WIKA TR30 - Handbuch (Seite 20)

14016442.01 06/2011 GB/D
20 WIKA operating instructions model TR30 per ATEX
GB
9.6 Conditions to observe for connection in hazardous areas
■ The electrical connection is made using the ⊕ and ⊖ terminals
■ The power supply circuit must fulfil the conditions for an intrisically-safe ignition
protection type
■ The requirements of IEC 61241-0 must be met.
■ 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
■ 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
Effective internal capacitance Ci 6.2 nF
Effective 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