 – 140.
The fluid heating system consists of a heating jacket with pipe thread connections.
CAUTION
Damage to the device if water or steam id used as a heating fluid.
Heating system
► Use a suitable heating fluid such as heat transfer oil.
Operating data:
□ Pressure max.: 16 bars
□ Liquid temperature max.: 200 °C
Trace heating system
Contact the manufacturer before installing a trace heating system.
1 Heat insulation
2 Temperature sensor
with connecting cable
3 Trace heating
4 Flowmeter
5 Piping
6 Junction box
7 Pick up with
connecting cable
X Area stringently without
5
Fig. 2 Flowmeter with trace heating system
CAUTION
Defective pick up, temperature sensor or cabling due to exceeding of the maximum temperature.
► Do not heat the pick up, temperature sensor, junction box and corresponding cables above the
temperature specified in the associated operating instructions.
► Ensure that pick up 7, temperature sensor 2, junction box 6 and corresponding cables are not heat
insulated. The area X has to be free of heat insulation, see Fig. 2, page 20.
heat insulation
20 OIO 14en Edition 07/2017 Operating Instructions
Description
1
2/2a
3
4
5231
6
Function description
Description
Fig. 1 Structure of the flowmeter OMG series
1 Connection
2 Screw plug
2a Temperature sensor connection
3 Bearing cover
4 Measuring housing
5 Measuring screw small
Function description
78910
6 Ball bearing, floating bearing end
7 Measuring screw large
8 Ball bearing, fixed bearing end
9 Pick up hole
10 Pole wheel
As screw meters flowmeters belong to the group of rotating displacement meters. The fluid current
makes the measuring unit rotate. The displacement effect results from the continuous filling, axial
displacement and discharge of the volumes that are formed by the measuring housing and measuring
unit. The measured liquid flows around and lubricates all the rotating parts. Thanks to the displacement
principle, the flowmeter does not require inlet and smoothing sections in its supply and discharge.
Depending on the customer requirements, the flowmeters can be equipped with suitable end
connections for connection to various flanges.
Operating Instructions OIO 14en Edition 07/2017 21
Roller bearings
Roller bearings
The measuring unit is maintained without contact and with a low degree of friction in the housing of the
KRAL flowmeter by means of precision roller bearings. The bearing end at the pole wheel end is
realized as a fixed bearing. Depending on the respective size, the following bearings are used:
□ Single-row deep-groove ball bearings
□ Paired angular-contact ball bearings
□ Four-point contact bearings
The bearing point at the opposite end of the measuring unit is realized as a floating bearing with a
Function description
movable deep-groove ball bearing at all sizes.
Signal generation
A pole wheel 10, whose pole is sampled by a pick up, is affixed at the fixed-bearing end of the
measuring screw large 7. This pick up generates a specific number of pulses per flow volume unit depending on the size and working point. This device-specific characteristic is called the K-factor (unit:
Pulse/Liter) and is specified on the rating plate as well as the enclosed calibration certificate.
Possible formats of the signals are:
□ PNP
□ Push-pull
□ NAMUR
Depending on the design of the pick up either cylindrical rotors with embedded magnets or toothed
metal disks with varying tooth density can be used (higher number of poles = higher K-factor). Various
types of pick ups can be used depending on the application (operating temperature, required
frequencies):
□ Inductive pick ups
□ Pick ups based on the Hall effect
□ Magnetic pick ups
The rating plate of the flowmeter lists a preferred direction of flow at which the pick up lies on the flow-off
end. This preferred direction is based on the aim to position the pick up of the low-pressure end for the
case that the flowmeter is blocked.
Linearization
The calibration certificate contains a mean K-factor that has been determined for the flow range 10:1
and that can therefore be used across a wide flow range. However, the K-factor shows slightly different
values at different flow rates. These are also documented in the enclosed calibration certificate. If
highest measuring precision is required, it is therefore advisable, especially at strongly varying flow
rates, to take these different values into consideration by means of a "Linearization". The K-factors are
therefore fed into a suitable electronics unit across several interpolation values of the flow rate. The Kfactor relevant for the flow rate being measured is then determined by means of linear interpolation
between the two nearest interpolation values.
The viscosity dependence of the K-factors must also be taken into account. These are determined
during calibration at a viscosity of approximately 4.2 mm²/s. The influence of the flow rate on the K-factor
decreases at higher viscosities so that the mean K-factor can then also be used in a considerably larger
flow range without noteworthy errors.
22 OIO 14en Edition 07/2017 Operating Instructions
Temperature compensation
Temperature compensation
Flowmeters of the OMG series can be equipped additionally with temperature sensors in the sizes OMG
13 to OMG100. Mounting of a temperature sensor in the piping is advisable for the size OMG140. If the
flowmeter is equipped with a temperature sensor, the current density of the flowing liquid can be
calculated from this measured value by means of a density table stored in the electronics unit. A
normalized volume measurement is then possible at which the displayed values are converted to a
reference temperature that can be selected freely. This ensures that measuring errors caused by
changes in the density due to temperature variations are avoided.
Flow direction detection
Systems with a changing flow direction as well as systems with pressure pulsations - that can also
cause a reversal of the flow direction - require the use of a second pick up, see "Connection for the pick
ups", page 30. This additional phase-offset signal and the incremental encoding inputs available in the
KRAL electronic unit can be used to determine the direction of flow and to take it into consideration
when calculating the total values.
Junction box
The manufacturer offers a junction box that facilitates the electrical connection of the various sensors for
the flowmeters of the OMG series. Further information see "Accessories", page 51.
Function description
Operating Instructions OIO 14en Edition 07/2017 23
Unpacking and checking the state of delivery
Transportation, storage and dispos al
Unpacking and checking the state of delivery
1. On delivery unpack the flowmeter and check for damage during transportation.
2. Report damage during transportation immediately to the manufacturer.
3. Store the supplied pick ups and temperature sensors for the installation.
4. Dispose of packing material in accordance with the locally applicable regulations.
Lifting the flowmeter
Transportation, storage and disposal
Fig. 1 Fastening hoisting equipment – principle diagrams
WARNING
Risk of injury and/or damage to equipment should the flowmeter fall.
► Use intact and correctly dimensioned hoisting equipment in accordance with the total weight to be
transported.
► Select the attachment points for the hoisting equipment in accordance with the center of gravity
and the weight distribution.
► Use at least two load ropes.
► Do not stand under raised loads.
► Fasten the hoisting equipment to the flowmeter, see Fig. 1, page 24 and lift the flowmeter.
Storage
As a result of the calibration, the internal components of the flowmeter are wetted with calibration liquid
that has a preservative effect. In addition, a special anticorrosive agent is sprayed onto the interior of the
devices before being dispatched. The connections of the flowmeter are fitted with protective caps.
