Bronkhorst®
Instruction Manual EL-PRESS™
9.17.101I
9
1.3.2
Forward pressure controller (P-600 series)
A forward or downstream pressure
controller enables controlling the pressure
of a system at the downstream side of the
instrument. The pressure controller is
situated after the control valve. Opening
the valve increases the downstream
pressure (P
2
).
1.3.3
Back pressure controller (P-700 series)
A back or upstream pressure controller is
used to regulate the pressure of a system
at the upstream side of the instrument. The
pressure controller is situated before the
control valve. Opening the valve decreases
the upstream pressure (P
1
).
1.3.4
Process Pressure Controller (P-800 series)
With the EL-PRESS™ Process Pressure Controller, Bronkhorst has developed an integrated forward and back pressure
controller. This special type of instrument can be used, for instance, to maintain a constant pressure in a vessel, as a pilot
device for a secondary pressure regulator, or for controlled pressurization and depressurization of a closed volume or
system.
The Process Pressure Controller
incorporates two control valves, that serve
as an inlet valve and a relief valve
respectively. Opening the inlet valve
increases the pressure in the outgoing
conduit, whilst opening the relief valve
decreases it. The pressure sensor measures
the pressure in the outgoing conduit (P
2
).
Both valves are driven by a controller,
which gets its input from the pressure
sensor.
1.4
Calibration
The EL-PRESS™ is factory calibrated. Periodical inspection, recalibration or verification of the accuracy may be subject to
individual requirements of the end user.
Bronkhorst certifies that the instrument meets the rated accuracy. Calibration has been performed using measurement
standards traceable to the Dutch Metrology Institute (VSL).
1.5
Maintenance
The EL-PRESS™ needs no regular maintenance if operated properly, with clean media, compatible with the wetted materials,
avoiding pressure and thermal shocks and vibrations. Units may be purged with a clean, dry and inert gas.
In case of severe contamination, cleaning the inside of the device may be required.
Inexpertly servicing instruments can lead to serious personal injury and/or damage to the instrument or the system it is
used in. Servicing must therefore be performed by trained and qualified personnel. Contact your Bronkhorst representative
for information about cleaning and calibration. Bronkhorst has a trained staff available.
