4-36 | Model 933S UV Analyzer
Column Block Temperature Control
The Column Block temperature (measuring range is from 0 °C to 120 °C)
is controlled by an RTD and heater so that it maintains consistent elution
time. The operation of the Columns is optimal at 40 °C. As the tempera-
ture is increased from 40 °C to 50 °C, the Columns will have to be switched
more frequently. The temperature Setpoint is set at the factory using the
ambient temperature data that is specific to the application and location.
The Column Block temperature control is protected by an independent
over-temperature circuit with a trip temperature of 65 °C. The default Col-
umn Block temperature Setpoint is typically 40 °C but can be modified in
the software to 50 °C (maximum) to allow for a higher ambient temperature.
The Column temperature Setpoint should be greater than, or equal to,
the maximum ambient temperature around the analyzer. The acceptable
range of the setpoint temperature is between 40 °C and 50 °C (maximum).
For applications with maximum ambient temperature of 40 °C and be-
low, a default setpoint temperature of 40 °C is used. For applications with
maximum ambient temperatures between 40 °C and 50 °C, set the Setpoint
to 50 °C. Do not increase the Column setpoint temperature unless you
are sure that the ambient temperature will periodically exceed 40 °C.
The Column Too Hot setpoint should be 5 °C to 10 °C above the Column
Setpoint temperature. The Column Too Cold setpoint should be 5 °C to
10 °C below the Column Setpoint temperature. Both setpoints are set at the
factory using the ambient temperature data specific to the application. If
the Column Block temperature falls below its Too Cold setpoint or exceeds
its Too Hot setpoint, the “f: Column temp too low” or “w: Column temp
too high” will be triggered and displayed in the software.
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