10
Operating the HPLC pump K-120
SOP 1
Internal settings for different pump heads
1. Powering up the pump, the firmware version number will be
indicated for a few seconds.
2. When the version number is presented, press the
∆
arrow
key, the
∇
arrow key and then the
∆
arrow key again
3. On the display the actual setting
10.
or
50.
is blinking.
4. Pushing now the START/STOP key you can change the
setting. The additional setting
2.5
is not in use. If you choose
this setting, the pump can not operate.
5. Push
the
∆
key, when the requested setting is selected. The
display shows now
00.
, while the “
.
” is blinking.
6. Switch the pump off.
7. Adjust the trim potentiometer screw according to the new
pump head, see Fig. 4 on page 8.
8. Start your pump again by switching it on. It will be in the new
setting mode.
SOP 2
Checking the internal pump head setting
1. Switch on the power supply without starting the pump.
2. Press
the
∆
key until the display stops changing. You can
read now either
10
. or
50
.
3. Readjust to the requested flow rate.
The actually delivered flow rate is dependent on the back pressure
of the system. Fig. 5 shows an example for the dependence of the
delivered flow rate on the back pressure . The absolute deviation is
dependent upon the compressibility of the solvent and on the pump
performance.
Flow dependent on back pressure
0
2
4
6
8
10
0
50
100
150
200
250
300
Pressure
[bar]
Flow
[ml/min]
0,5 ml/min
0,7 ml/min
1 ml/min
2 ml/min
5 ml/min
8 ml/min
10 ml/min
Fig. 5
Deviation of the actual flow rate from the preset value in
dependence on the back pressure (Example)
