Aplisens SGE-25.SMART Manuale d'uso - Pagina 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

− brown

− white

− 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:

- voltage on terminals of current loop power supply 4...20 mA in [V].

zas

– minimum power supply voltage of probe

min

– maximum supply line resistance w [Ω].

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.