KROHNE G-MFM4085 User Manual

02/98

CORIMASS G+ Class

Installation and
Operating
Instruction s

Single straight tube mass flow meter

MFM 4085 K/F

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 t he G-S eries are fact ory set to your or der sp ecif ication s .
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 tota l mas s, concentration of dissolved substanc es and the volume flow.

For use in hazardous areas, special codes and r egul ations ar e applica ble wh i ch ar e spec i fied
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 p urch ase agreement a re

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

2

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 Pro gramming the display for meas uremen t 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

3

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 measure ments 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 conver ter el ectroni cs 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

4

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 the meter. No back pressure is required at the outlet of the meter. As with all Coriolis
mass flow meters, 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 Guidelin e s

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.

Flow

1.2.2 Connecting pipes

Upward sloping install ation

Vertical instal lation (recommended)

Flow

Figure 1

Horizontal mounting

Flow

5

¾

Avoid mounting the meter with long vertical drops after the meter. This could cause

siphoning and cause measurement errors.

Siphoning effect

Figure 2. Avoid long vertical drops

¾

Install meter at least 4 × L downstream of pumps. ( where L = length of the meter )

> 4 × L

Figure 3

¾

Avo id mounting th e meter at t he hig hest p oint in th e 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

6

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.

L L

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.

Valve for zeroing flow meter

Flow

The second valve is recommended if the
pump is sw itc hed off to pr event back flow

Figure 7

Figure 7

¾

Installing in a bypass

Figure 8

7

¾

Should it become necessary to support the pipework, the following guidelines should be

fol low ed. Do not clamp the meter body or the process pi pework clo ser than di stance 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

10 G+ 21
100 G+ 35
300 G+ 48
800 G+ 48

1500 G+ 48 (DN 50) 70 (DN 80)
3000 G+ 48 (DN 80) 60 (DN 100)

L (cm)

8,8
13,8
18,9
18,9
18,9 (2”N.B.) 27,6 (3”N.B.)
18,9 (2”N.B.) 23,7 (3”N.B.)

L (inch)

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.

8

The following values are a guideline to a good installation:
With the meter filled with water, the values should be less than the figure indicated.

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 followin g procedur e t o check th e i nstallation fact or. Warm up the electro nics for at l east
30 minutes. Flush the meter with water or product to ensure that all trapped air has been
removed.

Key Display

Line 2

→
↑
→
6 × ↑
→
3 × ↑
→

Fct. (1).0 OPERATOR
Fct. (2).0 TEST
Fct. 2.(1) TEST DISP:
Fct. 2.(7).0 TEST: TRANSD:
Fct. 2.7.(1) SENSOR A
Fct. 2.7.(4) INSTAL:FACT:
Fct. xxx

Display
Line 2

LEVEL

Display of installation factor

3 × ↵

↵

Fct. 2.7.(4) INSTAL:FACT
Display

Not e: Terms in bracket s are flashing on the displ ay.

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

9

1.2.6 Cross talk

Mul tiple instruments of th e sam e si ze installed in the same structure m ay 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.

Instrument s of dif ferent sizes are nor mall y not a p r obl em . 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.

10

METER

SIZE

SIZE & TYPE

Seal is

modelled on:

STD.

MATERIAL

TYP.

TORQUE

Nm

KFTC part/drawing ALTERN.

MAT.

10 G ½” Tri-clamp PTFE 18 3.85055.00 .00 None
100 G ¾” Tri-clamp PTFE 16 3.85155.00.00 Nitrile

+

Silicone
EPDM

+

Viton

+

+

300 G 1” IDF/ISS Viton 8 5.85065.00.00 Nitrile

EPDM
PTFE

800 G DN40

DIN11851

Viton 27.5 5.85117.00.00 Nitrile

EPDM
Silicone

1500 G 2” IDF/ISS Viton 24 5.85162.00.00 Nitrile

EPDM
PTFE

Installation lengths for sanitary connections - please contact Krohne for further details as
installation lengths depend on customer requirements.

• Typical Torque on request.

TYP.

