December 2016
26
Quick Start Guide
9. Special conditions of use
a. If the enclosure is made of an alloy or plastic material, the following
precautions must be observed:
(i) The metallic alloy used for the enclosure material may be at the
accessible surface of this equipment; in the event of rare accidents, ignition
sources due to impact and friction sparks could occur. This shall be
considered when the Rosemount 2120 is being installed in locations that
specifically require Equipment Protection Level Ga or Da [ATEX: group II,
category 1G equipment] [
IECEx: in Zone 0 and 20 locations].
(ii) Under certain extreme circumstances, the non-metallic parts
incorporated in the enclosure of the Rosemount 2120 may generate an
ignition-capable level of electrostatic charge. Therefore, when they are
used for applications that specifically require Equipment Protection Level
Ga or Da [ATEX: group II, category 1G equipment] [IECEx: in Zone 0 and 20
locations], the Rosemount 2120 shall not be installed in a location where
the external conditions are conducive to the build-up of electrostatic
charge on such surfaces. Additionally, the Rosemount 2120 shall only be
cleaned with a damp cloth.
b. Ensure the ambient air temperature (Ta) and the process temperature (Tp)
are within the range detailed above for the T class of the specific explosive
gases or vapors present.
c. Ensure the ambient air temperature (Ta) and the process temperature (Tp)
are within the range detailed above for the maximum surface temperature
of the specific explosive dusts present.
10.15 Instructions for hygienic installations
The following instructions are for a Rosemount 2120 Level Switch (“level switch”)
with 38 mm or 51 mm Tri Clamp fitting covered by 3-A authorization 3496 and
EHEDG certificate 102016, and ASME-BPE and FDA compliance:
1. The level switch is suitable for installation on pipeline (with fork gap in line
with the flow) and on closed vessels (with the fork gap vertical).
EHEDG only recommend horizontal stub mounting in pipelines:
2. Installation of the level switch shall be carried out by suitably trained
personnel, in accordance with the applicable standards and code of practice.
O
To Next Page
Loading...
