Hach LT 200, User Manual, Page: 11 / 272

programs on page 11. 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.
LT 200: The digestion program starts. The temperature of the
heating block increases to the selected temperature, then the time
automatically counts down to zero (0). When the digestion program
is completed, three beeps are heard and the heater turns off.
DRB 200: The temperature of the heating block increases to the
selected temperature.
8. DRB 200: 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. Push
Start to start the
digestion program.
When the digestion program is completed, three beeps are heard
and the heater turns off.
6.2 Stored programs
Table 3 provides descriptions of the stored temperature programs for the
LT 200. Table 4 provides descriptions of the stored temperature
programs for the DRB 200.
Table 3 Stored programs—LT 200
Program Description
COD Increases the temperature of the sample cells to 148 °C for
120 minutes. In the cooling phase, four beeps are heard
when the sample cells are at 80 °C. Remove and carefully
invert the sample cells several times, before letting them
decrease in temperature in a rack.
The COD temperature program can be used for all COD
sample cell tests.
100 °C Increases the temperature of the sample cells to 100 °C for
10, 60 or 120 minutes.
For example, the “100 °C, 60 minutes” temperature
program is used to:
• Identify phosphate and chromium
• Digest heavy metals
• Digest samples using the LCW 902 Crack Set
40 °C Increases the temperature of the sample cells to 40 °C for
10 minutes.
For example, the “40 °C, 10 minutes” temperature program
is used for formaldehyde test or enzymatic food tests.
Table 4 Stored programs—DRB 200
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.
English 11