TORQUE

Nm

8

•

•

8
9

•

11.5

•

24

•

26

•

39.5

1.3 External Heating and Insulation

When installing the G+ Meter in heated and insulated pipelines, it is not generally necessary or
desirable to heat or insulate the case of the meter. This is because t he central measuring tube
is not thermally coupled to the case, except at the extreme ends. It is then only necessary to
insulate the flanges as shown in the attached drawings. However, it is permissible to insulate
the case of G+ Meters and special units with heating jacket s are a vail able.

The fo llowi ng notes will a ct as a gu ide fo r use of t he G+ Met er wit h diff erent t ypes of heati ng
and insulation systems. Please note that freezing of the product within the meter cannot
damage the meter.

1.3.1 Insulation

It is recommended that the pipework and insulation material be installed as in figure 10. The
ins ul ati on ca n b e Rubb er, Foam , G las s Fi br e or a ny ot her pro ces s su it abl e mat eri al . It s houl d,
however, be firmly fixed with no components such as straps or covers that can vibrate.

Figure 10

Insulation Principle

11

Notes:

1. Insulation Material: Rubber, Foam, Glass Fibre, or any other process suitable material.

2. Insulation must be firmly fixed to the pipework.
If especially desired by the customer, it is permissible to insulate the meter itself. If this is

required, then the following guidelines should be followed.
The insulation must be firmly fixed to the meter with no components such as straps or covers

that can vibrate (figure 11). DO NOT insulate converter (figure 12).

Figure 11

Important No te:

When insulating Ex meters, insulation must not rise above the square plate that connects the
sensor and converter (figure 12).

Figure 12

In addition, any heat tracing used (electrical or fluid) must not exceed 130°C for titanium meters
(optional 150°C). For zirconium meters maximum temperature is 100°C. The Ex temperature
cl asses are also different , see table below.

12

Ex Temperature Classes for Insulated/Heated Meters

Process Temperature Temperature Class

65°C T5
100°C T4
130°C T3

Optional 150°C T3-T1
If remote meters are insulated (see figure 13), it is imperative that the insulation does not rise
above the square plate mentioned above and a thermal insulation adapter must be purchased
from Krohne and fitted as shown.

Figure 13

1.3.2 Electrical Trace Heating

The use of electrical heating tape is illustrated in figures 14,15,16 and 17. The use of self­limiting tape is ideal, but other types of electrical heating may be used. Any thermostat should
be fitted to the adjacent pipework, if this is done it should be firmly fixed with no loose wires or
connections that could vibrate. If only pipework and flanges are insulated, two turns of heating
tape should be tightly applied to the flanges and covered in insulation as shown. All heating
tapes should be tightly fixed with no areas that could vibrate. Between the flanges the heating
tape should be secured to the converter neck, but insulated from it (figure 16) or run back to the
first clamp and then in a loop to the opposite clamp (figure 17). Krohne can supply a list of
electrical heating tape suppliers, if required. If the meter case is insulated then heating tape
may be applied tightly under the insulation. It is recommended that the heating tape be applied
axially and continuously taped down (figure 15).

Figure 14

Figure 15

Figure 16

13

The converter must not be insulated or heated. For Ex meters refer to ‘important note’ in
‘Insulation’ section above.
In all cases, the installation factor should be monitored and maintained within the normal
levels.

Figure 17

1.3.3 Hot Fluid or Steam Heating

Where pipelines are jacketed with concentric pipes, carrying a hot fluid such as water or steam,
follow the following recommendations.
The jacket should be of as small a diameter as possible and the wall thickness should be as thin
as possible (figure 18).

A radial gap between the process pipe and the inside of the jacket of 5-6mm is suitable.
The minimum clamping distance is increased (figure 18). The first clamp should be moved

further away from the meter.
It i s an advant age t o avoi d proc ess pipewo rk of a large diamet er comp ared to the meter bore.
Krohne can provide further guidelines and dimensions of suitable pipes and jackets.
The jacket must be completely filled with no air pockets present.
Any clamps or supports must be applied at a distance greater than L.

Figure18

14

Also availa ble are special jacketed meters as s hown in fi gure 19. These are also Ex app roved .
Remote jacketed meter must be fitted with an insulation adaptor shown in fig. 13.

Figure 19

In all ca s es, the installat io n fa ctor sh ould be moni to red and m aintain ed wit hin normal levels.

