Bio-Rad Model 491 Prep Cell and Mini Prep Cell - Manual (Page 8)

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The buffer recirculation pump is also ground isolated as should be any pump used with this cell. During
normal operation, the buffer in the lower buffer chamber is circulated through the cooling core and routed
back into the sys tem via the buffer recirculation pump. The buffer flowing through the tub ing and the pump
is electri cally active. For this reason handle the tubing carefully while the power supply is on. Do not touch
any exposed liquid when the power supply is on. Tube connections should be made with the power
supply turned off. Both the recir culation pump and the recommended power supplies are ground isolated by
design to minimize the potential shock hazard. However, working around high voltage equipment in a
laboratory environment is potentially dangerous. As a result it is the user’s responsibility to always excercise
care in setting up and running elec trophore sis instruments. If a liquid leak occurs, always turn off the power
supply be fore correcting the problem.
During operation, do not expose the cell to ambient temperatures above 50 ˚C.
Important
This Bio-Rad instrument is designed and certified to meet IEC1010-1* safety standards. Certified products are
safe to use when operated in accordance with the instruction manual. This instrument should not be modified
or altered in any way. Alteration of this instrument will:
• Void the manufacturer's warranty
• Void the IEC1010-1 safety certification
• Create a potential safety hazard
Bio-Rad is not responsible for any injury or damage caused by the use of this instrument for purposes other
than for which it is intended or by modifications of the instrument not performed by Bio-Rad or an authorized
agent.
*IEC1010-1 is an internationally accepted electrical safety standard for laboratory instruments.
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