KROHNE G-MFM4085EEx User Manual

03/99

CORIMASS G-Class

Enclosure to
Operating Manual
for
Ex Instruments

MFM 4085 K/F

IMPORTANT!

These instruct i ons should be used in conjunc tion with the Standard Installation and Operating
Instructions for the MFM 4085 K/F.
If you have not received a copy or require a copy, please contact your nearest Krohne Office or
representative or Product Management in Duisburg, Germany.

Product liability and warranty

The CORIMASS mass flowmeter MFM 4085 is desig ned for the direct measurem ent 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.

use in hazardous areas

For

, 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 com ple te the for m on the

last

page of the Installation and Operating manual and return it with the meter to be repaired.
Krohne regrets that it cannot repai r or check your flowmeter un less accom pani ed by this
completed form

.

2

Contents

1. Description 4

1.1 Description of th e Transducer 5

1.2 Description of the Converter 5

1.3 Installation of th e MFM 4085 K E

Ex 6

2. Electrical Installation 7

2.1 Location and connecting cables 7

2.2 Connection on c onverters without in trinsically sa f e outputs 7

2.3 Connection on c onverters with intrinsically safe outputs 9

2.3.1 Technical information Intrinsically Safe Outputs 10

2.4 Overview PTB and FM Approvals 11

3. Certification (without images) xxxx12

4. Data Plates 61

4.1 Ex PTB 61

4.2 Ex PTB with Custody Transfer 61

4.3 Ex PTB with intrinsically safe output s 62

4.3 FM Class I Div 1 63

4.4 FM Class I Div 2 63

3

1. Description

The mass flowmeter MFM 4085 K E

Ex and MFM 4085 F EEx consists of two main components:

The Signal Converter, whic h calculates and displays the m easured values an d the transduce r
which supplies the converter with the analog sign al s.

A Cable Seal, which is s crewed into the converter housing, lead s the electric s i gnals from the
transducer to the converter. The signal cable between the transducer and converter are
intrinsically safe.

The converter hous i ng is permanen t ly screwed onto the transducer and mu st not be removed
at any time.

Cenelec Approvals

PTB approves the conformity of the mass flow meter acc. to the harmonized European
Standards:

EN50018

(Pressure tight housing ‘d’)
for the electr onics housing and the term i n al com partment

EN50019

(Increased safety ‘e’)
for the standa rd termination compartment

EN50020

(Intrinsically Safe ‘ib’”
for the Zener bar ri ers and all el ectrical circuits inside the transducer

The approval number PTB Ex-94.C. 2054 X, PTB Ex-97.D.2194 X, Ex-97.D.2195 X and the
Addendums covers the meter sizes 10 G, 100 G, 300 G, 800 G, 1500 G and 3000 G.
The meters are identified with the code E
E
or with intrinsic. safe outputs E
E

Ex de [ib] II C T6...T3 or
Ex de [ib] II C T6...T3
Ex de [ia/ib] II C T6...T3 or
Ex de [ia/ib] II C T6...T3

Factory Mutual approvals

The G-Series is also approved for use in Div 1 and Div 2 hazardous locations.
The equipment is suitable for us e i n the following area s:

Class I Div 2 Groups A, B, C and D
Class II Div 2 Groups F and G
Class III Div 2
Class I, II, III Div 1 Groups A, B, C, D, E, F and G

The approvals and the various addend ums is applic able to the meter si zes: 10 G, 100 G, 300
G, 800 G,1500 G and 3000 G.

4

1.1 Description of the Transducer

The transducer MFS 4000-Ex is an intrinsically safe unit and contains three separated safe
circuits. These ar e:

−

Driver Circuit

− Sensor Circuit

−

PT500 / Strain Gauge Circuit

The cables of these circuits are fed through the transducer housing via a special seal. There
are various transducer sizes available with different end connection options. Although standard

E

x transducers appear the same, in fact the EEx version has a longer converter mount

and E
(neck) and also contains specific clamping diodes fitted across the driver coil. Therefore, it is
essential to

avoid

using a standard converter with E

Ex transducer and vice versa.

In order to fulfil the Ex certification requirements, it is absolutely necessary to comply with the
technical data which is enclosed in this document. Under no circumstances should the process
fluid exceed 130°C, optional 150°C ( for instruments with zirconium tubes the max. temp. is
100°C) .

1.2 Description of th e Converter

The Ex converter is available in two different versions:
a) The ‘de’ versi on
The electronics are placed in a pressure tight section of the converter housing, while the

termination compartment is not pressure tight. The converter housing may be fitted with
different cable glands such as NPT, PG16 or NPF gl ands for the mains supply and the
input/output cables. The protection class of the termination compartment in ‘e’.

b) The ‘d’ version
The electronics as well as the termination compartment are placed in a pressure tight housing.

The termination c ompartment is not fitted with any glan d f or the mains supply or the
input/output c ables. The customer is responsib l e for fitting an Ex approved cable gland into
the PG16 thread of the housing. There a re various suppl i ers for such cable glands on the
market. The protection class of the termination compartment is ‘d’.

