KROHNE CORIMASS P Series User manual

Version November 1996
CORIMASS P and E Series
Software Version P2.20
Installation and
Operating
Instructions
MFM 2081 K and F
MFM 3081 K and 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 P- and E-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 081 Signal Converter.
Part C Service and functional checks.
Part D Technical data and dimensions.
Product liability and warranty
The CORIMASS mass flowmeter MFM 2081 and MFM 3081 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 and intended 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 2081 and MFM 3081 with the MFC 081 signal converter meet the
requirements of the EU-EMC Directives and bear the CE symbol.
•The Corimass MFM 2081 and MFM 3081 K -Ex are approved as hazardous duty equipment
to the harmonised European Standards and to Factory Mutual (FM) (pending). Further
details are given in the “Ex” supplementary instructions provided only with hazardous-duty
equipment.
Technical data subject to change without notice

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Contents
Part A: Installation and Start-up 4 - 28
1. Instrument Description 5
1.1 The Corimass Measuring System 5
1.2 Mass Flow Sensor 6
1.2.1 Measuring Principle 6
1.2.2 Transducer MFS 2000 (P-Series) 6
1.2.3 MFS 3000 Transducer (E-Series) 7
2. Installation 8
2.1 General Principles 8
2.2 Installation Guidelines 9
2.2.1 Location of Corimass Transducer 9
2.2.2 Requirements of the piping system 12
2.2.3 Special remarks on the MFS 3000 15
3. Electrical Installation 17
3.1 Location and Connecting Cables 17
3.2 Connection to Power 17
3.3 Inputs and Outputs 18
4. Start-up 20
4.1 Factory Set Parameters 20
4.2 Initial Start-up 20
4.3 Installation Factor 21
4.4 Zero Point Adjustment 21
4.5 Programming the Converter with a Bar Magnet 22
4.6 Installation of the Converter MFC 081 F 22
4.7 Connection of Remote Mounted Version 23
4.8 Connection Diagram of Compact Version 28
Part B: MFC 081 Signal Converter - Software Version P2.20 29 - 76
5. Operation of the Signal Converter 29
5.1 Operating and Check Elements 29
5.2 Krohne Operating Concept 30
5.3 Key Functions 31
5.3.1 How to enter programming mode 32
5.3.2 How to terminate programming mode 32
5.4 Table of Programmable Functions 35
5.5 Reset / Quit Menu - Totalizer Reset and Status Indication Acknowledgement 45
5.6 Status Messages 47
5.7 Menu Variations for Systems with Other Output Options 48
6. Description of Functions 49
6.1 Zero Point Adjustment 49
6.2 Low Flow Cutoff 51
6.3 Time Constant 51
6.4 Programming the Display for Measurement Values 52
6.5 Programming Numeric Data 55
6.6 Setting the Current Output 56
6.7 Setting the Frequency / Pulse Output 59
6.8 Setting the Process Alarm Output 63
6.9 Setting the Control Input 65
6.10 Setting the System Control 66
6.11 Standby Function 67

