mini CORI-FLOW™ MI140

Low Flow Coriolis Mass Flow Meter / Controller

  • World's most compact, rugged (IP66/IP67) design
  • High accuracy, excellent repeatability and fast response
  • Independent of physical properties
  • Mass flow, density, volume flow, temperature and PID controller outputs
  • Very versatile, suitable for dosing, using any control valve or pump
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mini CORI-FLOW™MI140

Low Flow Coriolis Mass Flow Meters / Controllers for Liquid and Gases

mini CORI-FLOW™ Mass Flow Meters and Controllers are precise, versatile and compact instruments, based on the Coriolis measuring principle, featuring fast response and designed to cover the needs of the low flow market. Bronkhorst® model MI140 Mass Flow Meter (MFM) is suited for highly accurate measurement of gas or liquid flow ranges up to 30 kg/h (which corresponds 400 ln/min when used on nitrogen) at operating pressures up to 200 bar. The instruments are equipped with a robust IP66/IP67 weatherproof housing with screw terminal connections.

The instrument contains a microprocessor, featuring alarm and counter functions, and a PID controller for optional mass flow control by means of a separately mounted control valve or pump. With regard to connectivity, the instruments can be equipped with a wide range of fieldbus options, beside their standard analog and RS232 I/O communication.

Technical specifications

Measurement / control system
Flow ratesLiquid: 0…30 kg/h (nominal flow rate: 10 kg/h);
Gas: 0…400 ln/min (N2);
Full Scale (FS) value user-configurable
Mass flow accuracyLiquid: ≤±0,1% Rd (of Reading), at calibration conditions at FS value;
Gas: ≤±0,5% Rd
Volume flow accuracyLiquid: ≤ ±0,2% Rd, at fixed density value;
Gas: ≤ ±0,5% Rd
RepeatabilityLiquid mass flow: ≤ ±0,05% Rd ± ½ZS (Zero Stability);
Gas mass flow: ≤ ±0,25% Rd ± ½ZS;
Density: ≤ ±1 kg/m3 (at calibration conditions at stable flow)
Turndown ratioup to 1:1000 (in digital mode)
Zero stability (ZS)< ± 6 g/h
(Guaranteed at constant temperature and for unchanging process and environment conditions.)
Response time (sensor)200 msec
Fluid temperature max-20 … +70 °C
Ambient temperature max-20 … +70 °C
Mountingany position, attitude sensitivity negligible.
External shocks or vibrations should be avoided.
Temperature sensitivity0,5 g/h/°C
Temperature accuracy± 0,5 °C
Density accuracy< ± 1 kg/m³ (at calibration conditions at stable flow), up to 2500 kg/m3
Max. fluid viscosity5000 cP
Leak integrity, outboardtested < 2 x 10-9 mbar l/s He
Warm-up time> 30 min for optimum accuracy
Mechanical parts
Sensorsingle tube, DN 1.14, Ra ≤0,8 µm
Material (wetted parts)stainless steel 316L / 1.4404
Housingstainless steel 316L / 1.4404;
silicon seal (bottom), NBR seal (cover)
Pressure rating (PN)200 bar abs
Process connectionscompression type or face seal (VCR/VCO) couplings, or Tri-Clamp flanges (welded)
Sealsnone (in fluid path)
Weight6 kg
Ingress protectionIP66/IP67
Electrical properties
Power supply+15…24 Vdc +/- 10%
Max. ripple recommended: 50 mV tt
Max. power consumptionmeter: max. 3 W;
controller: max 7 W
Analog output0…5 (10) Vdc, min. load impedance > 2 kΩ;
0 (4)…20 mA (sourcing),
  regular, max. load impedance < 375 Ω;
  with HART, load impedance 250...600 Ω
Analog setpoint(for MFM + pump or control valve)
0…5 (10) Vdc, min. load impedance > 100 kΩ
0 (4)…20 mA (sourcing), max. load impedance ~ 250 Ω
Digital communicationstandard: RS232;
options: CANopen®, DeviceNet™, EtherCAT®, PROFIBUS DP, PROFINET, Modbus RTU, ASCII or TCP/IP, EtherNet/IP, POWERLINK, FLOW-BUS or HART
Electrical connection
Analog/RS232M20 gland
CANopen® / DeviceNet™M20 gland
FLOW-BUS/Modbus-RTU/ASCIIM20 gland
Modbus TCP / EtherNet/IP / POWERLINKM20 gland
EtherCAT®/ PROFINETM20 gland
Control valve options
External actuator options to be connected to the controller
Ex-proof specifications
Approvals / certificates

Technical specifications subject to change without notice.

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


Datasheet Industrial mini CORI-FLOW Series MI1N0
mini CORI-FLOW overview brochure
CORI-FILL brochure
Industrial mini CORI-FLOW manual
Hook-up diagrams
Analog I/O, RS232 and HART
Ethernet interfaces (EtherCAT, EtherNet/IP, Modbus-TCP, POWERLINK, PROFINET)
Optional Bus and IO Configurations
Dimensional drawings
Dimensional drawing MI1x0
Dimensions Weld Adapters
Solids 3D