ChromeGate 3.3.2 Software Manual - KNAUER Advanced Scientific ...

132 Creating an Instrument Control Method
Fig. 190 Setup window, Knauer Switching Valves, Comments
Pretreatment
Checking this option the Setup… button becomes active. Clicking on it
the following dialog window will be opened:
Fig. 191 Pretreatment setting dialog window
The appearance of the valve program corresponds to that of the main
valve setup window. It must be edited in the same way as described
above. To add a new line, make a right mouse click into the table and
select “Insert line” from the menu. The only difference is that negative
times must be entered, because they are relative to the zero injection
time.
If a pretreatment is to define for more than one instrument (pump
and/or valve drive) in a method, it is required to set for all of them
the same earliest time. All pretreatment procedures will start
simultaneously.
If a pump should exactly switch off after 5 minutes of pretreatment,
include a line with 0 ml/min flow into the pretreatment’s pump
program. Otherwise the pump may run for a longer time as it need
some seconds to load the new flow rate from the method’s “normal”
pump program
An example for both:
A pump should run for exactly 5 minutes before the injection and a valve
should switch 2 minutes before injection from position 2 to position 5,
means, 3 minutes after the pump’s pretreatment is started. Here are the
setup tables create a time table for the valve, which starts with -5
minutes:
Pump
-5.04 min 1 ml/min
-0.04 min 1 ml/min
-0.02 min 0 ml/min
0.00 min 0 ml/min