Pump Self Test
The Pump Self Test combines a Pump Leak Rate Test with several consecutive System Pressure Tests to determines the leak rates at various positions in the flow path of the Quaternary Pump. During the test either the leak rate or the flow restriction is determined, according to the run protocol, which can be configured during the test setup. The maximum pressure is 1000 bar for G4204A, G7104A and G7131A, and 800 bar for G7104C and G7131C, or automatically limited to a lower pressure by the other components in the system.
For running the tests, either a blank nut or the blind seat of an Agilent Sampler can be used to block the system. When the Mixer Restriction or Mixer Restriction are measured, a waste line has to be connected to port 4 when prompted by Lab Advisor. If any Leakage Test is activated, a full Pump Leak Rate Test is performed. Afterwards, the total system leakage is determined without filter and mixer in the flow path. If only a Restriction Test is done, no leakages will be determined.
You can choose from the following tests:
Pump Leakage: tests the leakage on the pump head components.
Mixer Leakage: tests the leakage of the mixer and its connections.
Filter Leakage: tests the leakage of the filter and its connections.
Total Valve Leakage: tests the leakage of the valve, mixer (if installed) and filter.
Mixer Restriction: calculates the restriction due to the mixer.
Filter Restriction: calculates the restriction due to the filter.
Pump Leakage:
The pump leakage is measured when any of the other leakage tests is selected. First, a full pump leak rate test is run, which can be limited to the maximum allowed system pressure. After that a pressure test is performed.
Mixer Leakage:
Determines the leakage at the mixer (if installed). The overall leak with the mixer in the flow path is determined and the value for the secondary leak is subtracted from it.
Filter Leakage:
The Filter Leakage is calculated by subtracting the result of a system pressure test with the filter in the flow path from the result of the system leakage determined before.
Total Valve Leakage:
The overall leak of the valve is measured with the mixer (if installed) and the filter. The result is subtracted from the system leakage determined before.
Filter Restriction:
The values of the back pressure of the pump at a flow of 1 mL/min with and without filter are compared.
Mixer Restriction:
The values of the back pressure of the pump at a flow of 1 mL/min with and without mixer are compared, the result for the filter restriction is subtracted.
Preparations:
Flush the system with HPLC grade water for several minutes from any solvent channel.
Start the Pump Self Test and choose the test you want to test the system with. The pressure will automatically adjust to best fit your system.
Choose if you want to use a blank nut or the sampler (only certain modules) to block the pump.
Choose the channel with HPLC grade water and if you want to include or skip an additional purging step.
Click OK and follow the instructions.
Evaluation:
The result as well as the applied limits are displayed after the automatic evaluation. The limits are:
The allowed leak limit for the secondary piston and for any other leakage is ≤ 3 µL/min.
The allowed leak limit for the primary piston is ≤ 30 µL/min
If the restriction for any of the filters is unreasonably high, consider exchanging the filter frits.
A report can be displayed, saved or printed by opening it with the Print Result.
If the test does not pass, check the system for leaks or call a local Agilent representative. Pump Self Test shows a typical test run.
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