Agilent TwisTorr 305-IC Manuel De L'utilisateur page 223

Technical Information
Installing an inlet screen will reduce the pumping speed by the following amount:
Table 2
X3500-68000
X3500-68001
The inlet screen is fitted in the upper part of the pump, as shown in the figure.
Figure 58
The screen can be mounted on each pump.
The screen can be removed as shown in the following figure.
Agilent TwisTorr 305-IC User Manual
Reduction in pumping speed (%)
Ar N
2
20% 18%
He H
2
7% 5%
223