CAUTION
Burn Hazard. Sample cells are hot. Wear thermal insulating material (e.g., gloves
or finger cots). Do not remove a sample cell that is greater than 80 °C. Do not put
a sample cell that is greater than 80 °C in a colorimeter.
CAUTION
Chemical Hazard. If a sample cell breaks, do not let the liquid touch skin. Use a
fume hood as necessary to remove chemical fumes.
NOTICE
To prevent sample cell and instrument damage, keep the openings in the heating
block dry. Dry the outside of sample cells fully.
NOTICE
To prevent instrument damage, immediately disconnect power if an accidental
spill occurs or a sample cell breaks, then clean the instrument. Refer to Clean the
instrument on page 9.
NOTICE
Do not cover the ventilation slits in the protective cover. The instrument and
sample cells may become too hot and decrease the accuracy of measurement.
1. Prepare the test sample cells as specified in the analysis procedure.
2. Close the sample cells with the cap.
3. Dry the outside of the sample cells fully.
4. Turn the instrument on and open the protective cover. The last
temperature program(s) selected is shown on the display.
5. If using 16 mm tubes with a heating block with 20 mm openings, put
reducing adapters in the openings.
6. Select the correct temperature program (and digestion period if
applicable) using the keys, then push OK. Refer to Stored programs
on page 8. The temperature program is selected independently
for each heating block when there are two heating blocks.
Note: To stop a program, push the key below the program two times.
7. When the heating block is at the selected temperature (two beeps
are heard), put the test sample cells in the correct heating block and
close the protective cover.
8. Push Start to start the program.
The time counts down to zero (0). Three beeps are heard and the
heater turns off when the program is completed.
Stored programs
Table 3 gives descriptions of the stored temperature programs.
Table 3 Stored programs
Program Description
COD Increases the temperature of the sample cells to 150 °C for
120 minutes. In the cooling phase, four beeps are heard when the
sample cells are at 120 °C. Remove and carefully invert the sample
cells several times, before letting them decrease in temperature in a
rack.
TOC Increases the temperature of the sample cells to 105 °C for
120 minutes. The TOC temperature program can be used for all Hach
TOC sample cell tests.
100 °C Increases the temperature of the sample cells to 100 °C for 30, 60 or
120 minutes. For example, the “100 °C, 60 minutes” temperature
program is used to:
• Digest samples using the Metals Prep Set
• Identify phosphate and chromium
• Digest heavy metals
105 °C Increases the temperature of the sample cells to 105 °C for 30, 60 or
120 minutes.
150 °C Increases the temperature of the sample cells to 150 °C for 30, 60 or
120 minutes.
165 °C Increases the temperature of the sample cells to 165 °C for 30, 60 or
120 minutes.
User programs
The instrument has three temperature programs that are configured by
the user (PRG1–PRG3).
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