Wika TR30 Manual do Utilizador descarregar pdf (Página 22)

14016442.01 06/2011 GB/D

22 WIKA operating instructions model TR30 per ATEX

Version with output signal Pt100, model TR30-P

■

Sensor current loop

Voltage Ui DC 30 V

Current Ii 550 mA

Power Pi see table 2

Eective internal capacitance negligibly small

Eective internal inductance negligibly small

Ambient temperature: depending on the temperature class, either table 2 (for gas

ignition source) or table 3 (for dust ignition source) applies.

Table 2, model TR30-P-A (for gas)

Temperature

class

Power Pi Max. permissible temperature

at the sensor tip

Ambient temperature T

amb

T1 1500 mW 450 °C -20 °C ≤ T

amb

≤ 80 °C

T2 1500 mW 300 °C -20 °C ≤ T

amb

≤ 80 °C

T3 500 mW 200 °C -20 °C ≤ T

amb

≤ 80 °C

T4 250 mW 135 °C -20 °C ≤ T

amb

≤ 80 °C

T5 50 mW 100 °C -20 °C ≤ T

amb

≤ 75 °C

T6 50 mW 85 °C -20 °C ≤ T

amb

≤ 60 °C

When using a duplex measuring resistor (or two single measuring resistors), and operating

them simultaneously, the sum of the individual power values must not exceed the value of

the max. permissible power specied in table 2 or table 3.

Table 3, model TR30-P-B (for gas and dust)

Power Pi Ambient temperature T

Max. surface temperature T

750 mW -20 ... +40 °C T

max. + self-heating

650 mW -20 ... +70 °C T

max. + self-heating

550 mW -20 ... +100 °C T

max. + self-heating

The supplied power, Pi, is only realised at the sensor tip. The self-heating can, depending

on the design, be calculated with the following table:

Table 4

Installation type Thermal resistance Rth

For thermowell Ø 3 mm For thermowell Ø 6 mm

Without additional thermowell 110 K/W 75 K/W

Installed in a blind bore

(minimum wall thickness 5 mm)

22 K/W 16 K/W

Specic conditions for safe use: none

9. Safety-related instructions for Ex operation

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 59 60

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