Routine and Preventive Maintenance
The Electrospray and APCI Probes __________________________________________________________
Replacing the Capillary
Replace the capillary if it has become blocked or partially blocked during
operation. A significant increase in LC pump backpressure (that is, up to
300 psig at 1 mL/min added to the total LC system backpressure) or
instability in the signal could be symptoms of a partially blocked capillary.
APCI Probe Assembly
The starting point for this procedure is a disassembled APCI probe.
1.
2.
3.
Place the O-rings in position and insert the APCI probe mount.
Screw in the two M3 x 8 cap head stainless steel screws (P/N 5313020)
and tighten, using the 2.5 mm Allen key.
Insert the APCI capillary tube (P/N FM102594), graphite ferrule (P/N
6070119), and PEEK insert (P/N FM102591).
Caution.
Exercise care when handling the APCI probe capillary because it
is fragile and may be damaged easily.
4.
5.
6.
7.
Screw in the capillary retaining nut until finger-tight.
Use the setting fixture depth plate to align the end of the APCI probe
capillary and tighten the capillary retaining nut, using the 10 mm
spanner.
Place the locking plate and probe clamp in position.
Screw in the M3 x 10 cap head stainless steel screw (P/N FM103046)
and tighten, using the 2.5 mm Allen key.
5-10
__________________________ MSQ Hardware Manual ____________________________