LIQUI-FLOW series L10/L200 pages

LIQUI-FLOW

TM

Series L10 / L20 Digital Mass Flow Meters / Controllers for Liquids

> Introduction
Bronkhorst High-Tech B.V., the European market leader in thermal
Mass Flow Meters/Controllers and Electronic Pressure Controllers,
has many years experience in designing and ­ anufac­uring precise
m
t
and reliable measurement and control devices. With a wide range
of instruments, Bronkhorst High-Tech offers innovative ­ olutions for
­
s
many different applications in many different ­ arkets. The instrum
ments are made to customers’ specification, in various styles, sui­
table for use in laboratory, industrial environment, hazardous areas,
­
semiconductor processing or analytical equipment.

> LIQUI-FLOWTM series L10 / L20
Bronkhorst High-Tech B.V. has been the pioneer in the field of
micro to low flow liquid metering instruments based on a thermal
measuring principle. The digital LIQUI-FLOWTM Mass Flow Meter
was designed to cover the range between 5 and 1000 g/h t
(Full Scale) in a compact instrument with a fast response. t
The Flow Meter is basically a stainless steel tube without any
moving parts or built-in obstructions. The heater/sensor assembly
is arranged around the tube and, by following the anemometric
p
­ rinciple: a constant difference in temperature (ΔT) is created and
the energy required to maintain the ΔT is dependent of the mass
flow rate. Due to the benefits of the unique patented sensor, the
fluid will be warmed to a maximum of 5°C, thereby making the
L10/L20 series suitable for fluids with low boiling points.

> Liquid flow control
Flow control is achieved by integrating a control valve onto the
body of the Liquid Flow Meter, or by mounting it as a separate
component (in IP65 configuration). This control valve has a purge
connection on top of the sleeve that enables easy elimination of air
or gas when starting up the system. The electronic control function
forms part of the normal circuitry in the liquid flow meter, so the
need for an external controller is eliminated.

> Multi-Bus technology
Bronkhorst High-Tech developed their latest digital instruments
according to the “multi-bus” principle. The basic pc-board on the
instrument contains all of the general functions needed for

m
­ easurement and control. It has analog I/O-signals and also an
RS232 connection as a standard feature. In addition there is the
possibility of integrating an interface board with DeviceNet™,
PROFIBUS DP, Modbus, EtherCAT® or FLOW-BUS protocol.

> General LIQUI-FLOWTM features
u fast and accurate measuring signal
u insensitive to mounting position
u very small internal volume
u suitable for liquids with low boiling points
u for laboratory and OEM applications
u lso available for industrial applications, with IP65 housing,
a
ATEX Cat. 3, Zone 2

> Digital features
u DeviceNetTM, PROFIBUS DP, Modbus-RTU/ASCII, EtherCAT®
t

or FLOW-BUS slave

u RS232 interface
u alarm and counter functions

> Fields of application
u Semiconductor industry
u HPLC applications
u Chemical industry
u Food & Pharmaceutical industry
u Analytical laboratories