EX-FLOW Ex-Proof (ATEX Zone-1 Certified) Mass Flow Meters / Controllers for gases0 pages

EX-FLOW
Ex-Proof (ATEX II 2 G) Mass Flow Meters and Controllers for Gases

> 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 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 environment, hazardous
areas, semiconductor or analytical installations.

> E X-FLOW series for hazardous areas

The Mass Flow Meters of the EX-FLOW series are of rugged
design for gas flow applications in hazardous environments.
The intrinsically safe measuring head is tested according to ATEX
95 Directive 94/9/EC and approved under EC-Type Examination
Number: KEMA 01ATEX1172, protection II 2 G Ex ib IIC T4 Gb.
This stands for:
II 2 Gt
Ex ib IIC T4t
ibt
IICt
T4t
Gbt

=
=
=
=

ATEX group and category
CENELEC marking
intrinsically safe Zone 1
h
ighest gas group with a minimum ignition energy
of 20 μJ, with gases such as acetylene or hydrogen
= max. surface temperature of 135°C
= IEC equipment protection level

valve for common applications, a pilot operated valve for high flow
rates and the so-called Vary-P valve with a pressure rating of 400 or
700 bar, that can cope with up to 400 bar ΔP. These valves will be
equipped with explosion proof certified coils. There are two options:
Coil XB:t protection II 1 G Ex ia IIC T6
t
protection II 1 D Ex ta IIIC T80°C
Coil XC:t protection II 2 G Ex eb IIC T4
t
protection II 2 D Ex tb IIIC T130°C
The electrical connection of flow meter and control valve to the
safe E-7000 readout system (located in the safe zone) is achieved
via separate cables. The readout system contains a controller
function pc-board to complete the control loop.

> General EX-FLOW features

The housing of the electronics compartment is rated to IP65.
Mass Flow Meters can be supplied in ranges starting from
0,16…8 mln/min up to 11000 m3n/h air-equivalent, with pressure
rating between vacuum and 700 bar. In combination with control
valves, either integrated or separate, Mass Flow Controllers can be
offered up to 10…500 m3n/h air-equivalent.

utATEX approval Cat.2, Zone 1
utweatherproof IP65 housing
utflow ranges from 0,16…8 mln/min up to 220…11000 m3n/h
utoptional: low-ΔP versions up to 4…200 ln/min
utpressure ratings up to 700 bar

> ass Flow Controllers for every application
M

utProcess gas measurement or control in (petro-) chemical industries
utFuel cell technology
utGas distribution systems
utHydrogenation processes
utGas consumption measurement for internal accounting
utHeating or biogas production

The control valve can be furnished as an integral part of an
EX-FLOW MFC, or as a separate component. It is a proportional,
electromagnetic control valve with 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

> Fields of application