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7.1.1.

Depth probe with the internal PT temperature sensor.

Electrical connections and colours of the wires in the depth probe cable with an output signal

of 4...20 mA with resistance temperature sensors:

Depth probe:

− red: „+"

− black: „-"

− green: cable shield (if led out)

Resistance sensor (RTD):

− white

− brown

− white

− brown

7.2. Power supply

7.2.1. 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 2. Permissible power supply voltage.

Probe type

SGE-25, SGE-25/Hastelloy,

SGE-25S, SGE-25C

SGE-25, SGE-25S, SGE-25C

– Ex version

SGE-25, SGE-25S, SGE-25C

- TR version*

SGE-16

* TR version- made for measurements in fast-moving processes.

** TR Exi version

7.2.2. Resistance load in supply line

Power line resistance, power source resistance and additional series resistances increase

the voltage drops between the power source and the probe transducer. The maximum current under

normal operating conditions is 0.02 A. The maximum value of resistance in the supply circuit

(together with the supply line resistances) is given by the curves:

Revision 01.A.001/2021.09

Sensor in four-wire

connection

Sensor in three-wire

connection

Output signal

4...20 mA

0...10 V

4...20 mA

0...5 V

0...3,3 V

MIN. Supply

voltage

8 V DC

9 V DC

13 V DC

10,5 V DC

8 V DC

5 V DC

3,3 V DC

EN.IO.SGE

MAX Supply

voltage

39 V DC

28 V DC

30 V DC

36 V DC

28 V DC**

36 V DC