For both cases the required waiting time between switching off the electronics and opening the
housing has to be con si d ered. The waiting time is mentioned on the data plate of the system
and amounts to 25 minutes for T6 and 10 minutes for T5.
The Ex protection of the system is not valid if the electronics housing is not closed securely.
Make sure after opening the converter housing, to cl ose it fully with the enclosed wrench .

The programming of the converter may also be performed with a closed lid by using the
enclosed magnet. Three magnet sensors are ass embled on the display board, which allow the
user to operate t he converter without touching the display itself.

5

After opening the converter ho using as desc ribed above, on e of the follo wing operations may
be performed by th e l ocal KROHNE service engineer :-

•

Replace supply f use F9

•

Changing electr onics

•

Changing supply voltage setting

• Changing EPROM’s

These operations are to be performed in an identical manner to the standard converter.
(Please refer to the standard operation manual).
Make sure the correct main fuse (right value, cerami c body, 1500A) and t he corresponding fuse
label on the fuse housing is used. Fuses and lab el s may be ordered from KROHNE.

Using wrong fuses violates the Ex approval and may damage the system.
The earthing metal sheet of the electronic must be fastened firmly with the srew onto the
converter housing!

The converter sho ul d be ‘high pot’ te sted accordin g to a specific pr ocedure. Therefor e, it is not
permitted to c hange output mo dules or any other h ardware component s (except the list
mentioned ab ove by the local service engineer) withou t repeating the ‘high pot’ test. Please
contact KROHNE for advice.

1.3 Installation of the MFM 4085 K EEx and MFM 4085 F EEx

In order to get the highest possible acc uracy, the user is advised t o carry out the pipework
installation as described in the standard manual.
Further requirements / differences are listed below :

•

The ideal installation factor of an EEx unit is much higher than of a standard system. The
high insta llation factor do es not mean less accuracy. Due to Zener barriers a nd clamping

E

diodes the E

x system consumes m ore power during running.

The installation factor should have a value as indicated in the following table.

Meter Size Installation factor
10 G
100 G
300 G
800 G
1500 G

3000 G

200
150
400
300
300
400

The correct operation of the Zener barriers inside the converter are only guaranteed with a

ridged and safe connection of the converter housing with potential earth (potential
compensation PA). Please use the outer earthing connector at the square flange of the
converter housing for earthing.

In case the converter housing has a pressure tight termination compartment, make sure the
connected c able glands / adapters have an Ex certification.

6

2. Electrical installation

2.1 Location and conne cting cables

Location

Do not expose the com pact flow meter to d irect sunlight. Install a su nshade if necessary.

Connect i n g cables

To conform to prot ection category requiremen ts , observe the fol lowing recomme ndations:
– Fit blanking plug PG 16 and apply sealant to unused cable entries.
– In case if the terminal area is Eed, please use approved blanking plug.
– Do not kink cables dire ct ly at cable entri es.
– Provide water drip point (U bend in ca ble).
– Do not connect rigid conduit to cable entries.
– If cables are a tigh t fit, enlar ge insid e diame ter of cable gland by removing the appr opriat e

ring(s) from the seal.

2.2 Electrical Connecti on on converter without i ntrinsically safe outputs

Please ensure that the information about power given on the
dataplate cor re sponds to the lo cally available ma i ns voltage.

– Note information given on the instrument dataplate (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"

installation instructions.

– The

PE protective ground conductor must

be connected to the separate U-clamp

terminal in the terminal b ox of t he signal converter.

– Do not cross or loop the cables in the terminal box of the signal convert er. Use se parat e

(PG or NPT) cable glands fo r power and output cab les.

– Ensure that the

screw thread of the round cover

on the term inal box is well gr eased 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 damage.

5 6 4 4.1 4.2 11 12

N L AC
Outputs - + DC
connection PE
see Sect. 2.2

Power and signal connections for MFC 085 K

7

The tables below show the possible 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

No Option 1*

(Current, pulse, alarm and

input )

Option 2*

(2x current, not

galvanically isolated)

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

4.1 Pulse output Current output 2 (+)

4.2 Status output (active) Status output (passive)

•

The inputs/outputs share a comm on signal grou nd wh i ch is galavanical l y i solated from the

ground (PE)
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 interferences. The use
of screened cables and a filt er capacitor next to an y counter is reco m m ended.

