Thermo Scientific EASY-nLC 1200 Troubleshooting And Maintenance Manual page 235

Thermo Scientific
❖ To locate the source of the blockage when the Test Solvent A test fails
1. To determine if valve W is blocked, do the following:
a. Make sure that the Precolumn Equilibration script is set up and running as described
in step 1 on page 210
with a union.
b. Disconnect the Waste In line from port 2 of valve W (see
c. Depending on the backpressure, do one of the following:
• If the pressure is below the threshold, valve W is blocked. Please contact the
product support.
• If the pressure is above the threshold reconnect the Waste In line, go to
2. To determine if the Waste In line is blocked, do the following:
a. Disconnect the Column Out line and the Waste In line from the union.
Column Out line
b. Depending on the backpressure, do one of the following:
• If the pressure is below the threshold of 125 bar, the Waste In line is blocked.
Discontinue this troubleshooting procedure and replace the Waste In line with a
new line.
• If the pressure is above the threshold of 125 bar, go to
3. To determine if the Column Out line is blocked, do the following:
a. Disconnect the Column Out line from port 3 of valve S.
b. Depending on the backpressure, do one of the following:
• If pressure is below the threshold of 90 bar, the Column Out line is blocked.
Discontinue this troubleshooting procedure and replace the Column Out line
with a new line.
• If the pressure is above the threshold of 90 bar, reconnect the Column Out line,
and go to step
and that the Column Out and Waste In lines are connected
Union
4.
EASY-nLC 1200 Troubleshooting & Maintenance Guide
7
Troubleshooting
Troubleshooting a System Blockage
Figure 162 on
Waste In line
step 3.
page 211).
step 2.
213