Unless otherwise specified, the external components of the flowmeter are preserved with a single-coat
PU-based two-component paint. The preservation applied at the factory will protect the flowmeter for up
to six weeks, if it is stored in a dry and clean location. The manufacturer offers a long-term preservation
for storage times of up to 60 months. In the case of long-term preservation the flowmeter is additionally
packed in hermetically sealing anti-corrosion paper.
CAUTION
Damage to device through corrosion if stored improperly and during longer standstills.
► Protect the flowmeters against corrosion during long standstills.
► Observe the chapters "Storage" and "Preserving".
24 OIO 14en Edition 07/2017 Operating Instructions
Preservation
Preservation
Preservation has to be carried out additionally under the following conditions:
Tab. 1 Check table for preservation
Preserving the flowmeter
1. Close a connection of the flowmeter with a blind flange.
2. Position the flowmeter vertically.
3. Fill non-corrosive and resin-free oil up to approx. 1 cm under the connection at the top, while turning
4. Close the upper connection with a blind flange.
5. Apply non-corrosive and resin-free oil to all the plain and unpainted parts of the outer housing.
After about six months storage check the oil level in the flowmeter and if necessary top up oil. Check the
preservation of the outer housing and if necessary apply oil to the parts again.
Type of delivery Condition
Standard delivery
□ Storage time exceeding six weeks
□ Unfavorable storage conditions such as high
humidity, salty air, etc.
Delivery with long-term preservation
the measuring unit slowly, so that the measuring unit also comes into contact with it.
□ Opened or damaged packaging
Notice:
Store the preserved flowmeter cool and dry and protect it against direct sunlight.
Notice:
After a longer storage time the manufacturer recommends that you have the flowmeter recalibrated, see
"Re-calibration of the flowmeters", page 34.
Removing the preservation
Aids:
□ Solvents suitable for the preservative oil
□ Vessel to collect the preservative oil
WARNING
Risk of injury through emitted preservative oil.
► Wear protective clothing during all the work.
► Open the blind flange carefully in order to reduce any pressure that may exist in the flowmeter.
► Collect the emitted preservative oil safely and dispose of it in an environmentally compatible
manner.
1. Remove one of the blind flanges.
2. Drain the flowmeter, collecting the preservative oil in a suitable vessel.
3. Remove the second blind flange.
4. Use a solvent to remove the residual oil.
- or ► Rinse the flowmeter with pumped liquid.
Transportation, storage and disposal
Operating Instructions OIO 14en Edition 07/2017 25
Disposal
Disposal
Aids:
□ Solvents or industrial cleaners suitable for the pumped liquid
WARNING
Danger of poisoning and environmental damage from the pumped liquid.
► Wear protective clothing during all the work.
► Before disposing of the flowmeter collect the discharging pumped liquid and dispose of in
accordance with the locally applicable regulations.
► Before disposing of the flowmeter neutralize the residues of the pumped liquid in the flowmeter.
1. Disassemble the flowmeter.
2. Clean residues of the pumped liquid from the individual parts.
3. Separate sealing elements made of elastomer from the flowmeter and dispose of them in the
residual waste.
4. Recycle cast-iron and steel parts.
Transportation, storage and disposal
26 OIO 14en Edition 07/2017 Operating Instructions
Safety instructions for installation and removal
1
2
3
4
Installation, removal and connection
Safety instructions for installation and removal
The following safety instructions must be observed:
□ Flowmeters are precision measuring devices.
► Ensure cleanliness and take care during installation and removal.
► Do not take apart the flowmeter.
► Do not remove the protective caps from the dry sleeves during installation. Put the protective
caps on the dry sleeves during removal.
► During installation only remove the screw plugs in order to insert the temperature sensors. Screw
in the screw plugs again after the temperature sensors have been removed.
► If installing a trace heating system, pick up, temperature sensor, junction box and corresponding
cables have to be free of heat insulation, see "Trace heating system", page 20.
Installing the flowmeter
Flowmeters of the OMG series can be operated in any installation position.
Notice:
Both directions of flow are possible. The preferred flow direction is indicated on the rating plate by
means of a bright arrow, see Fig. 2, page 7.
Installation types
Installation, removal and connection
Fig. 1 OMG installation types
The arrow with dashed line identifies the preferred flow direction when an operating filter is used.
Installation type Properties
1 □ Without bypass
□ With or without operating filter
2 □ Manual bypass
□ With or without operating filter
3 □ Bypass with 3 stop valves for flange
connection
□ Small space requirements
□ Dismantling of the flowmeter only with
interruption of operation
□ Bypass is opened manually
□ Dismantling of the flowmeter only with
interruption of operation
□ Dismantling of the flowmeter without
interruption of operation
□ With or without operating filter
4 □ Bypass with 3 stop valves for pipe thread
connection
□ With or without operating filter
Tab. 1 OMG installation types
Operating Instructions OIO 14en Edition 07/2017 27
□ Dismantling of the flowmeter without
interruption of operation
□ Minimally higher pressure loss
Installing the flowmeter
9
X
X
X
X
X
Preferred installation variant
Recommendations for alternative installation variants
Flow vertically from bottom to top
► Preferred installation variant.
Installation, removal and connection
Flow vertically from top to bottom
► Ensure that the liquid does not flow freely out
of the flowmeter, for example by routing the
piping upwards.
Horizontal flow
► Ensure that the liquid does not flow freely out
of the flowmeter, for example by routing the
piping upwards.
No vertical installation with open outlet
► Measuring error through free flowing of the
liquid out of the flowmeter.
No horizontal installation at the highest
point in the pipe system
► Avoid measuring error through formation of
an air pocket in the flowmeter.
No air bubbles in the pipe system
► Measuring error through air bubbles in the
pipe system. Vent the complete pipe system
thoroughly during commissioning.
28 OIO 14en Edition 07/2017 Operating Instructions
Installing the flowmeter
CAUTION
Measuring error through air in the pipe system and/or incorrect installation of the flowmeter.
► In the case of horizontal installation of the flowmeter at the highest point of the pipe system an air
pocket can arise that results in measuring errors.
► Vent the pipe system thoroughly before commissioning.
► At a vertical installation of the flowmeter and the flow direction from top to bottom ensure that the
liquid does not flow freely out of the flowmeter, for example by routing the pipe upwards or by
reducing the pipe diameter with a reducer.
► During the installation of the flowmeter observe the recommendations for the installation variants
and avoid error sources, see "Installing the flowmeter", page 27.
Protect the flowmeter against soiling
Notice:
In order to protect the flowmeter against soiling we generally recommend the installation of an operating
filter, mesh width see Tab. 1, page 32.
CAUTION
Damage through impurities in the pipe system.
