Text version of the page

Series L01 Digital Mass Flow Meters / Controllers for Liquids

General catalog - 15524 µ-FLOW

> Introduction

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. A wealth of experience has been gathered over the past 25 years, which has resulted in three product series that cover Full Scale flow ranges from 30 mg/h up to 20 kg/h.

> From MICRO- to NANO-flow ranges

Bronkhorst High-Tech works in very close contact with its customers to ensure constant improvement and innovation to its’ product range. Today’s market for liquid flow meters tends to develop into the very small flow ranges – even into nano-flow ranges. With the new generation of thermal liquid mass flow meters / controllers of the µ-FLOW Series, Bronkhorst High-Tech offers the solution for this complicated task. The result of the new development is a small, compact instrument with ranges from 25…500 nanolitres per minute (1,5…30 mg/h) up to 0,1…2 g/h. In addition, the new instrument offers a digital pc-board with optional on-board interface to Profibus

> General features µ-FLOW series L01

U

fast and accurate measuring signal

U

insensitive to mounting position
® , DeviceNet
TM , Modbus-RTU or FLOW-BUS.

U

very small internal volume (using SS316 1,5…20 µl) $ T is sensed by the upstream and downstream temperature sensors and this

U

stainless steel sensor; other materials, e.g. PEEK
TM or Fused Silica are available on request $ T is a function of both the flow-rate and heat capacity of the liquid to be measured.

> µ-FLOW series L01

U

suitable for liquids with low boiling points The µ-FLOW L01 mass flow meter is basically a straight sensor tube without any moving parts or built-in obstructions. The heater/ sensor assembly utilises the heat transfer principle and is arranged around the tube. Upon flow, the

U

for laboratory and OEM applications

> Digital features

U

DeviceNet
TM , Profibus-DP
® , Modbus-RTU or FLOW-BUS slave

U

RS232 interface

U

other fieldbus options on request

U

alarm and counter functions

> Liquid flow control

Flow control is achieved by integrating a control valve onto the body of the liquid flow meter. This control valve has a purge con- nection 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.

> Fields of application

U

Semiconductor industry

U

HPLC applications

U

Chemical industry

U

Food & Pharmaceutical industry

U

Analytical laboratories