+1.800.343.5319 or +1.843.881.6560 envexp.com
Environmental Express
• 7
HotBlock
®
TKN:
Operation & Instruction Manual
Care & Maintenance
Maintenance
Any service inquiries should be directed to Environmental Express Technical Service
Department.
After each use, clean exterior surfaces with a damp sponge to remove acid residue.
For acid spills, sponge with a diluted solution of sodium bicarbonate followed
by distilled water. Acid that is spilled directly into the digestion wells should be
neutralized and removed.
Before using any cleaning or decontamination methods except those
recommended, check with Environmental Express to confirm the proposed method
will not damage your HotBlock® TKN unit.
Avoid excessive spills, as liquid allowed to overflow into the HotBlock® TKN casing
can severely damage electronic components.
The controller is independent from the block and should be placed outside the
fume hood to reduce the likelihood of acid damage.
Troubleshooting
The HotBlock® TKN contains no user serviceable parts. If you experience troubles
with heating, temperature accuracy, controller display, or any other issues, you
will need to send the affected portion of your system to Environmental Express for
repairs. Please contact one of our technical support staff to coordinate the repair
process.
To identify the defective area you will need to take the resistance of the heating
mat and RTD. This is done through the cord that connects the block to the
controller. Pins 1 and 2 are connected to the heating mat. For a 54-well block the
resistance should be 16 Ω. For a 28-well block the resistance should be 20 Ω.
Pins 6 and 7 are connected to the RTD. The resistance should be 110 Ω. If these
readings are correct the problems lies within the controller.
