ACQUITY UPLC : What is the static decay and dynamic leak test? - WKB8322

ENVIRONMENT

• ACQUITY UPLC
• ACQUITY UPLC I-class

ANSWER

Static Decay Test : This is performed when ICS version is lower than 1.50

The static decay test performs a pressure ramp up to the test pressure, and then monitors the pressure decay. It reports a pressure decay rate in psi/min and calculates leak rate in ul/min.

The static decay test is performed on one side of the pump (A or B) for a given test. The test first pressurizes the accumulator pump head and monitors the pressure decay, and then pressurizes the primary head and monitors the pressure decay again.

Spec: pass/fail criterion is measured with a threshold of 500 psi/min.

Dynamic Leak Test : This is performed when ICS version is 1.50 or higher

The dynamic leak test performs a pressure ramp-up, and then maintains constant pressure within the head during the test by moving the plunger. The leak rate is determined by the rate that the plunger moves during the test.

The dynamic leak test is performed on one side of the pump (A or B) for a given test. The test first pressurizes the accumulator pump head and monitors the plunger movement, and then pressurizes the primary head and monitors the plunger movement again.

Spec: pass/fail criterion is measured with a threshold of 150 nL/min.

ADDITIONAL INFORMATION

Note: 

• The default initial test pressure is 14000 psi for the accumulator head and 12000 psi for the primary. The test pressure for the accumulator can be changed, but the primary is always tested at 2000 psi below the accumulator.
• Testing should only be performed using new, clean solvent and the system should be thoroughly primed. Any remaining air in the system can cause the testing to fail.
• The tests should not be performed on new seals until they are exercised for at least 30 minutes at 14000 psi or the test may fail.

Pump A Accumulator Head Static Decay 

Pump A Primary Head Static Decay