KROHNE CORIMASSE User Manual

Variable area flowmeters

Vortex flowmeters

Flow controllers

Electromagnetic flowmeters

Ultrasonic flowmeters

Mass flowmeters

Level measuring instruments

Communications engineering

Engineering systems & solutions

GR

©

KROHNE 07/2000 D 31 IF10 02 D

Addition to the installation and
operating instructions

CORIMASS E + P Class

MFM 3081 K/F
MFM 2081 K/F

Ex-Version

These instructions should be used in conjunction with the Standard Installation and
Operating Instructions for the MFM 2081/3081 K/F. If you require a copy, please contact
your nearest KROHNE Office or representative.

Product liability and warranty

The CORIMASS mass flowmeter MFM 2081/3081 K/F 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 the Installation and Operating 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.

Content

1 Description....................................................................................................3

1.1 Description of the Transducer............................................................................4

1.2 Description of the Converter..............................................................................4

1.3 Installation of MFM 2081 / MFM 3081 EEx........................................................5

2 Electrical installation...................................................................................6

2.1 Location and connecting cables ........................................................................6

2.2 Electrical Connection on converter without intrinsically safe outputs.....................6

2.3 Electrical connection on converter with intrinsically safe outputs..........................9

2 Additional Instruction for Ex version MFM 2081 / 3081

1 Description

The mass flowmeter MFM 2081/3081 K EEx and MFM 2081/3081 F EEx consists of two
main components:

The Signal Converter, which calculates and displays the measured values and the
transducer which supplies the converter with the analog signals.

A Cable Seal, which is screwed into the converter housing, leads the electric signals from
the transducer to the converter. The signal cable between the transducer and converter is
intrinsically safe.

In the separate version MFM 20381/3081 F EEx the transducer MFS 2000/3000 EEx and
the converter MFC 081 F EEx are connected to each other via a shielded multi-conductor
cable. The maximum cable length is 50 m.

The converter housing of the compact version MFM 2081/3081 K EEx is permanently
screwed onto the transducer and must not be removed at any time.

Cenelec Approvals

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

EN50018 "d" - Pressure tight housing

for the electronics housing and the terminal compartment

EN50019
EN50020

"e" - Increased safety
for the standard termination compartment

"i" - Intrinsically Safe
"b" for the Zener barriers and all electrical circuits inside the transducer

"a" for the converter outputs

The following approvals are valid:
Compact P and E meters, including intrinsically safe

EEx de [ib] IIC T6...T3
EEx d [ib] IIC T6-T3
EEx de [ia/ib] IIC T6-T3
EEx d [ia/ib] IIC T6-T3

Converter, remote mounted version, including intrinsically safe

EEx de [ib] IIC T6-T3
EEx d [ib] IIC T6-T3
EEx de [ia/ib] IIC T6-T3
EEx d [ia/ib] IIC T6-T3

P meter, remote mounted version

EEx ib IIC T6-T3 MFS 2000 F PTB Ex 98.D.2038 X

E meter, remote mounted version

EEx ib IIC T6-T3 MFS 3000 F PTB Ex 98.D.2039 X

Additional Instruction for Ex version MFM 2081 / 3081 3

MFM 2081 K
MFM 3081 K
MFM 2081 Ki
MFM 3081 Ki

MFC 081 F
MFC 081 Fi

PTB Ex 96.D.2037 X

PTB Ex 98.D.2037 X