17
11041781.04 01/2020 EN/DE
Pressure gauge with reed contact model 851-A, for Ex areas
EN
WARNING!
Physical injuries and damage to property and the
environment caused by media escaping under
high pressure
With the pressurisation of the instrument, as a result of
poor sealing of the process connection, media under
high pressure can escape.
Due to the high energy of the media that can escape in
the event of a failure, the possibility of physical injuries
and damage to property exists.
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The sealing of the process connection must be
carried out expertly and checked for leak tightness.
5.1 Mechanical connection
In accordance with the general technical regulations for pressure
gauges (e.g. EN 837-2 “Selection and installation recommenda-
tions for pressure gauges”).
Instruments must be grounded via the process connection. This is
why electrically conductive sealing should be used at the process
connection. Alternatively, take other measures for grounding.
Measures for grounding applied ex works (e.g. welding spots or
fuse plates) must therefore be used to integrate the instruments
into the equipotential bonding system and must not be removed
under any circumstances. Ensure that the measures for grounding
are reinstalled after dismounting (e.g. replacing the instrument).
5. Commissioning, operation
