Humboldt HM-4165 3-Cell Manual Control Panel - Manual (Page 5)

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which connects to the volume change device. This adapter is supplied
with the panel.
TRIAXIAL CELL CONNECTION
The triaxial cell has compression fittings on the front as shown in
Figure 4. The cell connection on the triaxial cell connects to the water
connection at the Cell connection on the front of the panel. The base
connection on the triaxial cell connects to the volume change device as
shown in Figure 2 and not directly to the panel.
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 as shown in
Figure 2.
ELECTRICAL CONNECTION
The only electrical connection required is to connect the AC to DC
transformer into the back of the digital display and then plug the
transformer into a 110/220 VAC electrical socket as in Figure 5.
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 a total of seven regulators on the panel. The main regulator,
located below the gauge labeled SYSTEM AIR PRESSURE, controls the
supply of air for all of the other regulators. There are six regulators on
the front of the panel near the center which control the output pressure
to the bladder cylinders for cell pressure and back pressure control.
There is also a small regulator at the front of the panel in the upper
right corner labeled AUXILIARY AIR PRESSURE. This regulator is used to
control up to 10 psi of pressure to assist in the purging of water either
from the triaxial cell or from 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.