3
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 ¼ inch to 1/8 inch push-to-
connect adapter to allow the attachment of ¼ inch tubing from the
panel to the 1/8 inch OD tubing which connects to the volume change
device. This adapter is supplied with the panel. The Automatic Volume
Change device also connects to the solenoid valve on the triaxial cell as
shown in Figure 4. The solenoid valve has a compression fitting.
TRIAXIAL CELL CONNECTION
The triaxial cell has compression fittings on the front as shown in Figure
4. The Cell connection on the triaxial cell (valve V3 in Figure 4) connects
to the Cell port connection on the front of the panel (see Figure 2).
DE-AIRING TANK CONNECTION
The de-airing tank has connections for the tap water in, de-aerated
water out, and air/vacuum lines. These lines connect to the back side of
the panel at the corresponding push-to-connect fittings located adjacent
to the input connections for compressed air, vacuum, tap water, and
drain.
ELECTRICAL CONNECTION
There are no electrical connections required on the HM-4155
Distribution Panel.
OPERATION
After making all of the necessary connections, check to make sure all
of the valves on the front of the panel are set to the off position. Also,
loosen the jam nuts on the regulators as shown in Figure 3.
AIR PRESSURE ADJUSTMENT
There are two separate regulators on the panel. The main regulator,
located below the gauge labeled SYSTEM AIR PRESSURE, controls the
supply of air for all air connections on the front of the panel and also for
the auxiliary regulator. The auxiliary regulator labeled AUXILIARY AIR
PRESSURE in the upper right corner controls the air pressure up to 10
psi for the auxiliary air pressure port and for the de-airing tank to assist
in draining the de-airing tank. This regulator has a locking knob which
must be pulled out to adjust the pressure or pushed in to lock it into
position (Figure 5).
AIR/WATER CONTROL VALVES
There are several control valves on the panel for on/off operation of
the air and water control. There are two valves under the De-Airing
Tank heading (Figure 6). These valves control flow of water to and from
the de-airing tank and air or vacuum to the tank. The water flow valve
either allows tap water to fill the tank or allows the tank to be drained
for cleaning and maintenance. The other valve is for the application of
