Identifying A Leaking Check Valve - Thermo Scientific EASY-nLC 1200 Troubleshooting And Maintenance Manual

Identifying a Leaking Check Valve

Thermo Scientific
The EASY-nLC instrument has four check valves. Each solvent inlet line connects to a check
valve assembly with a solvent-side check valve and a waste-side check valve.
CAUTION Wear powder-free gloves and safety glasses when handling parts of the LC system
that come into contact with solvents.
❖ To determine if the waste-side check valve is leaking
1. Run the Purge Solvent script as follows:
a. Press Maintenance > Scripts.
b. In the Category list, select Prepare.
c. In the Name list, select Purge Solvent.
d. Press the Parameters tab.
e. Select the check box for the appropriate pump.
f. Press Start.
2. As the pump is filling, observe the waste line.
If you observe solvent moving toward the check valve assembly, the waste-side check valve
is leaking.
3. If the waste-side check valve is leaking, replace it and repeat the Purge Solvent script.
❖ To determine if the solvent-side check valve is leaking
1. Start the Purge Solvent script.
2. As the pump is emptying, observe the solvent line.
If you observe solvent moving toward the solvent bottle from the check valve assembly,
the solvent-side check valve is leaking.
3. If the solvent-side check valve is leaking, replace it and repeat the Purge Solvent script.
Identifying a Leaking Check Valve
EASY-nLC 1200 Troubleshooting & Maintenance Guide
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Troubleshooting
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