Siemens SIMATIC RF640A, Системное руководство

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Transponder
7.14 SIMATIC RF680T
SIMATIC RF600
System Manual, 11/2018, J31069-D0171-U001-A21-7618
435
Temperature class assignment for dusts and a radiated power of 10 mW ERP to 2000 mW ERP
If the radiated power of an antenna radiating into the hazardous area or located in the
hazardous area and operating in the 865 - 868 MHz frequency band can be between the
values 10 mW ERP and 2000 mW ERP, the temperature class assignment is as follows:
Ambient temperature range Temperature value
-25 °C ≤ Ta ≤ T
max. ambient
°C
1)
135°C
2)
1)
See diagram, orange line
2)
See diagram, blue line
WARNING
Ignitions of dust-air mixtures
Using the RF680T transponder with radiant power greater than 1280 mW ERP, requires
compliance with the reduced maximum ambient temperature (see diagram) for maintaining
the temperature value to a maximum of 135 °C. Non-compliance with the permitted
temperature ranges while using the transponder can lead to ignitions of dust-air mixtures.
The respective temperature value and the maximum allowed ambient temperature in relation
to the radiated power of the antenna is shown in the diagram below:
Temperature value
Ambient temperature
Figure 7-40 Temperature value and maximum permitted ambient temperature in relation to the
radiated power