Edwards E1M40, Инструкция по эксплуатации

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A344-02-880 Issue J
Page 4 © Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Introduction
For manual control, use the gas-ballast control ( Figure 9 , item 4). The pumps are supplied with an open gas-ballast
inlet ( Figure 9 , item 3). If you leave this inlet open to the atmosphere, then:
z
With the gas-ballast control ( Figure 9 , item 4) open, when you switch the pump off, the pressure inside the
pump will rise to atmospheric pressure
z
With the gas-ballast control closed, when you switch the pump off:
z
E1M40 and E1M80: the pressure inside the pump will slowly rise to atmospheric pressure. (To maintain the
vacuum inside the pump, fit a solenoid operated gas-ballast control valve.)
z
E2M40 and E2M80: the vacuum will be maintained inside the pump.
For remote control, fit a solenoid-operated gas-ballast control valve (available as an accessory from Edwards, refer
to
Section 7 ) to the gas-ballast inlet and open the gas-ballast control. Connect the gas-ballast valve to your control
system so that the valve is closed when the pump is switched off and if the electrical supply to the pump is
interrupted. Under these circumstances, when the pump is switched off, the vacuum will be maintained inside the
pump.
For more information about the use of gas-ballast, refer to Sections 3.10 and 4.1 .