Bio-Rad CHEF-DR II System - Manual (Page 4)

Section 1
General Information
The Cooling Module has been specifically designed as a stand alone, portable refrigerat-
ed apparatus for use with the CHEF-DR ® II, CHEF-DR III, GenePath ® , and CHEF Mapper ®
pulsed-field instruments. Electrophoresis buffer is circulated from the electrophoresis
chamber by the variable speed pump, cooled directly by the liquid refrigerant in a heat
exchanger within the Cooling Module, and returned to the electrophoresis chamber. The heat
exchanger is electrically isolated from the chassis, compressor, and plumbing to eliminate
electrical shock hazard.
The Cooling Module maintains a constant buffer temperature typically within 1 °C of
the set temperature (after stabilization) in an operating range of 5–25 °C for a total buffer
capacity of 2.2 liters at a flow rate of 1.0 liter/minute. Maximum buffer cooling capacity is
75 Watts (255 BTU) of input power at a set temperature of 14 °C
Fig. 1. Cooling Module. A. Main power switch. B. FLOW IN port. C. FLOW OUT port. D. Control panel.
E. Electrophoresis chamber internal temperature probe port and fuse (back of unit).
1
A
B C
D
E