Checking Valve S For Leaks; Checking The Sample Loop Connections For Leaks; Locating Leaks In The Solvent Path From Valve B To Flow Sensor B - Thermo Scientific EASY-nLC 1200 Troubleshooting And Maintenance Manual

7
Troubleshooting
Troubleshooting the Results of the System Leak Test

Checking Valve S for Leaks

Checking the Sample Loop Connections for Leaks

Locating Leaks in the Solvent Path from Valve B to Flow Sensor B

184 EASY-nLC 1200 Troubleshooting & Maintenance Guide
The system leak test returned the following message (see
Check valve S for leaks. (Flow sensor A >100 nL/min)
The most likely cause of this test result is a leak in the flow path between ports 3 and 4 of
valve S.
Please contact product support for a valve replacement.
The system leak test returned the following message (see
Check the sample loop for leaks.
The connections in the sample loop are leaking, or there is a leak in valve S itself.
❖ To fix the leaking sample loop connections or the leaking valve
1. Return the instrument to atmospheric pressure as described in the
Fittings Quick Reference Guide"
reconnect the nanoViper fittings connected to ports 2 and 5 on valve S. Take care not to
overtighten these fingertight fittings.
2. Rerun the system leak test (see
3. If the script still fails, replace the sample loop (see
page 88).
4. If the problem persist, the leakage is more than likely in valve S itself. Please contact
product support.
The system leak test returned the following message (see
Check the B solvent line (valve B to flow sensor B) and valve B for leaks.
Flow sensor B has detected solvent flow toward valve B. This negative flow rate is caused by a
leak in valve B, or in the connections to port 6 of valve B and the flow sensor inlet.
Note When the system is leak tight and valve B is in the Center position, the solvent
flow through flow sensor B from pump A should be negligible. A negative flow rate of
up to –30 nL/min is within the normal range. A higher negative flow rate indicates a leak
that could affect the retention time of analytes.
Figure 147 shows a reading for flow sensor B of –60 nL/min. This means there is a leak in the
solvent path from valve B to flow sensor B.
Table 26
Table
on page 273. Then individually disconnect and
"Running a System Leak Test"
"Replacing the Sample Loop"
Table 26
on page 183):
26):
"Using nanoViper
on page 178).
on
on page 183):
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