- Retention time shift observed when mixing A:B solvents
- No shift observed when using premix at 100% A or 100% C
- No leaking observed
- No significant pressure issues or changes
- ACQUITY UPLC H-Class Quaternary Solvent Manager (QSM)
FIX or WORKAROUND
Replace the GPV.
- Gradient Proportioning Valve, Dual-Channel - 700005161
This part can be replaced only by a certified Waters engineer. Please contact your local field service specialist to order the part and schedule service.