Figure 52. Sample Tubing Connection To The Apci Flange Fitting; Figure 53. Sample Tube Extending Past The Apci Nozzle Tip - Thermo Scientific LTQ Series Hardware Manual

Installing the New APCI Sample Tube
Thermo Scientific
For Field Service use only
O-ring, Viton, 0.239 in. ID, 1/16 in. thick
 To install a new APCI sample tube
1. Remove the APCI sample tube from the APCI nozzle (see
2. Check the condition of the O-ring on the APCI flange fitting
if necessary.
3. Using the fused-silica cutting tool, cut approximately 13 cm (5 in.) of fused-silica tubing,
and then under magnification check that the end is cut squarely.
4. Connect the sample tubing to the APCI flange fitting as follows:
a. Slide the nut and then the ferrule onto the sample tubing

Figure 52. Sample tubing connection to the APCI flange fitting

Sample tubing
Ferrule
b. While pressing the sample tubing into the externally threaded end of the APCI flange
fitting, finger tighten the nut and fitting.
5. Carefully insert the free end of the sample tubing into the back of the APCI nozzle and
out the nozzle tip, and then finger tighten the APCI flange fitting.
6. Using the 3/8 in. open-end wrench, tighten the APCI flange fitting an additional quarter
turn (Figure 50 on page
7. Using the fused-silica cutting tool, cut the sample tube approximately 1 mm past the tip
of the APCI nozzle (Figure

Figure 53. Sample tube extending past the APCI nozzle tip

1 mm
Male nut
76).
53).
APCI nozzle tip
5
Ion Source Probe Maintenance
Part number
00107-04000
page 76).
(Figure 52), and replace it
(Figure 52).
APCI flange fitting
0.239 in. ID O-ring
APCI flange fitting
LTQ Series Hardware Manual
Maintenance
77