2.8
Running-in the new pump
General
To be able to follow this section, you must know how to operate the
pump. Read through section 3 Operation before continuing.
Note: Running with air is not harmfull to the pump sealings.
However, the sealing ring lifetime might be shortened if the pump
pumps air for long periods.
The pump is tested at the factory prior to delivery and washed with
20% ethanol. Remains of this is removed by running-in the pump
with a liquid such as distilled water that is miscible with ethanol.
After running-in, the pump is primed for the chromatographic run.
Running-in
1 Submerge the inlet tubings in a suitable reservoir filled with
degassed distilled water. Place the outlet in a waste container.
2 Switch the mains power switch on the front panel to ON. A
selftest is carried out.
Note: When the pump is run for the first time after replacing a
sealing, friction between the glass cylinder and the dry sealing may
give rise to some noise. This will disappear when the sealing has
been wetted.
3 Leakage is tested by checking the pump pressure against a
blocked outlet using distilled water and a 5/16” stop plug. The
test is carried out from the pump dial and display. A chart
recorder connected to the analogue pressure output can be useful
to record the pressure reading during this test.
See section 4.5 Testing leakage for details.
4 Remove the stop plug and reconnect the outlet tubing. The pump
is then ready for operation. Before changing solvent, see section
3.9 Changing eluent.
Selftest
Please wait...
Pump P-920
User Manual 18-1125-54 Edition AB
7
Installation
2
18-1125-54_ab.qxd 1998-10-22 12:49 Sida 7 (1,1)
