SECTION 5,
continued
57
5.2.2.1
Connecting Inlet and Outlet Tubing
Note: Use the tubing supplied with
the kit (or its equivalent). Tubing
lengths are approximate. Avoid
using excess tubing because it
causes air locking, and delays
response time of measurement.
1. Cut a 53-cm (21
in.) piece of clear,
1
/
8
-in
.
I.D. Tygon tubing, and install it
between the Flow-Cell Inlet Reservoir and Flow Valve Module inlet.
2. Cut a 31-cm (12
in.) piece of clear,
1
/
8
-in
.
I.D. Tygon tubing, and install it
between the Flow Valve Module outlet and the Flow-Cell inlet.
3. Cut two 25-cm (10 in.) pieces of clear,
1
/
8
-in
.
I.D. Tygon tubing, and
install them between the top and bottom Flow-Cell drain fittings and the
“Y” connector.
4. Cut a 11-cm (4
in.) piece of clear,
1
/
8
-in
.
I.D. Tygon tubing. Connect one end
to the remaining “Y” connector. Pass the tubing under the support stand base
as illustrated in Figure 12. Install the
1
/
8
x ¼-in. reducer on the other end of
the tubing.
5. Cut a 50-cm (20 in.) piece of clear, ¼-in. I.D. Tygon tubing for the drain line.
Connect one end to the
1
/
8
x ¼-in reducer, and run the other end to a
suitable drain.
The discharge end of the drain tube must be unrestricted and lower than the
instrument to prevent air locking and ensure proper drain flow. Locate the
instrument as close to the drain as is practical using the shortest length of
drain tubing possible.
The kit is supplied with 152 cm (5 ft.) of ¼-in. tubing. The system will not
drain properly if this length is exceeded. If the entire 152 cm is used, the end
of the drain tubing must discharge at a point at least 46 cm (15 in.) below the
center line of the instrument to ensure proper flow.
6. Connect the power supply to the
Power
Jack on the Flow Valve Module. Plug
the power supply into an appropriate wall receptacle.
5.2.2.2
Using the Automated Flow-Cell Kit
Note: Assemble the Flow Cell,
tubing and stand. Then, fill the
system with water to ensure all
connections are water tight before
inserting the Flow Cell into the
sample compartment of the
instrument. Once filled, inspect the
system for leaks. Also, make sure
the cell is clean, and there are no air
bubbles present. Air bubbles tend to
collect in areas that are not cleaned
thoroughly.
Thoroughly clean the Flow Cell (refer to 5.4 on page 62), and then apply a thin
coat of silicone oil to the outside of the cell (see on page 23). Install the Flow Cell
in the sample compartment, and press the inlet and outlet tubes into the slots
provided on the instrument's top enclosure (see Figure 13). Cover the cell with the
Flow-Cell Light Cover.
Flow through the Flow Cell is controlled by using the Valve Control switch on the
Flow Valve Module. The valve control is a three-position switch: Continuous
Open, Closed, and Momentary Open. The valve is closed in the center (Closed)
position. The valve remains open when the switch is in the up (Continuous Open)
position until the switch is moved to the center (Closed) position. The down
(Momentary Open) position must be pressed and held to open the valve; when
released it automatically returns to the center (Closed) position.
Note: The Flow-Cell Light Cover
must be installed at all times when
the Flow Cell is in use. The
instrument's cell cover does not
close when the Flow Cell is
installed.
Carefully add sample to the Inlet Reservoir to minimize entrapment of air bubbles
in the sample. Air bubbles create a false positive interference in turbidity
measurement. Always slowly pour sample down the inside edge of the reservoir.
Tài liệu sưu tầm của Trung Sơn - www.tschem.com.vn - 028.3811.9991 - [email protected]
Tài liệu sưu tầm của Trung Sơn - www.tschem.com.vn - 028.3811.9991 - [email protected]
