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Environmental Express
• 5
HotBlock
®
TKN:
Operation & Instruction Manual
Operation Information
Operating Your HotBlock® TKN System
All HotBlock® TKN units come preprogrammed to run the digestion temperature
and time profiles outlined in EPA method 351.2. If other profiles are needed, see
the next section on how to program your controller.
Temperature Settings:
The pre-set factory “set point” temperature of your HotBlock® TKN is 160°C. This
is at or near the temperature frequently used for the initial digestion phase of
TKN analysis. Please note that the set point of the block is not the same as the
temperature of the liquids being digested. The block temperature should be
optimized for the specific digestion. The temperature of liquid contents of the
digestion cup will vary according to the material being digested, the number of
samples being digested, and the air movement of the digestion area.
Advanced Touch-Screen Controller:
1. Turn on the controller; wait for the opening screen to appear.
2. Touch the screen to proceed to the Main Menu Screen.
3. Select the “Global Settings” menu.
4. Touch the button for “Master” control and enter the passcode “9999”.
5. Return to the main screen and touch the button Single Control Station 1.
(
Note:
when using the HotBlock
®
TKN, you will only be able to control
one block).
6. Select the profile (1 –4) that you want to run.
7. Press the Start button to initiate the profile.
Simple Manual Controller:
1. Turn the controller on. It will begin to preheat to 160°C.
2. Once the temperature has stabilized at 160°C, press the green button.
3. The display will show ‘
nonE
’. Use the up arrow key to show ‘
ProF
’.
4. Press the green button twice. The ramp indicator light will come on showing that
a ramp/soak profile is active. This profile will follow the temperature and time
profile outlined in EPA method 351.2.
Note:
When preparing a sample for TKN digestion, it is important to mix it very
well. Use a vortex mixer for best results. This will prevent layering which can lead
to splashing and bumping during digestion.