1.3.4 Heating Up From Cold

The proceeding insulation and heating instructions also apply in this case, together with the
following notes:

The low thermal coupling between the Titanium tube and the flanges means that maintaining a
G+ Meter at a desired temperature is straight forward as already described, however, heating
from cold an uninsulated meter can be a lengthy process, particularly if the customer’s product
could be damaged by high rates of heat input at the flanges. The areas at each end of the
meter can be heated from 20°C to 60°C in about 2 hours, but the centre of the meter can take 5
hours to reach this temperature particularly if the product has solidified. It is possible to speed
this up if the meter is mounted vertically and a reduction of abou t an hour is possible, if the case
is insulated. If the case is also heated, heating times are further cut.

The above comments assume that there is no flow through the meter. If there is flow through
the meter then the desired temperature can be reached within a few minutes.

Another important fact to note, is that it is rarely necessary to fully melt all the product which has
solidified in the meter, as it has been demonstrated that any ‘plug’ of product can be pushed
through the meter by pumping pressures of less than 1 bar. Any ‘plug’ would be rapidly melted
in the joining pipework. This fact is an important benefit of the single straight tube design and is
not true of bent tube meters, or meters with flow dividers and multiple tubes.

Temperature Note

Most work in this subject has considered product temperature up to 80°C, if higher
temperatures are required by the customer the proceeding guidelines still apply, but heat up
from cold times will be extended.

The G+ Met ers ha ve maximum o perating t emper atures, as foll ows:
Zirconium Tubes 100°C

Titanium Tubes 130°C
Titanium Tubes (to special order) 150°C

15

On Titanium tube meters, it is, however, possible to exceed 150°C up to an absolute maximum
of 200°C, for short periods. The time is limited by the initial temperature and final temperature.
To assess the time allowable, refer to figures 11,12 and 13, which cover the 10G+, 100G+ and
300G+ meters. For the 800G+ and 1500G+ refer to Krohne Ltd.

This does not apply to the 3000G+. These meters must not exceed 130°C. Zirconium tube
meters must never exceed 100°C.

ALLOWABLE TIME AT HIGH TEMP .

10 G METER

130
120
110
100

90
80
70
60
50

TIME MIN.

40
30
20
10

0

120 130 140 150 160 170 180 190 200

Initial temp 30 C

Initial temp 70 C

Initial temp 120 C

TEMP. C

ALLOWABLE TIME AT HIGH TEMP.

120
110
100

90
80
70
60
50

TIME MIN.

40
30
20
10

0

120 130 140 150 160 170 180 190 200

100G METER

TEMP. C

Initial temp 30 C
Initial temp 70 C

Initial temp 120

16

ALLOWABLE TIME AT HIGH TMP.

120
110
100

90
80
70
60
50

TIME MIN.

40
30
20
10

0

120 130 140 150 160 170 180 190 200

2. Electrical installation

2.1 Location and connecting cables

300G/ 800G METER

Initial

Initial

Initial

TEMP. C

Location

Do not expose the compact flow meter to direct sunlight. Install a sunshade if necessary.

Connecting cables

To conform to protection category requirements, observe the following recommendations:
– Fit blanking plug PG 16 and apply sealant to unused cable entries.

– Do not kin k cabl es directly at ca ble entries.
– Provide water drip point (U bend in cable).
– Do not connect rigid conduit to cable entries.
– If c ables are a tight fit, enla r ge in side diameter o f cable gland by removing t he appropriate

ring(s) from the seal.

17

2.2 Connection to power

Please ensure that the information about power given on the
data plate corresponds to the locally ava ilable mains voltage.

– Note information given on the instrument data plate (voltage, frequency)!
– Electrical connection in conformity with IEC 364 or equivalent national standard.

Special regulations apply to installation in hazardous areas. Please refer to separate "Ex"
insta llat io n in struction s .

– The PE protective ground conductor must be connected to the separate U-clamp

termin al in t he terminal box of the signal converter.

– Do not cross or loop the cables in the terminal box of the signal converter. Use separate

(PG or NPT) cable glands for power and output cables.

– Ensure that the screw thread of the round cover on the terminal box is well greased at all

times.

NOTE: The grease used must be non-corrosive to aluminium; typically it must be resin- and

acid-free.

