Edwards A652-07-903, Инструкция по эксплуатации

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A652–07–880 Issue C
Page 2 © Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trade marks of Edwards Limited.
Introduction
1.2 Description
Refer to Figure 1 . The E-LAB 2 is a complete laboratory pumping system, which has a two-stage, rotary vane vacuum
pump. An oil mist filter (6) is fitted to the outlet of the pump, to prevent the discharge of oil mist. An inlet catchpot
(4) is fitted to the pump inlet to minimise the ingress of condensable vapours into the pump.
The E-LAB 2 has a gas ballast oil return assembly (16) which continuously returns oil trapped in the mist filter to the
pump.
The vacuum pumping mechanism is oil sealed. You can inspect the level and condition of the oil in the oil-box through
the sight-glass (8). Diagrams on the side panels and on the oil change tag (
Figure 2 , item 4) give guidance on when
you should change the oil. Two oil filler-plugs (7) and an oil drain-plug (9) are provided on the oil-box.
The pump mechanism is driven directly by a single-phase electric motor through a flexible motor-coupling. The motor
is totally enclosed and is cooled by the motor cooling-fan which directs air along the motor fins. The pumps are cooled
by an additional fan attached to the motor-coupling.
The motor has an on/off switch (12) and a thermal overload device. When the motor is too hot, the thermal overload
device switches off the pump. The thermal overload device has an automatic reset; when the motor cools down, the
device resets and (unless you have incorporated suitable control equipment which must be manually reset: see
Section 3.10.2 ), the motor will restart.
The E-LAB 2 has a gas ballast oil return assembly, which is supplied configured to automatically deliver high gas
ballast flow rate into the pump; this prevents the condensation of vapours in the pumped gases and allows you to use
the E-LAB 2 to pump high vapour loads. If required, you can reduce the gas ballast flow rate into the pump, or switch
off the gas ballast flow.
When the E-LAB 2 is switched off, an inlet-valve seals the inlet and prevents the suck-back of air and oil into the
vacuum system.
The E-LAB 2 has a retractable lifting handle (15) and is mounted on a base plate on rubber feet (11).