Humboldt HM-4160 FlexPanels - Manual (Page 18)

To make De-aired water, assuming a Nold De-aired unit or a De-aired water tank
has been connected to the panel, following these steps:
1.
Set the vacuum regulator to highest vacuum level.
2. Turn the Deaired Water Tank Valve in Section 3 of the Master Controller to
vacuum, which applies a vacuum to the De-aired Water Tank.
3. Fill the tank about three quarters full with water by turning the Fill/Drain
Valve to Fill. Once the tank is filled, turn valve to Off.
4. If using a Nold De-airing tank, turn the unit's motor on for 10 minutes prior
to testing. lf using a De-airing tank, apply vacuum for one hour. When water
has been De-aired turn valve to off.
Control Burette Groups
This section will discuss how the panel is used with a triaxial or permeability cell.
Humboldt FlexPanel Controls are organized into Groups consisting of three,
Control Burettes, each of which can be used to regulate pressure or volume
changes. There are a few differences in the controls for these burettes, which
are discussed below.
Pressure Selection Valve
The Selection Valve (A1) at the top of the section selects the type of pressure
input for the top of the burette assembly. It has four settings:
VACUUM—
In this position, the regulated vacuum from the master panel
or other vacuum connected to the service panel is connected to
the burette section. The vacuum is used to pull air out of the
water in the burette assemble or pull a partial vacuum on the
sample. The water can boil at high vacuum levels.
VENT— In this position, the Burette Section is vented to the atmosphere.
It is used to apply atmospheric pressure to the Burette Section.
OFF— In the off position, the top of the Burette Section is sealed off.
PRESSURE— In this position, the pressure, controlled by the regulator below
the valve is applied to the Burette Section,
This valve for all of the sections function the same.
It is used to apply atmospheric pressure to the top of the burette assembly. It is
used when filling the burette assembly before opening the valve. To vent close
one of the valves on the cell to isolate the cell from the panel. Turn valve (A1) to
the pressure position which connects the pressure from the regulator below the
valve to the top of the burette assemble.
Pressure Regulator
The Pressure Regulator controls the air pressure provided to the Pressure
Selection Valve, located above the Regulator. To set a pressure, lift the Toggle
Valve, located below the Pressure Regulator, and then, turn the Regulator while
monitoring the pressure on the digital display of the master panel.