Wika TR30 Instrukcja Użytkownika Pobierz pdf (Strona 21)

14016442.01 06/2011 GB/D

WIKA operating instructions model TR30 per ATEX 21

Example for model TR30-W-A

Resistance thermometer, diameter: 6 mm

amb

= 40 °C

supplied power = 37.5 mW (see P

from transmitter)

Temperature class for T3, Instrument Category 1

Additional information

Temperature class for T3 = 200 °C

Safety factor for type-tested instruments (for T6 to T3)

= 5 K

Safety factor for applications of Instrument Category 1 (Zone 0)

= 80 %

1) EN 50014: 1997 Section 23.4.6.1

2) EN 1127-1: 1997 Section 6.4.2

To determine: max. permissible temperature in °C at the sensor tip T

Self-heating [in K] = 4 K

= (temperature class for T3 - safety factor for type-tested instruments) x safety factor for

applications with instrument category 1 - self-heating [in K]

= (200 °C – 5 K) x 0.8 – 4 K

= 152 °C

The permissible temperature in °C at the sensor tip (T

max

) = 152 °C

9. Safety-related instructions for Ex operation

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Wika TR30 Instrukcja Użytkownika Strona 21