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 ranges between 0,5…50 kg/h and 6…600 kg/h (which corresponds with 6,66…666,6 ln/min up to 80…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 range
(intermediate ranges available)
min. 0,5…50 kg/h
max. 6…600 kg/h
Mass flow accuracy Liquid: ±0,2% of rate;
Gas: ±0,5% of rate
Turndown up to 1:100
Repeatability ±0,1% of rate
Zero Stability (ZS)* < ±0,1 kg/h
Operating temperature standard: 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)
Mounting*** Any position, attitude sensitivity negligible
Leak integrity Outboard < 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 100 bar abs
Process connections (welded) compression type or face seal couplings
Seals metal
Ingress protection (housing) IP65 (weatherproof)
Electrical properties
Power supply +15…24 Vdc +/- 10%
Max. ripple recommended: 50 mV tt
Power consumption Meter: approx. 80 mA at 15 Vdc
Analog output 0...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)
0...5 (10) Vdc, min. load impedance > 424 kΩ;
0 (4)...20 mA (sourcing), max. load impedance ~ 250 Ω
Digital communication standard: RS232;
options: PROFIBUS DP, DeviceNet™, Modbus RTU, FLOW-BUS
Electrical connection
Analog/RS232 8-pin DIN (male);
PROFIBUS DP bus: 5-pin M12 (female);
power: 8-pin DIN (male);
DeviceNet™/FLOW-BUS/Modbus 5-pin M12 (male);
Control valve options
M55+C0I: Gas flow control valve Kv-max= 6,6 x 10-2
M55+C2I: Liquid flow control valve Kv-max= 2,3 x 10-3
M55+C5I: Gas/Liquid flow control valve Kv-max= 6,6 x 10-2
M55+F-004AI: Gas/Liquid flow control Kv-max= 3,0 x 10-1
M55+F-004BI: Gas/Liquid flow control Kv-max= 1,0

* Guaranteed at constant temperature and for unchanging process and environment conditions.
**   Depends on flow rate, heat capacity fluid, T amb., T fluid and cooling capacity.
***  External shocks or vibrations should be avoided.
Technical specifications and dimensions 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



Hook-up diagrams
Analog I-O RS232

Dimensional drawing
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

Bronkhorst High-Tech B.V.

Nijverheidsstraat 1A
NL-7261 AK Ruurlo (NL)
Tel. +31 573 45 88 00
[email protected]

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