Waters Xevo TQD, Operator'S, Overview And Maintenance Manual

Page: 56 / 250

3-4 Changing the Mode of Operation
6. Using PEEK tubing equal to 0.004-inch ID, connect port S of the selector
valve to the ESI probe.
Recommendation:
To reduce peak broadening, use 0.004-inch ID tubing
for sample flow rates  1.2 mL/min; use 0.005-inch ID tubing for sample
flow rates

1.2 mL/min.
Requirements:
• If you are replacing the tubing between the selector valve and the
probe, minimize the length to reduce peak broadening.
• When cutting the tubing to length, cut it squarely (that is,
perpendicular to its horizontal axis).
Removing the ESI probe
Required material
Chemical-resistant, powder-free gloves
To remove the ESI probe:
1. Prepare the instrument for working on the source (see page 4-7 ).
2. Disconnect the tubing from the ESI probe.
3. Disconnect the ESI probe cable from the high-voltage connector.
4. Unscrew the probe locking ring.
Warning:
To avoid electric shock, do not use stainless steel tubing
or stainless steel finger-tight screws to connect the selector valve
to the ESI probe; use the PEEK tubing and natural (beige) colored
PEEK finger-tight screws supplied with the instrument.
Warning:
The LC system connections, ESI probe, and source can
be contaminated with biohazardous and/or toxic materials. Always
wear chemical-resistant, powder-free gloves while performing this
procedure.
Warning:
To avoid electric shock, ensure that the instrument is
prepared for working on the source before commencing this procedure.