August 2012
4
Quick Start Guide
General considerations
Handle the Rosemount 2120 with great care. Use both hands when carrying the
extended length versions.
Do not hold the 2120 using the forks
Do not alter the 2120 in any way
Figure 2. How to handle the Rosemount 2120
The 2120 is available as intrinsically safe or explosion-proof/flameproof versions
for hazardous area installations (see page 16 for approvals)
There are ordinary location versions of the 2120 for unclassified, safe areas
This liquid level switch is designed for open or closed tanks, and pipe installation. It
is weatherproof and protected against the ingress of dust, but must be protected
from flooding (Figure 3)
The 2120 operates in process temperatures of –40 to 302 °F (–40 to 150 °C)
Figure 3. Environmental considerations
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 electronics 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
OK OK
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