Bronkhorst

LIQUI-FLOW™ L23

Digital Thermal Liquid Mass Flow Meter

  • 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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LIQUI-FLOW™L23

Liquid Mass Flow Meters for low flow rates

Bronkhorst® model L23 Liquid Flow Meters (LFMs) are suited for precise measurement of flow ranges between 2…100 g/h and 20...1000 g/h at operating pressures up to 100 bar. The LFM consists of a thermal mass flow sensor and 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.

LIQUI-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, EtherCAT® or FLOW-BUS protocols.


Technical specifications

Measurement / control system
Flow range (intermediate ranges available)min. 2…100 g/h max. 20...1000 g/h
Accuracy (incl. linearity) (based on actual calibration)± 1 % FS
Repeatability< 0,2 % FS (typical H2O)
Turndown ratio1:50 (2...100%)
Operating temperature5 50 °C
Temperature sensitivity± 0,1% FS/°C
Attitude sensitivitynegligible
Warm-up time30 min. for optimum accuracy; 2 min for accuracy ± 2% FS
Mechanical parts
Material (wetted parts)stainless steel 316L/320; others on request
Pressure rating (PN)100 bar abs
Process connectionscompression type or face seal couplings
SealsKalrez®-6375; others on request
Ingress protectionIP40
Electrical properties
Power supply+15 24 Vdc +/-10%
PROFIBUS DPadd 53 mA (15 V supply) or 30 mA (24 V supply)
CANopen® / DeviceNet™add 48 mA (24 V supply)
Analog output0...5 (10) Vdc or 0 (4)...20 mA (sourcing output)
Digital communicationstandard: RS232; options: PROFIBUS DP, DeviceNet™, EtherCAT®, 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)
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

Downloads

Brochures
LIQUI-FLOW series L10-L20 brochure

Manuals
General manual digital instruments
Operating instructions digital instruments

Hook-up diagrams
Analog IO - RS232
DeviceNet
EtherCAT
FLOW-BUS
Modbus
PROFIBUS DP

Dimensional drawing
Dimensional drawing LIQUI-FLOW L23


Bronkhorst USA inc.

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

     
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