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6.12 Density Calibration Adjustment 69
6.12.1 Water as the reference liquid 69
6.12.2 Process fluid as the reference liquid 69
6.13 Density - Special functions 71
6.13.1 Density - Special functions 71
6.13.2 Referred density (option) 72
6.13.3 Fixed density (option) 72
6.14 User Data 73
6.14.1 Programming the display language 73
6.14.2 Password protection of menus 73
6.14.3 Custody transfer protection code 74
6.14.4 Primary head type and tube parameters (CF 1 - 9) 76
6.14.5 Location 76
Part C: Special Options, Functional Checks, Service and Order Numbers 77 - 96
7. Special Options 77
7.1 Use in Hazardous Areas 77
7.2 Converter with Non-standard Output Options 77
7.3 Concentration Measurement and Special Density Options 77
7.4 Converter with Smart / HART Communication Option 77
7.5 Converter with RS 485 Communication Option 78
7.6 Custody Transfer Option 78
8. Functional Checks 78
8.1 Test Functions 78
8.1.1 Testing the display 78
8.1.2 Testing current output 79
8.1.3 Testing pulse output 79
8.1.4 Testing alarm output 81
8.1.5 Testing control input 81
8.1.6 Viewing temperature 82
8.1.7 Viewing primary head signal conditions 82
9. Service and Troubleshooting 83
9.1 Threads and “O” Ring of the Converter Housing Lid 83
9.2 Replacing the Converter Electronics 83
9.3 Change of Operating Voltage and Power Fuse F9 84
9.3.1 Replacement of power fuse F9 84
9.3.2 Changing the operating voltage 84
9.4 Turning the Display Circuit Board 85
9.5 Turning the Signal Converter Housing 85
9.6 Troubleshooting 86
9.7 Fault Finding 89
9.8 Checking the Primary Head 92
9.9 Status Warnings 93
10. Order Numbers 96
Part D: Technical Data and Dimensions 97 - 103
11. Technical Data 97
11.1 Primary Head 97
11.2 MFC 081 Signal Converter 99
11.3 Measuring Accuracy / Error limits 100
11.4 Dimensions and weights 101
11.4.1 Compact Systems - MFS 3081 K / MFS 2081 K 101
11.4.2 Remote Systems - MFS 3081 F / MFS 2081 F 102

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Part A Installation and Start up
1. Instrument Description
1.1 The CORIMASS Measuring System
The CORIMASS Measuring System uses the Coriolis principle for measuring the mass flow
rate of fluids with high accuracy.
When using this measuring principle, it is possible to measure the mass flow rate directly,
independent of any other parameters of the fluid, such as density, temperature, pressure,
viscosity, conductivity and flow profile. Homogeneously distributed small solid particles
(slurries) and gas bubbles have no noticeable effect on the measuring accuracy.
The CORIMASS mass flow rate system is of modular type design, comprising a transducer
and a converter. In the compact version MFM 2081 K / MFM 3081 K the converter is mounted
directly to the transducer; in the separate version MFM 2081 / MFM 3081 the transducer MFS
2000 / MFS 3000 and the converter MFC 081 F are connected to each other via a shielded
multi-conductor cable (figure 1). The MFM 2081 is also referred to as “P-Series,” and the
MFM 3081 is also referred to as “E-Series”. The measurement values of mass flow rate, total
mass and density are available.
Additional to the standard system for special requirements the following models are available:
−transducer with electric or liquid heating
−transducer with secondary containment or pressure relief
−hazardous duty model:
EEx ib II B or EEx ib II C (no electric heating!) are applied
−FM Class I, II, III, Div. 1 and Div. 2, Groups B-G (pending)
Compact Version Separate Version
MFM 2081 K MFM 2081 F
Transducer MFS 2000 plus Converter MFC 081 F
Shielded multi-conductor cable
Fig. 1 The CORIMASS Measuring System

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1.2 Mass Flow Sensor
1.2.1 Measuring Principle
Coriolis forces occur in rotating systems when accompanying bodies are moved toward or
away from the rotational axis. This is illustrated by the following simple set-up: a pipe tube
rotates with a constant angular velocity around the axis A - B (figure 2). The fluid particles
flow with the velocity v through the loop. Between the points C and D they move away from
the axis and therefore have to be accelerated from a smaller to a larger tangential velocity.
Respectively, the fluid particles have to decelerate reducing their tangential velocity between
points E and F. The opposing coriolis forces acting upon the two different parts of the pipe
loop are directly proportional to the product of the mass and the velocity of the fluid. They
cause the pipe loop to deform (DD’, EE’ and FF’ respectively) with respect to a rotating loop
filled with a flowing fluid.
Fig. 2 Coriolis force in a rotating pipe loop
Rotation does not necessarily mean the completion of full circular orbits. Short circular
segments suffice. In the event of oscillation, the deformation of the pipe loop sides oscillates,
too. The total change in the motion of the pipe loop caused by the mass flow can be detected
via inductive sensors. A signal directly related the mass flow rate of the fluid flowing through
the pipe loop is then generated after appropriate signal processing.
1.2.2 Transducer MFS 2000 (P-Series)
For greater sized mass flow meters it has proven to be of advantage for the fluid to flow
through two parallel measuring loops, which oscillate in opposite directions and with a phase
difference of 180°. This symmetrical arrangement of the loops and the stiffness of the bridge
(i.e. the pipe loop supports) suppress most disturbances caused by external equipment.
Figure 3 displays an optimised transducer of the MFS 2000 series designed for mass flow
measurement.
Fig. 3: Transducer MFS 2000 without housing

