MBS 4201 and MBS 4251:
y Bureau Veritas, BV
y Det Norske Veritas, DNV
y Lloyds Register of Shipping, LR
y American Bureau of Shipping ABS
The intrinsically safe pressure transmitter
program is designed for use in hazardous
environments and offers a reliable pressure
measurement, even in harsh applications with
severe medium influences 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.
Features
y 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
y Marine approved
y A wide range of pressure connections
y Temperature compensated and laser calibrated
y 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
Data sheet
Intrinsically safe pressure transmitter
MBS 4201, MBS 4251, MBS 4701 and MBS 4751
IC.PD.P20.VB.02 | 520B8007 | 1© Danfoss | DCS (im) | 2019.01
Approvals
Data sheet | Intrinsically safe pressure transmitter, MBS 4201, MBS 4251, MBS 4701 and MBS 4751
© Danfoss | DCS (im) | 2019.012 | 520B8007 | IC.PD.P20.VB.02
Ordering standard versions
MBS 4701
Plug: Pg 9 (EN 175301-803-A)
Output: 4 – 20 mA
Pressure connection: G ½ A (EN 837)
MBS 4751
with pulse snubber
Application and media
conditions for MBS 4251 and
MBS 4751
Pulse-snubber
Type no.
Measuring range
Pe
1
)
[bar]
Code number
MBS 4751-3211-A1AB08 0 – 160 060G4311
MBS 4751-3411-A1AB08 0 – 250 060G4312
MBS 4751-3611-A1AB08 0 – 400 060G4313
MBS 4751-3811-A1AB08 0 – 600 060G4314
1
) Relative / gauge
Type no.
Measuring range
Pe
1
)
[bar]
Code number
MBS 4701-1011-A1AB08 0 – 1 060G4303
MBS 4701-1211-A1AB08 0 – 1.6 060G4300
MBS 4701-1411-A1AB08 0 – 2.5 060G4304
MBS 4701-1611-A1AB08 0 – 4 060G4305
MBS 4701-1811-A1AB08 0 – 6 060G4306
MBS 4701-2011-A1AB08 0 – 10 060G4307
MBS 4701-2211-A1AB08 0 – 16 060G4301
MBS 4701-2411-A1AB08 0 – 25 060G4308
MBS 4701-2611-A1AB08 0 – 40 060G4309
MBS 4701-2811-A1AB08 0 – 60 060G4302
Application
Cavitation, liquid hammer and pressure peaks may
occur in hydraulic systems with changes in flow
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 flow in the nozzle is restricted to the
start-up period when the dead volume behind the
nozzle orifice is relatively big (0.3 mm). The media
viscosity has only little effect on the response time.
Even at a viscosities up to 100 cSt, the response time
will not exceed 4 ms.