Physical Installation; Installation Recommendations - Emerson 2120 Quick Start Manual

December 2016
Ensure there is adequate space outside the tank or pipe. A clearance of 1.2 in.

(30 mm) is required for the cover to be removed.
Always ensure a proper seal by installing the metal housing cover so that metal

contacts metal, or plastic contacts plastic. Use Rosemount O-rings.
Always ground the housing in accordance with national and local electrical

codes. The most effective grounding method is a direct connection to earth
(ground) with minimal impedance. Use the fork earth for metal housings with
NPT conduit entries.

2.2 Installation recommendations

Avoid installing near liquid entering the tank at the fill point.

Avoid heavy splashing on the forks.

Increasing the time delay reduces accidental switching.
Avoid installing near heat sources.

Ensure the fork does not come into contact with a tank/pipe wall or fittings.

There must be no risk of 'bridging' the forks

Figure 4. Avoid Product Build-up
OK

3.0 Physical installation

1. Install the level switch according to standard installation practices, making
sure to correctly align the fork using the alignment notch or groove
2. Use supports for extended fork lengths greater than 3.2 ft. (1 m).
Refer to the Rosemount 2120
3. Close the housing cover and tighten to safety specification. Always ensure a
proper seal so that metal touches metal or plastic touches plastic, but do not
over tighten.
4. Insulate the level switch with ROCKWOOL
around the housing.
(Figure
Reference Manual
®
.
Allow 3.9 in. (100 mm) of clearance all
Quick Start Guide
4).
for guidance.
(Figure 5).
5