LIQUI-FLOW Thermal LIQUID Flow Meter & Controller

Liquid Mass Flow Meters for low flow rates, industrial style

Bronkhorst^® model L13I Liquid Flow Meters (LFMs) are suited for precise measurement of flow ranges between 0,25…5 g/h and 5...100 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. The "Industrial Style" LIQUI-FLOW™ model is of rugged design (IP65) for use in industrial environments.

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 CANopen®, DeviceNet™, EtherCAT®, PROFIBUS DP, PROFINET, Modbus RTU, ASCII or TCP/IP, EtherNet/IP, POWERLINK or FLOW-BUS protocols.

Technical specifications

Measurement / control system
Flow range (intermediate ranges available)	min. 0,25…5 g/h max. 5…100 g/h (based on H₂O)









Accuracy (incl. linearity) (based on actual calibration)	± 1 % FS




Repeatability	< 0,2 % FS (typical H₂O)
Turndown ratio	FS <50 g/h : 1:20 (5…100%); FS >50 g/h : 1:50 (2…100%)

























Operating temperature	5 … 50 °C



Temperature sensitivity	± 0,1% FS/°C
















Attitude sensitivity	negligible
Warm-up time	30 min. for optimum accuracy; 2 min for accuracy ± 2% FS

Mechanical parts







Material (wetted parts)	stainless steel 316L/320


Pressure rating (PN)	100 bar abs





Process connections	compression type or face seal (VCR/VCO) couplings

Seals	FFKM/Kalrez®; other on request

Ingress protection	IP65

Electrical properties

Power supply

+15 … 24 Vdc +/-10%

Max. power consumption meter

Supply
15 V
24 V

at voltage I/O
100 mA
65 mA

at current I/O
120 mA
85 mA

extra for fieldbus
<75 mA
<50 mA

Analog output

0…5 (10) Vdc or 0 (4)…20 mA (sourcing output)

Digital communication

standard: RS232;
options: CANopen®, DeviceNet™, EtherCAT®, PROFIBUS DP, PROFINET, Modbus RTU, ASCII or TCP/IP, EtherNet/IP, POWERLINK or FLOW-BUS

Electrical connection
Analog/RS232	8 DIN (male)



PROFIBUS DP	bus: 5-pin M12 (female); power: 8 DIN (male)
CANopen® / DeviceNet™	5-pin M12 (male)

FLOW-BUS/Modbus-RTU/ASCII	5-pin M12 (male)

Modbus TCP / EtherNet/IP / POWERLINK	bus: 2 x 5-pin M12 (female) (in/out); power: 8 DIN (male);

Control valve options

External actuator options to be connected to the controller

Certification for hazardous areas

Approvals / certificates

Downloads

Brochures
LIQUI-FLOW brochure

Manuals
Manual LIQUI-FLOW incl u-FLOW

Hook-up diagrams
Analog IO - RS232
DeviceNet
FLOW-BUS
Modbus RTU/ASCII
PROFIBUS DP
Industrial Ethernet (EtherCAT, EtherNet/IP, Modbus-TCP, POWERLINK, PROFINET)
CANopen
Optional Bus and IO Configurations