Emerson Rosemount 5408 Reference Manual page 56

Mechanical Installation
2.
3.
4.
5.
46
Mount the O-ring.
Mount the antenna adapter on flange/manhole cover. Ensure the antenna adapter
fits tightly to the flange/manhole cover.
> 0.59 in. (15 mm)
Remove the M20 adapter and visually inspect the O-rings for damage and dirt.
D
A
Carefully insert the antenna.
Ø 3.98 ± 0.02 in.
(Ø 101 ± 0.6 mm)
OR
G 3½"
Max. 1.18 in. (30 mm)
O-rings
Reference Manual