– Protect sealing ring from da mage .

5 6 4 4.1 4.2 11 12

N L AC

+ DC

Outputs and
connections
see S ect. 2.3

–

PE

Power and signal connections for MFC 085 K

2.3 Inputs and outputs

The table below shows the input/output connection for the converter. The exact configuration
depends on which optional output modules were fitted in the factory.

Table of input/output connections

Trm.
No.

5 Common (-) Common (-)
6 Current output (+) Curr ent output 1 (+)
4 Control input Control input.

4.1 Pulse output Current output 2 (+)

4.2 Status out put (active) Sta tus ou tput (pas sive)

* The inputs/outputs share a common signal ground that is galvanically isolated from ground

(PE).

Option 1

(Current, pulse, status

output and control input )

Option 2

(2 current,NGI

status ou tp ut )

*

18

For the standard converter, the pulse output is passive and requires an external voltage
source for operation. In addition, the signal may need protection from external electrical
interference. The use of screened cables and a filter capacitor next to any counter is
recommended. (Fig. a)

It is possible to connect the pulse output without using an external voltage supply. However to
do this the function of the alarm output must be sacrificed. (Fig. b).
If the alarm o utput is used to power the pu lse signa l then the followin g settings must be made
in the menus.

(i) Fct. 3.5.1 ALARM FUNCTION must be set to OFF
(ii) Fct. 3.5.2 ALARM ACTIVE LEVEL must be set to ACTIVE LOW.

(Max. 24 V DC)

V

ext

150 mA)

(

≤

R

ext

Fig. a Pr eferred connections to an external counter with separate power supply
(Example). For correct wiring see table of Input/ output connections

Fig. b Connection without external voltage source (Example). For correct wiring see

table of Input/ output connection

19

Additional input/output options

Tr

Opt ion 4*

(Current an d

m.

RS485)

No.

5 Common

(-)

6 Current

output 1 (+)

4 TX/RX TX/RX Control Input Current

4.1 TX/RX TX/RX Pulse

4.2 +5V +5V Pulse

Opt ion 5*

(Current an d
Modbus)

Common
(-)

Current
output 1 (+)

Option 6

(1 Current,
1 Dual
phase pu lse
output an d
control
input)

Common
(-)

Current
output 1 (+)

Output A

Output B

Option C

(2 current,
pulse an d
control
input)

Common
(-)

Current
output (+)

output 2 (+)
Control Input Current

Pulse
Output

Option D

(3 current
and

pulse)

Common
(-)

Current
output 1 (+)

Current
output 2 (+)

output 3 (+)
Pulse output Control Input status output

Option E

(3 current
and

control
input)

Common
(-)

Current
output 1 (+)

Current
output 2 (+)

Current
output 3 (+)

Option F

(3 current
and

status
output)

Common
(-)

Current
output 1 (+)

Current
output 2 (+)

Current
output 3 (+)

(passive)

The p uls e out alarm ou tputs where sel ected are passi ve.
* Refer to separate RS 485 or Modbus manual

2.4 Connection of remote meters

The G meter can be supplied as remote meter with 5 m cable. Under no circumstances should
the cable be cut shorter or joined to increase its length. The meter is calibrated with this 5m
length. Any changes will influence the performance of the meter.

There are two di fferent conf igurations of remote meter, on the firs t vers ion the cable is fixed at
the converter end and the second has a terminal junction box at the converter end.

50

145

115

20

The connection on the transducer end is done for both versions over a special connector. On
the fixed version the connection on the converter side is fixed. The second option uses a
junction box for the connection. Wiring is done according to the following figure. PG 16 or ¾”
NPT adaptor are available with the junction box version to put the cable into flexible conduit.

3. Start-up

3.1 Factory Set Parameters

The mass flow meter leaves the factory ready to be used. All process data has been
program med a ccor ding to the c ustomer order. See factory programming s heet d elivered with
the flow meter.

When no process details were supplied at the time of order, the mass flow meter is programmed
to a standard default set of values and functions.

The current and pulse outputs treat all flows as positive. The actual flow and quantity is thereby
measured independent of the flow direction. The indicator will indicate a ” – ” or ” + ” in front of
the flow rate.