Installation, removal and connection
► During welding work attach protective covers in front of the connecting flanges.
► Ensure when welding that welding beads and abrasive dust cannot get into the pipe system and
the flowmeter.
► After the connecting work clean the pipe system thoroughly, see "Cleaning the pipe system",
page 32.
Connecting the flowmeter to the pipe system
The connection of the flowmeter to the pipe system must be stress-free.
Fig. 2 Flange connections
CAUTION
Danger of damage to the device or impaired functionality through mechanical stresses.
► Ensure that the flowmeter mounting on the pipe system is free of mechanical stress.
CAUTION
Damage to device when the pipe threading is screwed in too far.
► Observe the thread length of the flowmeter.
► Use a standard cutting ring screwed connection.
Operating Instructions OIO 14en Edition 07/2017 29
Electrical connection
1. Remove the protective covers and store them.
2. Install the flowmeter stress-free in the pipe system while taking the preferred direction of flow into
account and ensure that the connections of the pick ups and temperature sensors remain
accessible.
3. The screw-in length of the piping may not exceed the threaded length of the flowmeter, since the
flow cross-section is narrowed and internal components can be damaged.
Electrical connection
Safety instructions for electrical installation
Observe the following safety instructions during the electrical installation:
□ The following qualifications are required for the electrical connection:
▪ Practical electrotechnical training
▪ Knowledge of the safety guidelines at the workplace
▪ Knowledge of the electrotechnical safety guidelines
► The connecting lines of the connections for pick ups and temperature sensors are to be
shielded and laid separately from the supply lines.
► Ensure that the supply voltage is correct.
Installation, removal and connection
► Observe the corresponding operating instructions for pick ups, temperature sensors and
electronic equipment.
Connection for the pick ups
The flowmeter can be equipped with two pick ups for flow direction detection. The first signal measures
the flow rate, the second signal determines the direction of flow. The pick ups have to be connected
correctly in order to obtain the correct values. The connections are marked on the flowmeter housing
and "2". This marking depends on the preferred direction of flow in accordance with the arrow on
with "1"
the rating plate, see Fig. 2, page 7. In the case of a direction of flow contrary to the preferred direction of
flow the connections have to be swapped in order to obtain a correct signal.
CAUTION
Measuring error through incorrectly mounted pick ups.
► Ensure that the pick ups are mounted at the correct position.
► Observe the corresponding operating instructions for pick ups.
Removing the flowmeter
Prerequisite:
□ System switched off
Aids:
□ Vessel to collect pumped liquid
DANGER
Risk of death resulting from electric shock while the heating is being removed.
► Ensure that the supply voltage is de-energized.
► The flowmeter may only be separated from the power supply by an authorized electrician.
30 OIO 14en Edition 07/2017 Operating Instructions
Removing the flowmeter
WARNING
Risk of injury through emitted hot, poisonous or corrosive pumped liquid when removing the
flowmeter.
► Observe the safety regulations for handling dangerous liquids.
► Ensure that the flowmeter is not under pressure.
► Collect the emitted pumped liquid safely and dispose of it in an environmentally compatible
manner.
1. In case of operation at higher temperatures wait until the device has cooled down to the ambient
temperature.
2. Drain the pipe system or divert the fuel via the bypass.
3. Dismantle the flowmeter.
4. Apply the protective cover.
5. Observe the chapters "Storage" and "Preserving" on the subject of storing the flowmeter.
Installation, removal and connection
Operating Instructions OIO 14en Edition 07/2017 31
Commissioning
Operation
Operation
Commissioning
Cleaning the pipe system
To protect the flowmeter against soiling carefully clean the complete pipe system carefully before
commissioning.
Possibilities:
□ Rinsing via bypass
□ Rinsing with flowmeter
CAUTION
Damage to equipment through usage of an incorrect rinsing liquid.
► Under no circumstances may water or superheated steam be used to rinse the pipe system.
► Rinsing via bypass: Close the shut-off devices before and after the flowmeter.
- or ► Rinsing with flowmeter: An operating filter has to be installed before the flowmeter. Take the mesh
width of the filter into account, see Tab. 1, page 32.
The mesh width of the operating filter is relevant to the size of the flowmeter.
flowmeter size Mesh width max.
OMG 13 – 20 [mm] 0.1
OMG 32 – 140 [mm] 0.34
Tab. 1 Mesh width of the operating filter
Checking the function
Test Procedure
Installation ► Check the direction of flow of the flowmeter.
► Check the installation and installation position
of the pick ups and of the temperature sensor.
► Check the pipe threading/flange and the
temperature sensors for leaks under operating
pressure.
Electrical installation ► Observe the corresponding operating
instructions for pick ups, temperature sensors
and electronic equipment.
Power supply ► Observe the corresponding operating
instructions for pick ups, temperature sensors
and electronic equipment.
Tab. 2 Function check table
Commissioning the flowmeter
Prerequisite:
□ The ambient conditions correspond to the operating data, see "Technical data", page 8
□ Flowmeter correctly installed into the pipe system, see "Installing the flowmeter", page 27
□ Flowmeter connection to the pipe system is free of mechanical stress
□ Pipe system is free of contamination and dirt particles
□ Pipe system vented
□ Shut-off devices in the supply and discharge lines opened
32 OIO 14en Edition 07/2017 Operating Instructions
Switching off the flowmeter
CAUTION
Measuring error through gas inclusion in the pipe system.
► Before commissioning, make sure that the flowmeter is filled.
► Vent the pipe system.
CAUTION
Increased wear and/or blocking of the flowmeter due to solid particles or abrasive fine particles in the
liquid.
► Protect the flowmeter by a correspondingly dimensioned operating filter in the pipe system.
► Switch on the system.
The flowmeter measures when the pick up generates a signal.
Switching off the flowmeter
Safety instruction for switching off the flowmeter
Operation
Pay attention to the following when switching off the flowmeter:
□ Strong changes to the flow rate (e.g. rapid shutdown, pulsations ...) cause marked pressure
differences on the flowmeter and can damage the measuring unit.
▪ The pressure loss of the flowmeter must not exceed the values given in the chapter "Technical
data", see "Load-bearing capacity", page 12.
Switching off the flowmeter
When the flow through the flowmeter is stopped, the generation of the signal stops automatically. No
further measures are required to switch off.
Recommissioning the flowmeter
Prerequisite:
□ The requirements for commissioning are met, see "Commissioning", page 32
CAUTION
Damage to device through hard, gummy or crystallized liquid in the flowmeter.
► Before commissioning, ensure that there is no hard, gummy or crystallized liquid in the flowmeter.
1. Disassemble and clean the flowmeter before recommissioning
- or ► Heat up the liquid during standstill by means of a heating system.
