68 Setting PowerLine Controller Operating Parameters
4. Move the cursor to the High field.
5. Enter a high-pressure limit value within the range 51 to 6000 psi (3.6 to 420
kg/cm
2
).
6. Press Enter.
Chart Out
Determines which signal is available at the Chart Out terminal on the rear panel of the
controller. This 0 to 10 mV signal can indicate the composition percentage of any one of
the four eluents (%A, %B, %C, or %D), the eluent flow rate (Flow), or the column
temperature (Temp).
To use this feature, connect the Chart Out terminals on the rear panel of the controller to
the 0 to 10 mV terminal on the recorder or integrator.
You can also connect this output signal to the second pen of a chart recorder or to a data
system. It is frequently used during troubleshooting to reflect a selected condition, such as
pump flow or eluent composition.
A time delay between the eluent composition shown by the Chart Out signal and the eluent
composition at the column inlet always occurs. This time delay is the system, or delay,
volume. The 600E system has been optimized to reduce the delay volume.
The detector signal is further delayed by the volume of the column. At a low flow rate,
with a column attached, the delay between an eluent changeover instruction and its
subsequent detection may be several minutes.
To set the Chart Out parameter:
1. Move the cursor to the Chart Out field.
2. Type the number for the desired output:
• 1, 2, 3, or 4 for the % composition of one of the four eluents (A, B, C, or D)
• 5 for flow rate
• 6 for column heater temperature
3. Press Enter.
Flow Factor
Speeds up or slows down the pump to compensate for differences in pressure or eluent
compressibility. You enter a value here only if you need to match flow rate conditions
between systems or between different eluents.
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