Thermo Scientific EASY-nLC 1200 Troubleshooting And Maintenance Manual page 34

1
Introduction
Hardware Components
12 EASY-nLC 1200 Troubleshooting & Maintenance Guide
.
Table 1. Valve functions
Valve Function
Valves A and B Direct the solvent flow from syringe pump A and B, respectively.
1–2 position
1–6 position
Centered
Valve S Directs the solvent flow from syringe pump S and the solvent flow from
the mixing Tee.
1–2 position
1–6 position
Centered
Valve W Directs the solvent flow through the venting Tee to the waste beaker or
provides pressure venting to the system.
1–2 position
1–6 position
Centered
The EASY-nLC is designed as a front end system for mass spectrometers. In this
configuration, electrical currents leakages, originating from the MS high voltage, can flow
towards the EASY-nLC
Directs the solvent flow toward the check valve. When
the valve is in the 1–2 position, the pump draws solvent
from the solvent bottle on top of the instrument or
empties solvent to the waste beaker.
Directs the solvent flow toward the mixing Tee.
• Prevents backflow into the solvent line upstream of
the mixing Tee.
• Allows the backpressure for the solvent A and B lines
to equalize before the gradient step of a sample run.
• Enables pump B to pre-pressurise in the Prepare
gradient step.
• Provides backpressure for several maintenance scripts.
The solvent flow bypasses the sample loop.
The solvent flow passes through the sample loop.
• Provides backpressure for the Flush Air script for
pump S.
• Provides backpressure for the system leak test.
• Shuts off the flow to the Column Out line and
provides backpressure during the Flow Sensor
Calibration script.
Provides backpressure to direct flow towards the analytical
column (blind nut in port 2).
Directs the solvent flow from the venting Tee to the waste
beaker.
Blocks the solvent flow through the valve to the waste
beaker.
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