Aplisens SGE-25.SMART Manual del usuario - Página 13
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7.1.1. Level probe with internal temperature sensor PT
Electrical connections and wire colours in the level probe cable with 4...20 mA output signal with
resistance temperature sensors:
Level probe:
− red: „+" power supply;
− black: „–„ power supply;
− green: wire shield (if it led out);
Resistance sensor:
− white
− white
− brown
− brown
− white
− brown
− brown
7.2. Power supply voltage
Supply cables may be live.
There is a risk of electric shock and/or explosion.
Installation in potentially explosive atmospheres must comply with local standards and
regulations.
Table 3. Permissible power supply voltage.
Probe type
SGE-25.Smart,
SGE-25S.Smart,
SGE-25C.Smart,
SGE-25S.Smart/Titan
*For probes in intrinsically safe version Exi (not applicable SGE-25S.Smart/Titan).
7.2.1. Resistive load in the supply line
Power line resistance, power source resistance and additional series resistances increase the voltage
drops between the power source and the probe. The maximum current of the device in normal operation
is 20,500 mA, but in high alarm condition the current I_max is 22,000 mA.
The maximum value of resistance in the supply circuit (together with the resistances of the supply wires)
is given by the formula:
Where:
U
- voltage on terminals of current loop power supply 4...20 mA in [V].
zas
– minimum power supply voltage of probe
U
min
– maximum supply line resistance w [Ω].
R
L_MAX
Installation in hazardous areas must comply with local standards and regulations.
Revision 01.A.001/2021.09
Sensor in four wire connection;
Sensor in three wire connection;
Output
Minimum power
signal
supply voltage
4...20 mA
(➔
Table 3. Permissible power supply
EN.IO.SGE.25.SMART
7,5 V DC
Maximum power
supply voltage
55 V DC
30 V DC*
)
voltage.
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