KROHNE CORIMASS MFM 4085 K/F User manual

02/98
CORIMASS G+ Class
Single straight tube mass flow meter
Installation and
Operating
Instructions
MFM 4085 K/F

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How to use these installation and operating instructions
For easy reference these Instructions are divided into four parts.
Only Part A (page 3) is needed for installation and initial start-up.
All CORIMASS mass flowmeters of the G-Series are factory set to your order specifications.
Part A Install flowmeter in the pipeline (Sect. 1), connect up (Sect. 2) and power the
flowmeter (Sect. 3).
The system is operational
Part B Operator control and functions of the MFC 085 Signal Converter.
Part C Service and functional checks.
Part D Technical data, dimensions and measuring principle.
Product liability and warranty
The CORIMASS mass flowmeter MFM 4085 is designed for the direct measurement of mass
flow rate, product density and product temperature, and also indirectly enables measurement of
parameters such as total mass, concentration of dissolved substances and the volume flow.
For use in hazardous areas, special codes and regulations are applicable which are specified
in the special ”Ex installation and operating instructions” (supplied only with hazardous-duty
equipment).
Responsibility as to suitability andintended use of our instruments rests solely with the
purchaser.
Improper installation and operation of the flowmeters may lead to loss of warranty.
In addition, the ”general conditions of sale” forming the basis of the purchase agreement are
applicable.
If you need to return CORIMASS flowmeters to KROHNE, please complete the form on the last
page of this manual and return it with the meter to be repaired. Krohne regrets that it cannot
repair or check your flowmeter unless accompanied by this completed form.
CE / EMC Standards / Approvals
•The Corimass MFM 4085 with the MFC 085 signal converter meet the requirements of the
EU-EMC Directives and bear the CE symbol.
•The Corimass MFM 4085 K -Ex are approved as hazardous duty equipment to the
harmonised European Standards and to Factory Mutual (FM). Further details are given in the
”Ex” supplementary instructions provided only with hazardous-duty equipment.
CE
Technical data subject to change without notice

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Contents
Part AInstallation and Start-up 5 - 24
1. Installation in the pipeline 5
1.1 General principles 5
1.2 Installation Guidelines 5
1.2.1 Mounting location 5
1.2.2 Connecting pipes 6
1.2.3 Mounting figures 8
1.2.4 Installation factor 8
1.2.5 Standard flange sizes for the flow meter 9
1.2.6 Cross talk 10
1.2.7 Recommended piping for use with the G-Meter 10
1.2.8 Inner Pipe diameters of the G-Series 10
1.3 External Heating and Insulation 11
1.3.1 Insulation 11
1.3.2 Electrical Trace Heating 13
1.3.3 Hot Fluid or Steam Heating 14
1.3.4 Heating Up from Cold 15
2. Electrical installation 17
2.1 Location and connecting cables 17
2.2 Connection to power 18
2.3 Inputs and outputs 18
2.4 Connection of Remote Meters 20
3. Start-up 21
3.1 Factory set parameters 21
3.2 Initial start-up 22
3.3 Installation factor 22
3.4 Zero point adjustment 22
3.5 Programming the converter with a bar magnet 24
Part BMFC 085 Signal Converter 25 - 75
4. Operation of the Signal Converter 25
4.1 Operating and check elements 25
4.2 Krohne Operating Concept 26
4.3 Key functions 27
4.3.1 How to enter programming mode 28
4.3.2 How to terminate programming mode 28
4.4 Table of programmable functions 31
4.5 Reset / Quit Menu - Totalizer reset and status indication acknowledgement 41
4.6 Status messages 43
4.7 Menu variations for systems with other output options 44
5 Descriptions of functions 45
5.1 Zero point adjustment 45
5.2 Low Flow cutoff 47
5.3 Time constant 47
5.4 Programming the display for measurement values 48
5.5 Programming Numeric Data 51
5.6 Setting the current output 52
5.7 Setting the frequency / pulse output 55
5.8 Setting the process alarm output (status) 59
5.9 Setting the control input (binary) 61
5.10 Setting the system control 62

