Low Flow Coriolis Mass Flow Meter / Controller

  • High accuracy, excellent repeatability
  • Fast response
  • Independent of fluid properties
  • Compact, rugged (IP65) design
  • Optional ATEX approval Cat.3, Zone 2
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Low Flow Coriolis Mass Flow Meters / Controllers for Liquid and Gases

CORI-FLOW™ Mass Flow Meters and Controllers are precise and compact instruments, based on the Coriolis measuring principle, designed to cover the needs of the low flow market. Bronkhorst® model M55 Mass Flow Meter (MFM) is suited for highly accurate measurement of gas or liquid flow in the range of 0…600 kg/h (which corresponds with 0…8000 ln/min when used on nitrogen) at operating pressures up to 100 bar. The instruments are equipped with a robust IP65 weatherproof housing and are optionally available with ATEX approval for use in Zone 2 hazardous areas.

The instrument contains a microprocessor based pc-board with signal and fieldbus conversion and a PID controller for optional mass flow control by means of a separately mounted control valve or pump.

Technical specifications

Measurement / control system
Flow ratesLiquid: 0…600 kg/h (nominal flow rate: 500 kg/h);
Gas: 0…8000 ln/min (N2);
Full Scale (FS) value is user-configurable
Mass flow accuracyLiquid: ±0,2% Rd;
Gas: ±0,5% Rd
Repeatability± 0,1 % RD
Turndown ratioup to 1:100
Zero stability (ZS)< ± 0,1 kg/h
(Guaranteed at constant temperature and for unchanging process and environmental conditions.)
Operating temperaturestandard: 0…70°C;
max. 50°C for ATEX Cat.3, Zone 2;
max. 120°C for special version with remote electronics (130°C ≤ 1 hour allowed for CIP)
MountingAny position, attitude sensitivity negligible;
External shocks or vibrations should be avoided.
Leak integrity, outboardtested < 2 x 10-9 mbar l/s He
Warm-up time> 30 min for optimum accuracy
Mechanical parts
Material (wetted parts)stainless steel 316L or comparable
Pressure rating (PN)100 bar abs
Process connectionscompression type or face seal (VCR/VCO) couplings, or Tri-Clamp flanges (welded)
Ingress protectionIP65 (weatherproof)
Electrical properties
Power supply+15…24 Vdc +/- 10%
Max. ripple recommended: 50 mV tt
Max. power consumptionMeter: approx. 80 mA at 15 Vdc
Analog output0…5 (10) Vdc, min. load impedance > 2 kΩ;
0 (4)…20 mA (sourcing), max. load impedance < 375 Ω
Analog setpoint(for MFM + pump or control valve)
Digital communicationstandard: RS232;
options: options: PROFIBUS DP, DeviceNet™, Modbus RTU or FLOW-BUS
Electrical connection
Analog/RS2328-pin DIN (male);
PROFIBUS DPbus: 5-pin M12 (female);
power: 8-pin DIN (male);
CANopen® / DeviceNet™5-pin M12 (male);
FLOW-BUS/Modbus-RTU/ASCII5-pin M12 (male);
Control valve options
M55+C0I: Gas flow control valveKv-max= 6,6 x 10-2
M55+C2I: Liquid flow control valveKv-max= 2,3 x 10-3
M55+C5I: Gas/Liquid flow control valveKv-max= 6,6 x 10-2
M55+F-004AI: Gas/Liquid flow controlKv-max= 3,0 x 10-1
M55+F-004BI: Gas/Liquid flow controlKv-max= 1,0
External actuator options to be connected to the controller
Certification for hazardous areas
Approvals / certificates

Technical specifications subject to change without notice.

For dimensional drawings and hook-up diagrams please visit the product page on our website


CORI-FLOW M54-M55 brochure
CORI-FILL brochure
KCs certificate
Hook-up diagrams
Analog I-O RS232
Dimensional drawings
M52 - M53 - M54 - M55 Mass Flow Meters
M5x MFM with C0I - C2I control valve
M5x MFM with C5I control valve
M5x MFM with F-004AI control valve
Dimensions Weld Adapters