Aplisens SGE-16 Посібник користувача - Сторінка 12
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EN.IO.SGE
where:
U
- voltage at the terminals of the loop power supply 4...20 mA w [V].
sup
U
- minimum probe voltage
min
- maximum resistance of the supply line [Ω].
R
Lmax
7.2.3. Shielding
The cable shield (green wire) is led out from the probe's power supply and measurement cable.
The manufacturer recommends connecting the probe cable shield to the measuring system
grounding point. The earthing of the cable screen is especially justified in the environment of high
EMC disturbances. In a battery-assisted piezometric stand, the cable screen may or may not be
grounded.
7.3. Overvoltage protection
The probes may be exposed to switching or other overvoltage, for example due to lightning. Surge
diodes are used to protect against overvoltage between the wires of the transmission line. In order
to protect against overvoltage between the transmission line and the earth or the housing (against
which the diodes connected between the lines of the line are not protected), standard and Exi probes.
In the SA version, they are equipped with additional protection in the form of overvoltage limiters.
Additionally, an external protective device can be used, e.g. the UZ-2 system by APLISENS S.A.
7.4. Final Inspection of cabling
After completing the electrical installation of the probe it is necessary to check the following:
−
is the probe connected according to the information given in section
−
when using a junction box, that the glands are tightened;
−
are the diaphragm covers (SGE-25C and SGE-25S) removed.
12
➔ Table 2.
➔ 7.1;
Revision 01.A.001/2021.09