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5.11 Standby function 63
5.12 Density adjustment for maximum measuring accuracy 65
5.13 Specific gravity 69
5.14 User data 71
5.14.1 Programming the display language 71
5.14.2 Password protection of menus 71
5.14.3 Custody transfer protection code 72
5.14.4 Primary head type and tube parameters (CF1-5) 74
5.14.5 Location 75
Part CSpecial options, Functional checks, Service and Order numbers 76 - 95
6. Special options 76
6.1 Use in hazardous areas 76
6.2 Converter with non-standard output options 76
6.3 Concentration measurements 76
6.4 Converter with Smart / Hart communication option 76
6.5 Converter with RS 485 communication option 77
6.6 Custody transfer option 77
7. Functional checks 77
7.1 Test functions 77
7.1.1 Testing the display 77
7.1.2 Testing current output 78
7.1.3 Testing pulse output 78
7.1.4 Testing alarm output 80
7.1.5 Testing control input 80
7.1.6 Viewing temperature and strain 81
7.1.7 Viewing primary head signal conditions 81
8. Service and Troubleshooting 82
8.1 Threads and ”O” ring of the converter housing lid 82
8.2 Replacing the converter electronics 82
8.3 Change of operating voltage and power fuse F9 83
8.3.1 Replacement of power fuse F9 83
8.3.2 Changing the operating voltage 83
8.4 Turning the display circuit board 84
8.5 Turning the Signal Converter housing 84
8.6 Troubleshooting 85
8.7 Fault finding 88
8.8 Checking the Primary head 91
8.8.1 Compact Meter 91
8.8.2 Remote Meter 92
8.9 Status warnings 93
9. Order numbers 95
Part DTechnical Data, Measurement principle and Block diagram 96 - 104
10. Technical data 96
10.1 Measuring ranges and error limits 96
10.2 Primary head 97
10.3 MFC 085 Signal Converter 98
10.4 Block diagram of Converter MFC 085 101
10.5 Instrument data plate 102
10.6 Dimensions and weights 102
11. Measuring principle 104
12. Software History 104

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Part A Installation and Start-up
1. Installation in the pipeline
1.1 General principles
The MFM 4085 K/F CORIMASS mass flow meter provides high accuracy and excellent
repeatability. Narrow band pass digital filtering, and the mathematically modelled internal
primary head design provides exceptional immunity to external vibratory disturbances from
nearby process equipment. The accuracy of the flow meter is not affected by velocity profile.
The straight single tube means there is a very low risk of cavitation, and no air can be trapped
inside themeter. No back pressure is required at the outlet of the meter. As with all Coriolis
massflowmeters, the CORIMASS is an active device with its own energy source. A good
installation is essential for the high measurement accuracy.
The following installation guidelines are practical to implement, particularly if planned before the
CORIMASS is first installed. For further dimensions or connections, please refer to Section D,
Technical Data.
1.2 Installation Guidelines
1.2.1 Mounting location
For the G+ no special mounting requirements are necessary. However, good general
engineering practices for the installation of flow meters should still be observed.
¾ The meter can be installed horizontally, in an upward sloping pipeline or vertically. For best
results, a vertical installation with flow in an upward direction is recommended.
Figure 1
1.2.2 Connecting pipes
Flow
Flow
Horizontal mounting
Upward sloping installation
Vertical installation (recommended)
Flow

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¾ Avoid mounting the meter with long vertical drops after the meter. This could cause
siphoning and cause measurement errors.
Figure 2. Avoid long vertical drops
¾ Install meter at least 4 ×L downstream of pumps. (where L = length of the meter)
Figure 3
¾ Avoid mounting the meter at the highest point in the pipeline. Air or gas can accumulate
here and cause faulty measurements.
Figure 4
¾ The use of reducers at the flanges is allowed. Extreme pipe size reductions should be
avoided due to possibility of cavitation and gassing. One size up from smallest available
flange size is acceptable.
Figure 5
One size up from standard
> 4 ×L
Siphoning effect

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¾ The use of flexible hoses is allowed. For best results the meter should be supported by two
spool pieces and the hoses connected to these spool pieces. For low flow rates (less than
10%) secondary clamps may be required.
Figure 6
Note: See table on next page for information on supports for distances, L.
¾ To enable a good zero to be done, it is recommended that a shut-off valve be installed
downstream of the flow meter.
Figure 7
Figure 7
¾ Installing in a bypass
Figure 8
L L
Flow
Valve for zeroing flow meter
The second valve is recommended if the
pump is switched off to prevent back flow

