Changing Ionization Modes
Switching from ESI to APCI ________________________________________________________________
Switching from ESI to APCI
The starting point for this procedure is the source setup for ESI operation,
with the LC and gas flows off, and the probe cooled.
WARNING.
Allow the source block and probe heater assembly to cool
before changing ionization modes.
1.
2.
3.
4.
5.
Unscrew and remove the PEEK finger-tight fitting from the ESI probe
assembly (P/N FM102595).
Turn the locking plate clockwise to the open position, and remove the
ESI probe assembly (P/N FM102595).
Locking plate
PEEK fitting
Figure 2-5. ESI probe assembly
Swap the ESI probe assembly (P/N FM102595) with the APCI probe
assembly (P/N FM102587), located in the holder in the door.
Turn the locking plate on the APCI probe assembly clockwise into the
open position, insert the APCI probe assembly (P/N FM102587), and
turn the locking plate counterclockwise into the closed position.
Change the APCI blank plug (P/N FM101437) with the APCI corona
pin (P/N FM101433), located in the holder in the source enclosure door.
2-2
___________________________ MSQ Hardware Manual ____________________________