Introduction 
20  Agilent Cary 3500 UV-Vis Spectrophotometer User’s Guide 
Both modules employ fiber optic technology to split and distribute light from the 
engine to each of their measurement channels.  
The Compact UV-Vis module has 2 measurement channels: sample and 
reference/blank. The Multicell module provides 8 measurement channels. Both 
modules come as ambient or Peltier variants. 
Cary Multicell Ambient and Peltier 
This module provides thermal control of the 8 cuvette stations. Control is arranged 
in 4 zones each containing one channel pair (positions 1/2, 3/4, etc.).  
For the Peltier version, the temperature of each zone can be varied over a range of 
0 to 110 °C and can be controlled based on either the temperature of the cell holder 
(block) or the temperature of the sample by using the sample temperature probe 
accessory. The Multizone feature allows for individual control of each zone. 
 
Hot surface 
The sample compartment and cuvettes may become extremely hot during 
instrument operation and remain hot for some time after the temperature 
has reduced. Allow the sample compartment and cuvettes to cool for at 
least five minutes before attempting to remove cuvettes.  
 
Laboratory conditions directly affect temperature control. Because this is an air-
cooled system, when working at the lower temperature ranges, the laboratory 
conditions must meet the lower end of the Environmental Specifications.  
 
Compact Ambient and Peltier 
This module provides thermal control of the two cuvette positions.  
The Peltier version provides similar thermal control as Multicell Peltier in one 
channel pair (zone). Control may be based on either the cell holder (block) or the 
actual sample temperature by using the sample temperature probe accessory.