Bio-Rad Econo Gradient Pump Kits - Manual (Page 7)

Your Econo Gradient Pump was carefully tested at the factory and
was shipped in good working order. If any part is missing or
damaged, contact your local Bio-Rad office immediately.
2.2 VOLTAGE CONVERSION
Warning: The Econo Gradient Pump is shipped in its 100/120 V
configuration. To operate at 220/240 V, refer to the procedure in
section 7, Cleaning and Maintenance, to make the conversion.
Failure to follow this procedure may result in damage to the unit and
invalidation of the warranty.
Unpacking
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