39
Reference Manual
00809-0100-4108, Rev CA
Hardware Installation
March 2017
Hardware Installation
3.5.2 Weld spud
1. Using the appropriate size hole saw, cut a hole in the process vessel to accept the weld
spud. The diameter for a weld spud with heat isolator groove is 2.37-in. (60 mm); when
compatible with 1-in. PMC
®
process connection style spud, diameter is 1.32 in. (33,4
mm). The hole should produce a tight, uniform fit when coupled with the weld spud.
2. Bevel the edge of the vessel hole to accept filler material.
3. Remove the weld spud from the transmitter and remove the PTFE gasket from the weld
spud.
4. Position the weld spud in the vessel hole, place heat sink and tack spud in place using the
welding sequence shown in Figure 2-8. Cool each section with a wet cloth before
proceeding to the next section.
5. Weld the spud in place using 0.030 to 0.045-in. (0,762 to 1,143 mm) stainless steel rod
as filler in the bevelled area. Using between 100 and 125 amps., adjust the amperage for
0.080-in. (2,032 mm) penetration.
3.5.3 Transmitter
1. After the weld spud has cooled, remove the heat sink and install the PTFE gasket into the
weld spud. Ensure that the gasket is properly positioned within the weld spud; improper
placement could cause a process leak.
2. Position the transmitter into the spud and begin to engage the threads. Rotate the
transmitter prior to seating the threads completely to enable access to the housing
compartments, the conduit entry, and the LCD display.
3. Hand tighten the transmitter using the knurled retaining ring, then snug an additional
1
/8
turn with adjustable pliers.
Important
Do not over-tighten the retaining ring. A spanner wrench hole is located on the knurled
portion of the retaining ring to assist in transmitter removal if it is over-tightened.
Excessive heat will distort the weld spud. Weld in sections, as shown in Figure 2-5,
cooling each section with a wet cloth. Allow adequate cooling between passes.
To reduce the chances of distorting the weld spud (for 1.5-in. connection), use a he
sink—Rosemount Part Number 02088-0196-0005.
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