JUMO MAERA S29 SW, Руководство по установке, Страница: 56 / 118

4 Installation and mounting
16
CAUTION!
The electrical connection must only be carried out by qualified personnel.
CAUTION!
For setup/operation, the regulations according to the German Hazardous Substances Ordinance
and the German Ordinance of Industrial Safety and Health
(for the relevant device version), as well as this operating manual, are binding.
The maximum admissible ambient temperature of 50 °C must always be observed for the level
probe.
CAUTION!
Install the device in a currentless condition.
CAUTION!
The membrane at the process connection of the level probe must not be damaged.
Otherwise it may result in incorrect measurements or even media leaking.
 Do not allow the membrane to come into contact with sharp or hard objects.
NOTE!
Cable assembly
The special cable for the level probe must be fitted such that the pressure compensation in the cable
assembly is not crushed.
The cable end must terminate in a dry room or in a suitable terminal case so that no moisture can pen-
etrate.
A terminal case with a pressure compensation element is recommended for use.
The terminal case should be mounted as close as possible to the surface of the medium while still out-
side the medium.
In addition, the cable should not be routed through damp conditions.
For variations in media, a guide tube should be used that prevents measuring errors in flow caused by
sideways movement and by the level probe hitting the walls of the container.
NOTE!
The level probe must be grounded. To prevent electrolysis, the shielding of the level probe should be set
to the same potential as the other devices found in the medium (pumps, agitators etc.).
NOTE!
Level probes in free-field applications without integrated overvoltage protection must be protected
against electrical discharge.
In addition, it is recommended that external overvoltage protection is used upstream and downstream of
the display or processing unit.