Edwards A373-30-940, Инструкция по эксплуатации

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A373-10-880 Issue R
Page 18 © Edwards Limited 2012. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation

Use a suitable inlet catchpot if you pump condensable vapours or if you use the pump for very dusty
applications.

Ensure that sealing surfaces are clean and scratch-free.
Connect your vacuum system to the inlet-port ( Figure 1 , item 6). To make this connection, you can:

Connect to the NW25 flange supplied: use the NW25 centring-ring and O-ring supplied.

Remove the NW25 flange and connect to the 1 inch BSP threaded hole.

Use an NW25 to 28 mm bore tube adaptor available as an optional accessory, refer to Section 7.5.11 .
3.9 Connect the pump outlet
The exhaust system must be configured so that the maximum pressure at the pump outlet does not exceed 0.5 bar
gauge (1.5 bar absolute, 1.5 x 10
5
Pa) at full pump throughput.
We recommend that you fit an oil mist filter to the pump outlet in the following circumstances:

If you use the pump with the gas-ballast control open.

If you operate the pump with an inlet pressure greater than 10 mbar for extended periods.

If you frequently pump down from atmospheric pressure.
The mist filter will trap the oil exhausted from the pump: you can reuse the oil if it is not contaminated.
To connect the pump to your outlet accessories or to your exhaust treatment plant, you can:

Connect 15 mm internal diameter vacuum or plastic hose to the outlet nozzle ( Figure 1 , item 2).

Remove the outlet nozzle and connect to the 3/4 inch BSP threaded hole.

Remove the outlet nozzle and replace it with an NW25 flange adaptor (available as an optional accessory,
refer to
Section 7.5.13 ) and then connect to the NW25 flange.
3.10 Gas-ballast inlet connection
The position of the gas-ballast inlet is shown in Figure 1 (item 4). The gas-ballast inlet has several filters (shown in
Figure 9 ) to trap any dust and debris if you use air as the gas-ballast supply.
If you want to use a different gas for the gas-ballast supply, or if you want to connect a valve to the gas-ballast inlet:
1. Remove the filters (as described in Section 5.6 ).
2. Connect your gas supply or valve to the 1/4 inch BSP threaded hole.
3.11 Leak test the system
Leak-test the system and seal any leaks found after you have installed the pump, to prevent leakage of substances
out of the system and leakage of air into the system.
WARNING
Connect the pump outlet to a suitable treatment plant to prevent the discharge of dangerous gases
and vapours to the surrounding atmosphere.
WARNING
Use a catchpot to prevent the drainage of contaminated condensate back into the pump.