Agilent Technologies 1290 Infinity User Manual page 147

Mobile phase and/or sample flows out of the wrong ports on LC
injection valve.
Probable cause
1
Sample is backing up on the valve needle guide.
Probable cause
1
2
3
4
Agilent 1290 Infinity LC Injectors HTC/HTS User Manual
The valve rotor is reversed (180 ° out of
alignment).
Syringe OD too small.
Valve needle seal leaks.
The needle penetration depth for the
injection valve is not set correctly.
The syringe Plunger speed is too high
resulting in excessive pressure in inlet.
LC Injector HTC/HTS Description and Installation
Suggested actions
Remove the rotor and reinstall in the correct
position. See "Installation"
Suggested actions
Check the syringe needle for correct Gauge
(Gauge 22 = OD 0.72 mm
Change valve needle seal (see
Guide" on page 112).
Adjust the Injection Valve Needle Penetration.
Reduce Inject Speed in method.
3
Troubleshooting
on page 108).
"Valve Needle
147