7. Optional: If a bottom centering disc is ordered, then drill two holes on the bottom
segment using the drilling fixture.
Table 3-10: Determination of Probe Segments for Standard Seal
Desired probe length (L)
Number of
middle
segments (n)
Length of bottom segment
(Y)
in.
mm
in.
mm
15.8 ≤ L ≤ 47.2
400 ≤ L ≤ 1200
0 pc
Y = L -15.8
Y = L - 400
47.2 < L ≤ 78.7
1200 < L ≤ 2000
1 pc
Y = L - 47.2
Y = L - 1200
78.7 < L ≤ 110.2
2000 < L ≤ 2800
2 pcs
Y = L - 78.7
Y = L - 2000
110.2 < L ≤ 141.7
2800 < L ≤ 3600
3 pcs
Y = L - 110.2
Y = L - 2800
141.7 < L ≤ 173.2
3600 < L ≤ 4400
4 pcs
Y = L - 141.7
Y = L - 3600
173.2 < L ≤ 204.7
4400 < L ≤ 5200
5 pcs
Y = L - 173.2
Y = L - 4400
204.7 < L ≤ 236.2
5200 < L ≤ 6000
6 pcs
Y = L - 204.7
Y = L - 5200
236.2 < L ≤ 267.7
6000 < L ≤ 6800
7 pcs
Y = L - 236.2
Y = L - 6000
267.7 < L ≤ 299.2
6800 < L ≤ 7600
8 pcs
Y = L - 267.7
Y = L - 6800
299.2 < L ≤ 330.7
7600 < L ≤ 8400
9 pcs
Y = L - 299.2
Y = L - 7600
330.7 < L ≤ 362.2
8400 < L ≤ 9200
10 pcs
Y = L - 330.7
Y = L - 8400
362.2 < L ≤ 393.7
9200 < L ≤ 10000 11 pcs
Y = L - 362.2
Y = L - 9200
3.8
Ground the device
The Rosemount 3308 Series Wireless Guided Wave Radar transmitter operates with the
housing grounded or floating. Floating systems can cause extra noise that may affect
many types of readout devices. If the signal appears noisy or erratic, grounding at a single
point may solve the problem.
Grounding of the electronics enclosure should be done in accordance with local and
national installation codes. Grounding is accomplished by using the external case
grounding terminal.
Non-metallic tanks
Ground device on non-metallic tanks (e.g. fiberglass tanks) to prevent electrostatic charge
build-up.
Reference Manual
Installation
00809-0100-4308
February 2020
Reference Manual
69
Summary of Contents for Rosemount 3308A
Page 8: ...Contents Reference Manual February 2020 00809 0100 4308 viii Rosemount 3308 Series ...
Page 10: ...Introduction Reference Manual February 2020 00809 0100 4308 10 Rosemount 3308 Series ...
Page 22: ...Transmitter overview Reference Manual February 2020 00809 0100 4308 22 Rosemount 3308 Series ...
Page 74: ...Installation Reference Manual February 2020 00809 0100 4308 74 Rosemount 3308 Series ...
Page 96: ...Configuration Reference Manual February 2020 00809 0100 4308 96 Rosemount 3308 Series ...