© Edwards Limited 2014. All rights reserved. Page 1
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Introduction
A301-05-880 Issue A
1Introduction
1.1 Scope and definitions
This manual provides installation, operation and maintenance instructions for Edwards EH mechanical booster pumps
listed below. The pumps must be used as specified in this manual. Read this manual before installing and operating
the pumps.
PFPE pumps:
EH250FX, EH500FX, EH1200FX, EH2600FX and EH4200FX
Hydrocarbon pumps:
EH250, EH500, EH1200, EH2600 and EH4200
Important safety information is highlighted as WARNING and CAUTION instructions; these instructions must be
obeyed. The use of WARNINGS and CAUTIONS is defined below.
Cautions are given where failure to observe the instruction could result in damage to the equipment, associated
equipment and process.
The units used throughout this manual conform to the SI international system of units of measurement.
1.2 Description
1.2.1 Overview
The EH pumps are compact and have high pumping speeds. The EH pumps must be used with a suitable backing pump
delivering at least 1/10th of volumetric capacity of the booster pump. The EH pumps can operate with a maximum
continuous inlet pressure of 1000 mbar. Lower system pressures can be achieved by the use of two or more EH pumps
in series.
On all EH pumps, the hydrokinetic drive/gearbox is connected to the pump outlet by a pressure equalisation
passageway and forms an integral part of the vacuum system. The connecting passageway has a filter which removes
debris and so prevents contamination of the lubricating oil and bearings. For an even cleaner system, evacuate the
end cover/gear cover by connecting the evacuation port (Figure 1, item 5 or Figure 2, item 6) to the pump inlet or
to an external vacuum pump.
The hydrocarbon EH pumps use hydrocarbon oils, such as Edwards Ultragrade 20. Versions of the EH pumps for use
with PFPE (perfluoropolyether) oils are also available for vacuum systems in which enriched oxygen or other reactive
or corrosive gases are pumped. The EH pumps must not be used to pump peroxides.
All of the EH2600 and EH4200 model pumps have an after-cooler in the pump outlet, to reduce the exhaust gas and
rotor temperature.
The EH pumps are safe to handle non-flammable gases and vapours within the normal operating parameters of the
pumps, as defined in this manual.
All EH pumps have ISO inlet flange and outlet flange connections.
Warnings are given where failure to observe the instruction could result in injury or death to
people.
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