Left-hand control port – Visible only when the column-compartment tray is slid to the right
for the extended CH-A configuration. When installed in the left-hand control port, the APH
assembly directs flow from left to right within the compartment.
Column-compartment trough – Contains the column with optional column in-line filter or
guard column and active preheater (APH) assembly.
APH assembly – Installed in the right-hand control port for standard CH-A configuration.
When installed in the right-hand control port, the APH assembly directs flow from right to left
within the compartment.
eCord fob receptacle
APH retainer clip
1.2 Column heater
You can set the column compartment temperature from 20.0 to 90.0 ºC, in 0.1 ºC increments. The
compartment controllable temperatures range from 5 ºC above ambient to 90.0 ºC.
A receptacle on the column heater module receives the column's eCord fob, if one is present.
The eCord records column manufacturing and usage data that is accessible from the Waters
console. For more information about the recorded column data, see "
The column heater module does not have its own power supply; it draws power from the sample
manager. Thus, the column heater automatically powers-on when you power-on the sample
manager.
1.2.1 Column heater operation
The column heater module controls the ambient air temperature around the column, as well as
the solvent before it enters the column. When the temperature is set, either directly from the
console or within a method, a command is sent to the column heater to switch the compartment
heating element on or off. On the basis of feedback from the compartment thermistor, the heating
element continues to heat until the compartment achieves the specified temperature set point. It
then holds the temperature stable at set point.
Recommendation:
When sample and column temperature are important to an application, in
addition to specifying explicit temperature set points in the method, specify appropriate
temperature limits. Together, these settings ensure that system operation occurs only within the
defined limits, and that any occurrence of an unacceptable deviation from the set points is flagged
by an error message acknowledging the variance.
December 4, 2019, 715005052 Version 02 (previously released as Rev.B)
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