Wika TR30 Manual do Utilizador descarregar pdf (Página 20)

14016442.01 06/2011 GB/D

20 WIKA operating instructions model TR30 per ATEX

9.6 Conditions to observe for connection in hazardous areas

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The electrical connection is made using the ⊕ and ⊖ terminals

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The power supply circuit must full the conditions for an intrisically-safe ignition

protection type

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The requirements of IEC 61241-0 must be met.

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For operation in dust hazardous areas, the demands of IEC 61241-14 must be followed.

Version with output signal 4 ... 20 mA, model TR30-W

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The following values for the power supply and current loop circuit must not be exceeded:

Power supply and current loop circuit (connections)

Voltage Ui DC 30 V

Current Ii 120 mA

Power Pi see Table 1

Eective internal capacitance Ci 6.2 nF

Eective internal inductance Li 110 µH

Sensor current loop

Power Po 37.5 mW

The maximum self-heating at the sensor tip is 4 K

Ambient temperature:

depending upon the temperature class, either Table 1a or 1b is applicable.

Table 1a, model TR30-W-A (for gases)

Temperature class Ignition source Power Pi Ambient temperature Tamb

T1 to T4 Gas 800 mW -20 °C ≤ Tamb ≤ 85 °C

T5 Gas 800 mW -20 °C ≤ Tamb ≤ 75 °C

T6 Gas 800 mW -20 °C ≤ Tamb ≤ 60 °C

For operation in areas which require Category 2D equipment, the following values are appli-

cable:

Table 1b, model TR30-W-B (for gases and dust)

Power Pi Ambient temperature Ta Max. surface temperature T

750 mW -20 ... +40 °C 60 °C

650 mW -20 ... +70 °C 90 °C

550 mW -20 ... +100 °C 120 °C

The max. temperature in °C at the sensor tip is calculated from the medium temperature

plus the self-heating in the event of failure (4 K).

9. Safety-related instructions for Ex operation

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