© Danfoss | DCS (im) | 2017.07
4 | 520B7682 | IC.PI.P20.C7.02
Safety instructions
All national safety regulations must be complied with in connection with installation, start-up and operation of Danfoss pressure
transmitters type MBS 4201, MBS 4251, MBS 4701 and MBS 4751. Furthermore, the requirements of the Declaration of Conformity and
national regulations for installation in explosion areas apply. Disregarding such regulations involves a risk of serious personal injury or
extensive material damage.
Work in connection with the pressure transmitters mentioned must be performed only by suitably qualified persons.
Basic safety and health requirements are fulfilled through compliance with:
EN60079-0: 2012, IEC60079-0: 6th edition, EN60079-11: 2012, IEC60079-11: 6th edition, EN60079-26: 2007, IEC60079-26: 2nd edition.
Special Ex protection instructions:
In the event of damage to enclosure or diaphragm, the pressure transmitter must be replaced.
The end user must ensure the installation is made in accordance to IEC/EN60079-25 and IEC/EN60079-14.
WARNING
–Potential Electrostatic Charging Hazard. The transmitter must only be installed in surroundings with low wind speed, and
where rubbing on the plug is unlikely. Cleaning with a damp cloth is recommended. To avoid build -up of electrostatic discharge it
must be ensured the pressure connection of the pressure transmitter is having a reliable connection to earth with an impedance no
exceeding 1 Gohm.
The MBS transmitters do not provide isolation meeting the dielectric strength requirements of IEC/EN60079-11.
MBS transmitters contain 10 nF capacitance from any input terminal to earth.
Special conditions for safe use in accordance to the ATEX/IECEx certificate:
For installations in which both the Ci and Li of the connected apparatus exceeds 1% of Co and Lo parameters (excluding the cable),
then 50% of Co and Lo parameters are applicable and shall not be exceeded.
Special precautions are necessary to reduce the risk due to electro-static discharge. The transmitter must only be installed in sur-
roundings with low wind speed, and where rubbing the plug is unlikely. Cleaning with a damp cloth is recommended.
The installation shall ensure that the resistance to earth of metallic parts of the equipment enclosure is less than 1 GOhm.
The equipment does not provide 500 V isolation to earth as required by IEC/EN60079-11: clause 6.3.12.
Installations of the pressure connection across boundary walls requiring Category 1G equipment and a less hazardous area must
be gas tight as required by IEC/EN60079-26. Gaskets and seals used at the pressure connection must be suitable for use with the
process medium.
Special instruction when adjusting MBS 47xx series:
If possible only adjust the MBS in non-hazardous area or take precaution to avoid electrostatic discharge and ensure the earthen of
the transmitter housing is maintained. The transmitter must always be supplied from an intrinsic safety barrier.
Demands on the medium:
Parts in contact with the medium are made of stainless steel, EN 1088-1 1.4404 (AISI 316L). The user is responsible for a careful analysis
of all process parameters when materials have to be specified and for ensuring the process medium is neutral to stainless steel as
some media can be corrosive. The end user must ensure that the process connection is gas tight (as required by IEC/EN60079-26)
which may require the use of a suitable gasket/seal in combination with the process connection to obtain a gas-tight connection.
Gaskets and seals used at the pressure connection, including those supplied with the transmitters, must be determined as being
suitable for use with the process medium and process pressure/temperature before use and alternative gasket material chosen if
necessary. The end user must ensure the transmitter pressure connection is tightened with the correct torque as required for the
specific thread type.
In case of problems please contact:
Danfoss A/S
DK-6430 Nordborg
Denmark
You find the EC-Type Examination Certificate at:
www.ia.danfoss.com/ATEXcertificate
DIN 43650, Pg 9
DIN 72585-A1-3.2-Sn
Materials of electrical connections
Glass filled polyamid, PA 6.6
Glass filled polyester, PBT
PVC cable or ETFE
Protection
IP65
IP67 / IP69K
IP67
Safety Instructions
