Emerson 2120 - Page 23

Quick Start Guide
23
December 2016
9. It is the responsibility of the user to ensure:
a. The voltage and current limits for this equipment are not exceeded.
b. That the joint requirements between the probe and the vessel tank are
compatible with the process media.
c. That the joint tightness is correct for the joint material used.
d. That only suitably certified cable entry devices will be utilized when
connecting this equipment.
e. That any unused cable entries are sealed with suitably certified stopping
plugs.
10. The probe fork is subjected to small vibration stresses as part of its normal
function. As this provides a partition wall, it is recommended that the fork
should be inspected every 2 years for signs of defects.
11. Technical data:
a. Coding:
ATEX: II 1/2 G D, Ex db IIC T6...T2 Ga/Gb, Ex tb IIIC T85°C...T 265°C Db
IECEx: Ex db IIC T6...T2 Ga/Gb, Ex tb IIIC T85°C...T 265°C Db
b. Temperature:
2120*****E1X**, 2120*****E1S**; 2120*****E7X**, 2120*****E7S**:
Minimum ambient air temperature (Ta) = –40°C
Minimum process temperature (Tp) = –40°C
c. Pressure: Must not exceed the rating of the coupling/flange fitted.
d. For electrical details and pressure ratings, see the Rosemount 2120
Product Data Sheet
or Reference Manual.
e. Year of manufacture: marked on the product label
12. Cable selection
a. It is the responsibility of the user to ensure that suitably temperature rated
cable is used. Note that the cable entry temperature may exceed 70 °C.
The table below is a guide to selection:
Temperature
classes
Maximum surface
temperature (T)
Maximum
ambient air
temperature (Ta)
Maximum process
temperature (Tp)
T6, T5, T4, T3, T2, T1 T85 °C 75 °C 75 °C
T5, T4, T3, T2, T1 T100 °C 70 °C 90 °C
T4, T3, T2, T1 T135 °C 65 °C 125 °C
T3, T2, T1 T160 °C 50 °C 150 °C
T class Cable temperature rating
T6 Above 85 °C
T5 Above 100 °C
T4 Above 135 °C
T3 Above 160 °C