These factory-set settings for current and pulse may cause an error under the following
conditions: When the pump is stopped and a reverse flow is present, which is larger than the
low flow cut-off or when totalizing should be indicated for both flow directions.

To a void these poss ible prob lems:
a) Set fl ow mo de (Fc t . 3.1.8) to either fl ow > 0 or Flow < 0, so that rever se fl ows are igno red.

or
b) Increase Low Flow cut-off (Fct. 3.1.7) so that small reverse flows are ignored.
or
c) Set the alarm outp ut (Fct. 3.5.1) to DIRECTION s o t hat extern al eq uipment c an dif ferentiate

between positive and negative flows.

21

3.2 Initial Start-up

• Please check that the power supply corresponds to the information supplied on the data
plate.

• Switch on the power supply.

• On switch-on, the signal converter first carries out a self-test. The following sequence is

displayed:

TEST

10 G GX.XX

Pri mary Head S oftware V ersion

STARTUP

Mass flow will be displayed following a brief settling phase for the primary head.

A minimum warm-up time of 30 minutes is recommended to
ensure stable measurement operation.

• For stable and accurate mass flow results the following should be checked:

a) The quality of the mechanical installation. See Sect. 1.2.2.
b) A good zero point calibration should be done. See Sect. 3.4. Further information

regarding zero point calibration can be found in Sect. 5.

3.3 Installation factor

The extensive self-diagnosis functions of the MFM 4085 also include a so-called installation
factor. This factor indicates whether the flow meter has been correctly installed in the pipeline
and whether the mounting supports have been fitted at defined points. For that reason, the
installation factor must without fail be checked during the initial start-up phase. The installation
factor can be checked by way of the keystroke combination as in Sect. 1.2.3.

If corr ectl y install ed, the val ue of the installation facto r when the pr imar y head is full of water
should be as per table in section 1.2.3. If the figure is higher, the specified accuracy of the flow
meter cannot be guaranteed. Please check the installation again on the basis of the installation
information (Sect. 1.2). If necessary adjust clamping with the meter displaying the installation
factor to obtain optimum performance.

3.4 Zero point adjustment

After installation adjust the zero point. To do this, the primary head must be completely filled
with the liquid product without gas or air inclusions. This is best obtained by allowing the
liquid product to flow through the primary head for approx. 2 minutes at a throughput rate of
greater than 50% of rated flow. Subseque ntly ensure tha t flow co mes to a complete stop in the
primary head (see fig 10, Section 1.2) for setting the zero without interruption to product flow,
use a bypass set-up as shown in fig. 11 (Section 1.2). For best results the zero adjustment
should be performed with the front cover in place. To activate the calibration, use the bar
magnet provided to operate the magnetic sensors on the display.

22

Now initiate zero adjustment by way of the following keystroke combination:
Start from measuring mode

Key Display

line 1 line 2

→ Fct. (1).0 OPERATOR

2x→ Fc t. 1. 1.(1) Z ERO SET

→ (MEASURE.VAL.)
↵ CALIB. (NO)
↑ CALI B. ( YES)
↵ X.X PERCENT

ACCEPT (YES)
↵ Fct. 1.1.(1) ZERO SET
3x↵ ACCEPT (YES)
↵ Display

Under certain conditions, it may not be possible to adjust the zero point:
– If the medium is in motion. Shut-off valves not tightly closed.

– If there are gaseous inclusions in the primary head. Flush the primary head and repeat the

calibration.

– If resonant oscillations of the piping are interfering with the primary head. Check the

clamping of the in strument.

– If there ar e active warning(s ) in the status m es sage list. (See section 4.6)
In such cases, the zero point adjustment procedure is automatically aborted and the following

message is displayed for a short time:

ZERO.ERROR

Then the converter returns to the start of the function 1.1.1:

Fct. 1.1.1 ZERO SET

Further information on zero point adjustment is given in Section 5.
The CORIMASS MFM 4085 is ready to operate after zero has been adjusted.
All parameters have been fa ctory-set in keepin g with the data s pecified in your ord er. Detailed

information for further setting of the signal converter will be found in Part B of the operating
instructions.

23

3.5 Programming the converter with a bar magnet

• The converte r can be programme d by mean s of the magnet ic se nsors moun te d on the
faceplate without removing the front lid.

