Thermo Scientific EASY-nLC 1200 Troubleshooting And Maintenance Manual page 237

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8. To determine if flow sensor A is blocked, do the following:
a. Disconnect the solvent line from the flow sensor A inlet.
b. Depending on the backpressure for flow sensor A, do one of the following:
• If the pressure is <20 bar, flow sensor A is blocked. Replace it with a new flow
sensor as described in
• If the pressure is >20 bar, reconnect the line to flow sensor A, and go to
9. To determine if the line that connects valve A to flow sensor A is blocked, do the
following:
a. Disconnect the solvent line from port 6 of valve A.
b. Depending on the backpressure, do one of the following:
• If the pressure is <20 bar, the line from valve A to flow sensor A is blocked.
Replace it with a new solvent line.
• If the pressure is >20 bar, reconnect the line to valve A, and go to
10. To determine if valve A is blocked, do the following:
a. Disconnect the solvent line from port 1 of valve A.
b. Depending on the backpressure, do one of the following:
• If the pressure is <20 bar, valve A is blocked. Please contact product support.
• If the pressure is >20 bar, reconnect the line to valve A, and go to
11. To determine if the line from pressure sensor A to valve A is blocked or if
pressure sensor A is blocked, do the following:
a. Disconnect the solvent line from the outlet of pressure sensor A.
b. Depending on the backpressure, do one of the following:
• If the pressure is <20 bar, the line that connects pressure sensor A to valve A is
blocked. Replace it with a new solvent line.
• If the pressure is >20 bar, pressure sensor A is blocked. Replace it with a new
pressure sensor as described in
"Replacing a Flow Sensor"
"Replacing a Pressure Sensor"
EASY-nLC 1200 Troubleshooting & Maintenance Guide
7
Troubleshooting
Troubleshooting a System Blockage
on page 92.
step
step 10.
step 11.
on page 89.
9.
215