User`s guide
4-12
Operation 4
By using this procedure, each of the three outputs
can be manually set to be open or closed. The
outputs will remain in this state until a method
program is run and a change in the outputs is
programmed.
# The default state is open.
• Press Next and go to the next menu.
Pause Prog With/Without Flow
This option runs in Program mode only. It enables
the system to be controlled from an external sensor.
For example, a temperature sensor can be used to
pause the system if the temperature is outside a
desired range. The program and flow can be
paused together, or the program can be paused
whilst the flow rate continues. External parameters
such as temperature, pressure, or composition can
be monitored to control the system.
Gradient Profile
This function only operates in the program mode,
and enables a selected gradient profile to be output
to a recorder from the analog output of the 305.
The gradient profile can be selected as being a
solvent composition, %B or %C or the flow rate
(Flow). The solvent composition can be useful for
biochromatographic applications for plotting pH
gradients and salinity (salt concentration) gradients.
The flow rate can be useful for verifying detector
stability.
The analog output gives 1 V full scale. The full scale
represents 100%B, 100%C or 100% of the maximum
possible (not programmed) flow rate of the system.
This output is from connectors 12 and 13 on the I/O
connector at the back of the 305. Pin 13 is the ground
(0 V) connection.
Options are: Flow, %B, %C.
# The default setting is Flow.
• Press the Change soft key to select your desired
output and press Enter.
Setting Up the Pump
Setting the outputs manually is
useful to check that output # 1
turns on the integrator for
example. However, when
repeating the same operation
many times, it is better to
program the output operations
as part of a method program. In
this way, the outputs will
follow the same sequence each
time the method program is
run. Refer to programming the
outputs in Section 3 of this
Chapter.