2. Switch on the system.
Under the requirements mentioned above, the flowmeter is ready for operation at any time.
Operating Instructions OIO 14en Edition 07/2017 33
Safety instructions on maintenance
Maintenance
Maintenance
Safety instructions on maintenance
The following safety instructions must be observed during all the repair work:
► All the work may only be carried out by authorized qualified personnel.
► Wear protective clothing during all the work.
► Replacement of the measuring unit consisting of the set of screws, roller bearings and pole wheel
► The flowmeter has to be recalibrated after the measuring unit or the roller bearing has been
► Observe the pick up operating instructions when replacing the pick up insert.
► Observe the corresponding operating instructions when replacing the temperature sensor
► Do not twist the dry sleeve. The guarantee for the flowmeter expires if the red sealing point is
► Also observe the general drawings during all the work at the flowmeter, see "General drawings",
Required maintenance
Flowmeters are fundamentally maintenance-free. Under observance of the operating limits, see
"Technical data", page 8, no significant change in the characteristics could be established, even after
years of use in many cases. Conditions lying clearly above the nominal flow rate can, however, result
in excessive wear. In the case of liquids with higher abrasiveness (e.g. heavy oil with catalyst
residues, plastic components with fillers, etc.) strongly accelerated wear can occur in the flowmeter.
Notice:
In cases of doubt the manufacturer recommends already carrying out the first inspection of the
flowmeter after twelve weeks operation time.
may only be carried out in the factory.
replaced.
insert.
damaged.
page 46.
Signs of progressive wear of individual flowmeter elements:
Finding Cause Remedy
Increased running noises Incipient damage to bearing Replace the bearing.
Leakage Damage to sealing Replace the seals or dry sleeve.
Measured values not
realistic
Tab. 1 Check table for required maintenance
1. Check the flowmeter visually and acoustically every four weeks.
2. Check for signs of wear as listed in the table above and eliminate the cause.
see "Fault table", page 45 see "Fault table", page 45
Re-calibration of the flowmeters
In order to maintain the high measuring precision of the flowmeter, the manufacturer recommends
carrying out the first re-calibration after about one year of operation. The results reveal any wear starting
on the measuring unit. The interval at which recalibration is actually required depends strongly on the
operating conditions of the device.
The manufacturer provides the factory calibration as standard. If higher requirements are placed on the
measuring instrument, an accredited calibration according to EN ISO/IEC 17025 is also possible.
34 OIO 14en Edition 07/2017 Operating Instructions
Mounting instructions OMG 13
915.1
080.1
739.5**
128
039
739.1
062
817.3
817.1
817.2
817.4
672.2
672.1
259
041
A
A
Mounting instructions OMG 13
Removing seals and bearings
Maintenance
039
041
062
080.1
128
259
672.1
Fig. 1 Fig. 2
039
Fig. 3 Fig. 4
Prerequisites:
672.2
739.1
739.5**
817.1
817.2
817.3
817.4
915.1
A
**
□ Flowmeter removed from system
□ End connection consisting of socket screws, flanges and seals removed
□ Pick up inserts removed
Distance sleeve
Sleeve
Spacer
Bearing cover
Measuring housing
Pole wheel
Measuring screw large
Measuring screw small
O-ring
O-ring
Deep-groove ball bearing
Deep-groove ball bearing
Deep-groove ball bearing
Deep-groove ball bearing
Socket screws
Grooved insert pin
two units if two pick up holes
exist
1. Remove the socket screws 915.1, take off the bearing cover 080.1.
2. Remove the O-ring 739.5** from the bearing cover, see Fig. 1, page 35.
3. Remove the spacer 062 and O-ring 739.1 , pull the screw set together with distance sleeve 039 from
the measuring housing 128. Take the combination into account to ensure subsequent assembly, see
Fig. 2, page 35.
4. Pull the pole wheel 259, ball bearing 817.1, sleeve 041 and ball bearing 817.2 from the measuring
screw large 672.1, and the ball bearings 817.3 and 817.4 from the measuring screw small 672.2, see
Fig. 3, page 35.
Operating Instructions OIO 14en Edition 07/2017 35
Mounting instructions OMG 13
Installing seals and bearings
1. Slide the sleeve 041 onto the measuring screw large 672.1, while taking the mounting direction into
2. Press the ball bearings 817.1, 817.2, 817.3 and 817.4 onto the measuring screw large 672.1 and
Maintenance
3. Insert the O-ring 739.5** into the bearing cover 080.1.
4. Push the screw set into the measuring housing 128, paying attention to the configuration. Slide the
5. Insert the O-ring 739.1 into the measuring housing. Lay on the spacer 062, ensuring that it is
6. Place the bearing cover 080.1 onto the measuring housing, ensuring that the grooved insert pins A
7. Mount the flange cover while pretensioning the oiled screws crosswise. Tightening torque see
account, see Fig. 3, page 35.
measuring screw small 672.2.
Notice: Press the ball bearings on only over the inner ring.
Press the pole wheel 259 onto the measuring screw large.
distance sleeve 039 into the hole of the measuring screw small 672.2, see Fig. 4, page 35.
positioned correctly, see Fig. 2, page 35.
in the measuring housing fit into the corresponding holes. Tighten the socket screws 915.1.
Tab. 2, page 53.
36 OIO 14en Edition 07/2017 Operating Instructions
Mounting instructions OMG 20/32
915.1
070.1
128
070.2
915.2
739.2
739.1
739.5**
070.1
039
128
869.4
817.4
672.2
817.3
064.2
904.2
915.7
869.2
817.2
672.1
817.1
056
259
915.6
904.1
064.1***
AA039
Mounting instructions OMG 20/32
Removing seals and bearings
Maintenance
Fig. 5 Fig. 6
Fig. 9
039
056
064.1***
064.2
070.1
070.2
128
259
672.1
Distance sleeve
Spacer
Supporting ring
Supporting ring
End cover
End cover
Measuring housing
Pole wheel
Measuring screw large
672.2
739.1
739.2
739.5**
817.1
817.2
817.3
817.4
869.2
Measuring screw small
O-ring
O-ring
O-ring
Deep-groove ball bearing
Deep-groove ball bearing
Deep-groove ball bearing
Deep-groove ball bearing
Circlip
Fig. 7
Fig. 8
Fig. 10
869.4
Circlip
904.1
Lock washer
904.2
Lock washer
915.1
Socket screws
915.2
Socket screws
915.6
Socket screws
915.7
Socket screws
A
Grooved insert pin
**
***
Prerequisites:
