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12 Electrical installation
The nominal value for the supply voltage for the electrical installation is 24 V DC.
Supply of the METPOINT
supply that is protected against overvoltage. The energy supply must come from a source with an energy-
limited electrical circuit (10 A max./ 30 V max.) and a protective separation from the network. See also EN
61010-1, Clause 9.4.
Prior to the installation and start-up, the maximum load resistance must be observed. With a nominal value
of the supply voltage of 24 V DC, the max. load resistance is 571 Ω. With a supply voltage that deviates from
24 V DC, the max. load resistance can be calculated according to the following formula:
Warning!
Risk of injury in the event of insufficient qualifications!
Improper
use
All of the activities described in these operating instructions must only be carried out by
qualified personnel with the qualifications described hereinafter.
Qualified personnel
Due to the specific training and knowledge concerning the measuring and control technology, and due to
their experience and knowledge of the country-specific provisions, standards in force, and directives, quali-
fied personnel are capable of carrying out the described work and of independently identifying the possible
risks.
Special employment conditions require further corresponding knowledge, e.g. regarding aggressive media.
®
METPOINT
SP11
®
PRM SP11 must be implemented with a stabilised, short-circuit-protected power
R
≤ (U
- 12 V) / 0.021 A [Ω]
L
v
can
lead
to
significant
personal
injury
and
Electrical installation
material
damage.
17
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