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¾ Should it become necessary to support the pipework, the following guidelines should be
followed. Do not clamp the meter body or the process pipework closer than distance L, as
shown in the table below. Due to the weight of the 800 to 3000 G, the pipework should be
supported. Please note minimum support distances as per table.
Meter Size L (cm) L (inch)
10 G+
21 8,8
100 G+
35 13,8
300 G+
48 18,9
800 G+
48 18,9
1500 G+
48 (DN 50) 70 (DN 80) 18,9 (2”N.B.) 27,6 (3”N.B.)
3000 G+
48 (DN 80) 60 (DN 100) 18,9 (2”N.B.) 23,7 (3”N.B.)
¾ Connecting pipes may have bends between the meter and supports
Figure 9
¾ Fit valves, sensors, sight glasses, etc. outside the supports if possible.
1.2.3 Mounting fixtures
¾ The connecting pipework must be in a stress free condition.
¾ The meter should fit between the connecting pipe with perhaps 2 - 3 mm (1/8 inch) to spare.
It should not be necessary to force the pipes apart to fit meter. Flanges should be correctly
aligned.
¾ Tighten flange bolts evenly.
¾ Do not fit rigid electrical conduit to the converter housing.
¾ Do not fit supports or any fixtures to any part of the meter or connecting pipework between
meter and supports.
1.2.4 Installation factor
The installation factor feature is unique to the G-Series. This factor (found in menu 2.7.4) is a
dimensionless number between 0 and 999 which is an indication of how well the instrument is
installed and whether the product contained gas bubbles. This is a function of the amount of
energy required to excite the measuring tube to its natural resonant frequency. The auto zero
value (menu 1.1.1 or 3.1.1) should be as low as possible, typically less than 1% for normal
installations and less than 2% for extreme conditions.

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The following values are a guideline to a good installation:
With themeter filled with water, the values should be less than the figureindicated.
Meter Size Installation factor
Non Ex •Installation factor
Ex
10 G + 20 200
100 G + 10 150
300 G + 20 400
800 G + 20 300
1500 G + 30 300
3000 G + 40 400
•The higher installation factor for Ex instruments is due to the power limiting of the Zener
barriers in the Exciter circuit, and does not mean bad installation.
•Product with higher density or entrained gas will exhibit higher installation factors.
Use the following procedure to check the installation factor. Warm up the electronics for at least
30 minutes. Flush the meter with water or product to ensure that all trapped air has been
removed.
Key Display
Line 2 Display Line 2
→Fct. (1).0 OPERATOR
↑Fct. (2).0 TEST
→Fct. 2.(1) TEST DISP:
6 ×↑Fct. 2.(7).0 TEST: TRANSD:
→Fct. 2.7.(1) SENSOR A
3 ×↑Fct. 2.7.(4) INSTAL:FACT:
→Fct. xxx
Display of installation factor LEVEL
3 ×↵Fct. 2.7.(4) INSTAL:FACT
↵Display
Note: Terms in brackets are flashing on the display.
1.2.5 Standard flange sizes
The following is a list of flanges for the meters, which are supplied as standard.
10 G+
100 G+
300 G+
800 G+
1500 G+
3000 G+
DN 10 PN 40 / ½” ANSI 150
DN 15 PN 40 / ¾” ANSI 150
DN 25 PN 40 / 1” ANSI 150
DN 40 PN 40 / 1½” ANSI 150
DN 50 PN 40 / 2” ANSI 150
DN 80 PN 40 / 3” ANSI 150

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1.2.6 Cross talk
Multiple instruments of the same size installed in the same structure may cause a problem with
cross talk between the operating frequencies of the instruments.
If this type of installation is envisaged, please contact your nearest Krohne office or
representative for assistance.
Instruments of different sizes are normally not a problem. As a guide the following table of
frequencies are provided for information ( +/- 5 Hz ) :
10 G+ 100 G+ 300 G+ 800 G+ 1500 G+ 3000 G+
Frequency in air (Hz) 230 223 253 250 290 295
Frequency in Water (Hz) 224 203 219 194 205 210
1.2.7 Inner Pipe diameters of the G-Series
Inner Diameter 10 G+ 100 G+ 300 G+ 800 G+ 1500 G+ 3000 G+
[mm] 4.93 14.46 23.58 37.60 47.96 68
[inch] 0.19 0.57 0.93 1.48 1.89 2.68
Tube thickness [mm] 0.71 0.71 0.91 1.20 1.42 2.00
1.2.8 Sanitary Connections
The installation guidelines are the same for sanitary connections as for flanges up to the
300 G.
The 800 G, 1500 and 3000 G has a different requirement due to the weight of the meter. The
standard sanitary connectors are not capable of carrying the weight of the meter. As a safety
precaution Krohne has decided to ship the 800 G to 3000 G with extended spool pieces with the
customer-requested sanitary connectors on the ends.
The installation length is thus increased with this extra set of spool pieces. This has the
advantage of having the correct length and outside diameter of the pipe to enable secure
clamping and a vastly improved installation. Supports must be used on the extra spool piece
close to the sanitary connection.
All G+ meters with sanitary connections have stainless steel adaptor, which screw on each end
of the meter using seals between the adaptor and the meter. The standard seal material is
PTFE on 10 G+ and 100 G+, and Viton for all other sizes. Other materials are available on
request. It is important that the adaptors are properly tightened to ensure crevice free seal (see
table on the next page for correct torque tightening valves.