two units if two pick up holes exist
only for OMG 32
□ Flowmeter removed from system
□ End connection consisting of socket screws, flanges and seals removed
□ Pick up inserts removed
Operating Instructions OIO 14en Edition 07/2017 37
Mounting instructions OMG 20/32
1. Remove the socket screws 915.1 and 915.2, take off the end covers 070.1 and 070.2, see Fig. 5,
2. Remove the O-rings 739.1, 739.2 and 739.5**, see Fig. 6, page 37.
3. Pull the distance sleeve 039 together with the set of screws out of the measuring housing, see
Maintenance
4. Remove the circlips 869.2 and 869.4 from the measuring screws. Overview see Fig. 9, page 37.
5. Screw out the socket screws 915.6 and 915.7 and remove the lock washers 904.1, 904.2 and
6. Turn in the socket screw 915.6 back completely in order to pull the pole wheel 259 and spacer 056
7. Pull the ball bearings from the screws using the extractor.
Installing seals and bearings
1. Insert the O-rings 739.1 and 739.2 into the end covers 070.1 and 070.2, insert the O-ring 739.5**
2. Press the ball bearings 817.1, 817.2, 817.3 and 817.4 onto the measuring screw large 672.1 and
3. Slide the spacer 056 onto the measuring screw large 672.1, press the pole wheel 259 on.
4. Pull the wedge lock washers 904.1 and 904.2
5. Mount the socket screws 915.6 and 915.7, with Loctite 242 applied, with mounted washer and ring
6. Mount the circlips 869.2 and 869.4 on the floating bearing end.
7. In case of BSPP connection: Place the end cover 070.2 on the measuring housing, lay out the
8. Pretension the oiled screws crosswise and tighten with torque, see Tab. 2, page 53.
9. Slide the set of screws in the measuring housing. Slide the distance sleeve 039 into the hole of the
10. Place the end cover 070.1 onto the measuring housing, ensuring that the grooved insert pins A in
11. In case of BSPP connection: Lay out the socket screws 915.1.
12. Pretension the oiled screws crosswise and tighten with torque, see Tab. 2, page 53.
page 37.
Fig. 7, page 37.
support rings 064.1***, 064.2.
from the measuring screw large 672.1 using an extractor. Remove the socket screw 915.6 again.
into the pick up hole.
measuring screw small 672.2.
Notice: Press the ball bearings on only over the inner ring.
and support rings 064.1*** and 064.2 onto the sockets
screws 915.6 and 915.7. Overview see Fig. 9, page 37.
Notice: Ensure that the wedge lock washers are positioned correctly (wedge surface to wedge
surface), see Fig. 8, page 37.
onto the measuring screws and tighten with torque, see Tab. 2, page 53.
socket screws 915.2.
- or ► In case of flange connection: Place the end cover 070.2 and flange cover 115.2* with O-ring
739.4* on the measuring housing, lay out the socket screws 915.4*. Overview see Fig. 2, page 47.
measuring screw small 672.2, see Fig. 10, page 37.
the measuring housing fit into the corresponding holes.
- or ► In case of flange connection: Place on the flange cover 115.1* with O-ring 739.3* and lay out the
socket screws 915.3*. Overview see Fig. 2, page 47.
38 OIO 14en Edition 07/2017 Operating Instructions
Mounting instructions OMG 52/68
128
739.1
915.6
904.1
064.1
259
056
915.7
904.2
064.2
080.1
057.1
057.2
739.5**
739.1
080.1
915.6
904.1
064.1
259
056
739.5**
080.1
818.1
057.1
672.1
817.1
868.2
869.2
672.2
915.7
904.2
064.2
818.2
057.2
817.2
868.4
869.4
054
Mounting instructions OMG 52/68
Removing seals and bearings
Fig. 11 Fig. 12
Maintenance
080.1
Fig. 13 Fig. 14 Fig. 15
Fig. 16
Operating Instructions OIO 14en Edition 07/2017 39
Fig. 17 Fig. 18
Mounting instructions OMG 52/68
054
056
057.1
057.2
Maintenance
064.1
064.2
080.1
128
259
672.1
Prerequisites
□ Flowmeter removed from the system
□ End connection consisting of socket screws, flanges and seals removed
□ Pick up inserts removed
1. Remove the socket screws 915.1 and 915.2, take off the bearing cover 080.2. Remove the O-ring
2. Use light blows of a plastic tip hammer to drive the screw set together with the bearing cover 080.1
3. Screw out the socket screw 915.6 with lock washer 904.1 and supporting ring 064.1 from the
4. Screw out the socket screw 915.7 with lock washer 904.2 and supporting ring 064.2 from the
5. Remove the screw set from the bearing cover 080.1 using an extractor.
6. Screw out the threaded rings 057.1 and 057.2 of the bearing cover, see Fig. 14, page 39. For allen
7. Take the spacer 054 out, and pull the bearings 818.1 and 818.2 out of the bearing cover using an
8. Remove the O-rings 739.1 and 739.5**, see Fig. 15, page 39.
9. Remove the circlips 869.2 and 869.4 and support rings 868.2 and 868.4 from the measuring screws,
10. Pull the bearings 817.1 and 817.2 from the measuring screws using an extractor.
Spacer
Spacer
Threaded ring
Threaded ring
Supporting ring
Supporting ring
Bearing cover
Measuring housing
Pole wheel
Measuring screw large
739.2, without picture.
out of the measuring housing 128 and pull out, see Fig. 11, page 39.
measuring screw large 672.1. Remove the pole wheel 259 and the spacer 056, see Fig. 12, page 39.
measuring screw small 672.2, see Fig. 12, page 39.
key widths, see Tab. 2, page 41.
extractor.
see Fig. 16, page 39.
672.2
739.1
739.5**
817.1
817.2
818.1
818.2
868.2
868.4
869.2
Measuring screw small
O-ring
O-ring
Deep-groove ball bearing
Deep-groove ball bearing
Angular-contact ball bearings
Angular-contact ball bearings
Support ring
Support ring
Circlip
869.4
904.1
904.2
915.6
915.7
**
Circlip
Lock washer
Lock washer
Socket screw
Socket screw
two units if two pick
up holes exist
40 OIO 14en Edition 07/2017 Operating Instructions
Mounting instructions OMG 52/68
Installing seals and bearings
1. Insert the O-rings 739.1 and 739.2 into the bearing cover 080.1 and 080.2. Insert the O-ring 739.5**
into the pick up hole.
2. Press the ball bearings 818.1 and 818.2 into the bearing cover 080.1.
Notice: Press the angular-contact ball bearings on in face-to-face arrangement, see Fig. 18, page
39. To avoid damages press the ball bearings on only over the outer ring.
3. Put spacer 054 on ball bearing 817.1.
4. Press the ball bearing 817.1 onto the measuring screw large 672.1 and the ball bearing 817.2 onto
the measuring screw small 672.2.
