AR 2000 Operator’s Manual
101
Step 6: Pressurizing/Depressurizing the Cell and Running
Experiments
When the cell is fully installed, it can be operated in either self-pressurization mode, in which the pressure
is due to the volatility of the sample, or in external pressurization mode, in which the pressure is provided
by an external source. The pressure achieved when the cell is used in self-pressurizing mode will depend
on the sample and temperature. As a guide, the vapor pressure of water at 150°C is about 4.76 bar (69 psi.).
When the cell has been assembled correctly as directed in this chapter, it can be pressurized. The manifold
contains a three-way valve. The three positions for the valve are shown in Figure 8.22.
Figure 8.22
Three-Way Valve Positions
Horizontal—Off
Isolation between the
pressure cell and the con-
nector block on the man-
ifold.
Vertical Down—Pressure
Build (external pressuriza-
tion mode)
Connection between the
pressure cell and the con-
nector block on the manifold.
Vertical Up—Pressure
Relief
Connection between the
pressure cell and atmo-
sphere.
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