Sop 1; Internal Settings For Different Pump Heads; Checking The Internal Pump Head Setting - Knauer K-120 Handbuch

10

SOP 1

SOP 2
Fig. 5

Internal settings for different pump heads

1. Powering up the pump, the firmware version number will be
indicated for a few seconds.
When the version number is presented, press the ∆ arrow
2.
key, the arrow key and then the
∇
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.
Push the ∆ key, when the requested setting is selected. The
5.
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.

Checking the internal pump head setting

1. Switch on the power supply without starting the pump.
Press the ∆ key until the display stops changing. You can
2.
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
10
8
6
4
2
0
0 50 100
Deviation of the actual flow rate from the preset value in
dependence on the back pressure (Example)
Operating the HPLC pump K-120
arrow key again
∆
150 200 250
Pressure [bar]
0,5 ml/min
0,7 ml/min
1 ml/min
2 ml/min
5 ml/min
8 ml/min
10 ml/min
300