Notice: Press the ball bearings on only over the inner ring.
5. First screw the threaded ring 057.2, then the threaded ring 057.1 into the bearing cover using the
allen key. Allen key widths and tightening torques, see Tab. 2, page 41.
6. Press the measuring screws into the bearings in the bearing cover.
Notice: To avoid damages support the inner rings of the ball bearings.
7. Pull the lock washer 904.2 and supporting ring 064.2 onto the socket screw 915.7.
Notice: Ensure that the lock washers are positioned correctly (wedge surface to wedge surface),
see Fig. 17, page 39.
8. Mount the socket screw 915.7, with Loctite 242 applied, with mounted washer and ring onto the
measuring screw small 672.2 and tighten with torque, see Tab. 2, page 53.
9. Slide the spacer 056 onto the measuring screw large 672.1. Press the pole wheel 259 on.
10. Pull the lock washer 904.1 and supporting ring 064.1 onto the socket screw 915.6.
11. Mount the socket screw 915.6, with Loctite 242 applied, with mounted washer and ring onto t
measuring screw large 672.1 and tighten with torque, see Tab. 2, page 53.
12. Mount the support rings 868.2 and 868.4 and circlips 869.2 and 869.4 on the floating bearing end.
13. Place the bearing cover 080.2 onto the measuring housing 128 and tighten with torque the socket
screws 915.2.
14. Slide the bearing cover 080.1 with pre-mounted measuring unit, consisting of screw set and pole
wheel, into the measuring housing, tighten with torque the socket screws 915.1.
15. Mount the flange cover while pretensioning the oiled screws crosswise. Tightening torque see
Tab. 2, page 53.
Maintenance
he
Size Measuring screw Pos. no. Allen key width [mm] Tightening torque [Nm]
52 large 057.1 22 90
small 057.2 19 90
68 large 057.1 32 160
small 057.2 19 55
Tab. 2 Allen key width and tightening torque for threaded ring
Operating Instructions OIO 14en Edition 07/2017 41
Mounting instructions OMG100/140
128
080.1
739.5**
739.1
080.1
915.6
904.1
064.1
259
056***
869.4
868.4
672.2
870.2
868.3
821.2
064.2
904.2
915.7
869.2
868.2
672.1
870.1
821.1
739.5**
868.1
817.2
817.1
080.1
Mounting instructions OMG100/140
Removing seals and bearings
Maintenance
Fig. 20 Fig. 21 Fig. 22
739.1
Fig. 19
Fig. 23
041
056***
064.1
064.2
080.1
128
259
42 OIO 14en Edition 07/2017 Operating Instructions
672.1
672.2
**
***
Sleeve
Spacer
Supporting ring
Supporting ring
Bearing cover
Measuring housing
Pole wheel
Measuring screw large
Measuring screw small
two units if two pick up holes exist
OMG140: replaced by sleeve, spare part 041
739.1
739.5**
817.1
817.2
821.1
821.2
868.1
868.2
868.3
O-ring
O-ring
Deep-groove ball bearing
Deep-groove ball bearing
Four-point contact bearings
Four-point contact bearings
Support ring
Support ring
Support ring
868.4
869.2
869.4
870.1
870.2
904.1
904.2
915.6
915.7
Support ring
Circlip
Circlip
Circlip
Circlip
Lock washer
Lock washer
Socket screw
Socket screw
Mounting instructions OMG100/140
Prerequisites:
□ Flowmeter removed from the system
□ End connection consisting of socket screws, flanges and seals removed
□ Pick up inserts removed
1. Remove the socket screws 915.1 and 915.2, take off the bearing cover 080.2. Remove the O-ring
739.2.
2. Use light blows of a plastic tip hammer to drive the set of screws together with the bearing cover
080.1 out of the measuring housing 128, see Fig. 20, page 42 and pull out.
3. Loosen the circlips 870.1 and 870.2 from recesses in the bearing cover, see Fig. 21, page 42, screw
out the socket screw 915.6.
4. Remove the lock washer 904.1 and supporting ring 064.1. Turn in the socket screw 915.6 back
completely in order to pull the pole wheel 259 and bearing cover 080.1 from the set of screws using
an extractor. Remove the spacer 056*** or sleeve 041 respectively. see Fig. 23, page 42.
5. Remove the measuring screws from the bearing cover 080.1. Remove the O-rings 739.1 and
739.5**, see Fig. 19, page 42.
6. Screw out the socket screw 915.7 with lock washer 904.2 and supporting ring 064.2 at the
measuring screw small 672.2.
7. Remove the circlips 869.2 and 869.4 and support rings 868.2 and 868.4 from the measuring screws.
8. Pull the bearings from the screws using the extractor. Avoid damage to the threads.
Notice: 821.1 and 821.2 are four-point contact bearings.
9. Screw the socket screw 915.6 out again and remove the support rings 868.1 and 868.3.
Installing seals and bearings
1. Insert the O-ring 739.1 and 739.2 into the bearing cover 080.1 and 080.2. Insert the O-ring 739.5**
into the pick up hole.
2. Slide the circlips 870.1 and 870.2 and support rings 868.1 and 868.3 onto the measuring screw large
672.1 and measuring screw small 672.2.
3. Press the ball bearings 821.1, 817.1, 821.2 and 817.2 onto the measuring screw large 672.1 and
measuring screw small 672.2. Notice: Press the ball bearings on only over the inner ring.
4. Pull the wedge lock washer 904.2 and supporting ring 064.2 onto the socket screw 915.7.
Notice: Ensure that the wedge lock washers are positioned correctly (wedge surface to wedge
surface), see Fig. 22, page 42.
5. Mount the socket screw 915.7, with Loctite 242 applied, with mounted washer and ring onto the
measuring screw small 672.2 and tighten with torque, see Tab. 2, page 53.
6. Slide the measuring screws into the bearing cover 080.1. Mount the circlips 870.1 and 870.2.
7. Slide the spacer 056** or sleeve 041 onto the measuring screw large. Press the pole wheel 259 on.
8. Pull the wedge lock washer 904.1 and supporting ring 064.1 onto the socket screw 915.6.
Notice: Ensure that the wedge lock washers are positioned correctly (wedge surface to wedge
surface), see Installation step 4.
9. Mount the socket screw 915.6, with Loctite 242 applied, with mounted washer and ring onto the
measuring screw large and tighten with torque, see Tab. 2, page 53.
10. Mount the support rings 868.2 and 868.4 and circlips 869.2 and 869.4 on the floating bearing end.
11. Place the bearing cover
screws 915.2.
12. Slide the bearing cover 080.1 with pre-mounted measuring unit, consisting of set of screws, bearings
and pole wheel, into the measuring housing, tighten with torque the socket screws 915.1.
