μ-FLOW L01V12

Ultra Low-Flow Thermal Liquid Mass Flow Controller

  • Fast and accurate measuring signal
  • Insensitive to mounting position
  • Very small internal volume
  • Suitable for liquids with low boiling points
  • Analog, RS232 or fieldbus communication
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Liquid Mass Flow Controllers for low flow rates

Bronkhorst® model L01V12 Liquid Flow Controllers (LFCs) are suited for precise measurement and control of flow ranges between 5…100 mg/h and 0,1...2 g/h at operating pressures up to 100 bar. The LFC consists of a thermal mass flow sensor and a microprocessor based pc-board with signal and fieldbus conversion and a PID controller for mass flow control by means of an integrated control valve.

μ-FLOW series are equipped with a digital pc-board, offering high accuracy, excellent temperature stability and fast response. The main digital pc-board contains all of the general functions needed for measurement and control. In addition to the standard RS232 output the instruments also offer analog I/O. As an option, an on-board interface can be mounted to provide DeviceNet™, PROFIBUS DP, Modbus or FLOW-BUS protocols.

Technical specifications

Measurement / control system
Flow range (intermediate ranges available)min. 5…100 mg/h
max. 0,1…2 g/h
(based on H2O)
Accuracy (incl. linearity) (based on actual calibration)± 2 % FS
Repeatability< 0,2 % FS (typical H2O)
Turndown ratio1:20 (5…100%)
Settling time (in control, typical)2 … 4 sec.
Operating temperature5 … 50 °C
Temperature sensitivity± 0,2% FS/°C
Max. Kv-value2,37x10-3
Max. fluid viscosity0.1 Pa*s
Attitude sensitivitynegligible
Warm-up timeapprox.10 min. for accuracy ± 2% FS
Mechanical parts
Material (wetted parts)stainless steel 316L/320;
other on request
Pressure rating (PN)100 bar abs
Max. ΔP10 bar dif.
Process connections1/16” or 1/8” OD compression type; other on request
(<1 g/h we advise to use 1/16" only)
Purge connection1/16” OD compression type
others on request
Ingress protectionIP40
Electrical properties
Power supply+15 … 24 Vdc +/-10%
Max. power consumption
15 V
24 V
at voltage I/O
285 mA
250 mA
at current I/O
305 mA
270 mA
extra for fieldbus
<75 mA
<50 mA
Analog output0…5(10) Vdc or 0 (4)…20 mA (sourcing output)
Digital communicationstandard: RS232;
options: PROFIBUS DP, DeviceNet™, Modbus RTU, FLOW-BUS
Electrical connection
Analog/RS2329-pin D-connector (male)
PROFIBUS DPbus: 9-pin D-connector (female);
power: 9-pin D-connector (male)
CANopen® / DeviceNet™5-pin M12-connector (male)
FLOW-BUS/Modbus-RTU/ASCIIRJ45 modular jack
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


LIQUI-FLOW - µ-FLOW brochure

General manual digital instruments
Operating instructions digital instruments

Hook-up diagrams
Analog IO - RS232

Dimensional drawing
Dimensional drawing μ-FLOW L01V12

Bronkhorst USA LLC

57 South Commerce Way
Suite 120
USA - Bethlehem, PA 18017 
Tel.  +1-610-866-6750

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