• To do this, a bar magnet (standard supply) is used to activate the sensors by holding the
magnet close to the glass window of the housing lid.

• These sensors then duplicate the functions of the push buttons.

24

Part B MFC 085 Signal Converter

4. Operation of the Signal converter

4.1 Operating and check elements

The o perating elements are accessibl e after removing the c over of the elect ronics section usi ng
the special wrench. The converter is also programmable with magnetic sensors and a bar
magnet without removing the covers of the electronic housing.

Caution:

The operator control concept consists of three levels (horizontal). See next page.

Setting level:

Parameter check level: Fct. 4.0 PARAM.ERROR

Reset/acknowledge

level (Qui t):

Do not damage the screw thread and the gasket, never allow dirt to accumulate,
and make sure they are well greased at all times.

① Display 1st (top) line
② Display 2nd (middle line
③ Display 3rd (bottom line:

arrows (τ) to identify the state
of the signal converter

Status

–
–

④ Keys for operator control of the

signal converter.

⑤ Magnetic sensors to set the

converter by means of a
handheld bar magnet without
opening the housing. Function
of sensors same as keys ℘.

⑥ Compass field, signals

actuation of a key.

This level is divided into three main menus:

Fct. 1.0 OPERATION

important parameters and functions of Menu 3 (install) to allow
rapid changes to be made during the measurement mode.

Fct. 2.0 TEST

(displays, outputs, measuring range).

Fct. 3.0 INSTALL

parameters and functions can be set in this menu.
After exiting from the ”Sett ing l evel”, th e sign al convert er ch ecks

new data for plausibility. If an error is detected, the signal
converter indicates PARAM.ERROR in Fct. 4.0. In this menu, all
functions can be scanned and those changed that are not
”plausible”.
This menu has two tasks and is selected via Entry Code 2
( ↵ ↑ → )

1) Resetting of totalizer, provided that resetting is enabled under
Fct. 3.8.5 ENABL.RESET, input YES.

2) Status message and acknowledgement (Quit) messages that
have occurred since the last acknowledgement are indicated in
a list. After elimination of the cause(s) and acknowledgement,
these mes sages are deleted from th e list .

: Test menu for checking the signal converter

: This menu contains only the most

: All flow measurement- and flowmeter-spe cific

: This leve l is not se lectable.

message indicator

Standby

mode

25

4.2 Krohne Operating Concept

26

4.3 Key functions

Function of the keys

Cursor

The location of the cursor on the display is indicated by flashing characters. This
cou ld be a sing le digit when entering number; numeric sig n ( + or -) ; meas ure-ment
units (g,kg,t etc.); or any other text field. Throughout this manual the location of the
cursor, in programming examples, will be indicated by parentheses ( ) around the
flashing characters.

↑ Select or Up Key. This key changes the field/digit under the cursor.

- Digit: Increase value by 1 for each key press. (0 follows 9).

- Dec. pt. Move decimal point. 0000(.)0000 changes to 00000(.)000

- Menu Increase menu number by 1. i.e. Fct. 1.(1).0 changes to
Fct. 1.( 2 ).0
When the menu number reaches its maximum the next ↑ changes the
number to 1. i.e. Fct 1.(5).0 changes to Fct 1.(1).0

- Text Change text field. i.e. ”YES” to ”NO” or ”g” to ”kg” to ”t” etc.

- Sign Toggle ”+” to ”-”

→

Cursor or Right Key. This key moves the cursor onto the next field to be edited.
(usually the next on the right).

- Number Move cursor from 12(3).50 to 123(.)50 to 123.(5)0

- Text Move to next field. i.e. (kg)/min to kg/(min)

- Menu Move to next menu column: i.e. from Fct 1.(2).0 to Fct. 1.2.(1)
or
if the cursor is already in the rightmost column: invoke that menu
function. i.e. from Fct. 1.2. (1) press → to edit MASS FLOW format.

↵ Accept or Enter Key.

-Within a

Accept changes (if any) and exit the function.

function

-Menu Move cursor to the next column on the left.
i.e. from Fct. 1.2.(1) back to Fct. 1.(2).0
If the cursor is already in the leftmost column then ↵ exits the menus.
See next box: ”To terminate” .

