12
Reference Manual
00809-0100-4840, Rev CB
Section 3: Installation
February 2015
Installation
3.3.4 Mounting the transmitter above the liquid surface
A 2-in. thread is provided to mount the transmitter. The thread form is either 2-in. BSPT or NPT,
and is clearly marked on the hexagon of the transmitter body.
To help installation, flange accessories and bracket kits are available from Emerson Process
Management. The accessory flanges supplied are manufactured from PVC and are a full face
design. Care must be taken when installing to raised face mating flanges on the tank or vessel to
prevent distortion of the PVC flange by over-tightening the bolts. See “Spare parts and
accessories for the 3101/3102/3105” on page 90 for ordering information.
Note
The Rosemount 3101, 3102, and 3105 Transmitters are designed to be mounted in a
non-metallic fitting or flange. The use of metallic fittings/flanges is not recommended
Bracket mounting
The bracket kit contains a stainless steel angle bracket and PVC threaded disc, which may be
used to mount the transmitter on a support over the liquid surface.
The bracket and disc dimensions are in Figure A-5 on page 86. The combined weight of bracket
and disc is 16 oz (0,5 kg). For transmitter weight, see “Specifications” on page 77.
Installation instructions
1. Attach bracket to the disc using the three screws provided.
2. Attach the assembled bracket and disc to a rigid support over the liquid surface.
The bracket may be bolted to a suitable crossmember (structural section of steel).
Ensure the transmitter is perpendicular to the surface to maximize the return echo size.
3. Use PTFE tape on the screw thread of the transmitter (Figure 3-4 on page 13).
4. Insert the transmitter into the disc.
5. Tighten to a torque of 1.5 ft-lb (2 N-m) using the transmitter’s hexagon.
Do not use the transmitter housing to tighten.
Figure 3-3. Bracket Kit Mounting
A. Stainless Steel Bracket
B. No. 4X 13 Long Self Tap Screw (3 Positions) Carbon Steel (Zinc Plated)
C. PVC Disc
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