CiDRA Elevated Temperature Sensor Head - Manual (Page 17)

Repeat this installation procedure on the opposite end of the cover.
Install the cover end seal compression rings so that they overlap the
cover flange seam. The double pair of bolt holes in the end seal
compression rings will align with the corresponding double threaded
holes in the cover halves.
NOTE: If the end seal compression rings do not have a double pair o
bolt holes as shown, align the end seam of the compression rings
between the two closely spaced tapped holes on the end of the cover.
Note overlap of
compression ring with
respect to cover flange
Cover flange seam
Figure 14 Cover End Seal Compression Ring
Install 5/16-18 bolts fitted with a washer and lock washer in each
cover end seal compression ring bolt hole. Tighten the bolts gradually
so that the rings pull in gradually and evenly with respect to the cover.
The final gap between the compression ring and the cover should be
less than 1/8 inch around the circumference. Note: It might be
necessary to start the seal ring bolts without the washers due to the
length of the bolts. Once the seal has compressed, remove the bolts
and install the flat and lock washer.
21020-01 Rev 01 Page 2-13