Introduction; Figure 1 Vacuum And Flow Rate - Edwards EOSi Series Instruction Manual

Figure 1 Vacuum and flow rate

1. Pressure 1. Pressure
3. Typical pump range (400 mbar(a) to 3. Typical pump range (400 mbar(a) to
10 mbar(a)) 10 mbar(a))
Atmospheric pressure at sea level is approximately 1 bar(a) or 1000 mbar(a). The typical
working range for the pumps is 400 mbar(a) to 10 mbar(a) (-600 mbar(e)
to -990 mbar(e)).
It is important to understand the type of reference to select a correct pressure gauge to
measure the vacuum. Note that the distinction does not matter for a pressure difference
(delta P, example, pressure loss), since it is always the result of subtracting two pressures
(as absolute or effective pressures).
Our pump uses volumetric flow rate to denote the performance.

2.2 Introduction

The pumps are single‑stage, oil‑sealed screw pumps driven by an electric motor. The
pumps are controlled by our controller.
The controller is attached to the front door. An electric cabinet is installed behind the
front door. The electric cabinet contains fuses, transformers, relays, etc.
The pumps use Variable Speed Drive (VSD) technology. The VSD technology helps to
automatically adjust the motor speed as necessary.
The pumps are available as air‑cooled version. The pumps have a sound‑insulated
canopy.
6996022910_B
6996022910_B - General description
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2. Absolute vacuum 2. Absolute vacuum
4. Atmospheric pressure 4. Atmospheric pressure
09/2021 - ©Edwards Limited