Hach DR2400, Manual

Page: 29 / 66

General Instrument Operation
General Instrument Operation
5940018Operation.fm
Page 29
2.10 Installing the Pour-Thru Cell
Install the Pour-Thru cell in the spectrophotometer as follows:
1. Place the multi-pathlength cell adapter into the cell holder. See Sample Cell
Adapters on page 26 for adapter installation instructions.
2. Examine the Pour-Thru Cell. Make sure the cell is clean and that there are no
smudges or fingerprints on the cell faces.
3. Use 1/8” tubing to attach the inlet port of the Pour-Thru Cell to the glass
funnel. Attach the outlet port to the stand pipe.
4. Insert the Pour-Thru Cell into the adapter and seat it into the slots on the top
of the adapter for the desired orientation. To select the 1-in./25.4-mm
pathlength, orient the cell so that the 1-in./25.4-mm pathlength is parallel to
the front of the instrument. The 1-cm pathlength is selected by placing the cell
into the adapter with the 1-in./25.4-mm pathlength perpendicular to the front
of the instrument. The outlet port of the cell must be at the back of the cell
compartment for proper installation of the 1-cm pathlength.
Note: The light of the optical system of the instrument passes right to left as viewed from the
front of the instrument.
5. To ensure proper drainage for the funnel, adjust the relative heights of the
stand pipe and funnel as shown in
Figure 10 . Adjust the stand pipe so that the
inlet is 5 cm (2 inches) below the tip of the funnel, so that the funnel drains
completely.
6. Pour 25 to 50 mL of deionized water into the funnel and allow the funnel to
drain. If necessary, move the stand pipe up or down until the funnel drains
smoothly and stops draining at the correct level.
The drain tube attached to the stand pipe must drain freely. It should always
remain below the outlet of the stand pipe, and should run horizontally.
Preferably, the entire tube should be as short as possible with the outlet end
inserted into a drain (or suitable collecting vessel, if treatment is necessary before
discharge).
The 10-mL procedures cannot be used with the Pour-Thru Cell because 10 mL is
not enough to completely flush out the previous sample. Procedures with 10 mL
as the final volume can be used with optional 25-mL reagents so that the
Pour-Thru Cell can be used where procedures allow it.
2.11 Using the Pour-Thru Cell
Most of the DR/2400 Hach Programs specify the use of 25-mm round cells. The
Pour-thru Cell and its 1-in./25-mm pathlength can be used as a replacement in
most of these DR/2400 Hach Programs.
Note: For more information, see Correcting for a Diluted Sample, Running a Standard Adjust and
Creating a User Program Based on a Hach Program in the DR/2400 Portable
Spectrophotometer Instrument Manual.