It is possible to connect the pulse output without an external voltage supply. However to do this
the function of the status outp ut must be sacrificed. (Fig. b)

If the alarm output i s used to po wer the pulse si gnal the n the follo wing setting s

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)

Vext

(

150 mA)

≤

R

ext

abgeschirmtes KabelPulsausgang

Zähler

Masse

Fig. a Preferred connections to an external counter with seperate power supply
(Example). For correct wiring see tables of input/output connections

8

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

tables of input/ output con nections

Additional input/output options

No. Option 4*

(Current and
RS485)

5 Common

(-)

6 Current

output 1 (+)

4 TX/RX TX/RX Control Input Current

4.1 TX/RX TX/RX Pulse Output A Control Input Current

4.2 +5V +5V Pulse Output B Pulse Output Pulse output Control Input Status output

Option 5*

(Current and
Modbus)

Common
(-)

Current
output 1 (+)

Option 6

(1 Current,
1 Dual phase
pulse output
and input)

Common
(-)

Current
output 1 (+)

Option C

(2 current,
pulse and
input)

Common
(-)

Current
output (+)

output 2 (+)

Option D

(3 current
and

pulse)

Common
(-)

Current
output 1 (+)

Current
output 2 (+)

output 3 ( +)

Option E

(3 current
and

input)

Common
(-)

Current
output 1 (+)

Current
output 2 (+)

Current
output 3 (+)

Option F

(3 current
and

alarm

Common
(-)

Current
output 1 (+)

Current
output 2 (+)

Current
output 3 (+)

(passive)

The pulse output an d status outputs where are passive outputs.
* Refer to separate RS 485 or Modbus manual

2.3 Electrical connection on converter with intrinsically safe outputs

Please ensure that the information about power given on the
data plate corr esponds to the l ocally availabl e m ains voltage.

– Note information given on the instrument data plate (voltage,frequency)!

Electrical connection in con form it y with IEC 364

–

or equivalent standard.

– The PE ground conductor must be connected to the seperate U-clamp terminal in the

terminal box of the signal convert er.

Do not cross or loop the cables

–

in the bac k of t he con ver ter. Pl ea se us e s eper ate c ab le

entries (PG or NPT) for power and signal cables.

9

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 alum inium; typically it mus t be resin-

and acid free.

– Protect the

sealing ring

from damage.

11 12

- + DC
Coding of the
Outputs acc. to following PE
Table:

Term.
No.

I 1

I 1

B

B

Variant G

(1 current,1

puls

intrins.safe)

current output

(+)

current output

(-)

puls output (+) status output.

puls output (-) status output. (-) control input. (-)

Variant H

(1 current, 1

status output.

intrins.safe)

current output

(+)

current output

(-)

(+)

Variant K

(1 current, 1

control inp.

intrins.safe)

current output

(+)

current output

(-)

control input.

(+)

Term.
No.

I 1

I 1

I 2

I 2

Variant L

(2 current,

intrins.safe)

current

output 1

(+)

current

output 1

(-)

current

output 2

(+)

current

output 2

(-)

Term.
No.

I 1

I 1

D

D

Variant M

1current, 1

Bus

intrins.safe)

current output

1

(+)

current output

1

(-)

Bus

Bus

Please note,that the power supply terminals are behind a lid. To connect, shift lid upwards,
connect power and close lid again.

10

2.3.1 Technical information of the Intrinsically safe outputs

Variant G,H K,L

type of protection intrinsically safe EEx ia IIC bzw.EEx ib IIC

to connect with intrinsically safe circuits with following maximum values:

U
I
P

≤30 V Ci=5nF

i

≤ 250 mA Li=0

i

≤ 1,0 W

i

Variante M type of protection intrinsically safe EEx ia IIC bzw.EEx ib IIC

to connect with intrinsically safe fieldbus with following maximum

values (FISCO ): l

Connection

≤

30 V C

U
I
P

i

≤ 250 mA Li= 0

i

≤ 1,0 W

i

= 5 nF

i

2.4 Overview PTB and FM Approvals

System
configuration

PTB

FM Div 1 FM Div. 2

Cenelec

MFM 4085 K 10G - 300 G ✓, Ex 94.C .2054 X ✓ , J.I.1Y6A2.AX ✓, J .I.4Y0A5.AX
800 G, 1500 G ✓, Ex 94.C.2054 X

✓, J.I.5B2A9.AX ✓, J.I.5B3A0.AX

1. Addendum

3000 G+ ✓, Ex 94.C.2054 X

3. Addendum

J.I.3003000 Approved-no

J.I. number

assigned

Fluidheating ✓, E x 94.C.2054 X

in preparation in preparation

2. Addendum

Multi I/O

✓

in preparation in preparation

Converter

Intrinsically safe

output

PROFIBUS PA

✓, E x 94.C.2054 X

4. Addendum

✓

, Ex 94.C.2054 X

in preparation in preparation
in preparation in preparation

4. Addendum

MFM 4085 F 10G+ - 3000 G ✓ , Ex-97.D.2195 D

Ex-97.D.2194

J.I.3003000 Approved-no

J.I. number

assigned

Fluidheating ✓, Ex-97.D.2195 D

in preparation in preparation

Ex-97.D.2194

✓

Multi I/O

in preparation in preparation

Converter

Intrinsically safe

in preparation in preparation in preparation

output

PROFIBUS PA in preparation in preparation in preparation

11

3. Certification

12

4. Data Plates

4.1 Ex PTB

4.2 Ex PTB with Custody Transfer

61

4.3 Ex PTB with in trinsically safe outputs

62

4.4 FM Class 1 Div 1

4.5 FM Class 1 Div 2

63