Note:

If numerical values are set that are outside the permissible input range, the display shows the
min. or max. . accept ab l e val ue. After pr ess i ng the ↵ the numb er m ay b e c orr ec ted.

27

4.3.1 How to enter programming mode

To start:

Display Comments

→ Pres s Fct . 1.0

If this appears, see next box: ”Function of the keys ” .
Operation
or

CodE 1

---------

If this appears on the display, set the 9-keystroke Entry

CodE 1 .

Factory setting: → → → ↵ ↵ ↵ ↑ ↑ ↑

1st- 8thplace
(key)

9th place
(key)

CodE 1
∗∗∗∗∗∗∗∗-

Fct. 1.0
Operation

CodE 1
(9 alpha

Each keystroke acknowledged by " ∗ " in display.

If this appears, see box: ”Function of the keys ” below.

A wrong Entry CodE 1 was keyed in. Press any key and set

the correct 9-keystroke
characters)

4.3.2 How to terminate Programming mode
To terminate:

Press ↵ 1-3
times

↵ + 12.345

Fct (1).0
OPERATOR

kg/min

Press ↵ 1-3 times until the cursor is under the extreme
left menu column. (Fct. 1.0 , 2.0 or 3.0)

If no changes have been made to the system’s configu­ration return directly to the measurement mode.

or
(ACCEPT YES) Changes have been detected. Press ↵ to accept these

changes.
or

↑

(ACCEPT NO)

Press ↵ to reject changes and return directly to
measurement mode.
or

↑

(GO BACK)

Press ↵ to return to the menus, Fct. 1.(0) to make
further changes

↵ PARAM.CHECK Assuming ACCEPT YES was selected,

the system now checks the new setting for errors.

After 1-2 sec. + 12.345

No errors detected. Return to measurement mode.

kg/min

or
Fct. (4).0
PARAM.ERROR

Errors were detected. The sub-menus of 4.0 will guide

the operator to those functions where problems have

been identified.

28

Examples

The cursor (flashing part of display) has a grey background in the following examples:

To start programming

Measurement mode Programming mode

13.571

→

Fct. 1. 0

m3 / h r OPERAT I ON

PLEASE NOTE: When ”yes” is set under Fct. 3.8.2 ENTRY CODE, the following will

appear in the display after pressing the → key:

CodE 1 - - - - - - - - -.

The 9-stroke entry code must now be entered.
Factory setting: → → → ↵ ↵ ↵ ↑ ↑ ↑.
Each keystroke is acknowledged by an ” ∗ ” in the display.

To terminate programming

Press ↵ key repeatedly until one of the following menus are displayed:

Fct. 1.0 OPERATION, Fct. 2.0 TEST or Fct. 3.0 INSTALL

Press ↵ key

Fct. 3. 0

INSTALL. A C C E P

↵

T.

Y E S

To accept the new parameters

Press ↵ to confirm.
”PARAM.CHECK” will appear in th e displa y.

The measuring mode will continue after a few
seconds with the new parameters, when no
errors are detected.

When an error is detec ted the di spla y will
indicate ”Fct. 4. 0 PARAM.ERROR”. The error
parameters can be called up in this menu and
corrected.

New parameters not to be accepted

When the new param eters are no t to be
accepted, the following keystrokes should be
executed: Press ↑ key. The display will
show ”ACCEPT NO”. When the ↵ key is
then pressed, the instrument will return to the
measurement mode using the old parameters.

29

To change numeric values

Increase numeric value

210. 5 0

↑

210.6 0

kg/mi n kg/mi n

To move the cursor (flashing digit)

To move to the right

210. 6 0

→

210.6 0

kg/mi n kg/mi n

To move the decimal point

To move to the right

21. 060

↑

210. 6 0

kg/mi n kg/mi n

To change the text

Select next text

↑

M A S S F L O W D E N S I T Y

To change the units

Numeric v alues autom aticall y c onv er t ed

Select new unit

0.21060

↑

210.60

g /min k g /min

Alternative time unit

210. 60

→

k g /min kg/m i n

To change from numeric values back to text

Alternative engineering units

210. 60

→

kg/mi n k g /min

Return to function display

10.3

↵

Sec TIMECONST.

30

210.60

210.60

F c t. 1. 1. 3