Connecting Inlet And Outlet Tubing; Using The Manual Flow-Cell Kit - Hach 2100N Instruction Manual

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SECTION 5,
continued
5.2.1.3

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.
5.2.1.4

Using the Manual 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.
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.
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1. Cut a 53-cm (21 in.) piece of clear,
between the inlet reservoir and cell inlet.
2. Cut two 23-cm (9 in.) pieces of clear,
them between the top and bottom Flow Cell drain fittings and the "Y"
connector.
3. Cut a 2.5-cm (1 in.) piece of clear,
between the "Y" connector and the Collection Drain Assembly.
4. Cut a 50-cm (20 in.) length of clear,
line. Connect one end to the drain barb on the Collection Drain Assembly, and
run the other end to a suitable drain.
The discharge end of the drain tube must be unrestricted and lower than the
instrument for proper drain flow and prevention of air locking. 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
properly if this length is exceeded. If the entire 152-cm length 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.
Thoroughly clean the flow cell (refer to Section 5.4). Apply a thin coat of silicone
oil to the outside of the flow cell (see Section 2.6 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 11).
Cover the cell with the Flow-Cell Light Cover.
Control the flow rate through the Flow Cell by adjusting the height of the
Collection Drain Assembly on the Support Rod. Position the bottom of the
Collection Drain Assembly a minimum of 7.5 cm (3 in.) above the support stand
base. Raise the Collection Drain Assembly on the Support Rod to decrease the
rate of flow. Lower the Collection Drain Assembly until it rests against the
support base to purge the Flow Cell of sample.
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.
55
1
/ -in I.D. Tygon tubing, and install it
8 .
1
/ -in. I.D. Tygon tubing, and install
8
1
/ -in. I.D. Tygon tubing, and install it
8
3
/ -in I.D. Tygon tubing for the drain
8 .
3
/ -in tubing. The system will not drain
8 .