Humboldt HM-4165 3-Cell Manual Control Panel - Manual (Page 4)

2
are for de-aerated water return from the de-airing tank, tap water going
to the de-airing tank, and air/vacuum to the de-airing tank respectively.
On the face of the panel are the connections for air pressure outputs to
the HM-4151A Bladder Air/Water Cylinders for cell pressure and back
pressure, tap water and de-aerated water for the bladder cylinders,
automatic volume change, and the triaxial cell. Also, there is an auxiliary
pressure connection for air pressure up to 10 psi and an auxiliary vacuum
connection. These connections are made using quick disconnect style
fittings. These fittings have a barbed end and a nut which fits over
the tubing to clamp the tubing on to the barbed end of the fitting.
To disconnect the fittings from the panel, push down on the tab at the
top of the socket half of the fitting as shown in Figure 3. The plug half
of the fitting will pop outward. To reconnect it, just push the plug
into the socket until the tab clicks and locks the plug in place. The
connection for the tap water to the base of the sample via the volume
change device requires a 1/4" to 1/8" push-to-connect adapter to allow
the attachment of 1/4" tubing from the panel to the 1/8" OD tubing
which connects to the volume change device. This adapter is supplied
with the panel.
BLADDER CYLINDER CONNECTION
The bladder cylinders have push to connect style fittings at the bottom
of the assembly. These fittings use the ¼ inch OD tubing and attach
the by the same method as the fittings on the back side of the panel.
The center fitting is for air pressure from the right side of the panel. The
other push-to-connect fitting is for water from the connections on the
front of the panel. There are two bladder cylinders required per triaxial
cell. One bladder cylinder is for cell pressure and tap water supply, the
other cylinder is for back pressure and de-aerated sample water supply.
The air pressure line for one of the bladder cylinders will connect to the
Cell air pressure connection on the front of the panel and the water line
for that bladder cylinder will connect to the Bladder A connection on
the front of the panel. The air line for the second bladder cylinder will
connect to the pore water pressure (PWP) connection on the front of the
panel and the water line for the second bladder cylinder will connect to
the Bladder B connection on the front of the panel as shown in Figure 2.
AUTO VOLUME CHANGE CONNECTION
The Automatic Volume Change Device has push-to-connect fittings for
1/8" OD tubing. The volume change device is connected to the panel at
the Base connection on the front of the panel as shown in Figure 2. The
connection for the tap water to the base of the sample via the volume
change device requires a 1/4" to 1/8" push-to-connect adapter to allow
the attachment of 1/4" tubing from the panel to the 1/8" OD tubing