> Introduction
Bronkhorst High-Tech B.V., the European market leader in thermal
Mass Flow Meters/Controllers and Electronic Pressure Controllers,
has 25 years experience in designing and manufacturing precise
and reliable measurement and control devices. With a wide range
of instruments, Bronkhorst High-Tech offers innovative solutions
for many different applications in many different markets. The
instruments are made to customers’ specification, in various styles,
suitable for use in laboratory, industrial and hazardous areas, in
such diverse applications as semiconductor and analytical
installations, to name but two.
> EL-PRESS series Pressure Meters and
Controllers
The EL-PRESS series electronic Pressure Meters and Controllers
have a well-proven compact thru-flow design and are available in
pressure ranges from 2…100 mbar up to 8…400 bar, both in
absolute and relative (gauge) pressure. A differential pressure
transducer can also be supplied in the ranges of 2…100 mbar
up to 0,3…15 bar. The pressure controller performs with high
accuracy and repeatability and should be specified for forward
or backward pressure control.
> State of the art digital design
Todays EL-PRESS series are equipped with a diaphragm type
piezoresistive pressure sensor and a digital pc-board as standard
and offer high accuracy, stability and reliability. The basic 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 integrated interface
board provides DeviceNetTM, PROFIBUS-DP®, Modbus-RTU or
FLOW-BUS protocols. The latter is a fieldbus based RS485, specifically
designed by Bronkhorst High-Tech for their mass flow and
pressure metering and control solutions, and with which the company
already has over ten years of experience with digital communication.
> Pressure Controllers for every application
The
control valve can be furnished as integral part of an EL-PRESS
Pressure Controller (EPC), or as a separate component. It is a
proportional, electromagnetic
control valve with extremely fast and
smooth control characteristics. With reference to the specific
field of application there are different series of
control valves.
There is a standard direct acting valve for common applications, a
pilot operated valve for high flow rates, the so-called Vary-P valve
that can cope with up to 400 bar ÄP and a bellows valve for
applications with very low differential pressure.
> EL-PRESS features
u high accuracy and repeatability
u high pressure capability up to 400 bar
u suitable for gases and liquids
u optional metal sealed and down-ported constructions
u standard analog 0…5(10) V / 0(4)…20 mA and digital RS232
communication
u optional fieldbus interface (DeviceNetTM / PROFIBUS-DP® /
Modbus-RTU / FLOW-BUS)
> Fields of application
u Semiconductor processing
u Gas and liquid chromatography
u Vapour pressure control in MOCVD processes
u Protective gas pressure control in extrusion moulding processes
u Autoclave / reactor pressure control
EL-PRESS
Digital Electronic Pressure Meters and Controllers
