Edwards ELD500 Series

D135-10-880C - Installation
Page 31
Gas ballast connection
For the mode gas ballast it is recommended to use helium-free gases at atmospheric
pressure. Ambient air can be contaminated with helium due to spraying or charging. In this
case a gas supply line (that is, nitrogen, fresh air, and so forth) should be connected to the
hose coupling, Figure 9 item 3. The pressure of these gas line must not exceed 1050 mbar.
The connectors 1,2 and 3 in Figure 9 are quick connectors for hose diameters of 8/6 mm.
Connection of an external pump (only ELD500 FLEX)
The ELD500 FLEX offers two possibilities to connect the external fore vacuum pump to the DN
25 KF flange. One on the side of the ELD500 or one in the bottom (measurements see
Figures 5, 6 and 7). As default setting the flange on the side is chosen. To change the
connection proceed as follows:
1. Take of the mechanical hood, see chapter Opening of the ELD500.
2. Loose the flange with the connection piece on the side of the ELD500.
3. Disconnect the blind flange on the bottom, therefore lay the ELD500 carefully on the
electronic hood.
4. Screw in the connection piece into the flange in the bottom.
5. Connect the hose for the fore vacuum pump.
6. Connect the blind flange to the sidewise flange.
7. Put on the mechanical hood.