PROline Promass 80 6 Commissioning
Endress+Hauser 57
6.2.7 Purge and pressure monitoring connections
The sensor housing protects the inner electronics and mechanics and is filled with dry
nitrogen. Beyond that, up to a specified measuring pressure it additionally serves as
secondary containment except of the Promass E.
#
Warning:
For a process pressure above the specified containment pressure, the housing does not
serve as an additional secondary containment. In case a danger of measuring tube
failure exists due to process characteristics, e.g. with corrosive process fluids, we
recommend the use of sensors whose housing is equipped with special pressure
monitoring connections (ordering option). With the help of these connections, fluid
collected in the housing in the event of tube failure can be drained off. This diminishes
the danger of mechanical overload of the housing, which could lead to a housing failure
and accordingly is connected with an increased danger potential. These connections
can also be used for gas purging (gas detection).
The following instructions apply to handling sensors with purge or pressure monitoring
connections:
• Do not open the purge connections unless the containment can be filled immediately
with a dry inert gas.
• Use only low gauge pressure to purge. Maximum pressure 5 bar.
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