The intrinsically safe pressure transmitter
program is designed for use in hazardous
environments and oers a reliable pressure
measurement, even in harsh applications with
severe medium inuences like cavitation, liquid
hammer or pressure peaks.
The MBS 4201 and MBS 4251 are Ex ia IIC T6...T4
explosion protected according to the ATEX
directive 94/9/EC whereas the MBS 4701 and
MBS 4751 are Ex ia IIC T4 explosion protected.
Both series come with 4 – 20 mA output signal,
absolute or gauge (relative) versions, measuring
ranges from 0 – 1 to 0 – 600 bar, zero point and
span adjustment, plug connection and a wide
range of pressure connections.
Excellent vibration stability, robust construction,
and a high degree of EMC/EMI protection equip
the pressure transmitter to meet the most
stringent industrial requirements.
Featuresy In compliance with ATEX directive 94/9/EC:
- Ex ia IIC T6...T4 (MBS 42xx series)
- Ex ia IIC T4 (MBS 47xx series)
y Applicable in potentially explosive
atmosphere:
Zone 0, Zone 1, Zone 2 (gases and vapour)
y Enslosure and wetted parts of acid-resistant
stainless steel (AISI 316L)
y Pressure ranges in relative (gauge) or absolute
from 0 up to 600 bar
y Output signal: 4 – 20 mA
Approvals
MBS 4201 and MBS 4251:
y Bureau Veritas, BVy Det Norske Veritas, DNV
y Marine approvedy A wide range of pressure connectionsy Temperature compensated and laser calibratedy MBS 4251 and MBS 4751 with integrated pulse
snubber for protection against cavitation and
liquid hammering
y MBS 4701 and MBS 4751 zero and span
adjustment
y Lloyds Register of Shipping, LRy American Bureau of Shipping ABS
Data sheet | Intrinsically safe pressure transmitter, MBS 4201, MBS 4251, MBS 4701 and MBS 4751
Application and media
conditions for MBS 4251 and
MBS 4751
Pulse-snubber
Ordering standard versions
MBS 4701
Plug: Pg 9 (EN 175301-803-A)
Output: 4 – 20 mA
Pressure connection: G ½ A (EN 837)
Application
Cavitation, liquid hammer and pressure peaks may
occur in hydraulic systems with changes in ow
velocity, e.g. fast closing of a valve or pump starts
and stops.
The problem may occur on the inlet and outlet
side, even at rather low operating pressures.
Media condition
Clogging of the nozzle may occour in liquids
containing particles. Mounting the transmitter in
an upright position minimizes the risk of clogging,
because the ow in the nozzle is restricted to the
start-up period when the dead volume behind the
nozzle orice is relatively big (0.3 mm). The media
viscosity has only little eect on the response time.
Even at a viscosities up to 100 cSt, the response time
will not exceed 4 ms.
Data sheet | Intrinsically safe pressure transmitter, MBS 4201, MBS 4251, MBS 4701 and MBS 4751
Technical data
(continued)
Mechanical characteristics
Materials
Net weight (depending on pressure connection)0.2 – 0.3 kg
Wetted partsEN 10088-1; 1.4404 (AISI 316 L)
EnclosureEN 10088-1; 1.4404 (AISI 316 L)
Ordering special versions
Non-standard build-up
combinations may be selected.
However, minimum order
quantities may apply.
Please contact your local Danfoss
oce for further information.
MBS 4201
MBS 4251
MBS 4701
MBS 4751
Measuring rangePressure connection
0 –1.0 bar
0 –1.6 bar
0 –2.5 bar
0 –4.0 bar
0 –6.0 bar
0 –10 bar
0 –16 bar
0 –25 bar
0 –40 bar
0 –60 bar
0 – 100 bar
0 – 160 bar
0 – 250 bar
0 – 400 bar
0 – 600 bar
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 qualied
persons.
Basic safety and health requirements are fullled 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 EN/IEC60079-25 and EN/IEC60079-14.
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 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 earthing of the
transmitter housing is maintained. The transmitter must all ways 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 specied 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 EN/IEC60079-26) 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 specic thread type.