Data sheet
Pressure transmitters for CO2 food retail applications
MBS 8250
MBS 8250 is a series of compact pressure transmitters developed and thoroughly tested to ensure excellent operation in CO2 applications. It monitors the suction and discharge pressure in a CO2 suband transcritical cycle and offers a reliable pressure measurement.
The technology combining piezo resistive sensor element and programmable gain amplifiers makes the MBS 8250 the obvious choice for applications demanding highest accuracy and insensitiveness like controlling the pressures
in CO2 applications. Further this technology enhances the functional safety by limiting the output signal at excess pressure conditions, it allows excellent sink/source capabilities and it leave the pressure transmitters unaffected by electromagnetic fields up to 100 V/m.
MBS 8250 with integrated pulse-snubber is designed for protection against cavitation,liquid hammering and pressure peaks.
Features |
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Designed for use in CO2 plants and demanding |
• Version with integrated pulse-snubber. |
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industrial environments |
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Protected against cavitation, liquid hammering |
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• EMC protection 100 V/m up to 2 GHz; |
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and pressure peaks |
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20 V/m up to 4 GHz |
• Enclosure and wetted parts of AISI 316L |
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• For media and ambient temperatures up to |
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Digitally temperature calibrated |
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125 °C |
• Self-diagnostic features on demand |
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• 3.3 mA sink / source |
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(with output clipping) |
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Reverse polarity protected |
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RoHS conformity |
Approvals |
UL 508: Industrial control equipment, |
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file no. E311982 |
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UL 873: Temperature indicating equipment, |
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file no. E31024 |
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UL 1604 Hazloc: Class I, Div. 2, Group A, B, C and D, |
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file no. E227388 |
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CRN 0F18477.5CL |
© Danfoss | DCS (im) | 2017.03 |
IC.PD.P21.I4.02 | 520B7845 | 1 |
Data sheet | Pressure transmitters for CO2 food retail applications, MBS 8250
MBS 8250 Application
Cavitation, liquid hammer and pressure peaks may occur in CO2 systems with changes in the flow
velocity of the gas e.g. fast closing of a valve or
compressor starts and stops.
The problem may occur on the inlet and outlet side, even at rather low operating pressures.
Pulse-snubber
The media viscosity has only little effect on the response time. Even with CO2 in gas form, the response time will not exceed 35 ms
(liquid state < 4ms).
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Technical data |
Performance (EN 60770) |
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Accuracy @ 25 °C (incl. non-linearity, hysteresis and repeatability) |
± 0.5% FS (max.) |
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Non-linearity BFSL (conformity) |
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≤ ± 0.2% FS |
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Hysteresis and repeatability |
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≤ ± 0.1% FS |
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Total error band inside the compensated temperature range |
≤ ± 1% FS |
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Response time MBS 8250 |
Liquids with viscosity < 100 cSt |
< 4 ms |
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(10 – 90%) |
Air and gases |
< 35 ms |
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Overload pressure (static) |
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6 × FS |
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Burst pressure |
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> 6 × FS |
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Durability, P: 10 – 90% FS |
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> 10 × 106 cycles |
Electrical specifications
Nom. output signal |
4 – 20 mA (2-wire) |
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Ratiometric 10 – 90% of supply |
(short-circuit protected) |
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Supply voltage [UB], polarity protected |
9 – 32 V DC |
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5 V DC ± 0.5 V |
> 32 V: Contact Danfoss |
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Supply – current consumption |
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≤ 6 mA |
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Supply voltage dependency |
≤ ± 0.05% FS / 10 V |
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Current limitation |
22 mA ± 0.5 mA |
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Sink / source |
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3.3 mA |
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Output impedance |
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≤ 25 Ω |
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Max load [RL] (load connected to 0 V) |
RL ≤ (UB - 9 V) / 0.02 A |
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RL ≥ 1.5 kΩ |
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2 | 520B7845 | IC.PD.P21.I4.02 |
© Danfoss | DCS (im) | 2017.03 |
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