JUMO MAERA S29 SW, Руководство по установке, Страница: 54 / 118

14
4 Installation and mounting
4 Installation and mounting
DANGER!
The installation and the operation of the level probe must be carried out in accordance with this
operating manual and the applicable regulations and standards.
The supply and output of the level probe must lie in the zone which is not intrinsically safe.
The sensor circuit can be routed to zone 1 in accordance with device group II.
The resulting label is called:
II 2G Ex ib IIC T6..T4 Gb
II 2D Ex ib IIIC T70°C ... 100°C Db
For the maximum permissable temperatures see Technical data.
 "Environmental influences ", page 20
 When installing and operating the level probe, ensure that no electrostatic charging can take place.
The membrane of the level probe must not be damaged!
The pressure to be measured must not exceed the admissible overpressure of the level probe even
at pressure peaks.
DANGER!
The relevant regulations must be observed during electrical connection:
- Regulation for the installation of electrical plants in potentially explosive areas
- EC-type examination certificate
 The electrical connection must only be carried out by qualified personnel!
The voltage supply must be intrinsically safe and must not exceed the following maximum values:
U
i
: DC 28 V
I
i
: 100 mA
P
i
: 750 mW
Effective inner inductivity L: negligibly small
Effective inner capacity C: ≤ 10.4 nF
Depending on the cable length (L), the following values must be added to the inner capacity or inner
inductivity of the probe:
Effective inner capacity: 0.192 nF/m * L
Effective inner inductivity: 0.22 µH/m * L
In intrinsically safe electrical circuits, only intrinsically safe, certified measuring devices may be used!
Total capacity/inductivity in accordance of the cable length (L) for selected cable lengths (examples):
Cable length [m] Li [µH] Ci [nF]
2 0.44 10.784
5 1.1 11.360
10 2.2 12.320
20 4.4 14.240
50 11 20.000
100 22 29.600