Environmental Express HotBlock Ogden 3200 - Manual (Page 10)

HotBlock Temperature Settings:
The pre-set factory “Control Point” temperature is 115 °C. Factory tests have shown that this temperature is “sea level safe”.
Liquids in uncovered polypropylene tubes should not boil at this setting. If watch glasses are being used, this setting should be
lowered to avoid boiling. The block temperature should be optimized for the specific digestion conditions. PLEASE NOTE that
the block temperature is different than the temperature of the liquids being digested.The temperature of the liquid contents of
the digestion cup will vary with:
A. The material being digested.
B. The number of samples being digested .
C. The air movement of the digestion area.
D. The addition of a watch glass
Note:The maximum use temperature of the polypropylene cup is 130°C. Also please note that the temperature display is
not the temperature of the sample. Sample temperature will almost always be 5-15° less than the display temperature.
Adjusting the Temperature of Your HotBlock:
1. Turn the Hot Block on and wait until the display shows the current block temperature.
2. Press the up arrow key. The display will show the Control Point temperature. The more brightly lit digit can be
changed by holdiing down the up or down arrow keys. The digits will scroll from 0-9. Release button when
desired value is reached.
3. To change to another digit, “tap” the up arrow key. When the correct digit is highlighted, hold down the up or
down arrow to change the setting.
4. When the proper Control Point is set, no further action is necessary. The display will return to the current
temperature in about 10 seconds.
Tuning Your Hotblock:
Each Hot Block should be tuned at the temperature that it is to be operated. Tuning enables the Hot lock to achieve its set
point temperature without any overshoot. Tuning of the Hot Block is done at the factory at 115°C. If the block is operated
at a temperature significantly different from 115°C, it may be advisable to re-tune the block to prevent overshooting the
set point temperature. To tune the Hot Blockwith the ETR-3200 controller follow these steps:
1. Tuning should be started when the block is near room temperature.
2. Turn the Hot Block off and back on.
3. When the display shows the current temperature, hold down the up and down arrow keys simultaneously for four
seconds and release. The display will flash on and off indicating that the Hot Block is autotuning.
4. When the temperature reaches the set value, the Hot Block will be tuned and the parameters will automatically be
stored in the controller’s memory. At this point the display will stop flashing.
Safe-Sample TM Temperature Protection:
Your Hot Block is protected from runaway temperatures by a failsafe alarm system. In the unlikely event that the heating
system fails to respond to the controller, the Safe-Sample system will automatically shut the system off and sound an
audible alarm. This alarm sequence occurs if the actual temperature of the block reaches a temperature that is ten degrees
higher than the set temperature. If this should occur, the Hot Block will stop heating, preventing the loss of samples. The
Hot Block must be turned off and turned back on to reset the alarm.
Call 1.800.343.5319 Environmental Express • 9
Adjusting the Temperature of Your HotBlock TM
HotBlock Operation Guide