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The use of flow dividers with optimised flow properties combined with the application of
measuring tubes with a large tube cross-section ensures minimum loss of pressure. The
danger of cavitation in the specified measuring range is eliminated.
The use of thick-walled measuring tubes with a large cross-section exercises a further positive
effect. Due to the increase in the vibrating mass, the measuring system is less sensitive to
gas bubbles in the measured medium.
1.2.3 MFS 3000 Transducer (E-Series)
The CORIMASS MFS 3000 series is comprised of precision transducers for the measurement
of small fluid and gas mass flow rates with the range of 0.006 kg./min. to 33.3 kg./min. (0.013
lb./min. to 73.16 lb./min.).
In contrast to the CORIMASS P-series of instruments, the CORIMASS E-series is designed as
a single-tube system with the inherent advantages of a single flow path (see Fig. 4).
Fig. 4: MFS 3000 Transducer without housing
Due to its low-frequency tuned reference platform, the MFS 3000 is largely insensitive to
interference. The unit is characterised by a rugged transducer loop, which permits optional
measurements up to operating pressure levels of as much as 300 bar (4352 psig) depending
on model.
A further advantage of the E-series is its ease of maintenance and servicing.

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2. Installation
2.1 General Principles
The MFS 2000 and MFS 3000 CORIMASS mass flowmeters are capable of providing high
accuracy and excellent repeatability. The narrow band pass digital filtering, the dual parallel
tubes of the P-Series and the tuned reference platform of the E-Series provide exceptional
immunity to external vibratory disturbances from process equipment in the area. Furthermore,
the power of the CORIMASS with its dual driver design permits unsurpassed performance on
certain types of slurries and on liquids with gas bubbles. Both designs are self-draining when
installed vertically.*
As with all Coriolis mass flowmeters, the CORIMASS is an active device with its own energy
source. The MFS 2000 mass flow sensor should be mounted into and by a rigid supporting
piping system to avoid reflected resonant energy from adjacent piping and mounting structures
in order to take advantage of the high degree of precision built into the instrument (fig. 5). A
possible exception is mentioned in Section 2.2.2.
Fig. 5 Basic installation requirement
MFS 2000: rigid, stress free supporting of the transducer
The MFS 3000 transducer should be mounted by using two metallic clamps (supplied with the
flowmeter), which are secured to a rigid mounting surface, as shown. For optimum
performance these clamps should be positioned near the outboard ends of the transducer
support tubes. They should also be well aligned to prevent undue stress on the MFS 3000
transducer housing when the clamps are secured. Adjacent piping should be rigidly supported
and aligned with the transducer to avoid excess loading on the transducer process
connections(See Fig. 6). For connection to tubing, process tubing should also be secured at
appropriate locations (indicated by arrows in Fig. 6) to minimize vibration.
* Note: 1.5E requires aproximately 7°anti-clockwise rotation from vertical.

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Fig. 6: Installation MFS 3000
A good installation is the basis for the high measurement accuracy of the unit.
The following installation guidelines are practical to implement, particulary if planned before
the CORIMASS is first installed.
2.2 Installation Guidelines
2.2.1 Location of CORIMASS Transducer
Please ensure the following installation guidelines are adhered to as they are
absolutely
necessary
for good measurement results and trouble-free start-up.
The transducer can be installed in any position. However, when installed in a vertical position
the transducer is self-draining and allows gas bubbles to be readily purged from flowmeter
during flowing conditions (see Fig. 7a and 7b).

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Fig. 7a Vertical installation Fig. 7b Horizontal installation
Highest position in Pipeline
Avoid mounting the transducer in this position as gas bubbles may collect and remain in
measuring system causing incorrect measurements (see Fig. 8).
Fig. 8 Avoid highest position in pipeline