13. Mount the flange cover while pretensioning the oiled screws crosswise. Tightening torque see
Tab. 2, page 53.
080.2 onto the measuring housing 128 and tighten with torque the socket
Maintenance
Operating Instructions OIO 14en Edition 07/2017 43
Possible faults
Troubleshooting
Faults can have different causes. The following tables list the symptoms of a fault, the possible causes
and measures for elimination.
Possible faults
Fault Cause/Elimination
□ Flowmeter leaks 1, 2, 8
Troubleshooting
□ No flow rate 3, 9, 10, 22, 24, 25
□ Negative flow rate 5, 17, 19
□ Flowmeter does not generate a pulse 3, 4, 5, 6, 7, 8, 10, 13, 20, 22, 24, 25
□ Pressure loss too high 11, 14, 22, 23
□ Measured values not realistic 3, 4, 5, 6, 7, 9, 12, 15, 16, 17, 18, 19, 20, 21, 22, 23
Troubleshooting
No. Cause Remedy
1 Seal preload too low ► Preload the screws.
2 Seal damaged ► Replace the seal.
3 Foreign bodies in the liquid and/or
flowmeter
4 Pick up not positioned correctly ► Position the pick up correctly, see "Connection for
5 Pick up not connected correctly ► Check the connection of the pick up, see
6 Pick up defective ► Check the function of the pick up, while observing
7 Dry sleeve not adjusted correctly ► Set the dry sleeve correctly, while observing the pick
8 Dry sleeve destroyed ► Replace dry sleeve, please contact the manufacturer
9 Liquid lubricates too little ► Use the OMK series.
10 Feed pressure too low ► Increase the inlet pressure.
11 Viscosity of the liquid too high ► Increase the temperature, while observing the
12 Viscosity of the liquid too low ► Use the OMK series.
13 Flow rate too low ► Increase the flow rate
► Check the chemical resistance of the seal.
► Dismantle the flowmeter and clean it.
► Use the commissioning filter.
the pick ups", page 30.
► Observe the pick up operating instructions.
"Connection for the pick ups", page 30.
► Check the supply voltage for the pick up, while
observing the pick up operating instructions.
the pick up operating instructions.
up operating instructions.
for information.
permissible temperature range.
- or ► Use a suitable flowmeter size
- or ► Use linearization, while observing the electronic
operating instructions.
14 Flow rate too high ► Reduce the flow rate
- or ► Use a suitable flowmeter size.
15 Airlocks ► Deaerate the system and check for leaks.
44 OIO 14en Edition 07/2017 Operating Instructions
Troubleshooting
No. Cause Remedy
16 Outgassing ► Increase the system pressure.
17 Pulsations too high ► Use another feed pump.
18 Back pressure too low ► Increase the back pressure.
19 Flow rate fluctuations too high ► Ensure a continuous flow rate by taking suitable
20 Filling amount too low ► Use a suitable flowmeter size.
21 Strongly deviating operating data ► Use a suitable flowmeter type.
22 Wear at the measuring unit and
23 Sluggishness through deposits ► Disassemble the flowmeter and clean it carefully.
24 Flow impaired at the system end ► Check whether the fluid flows in the system (pump in
25 Flowmeter switched to bypass ► Switch the flowmeter to through-flow.
bearing
► Reduce the temperature.
► Carry out changes to the system.
Troubleshooting
measures (use of a different pump. valve, damper,
etc.)
- or ► Smoothen the indication,
while observing the electronic operating
instructions.
► Use a suitable flowmeter type.
► Adapt the operating data to the flowmeter.
► Renew the measuring unit.
► Replace the bearing.
► Filter out the abrasive materials.
operation, slide valve opened, etc.).
► Check whether shut-off devices before and after the
flowmeter are opened.
Tab. 1 Fault table
Operating Instructions OIO 14en Edition 07/2017 45
General drawings
915.5
107.1*
039
107.2*
739.3
739.4
128
062
739.1
080.1
597.1
915.1
817.4
672.2
817.3
739.5**
817.2
672.1
259
817.1
041
Appendix
Appendix
General drawings
Fig. 1 Exploded view OMG 13
46 OIO 14en Edition 07/2017 Operating Instructions
General drawings
915.3*
115.1*
739.3*
739.4*
115.2*
915.4*
915.2*
070.2
739.2
128
039
739.1
070.1
597.1
739.5**
915.1*
869.4
817.4
672.2
817.3
064.2
904.2
915.7
869.2
817.2
672.1
817.1
056
259
915.6
904.1
064.1***
Appendix
Fig. 2 Exploded view OMG 20/32
Operating Instructions OIO 14en Edition 07/2017 47
General drawings
915.3
107.1*
739.3
739.4
107.2*
915.4
915.2
080.2
597.2
739.2
128
739.1
080.1
597.1
915.1
869.4
868.4
817.2
672.2
057.2
818.2
064.2
904.2
915.7
739.5**
869.2
868.2
817.1
672.1
057.1
818.1
056
259
064.1
904.1
915.6
054
Appendix
Fig. 3 Exploded view OMG 52/68
48 OIO 14en Edition 07/2017 Operating Instructions
General drawings
915.3
107.1*
739.3
739.4
915.4
107.2*
915.6
904.1
064.1
259
056***
915.2
080.2
597.2
739.2
128
739.1
080.1
597.1
915.1
869.4
868.4
817.2
672.2
870.2
868.3
821.2
064.2
904.2
915.7
869.2
868.2
817.1
672.1
870.1
868.1
821.1
739.5**
Appendix
Fig. 4 Exploded view OMG100/140
Operating Instructions OIO 14en Edition 07/2017 49
Parts list
Appendix
Parts list
Pos. no. Part Pos. no. Part
039 Distance sleeve 739.5** O-ring
041 Sleeve 817.1 Deep-groove ball bearing
054 Spacer 817.2 Deep-groove ball bearing
056 Spacer 817.3 Deep-groove ball bearing
056*** Spacer 817.4 Deep-groove ball bearing
057.1 Threaded ring 818.1 Angular-contact ball bearings
057.2 Threaded ring 818.2 Angular-contact ball bearings
062 Spacer 821.1 Four-point contact bearings
064.1 Supporting ring 821.2 Four-point contact bearings
064.1**** Supporting ring 868.1 Support ring
064.2 Supporting ring 868.2 Support ring
070.1 End cover 868.3 Support ring
070.2 End cover 868.4 Support ring
080.1 Bearing cover 869.2 Circlip
080.2 Bearing cover 869.4 Circlip
107.1* Pipe threaded flange 870.1 Circlip
107.2* Pipe threaded flange 870.2 Circlip
115.1* Flange 904.1 Lock washer
115.2* Flange 904.2 Lock washer
128 Measuring housing 915.1 Socket screw
259 Pole wheel 915.1* Socket screw
597.1 Screw plug 915.2 Socket screw
597.2 Screw plug 915.2* Socket screw
672.1 Measuring screw large 915.3 Socket screw
672.2 Measuring screw small 915.3* Socket screw
739.1 O-ring 915.4 Socket screw
739.2 O-ring 915.4* Socket screw
739.3 O-ring 915.5 Socket screw
739.3* O-ring 915.6 Socket screw
739.4 O-ring 915.7 Socket screw
739.4* O-ring
* parts for pipe threading or flange connection alternatively
** two units if two pick up holes exist
*** for OMG140: replaced by sleeve, spare part 041
**** only for OMG 32
Tab. 1 Parts list
50 OIO 14en Edition 07/2017 Operating Instructions
Accessories
1
2
Accessories
Junction box
The junction box simplifies the electrical connection of the various sensors. Up to three sensors can be
connected. The sensor cables are combined to form a multi-strand connecting cable which can be
supplied as well optionally if required. The detailed assignment plan can be found on the inside of the
junction box lid.
