Agilent Technologies 1220 Infinity II LC User Manual

1220 Infinity II LC System User Manual 151
Test Functions and Calibration
9
Solvent Delivery System
Pressure Too High Check
This test checks the flow path for a blockage, and tries to identify the module
that is causing the blockage. If the blockage is in the autosampler, the test can
identify whether the blockage occurs in the needle or needle seat.
The pump and autosampler are necessary to run the Pressure Too High Check.
Pressure Too High Check Evaluation
Start Conditions
The pump and autosampler are brought to the READY state, and an operating
pressure of 200 bar is applied to the system.
The pump ripple is measured, and the start of the test is delayed until the
ripple is within the defined limits (typically 1 % of operating pressure).
Test Pa rt 1
Part 1 of the test tries to determine in which part of the system the pressure
problem lies.
After the system has achieved the start conditions, the autosampler valve is
switched from mainpass to bypass, and the pressure slice is tested against a
limit.
If the limit is exceeded, the pressure problem lies in the autosampler;
otherwise, it lies somewhere in the rest of the flow path.
Leaking seals or scratched plungers. Exchange the pump seals. Check the plungers
for scratches. Exchange if scratched.
Leaking outlet valve. Exchange the outlet valve.
Leaky damper. Exchange damper.
Table 32 Third plateau negative (pressure drop > 2 bar/min

Agilent Technologies 1220 Infinity II LC Specifications

General

Brand	Agilent Technologies
Model	1220 Infinity II LC
Category	Laboratory Equipment
Language	English