GE AKTAprime plus Operating Instructions Manual page 45

Table 5.1: User maintenance schedule
Interval
Daily
Weekly
Monthly
ÄKTAprime plus Operating Instructions 28-9597-89 AB
Action
Leak inspection
Wash the system flow
path
Calibrate pH electrode
(optional)
Check inlet filters
Replace on-line filter
(if applicable)
Flow restrictor
5.2 User maintenance schedule
Instructions/reference
Visually inspect the system for leaks.
1 For cleaning the flow path, see Cleaning-In-
Place, on page 46.
2 For leaving the system for a few days, see
Section 5.7 Storage, on page 49.
Calibrate the pH electrode (if applicable) accord-
ing to Monitor pH/C-900 User Manual.
Check the inlet filters visually and replace them
if necessary.
Replace the on-line filter.
Check that flow restrictor generates the follow-
ing back-pressure:
FR-904: 0.4 ±0.05 MPa
Check the back-pressure as follows:
1 Disconnect the flow restrictor.
2 Connect a tubing (approx. 1 m, i.d. 1 mm)
to the waste port (port 5) on the injection
valve. Set the injection valve manually to
Waste position. Put the open end in a waste
container.
3 Run the pump manually at 10 ml/min with
water. Note the back-pressure (Bp1) on the
pump display, or in the Run Data window.
4 Set the system to Pause and connect the
flow restrictor to the open end of the tubing
(observe the IN marking). Put the flow restric-
tor in the waste container.
5 Press Continue so that the pump run at 10
ml/min with water. Note the back-pressure
(Bp2) on the pump display, or in the Run
Data window.
6 Calculate the back-pressure generated by
the flow restrictor (Bp2-Bp1). Replace it if it
is not within limit.
5 Maintenance
45