The junction boxes are suitable for flowmeters with pipe threading or flanged connection and can be
mounted on the sizes OMG 20 - 140.
Appendix
Fig. 5 Junction box UZA 11 Fig. 6 OMG 32 with installed UZA 11
1 Output
2 Sensor inputs
Junction boxes UZA 09 UZA 10 UZA 11
suitable for BEG 43D, BEG 44
EET 32 EET 33, EET 34
Electrical specification
□ Sensor inputs 1 2 3
□ Outputs 1 1 1
Mechanical specification
□ Liquid temperature max. [° C] +150
□ Housing material Aluminum
□ Connection thread M6
□ Fastening type directly on device
Operating Instructions OIO 14en Edition 07/2017 51
Accessories
1
2
4
5
3
6
7
BEG 1 BEG 2 EET
BEM
1
0 V Q
1
24 V Q
298
Com. t
34 675
26345 7
Sig.2 Q
Sig. t
Com. t
24 V Q
Sig.1 Q
0 V Q
Sig. t
24 V Q
Com. t
Com. t
Sig.1 Q
Sig.2 Q
0 V Q
Appendix
Mounting and connecting the junction box
Fig. 7 Junction box
1 Temperature sensor cable
2 Pick up cable
3 Base plate junction box
4 Socket screw and washer
5 Socket screws and washers
6 Cable gland sensor inputs
7 Junction box lid
Fig. 8 Mounting the junction box
1. Disconnect the cables of the pick up 2 and the temperature sensor 1. Ensure that the cable length is
sufficient.
2. Fasten the base plate of the junction box 3 to the flowmeter using the screw 4.
3. Fasten the lower part of the junction box to the base plate 3 using the screws 5.
4. Carry out the cabling through the cable gland 6, using the connection circuit diagram, see Fig. 9,
page 52.
5. Screw tight the lid of the junction box 7.
52 OIO 14en Edition 07/2017 Operating Instructions
Fig. 9 Connection circuit diagram junction box
Tightening torques
Connecting the extension cable
Normally the line length does not influence the functional efficiency of the sensors. However, the
manufacturer recommends not extending the connection cable of the junction box beyond a maximum
length of 100 m. Extension cable as well as cable plug and cable box are available as accessories from
the manufacturer.
Extension cable
□ Length max. [m] 100
□ Cable diameter max. [mm] 9.5
□ Wire cross-section
min. – max.
Pay attention to the following when connecting the extension cable:
► Use only a shielded cable.
► Lay the cable separately from the supply lines, see "Safety instructions for electrical installation",
page 30.
1. Solder cable plug to the sensor cable.
2. Solder cable box to the extension cable
3. Connect sensor cable and extension cable.
4. Connect extension cable in accordance with the connection circuit diagram.
[mm2]
[mm
0.25 – 2.5 single-strand
2
]
0.25 – 1.5 multi-strand
Appendix
Tightening torques
Tightening torque [Nm] for screws with metric threads + head contact surfaces With thread measured
in inches
+ wedge lock
washers
Rust-
8.8 +
5.6
Thread
M 3 0.6 1.5 – 1.2 1.5 1.1 – – G 1/8" 13
M 4 1.4 2.9 4.1 2.3 3 2 – – G 1/4" 30
M 5 2.7 6.0 8.0 4.8 6.0 3.9 3.5 4.7 G 3/8" 60
M 6 4.7 9.5 14 7.6 10.3 6.9 6 8 G 1/2" 80
M 8 11.3 23.1 34 18.4 25 17 16 22 G 3/4" 120
M 10 23 46 68 36.8 47 33 32 43 G 1" 200
M 12 39 80 117 64 84 56 56 75 G 1 1/4" 400
M 14 62 127 186 101 133 89 – – G 1 1/2" 450
M 16 96 194 285 155 204 136 135 180
M 18 133 280 390 224 284 191 – –
M 20 187 392 558 313 399 267 280 370
M 24 322 675 960 540 687 460 455 605
8.8 10.9
Alu*
8.8
proof
A4-70
Stainless steel
screws A2 and A4
Property
class 70
Property
class 80
Screw plugs with
elastomer seal
Thread
* Reduced tightening
torque when screwing
into aluminum
Galvanized
+
stainless
steel
Tab. 2 Tightening torques
Operating Instructions OIO 14en Edition 07/2017 53
Contents of the EC Declaration of Conformity
Appendix
Contents of the EC Declaration of Conformity
The flowmeters described in these operating instructions are machinery in the sense of the Directive
2006/42/EC. The original of the EC Declaration of Conformity is enclosed with the machinery at delivery.
The machinery fulfills all the relevant provisions of the following directives:
Number Name Remark
2006/42/EC Machinery Directive –
2014/68/EU Pressure Equipment Directive –
2014/30/EU Directive on Electromagnetic
Compatibility
2014/35/EU Low Voltage Directive Only for machinery with electrical
2014/34/EU Directive on Use in Potentially
Explosive Areas (ATEX)
Tab. 3 Directives observed
Only for machinery with electrical
components
components
Only for machinery in ATEX version
54 OIO 14en Edition 07/2017 Operating Instructions
Notes
Notes
Appendix
Operating Instructions OIO 14en Edition 07/2017 55
KRAL AG, Bildgasse 40, Industrie Nord, 6890 Lustenau, Austria,Tel.: +43/5577/86644-0
www.kral.at
KRAL AG, 6890 Lustenau, Austria, Tel.: +43 / 55 77 / 8 66 44 - 0, E-Mail: kral@kral.at
Fax: +43 / 55 77 / 8 84 33, www.kral.at, E-Mail: kral@kral.at
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