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11041781.04 01/2020 EN/DE
Pressure gauge with reed contact model 851-A, for Ex areas
EN
7. Maintenance and cleaning
7.1 Maintenance
The instruments are maintenance-free.
The indicator and switching function should be checked once or
twice every year. For this the instrument must be disconnected
from the process to check with a pressure testing device.
Testing of filled instruments
For filled instruments, the level must be checked once or twice
every year.
The liquid level must not drop below 75 % of the instrument
diameter.
WARNING!
Danger to life due to impermissible filling/refilling
of the instrument with loss of explosion protection
The filling/refilling of instruments by non-authorised
personnel leads to a loss of the explosion protection
and can lead to damage to the instrument.
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Repair of the instruments may only be carried out
by authorised bodies.
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If a return is needed, please follow the instructions
given in chapter 8.2 “Return”.
Repairs must only be carried out by the manufacturer.
7. Maintenance and cleaning
