Test Procedures
OQ/PQ Operating Instructions M1393R0 Page 39 of 60
4.12 Switchos Flow Rate and Pressure Stability Test
The Switchos is used for pre-concentration experiments. A stable loading flow is essential
for the sample transport to the trap column. The flow rate and pressure stability are
checked with a CHROMELEON program. A typical pressure profile for this test is presented
in FIGURE 4-13.
FIGURE 4-13 Typical Pressure Profile of the Switchos Loading Pump
4.12.1 Performing the test
a) Open the Helium shut-off valve on the bottle cap assembly and degas the solvent.
b) The four channels should be well flushed using the Purge function of the pump.
c) Connect a 30 µm I.D. tubing (P/N 160182) to port 2 of the Switchos valve A.
d) Connect the Switchos output to the port 1 of the Switchos valve A using a 130 µm I.D.
tubing (P/N 160180).
e) Connect port 10 to waste using the same type of tubing.
f) Start the Switchos pump from the panel.
g) After equilibration start the sequence ‘XQ_7_Switchos Pump Test_NAN’ (or ‘_CAP’,
respectively).
h) Measure the flow rate with a syringe and chronometer watch for 5 min
i) Verify that the parameters meet the specifications presented in TABLE 2-3 and fill in the
appropriate field in the ‘Other Tests’ page of the report. The result for the pressure
stability test is on the ‘Switchos’ page of the report.
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