Troubleshooting guide

118
Reference Manual
00809-0100-4308, Rev BA
Appendix A: Reference Data
December 2014
Reference Data
Centering discs
To prevent the probe from contacting the chamber or pipe wall, centering discs are available for
rigid single, flexible single, and flexible twin lead probes. The disc is attached to the end of the
probe. Discs are made of stainless steel or PTFE. See Table A-7 on page 118 for Dimension D.
Table A-8 on page 118 shows which centering disc diameter to choose for a particular pipe.
Figure A-12. Dimension D for Centering Discs
Table A-7. Centering Discs Dimensions
Table A-8. Centering Disc Size Recommendation for Different Pipe Schedules
Disc size Actual disc diameter
(Dimension D)
2 in. 1.8 in. (45 mm)
3 in. 2.7 in. (68 mm)
4 in. 3.6 in. (92 mm)
6 in. 5.55 in. (141 mm)
8 in. 7.40 in. (188 mm)
Pipe size Pipe schedule
5s, 5 & 10s,10 40s, 40 & 80s, 80 120 160
2 in. 2 in. 2 in. N/A
(1)
(1) Schedule is not available for pipe size.
N/A
(2)
(2) No centering disc is available.
3 in. 3 in. 3 in. N/A
(1)
2 in.
4 in. 4 in. 4 in. 4 in. 3 in.
5 in. 4 in. 4 in. 4 in. 4 in.
6 in. 6 in. 6 in. 4 in. 4 in.
7 in. N/A
(1)
6 in. N/A
(1)
N/A
(1)
8 in. 8 in. 8 in. 6 in. 6 in.
D