Humboldt HM-4165 Manuale utente

product manual

03.11

HM-4165

3-Cell Manual Control Panel

INTRODUCTION

The HM-4165 Pressure Control/Distribution Panel is designed to

control cell and back pressure outputs for up to three triaxial cells.

A digital pressure display allows the monitoring of the pressure of each

output individually. The HM-4165 panel includes the air and water

distribution capabilities including tap water, as well as de-aerated water.

The panel also controls the vacuum necessary to remove air from the tap

water in the de-airing tank. The digital pressure gauge is powered by an

AC to DC transformer and a 110/220 VAC power source is required. A

supply of compressed air is necessary as well as vacuum, tap water, and

a drain to allow water to be removed from the test apparatus.

INSTALLATION

The HM-4165 is a simple bench mounted system, which requires no

ﬁxed mounting.

PANEL MOUNTING

A pair of supporting feet is supplied with the panel so that it can be

bench mounted and remain stable. Screws, nuts, and washers for the

support feet are supplied so that the support feet can be attached as

shown in Figure 1.

AIR/WATER CONNECTIONS

All connections will require either 1/4 inch OD or 1/8 inch OD ﬂexible

tubing. However, metric adapters are available to allow connecting the

¼ inch tubing to 6 mm tubing.

PANEL CONNECTIONS

The panel is equipped with push-to-connect-style ﬁttings on the back

side of the panel frame. It is necessary to use 1/4" OD ﬂexible tubing

to make the connections. Figure 2 shows how the connections are to be

made with air and water sources, as well as connections to the triaxial

cell and other equipment. The panel is designed to accommodate 3

triaxial test apparatuses simultaneously. However, only the connections

for one triaxial test apparatus are shown in the ﬁgure. The two remaining

test apparatuses connect to their respective connection locations. Insert

the tubing into the ﬁttings. The seal in the ﬁtting will resist the tubing

and a little extra force will be required to get the tubing to pass through

the seal in the ﬁtting. To make sure the ﬁtting is in all the way, lightly

pull on the tubing. If it comes out of the ﬁtting, it was not inserted

completely. While facing the back of the panel, the four connections

starting from the left are for the water drain, tap water input, vacuum

input, and compressed air input respectively. The last three connections

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

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.

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 vacuum to the de-airing tank to

remove air from the water in the tank and it also allows compressed air

to be pumped into the tank to assist in draining the water from the tank.

The small auxiliary regulator controls the amount of pressure to assist in

draining the water from the de-airing tank. Set the desired pressure by

turning the knob on the auxiliary regulator in the clockwise direction.

NOTE: These valves must be in the off position during a test.

There are three valves under the AIR CONNECTION heading (Figure

7) on the front of the panel (one valve per triaxial cell). These valves

connect the digital display to the corresponding regulators so that the

pressure for any individual air line can be displayed one at a time.

When the valve is in the off position, the pressure is still controlled by

the regulator. NOTE: When the pressure is displayed for one of the cell

air connections, the other cell air valves must be in the OFF position or

else the incorrect pressure will be displayed.

There are six valves under the WATER CONNECTION heading. There

are two valves for each triaxial cell apparatus which are used to control

the ﬂow of tap water to the cell and to the corresponding bladder

cylinder and also de-aerated water to the Auto Volume Change and to

the other bladder cylinder in the apparatus (Figure 8). When the valve

is in the FILL position, water ﬂows to the cell and bladder cylinder at the

same time, or to the second bladder cylinder and to the Auto Volume

Change at the same time. The CELL valve has drain position which

allows water to be drained from the cell. NOTE: These valves should be

in the off position during a test. The valve is in the off position when the

knob is pointed to the left.

PRESSURE GAUGES

There are two pressure gauges on the panel. The gauge at the upper

left side is used to monitor the pressure regulated by the main pressure

input regulator. It is a mechanical gauge and requires no electrical

source. The other gauge has a digital display and is used to monitor the

air pressure in the bladder cylinders which control the pressure in the

cell and the back pressure in the sample. To operate this gauge, it must

ﬁrst be connected to an AC power source. It has an On/Off button on

the left side of the display.

AIR FILTER

There is an in-line air ﬁlter which ﬁlters the incoming air from the

compressed air source. It also traps water and other ﬂuids in the line.

MAINTENANCE

There is very little maintenance required. The digital gauge operates

with AC power. If the gauge fails to operate, ﬁrst check the transformer

to determine if it is operational.

The air ﬁlter should be checked every day to determine if the white ﬁlter

element is dirty or if ﬂuid must be drained from the clear plastic bowl.

To remove water or ﬂuids from the bowl, turn the black knob at the

bottom of the clear plastic bowl. To purge the ﬂuids from the bowl, turn

the knob as if tightening a right handed screw and the ﬂuids will drain

out of the bottom. To close it, turn the knob as if loosening the screw.

Caution: The ﬁlter may be under pressure. If so, the ﬂuids will spray out

at high velocity.

If the ﬁlter becomes dirty and clogged, open the drain plug as described

above to relieve pressure. Remove the bowl by rotating the bowl

counterclockwise to unscrew it from the ﬁlter body. Be careful not to

lose or damage the o-ring that seals the bowl to the body of the ﬁlter.

Next, unscrew the ﬁlter support by turning it clockwise until it comes off.

Slide the ﬁlter element off of the support and replace it with a new ﬁlter.

Reassemble the air ﬁlter assembly in the reverse order.

FIGURE 1

MOUNTING FEET ASSEMBLY

8-32 UNC NUT WITH WASHER

8-32 UNC MACHINE SCREW

Figure 1: Mounting Feet Assembly

HM-2310.20

DISPLACEMENT

TRANSDUCER

HM-4170

PWP

HM-2300.020

LOAD CELL

HM-4199B

TRIAXIAL CELL

HM-3000

DIGITAL MASTER LOADER

HM-4187A.3F

DE-AIRING TANK

HM-2310.10

DISPLACEMENT

TRANSDUCER

HM-2315

VOLUME

CHANGE

DEVICE

HM-4151A

BLADDER

AIR/WATER CYLINDER

HM-4165

DISTRIBUTION

PANEL

COMPRESSED

AIR

VACUUM

TAP

WATER

DRAIN

HUMBOLDT MFG. CO.

MANUALLY CONTROLLED 3 TRIAXIAL CELL SYSTEM

TO CELL VALVE

TO BASE VALVE

FIGURE 2

Figure 2

LOOSEN JAM NUT

PRIOR TO ADJUSTING

AIR PRESSURE

PUSH DOWN

TO RELEASE

CONNECTOR

FIGURE 3

Figure 3

Figure 4 Triaxial Cell

PRESSURE

TRANSDUCER

TO CELL

TO BASE

AIR BLEED

VALVE

FIGURE 4

TRIAXIAL CELL

Figure 5B

Figure 5Figure 5

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