Use Of The Transponder In Hazardous Areas For Dusts - Siemens SIMATIC RF600 System Manual

Figure 7-28
7.10.3.6

Use of the transponder in hazardous areas for dusts

The equipment is suitable for dusts whose ignition temperatures for a dust layer of 5 mm are
higher than 210 °C (smoldering temperature). The ignition temperature specified here
according to IEC 60079-0: 2011 for ignition protection type ib in this case references the
smoldering temperature of a layer of combustible flyings (ib IIIA) or alternatively non-
conductive dusts (ib IIIB).
Temperature class grading for dusts
Ignitions of dust-air mixtures
When using the RF640T transponder, check that the temperature values are adhered to in
keeping with the requirements of the area of application.
Non-compliance with the permitted temperature ranges while using the transponder can
lead to ignitions of dust-air mixtures.
Temperature class assignment for dusts and a radiated power less than 100 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 cannot exceed the
value 100 mW, the temperature class assignment is as follows:
Ambient temperature range
-25 °C ≤ Ta ≤ +85 ℃
SIMATIC RF600
System Manual, 06/2019, J31069-D0171-U001-A22-7618
Maximum permitted ambient temperature depending on the radiated power
WARNING
7.10 SIMATIC RF640T
Temperature value
T96 °C
Transponder
427