-Ex, non-contacting thermal switch unit
Possible Applications, BTS-Ex Characteristics
Installation and Operating Manual / Version 7 / 3626-019600ex
en / Protection class
0: public / 2020-07-15
The safety devices will be installed into/fixed to a master machine. Depending on the
ingress protection level (IP), the interval for cleaning the operational equipment (dust
deposits) has to be defined.
Switching element and initiator may be used as follows:
–
In Zone 2 (gas-Ex, Category 3G, EPL Gc) in Explosion Groups IIA and IIB
(initiator also IIC)
–
In Zone 22 (dust-Ex, Category 3D, EPL DC) in Explosion Groups IIIA, IIIB and IIIC
–
In Zone 1 (gas-Ex, Category 2 G, EPL Gb) in Explosion Groups IIA and IIB
(initiator also IIC)
–
In Zone 21 (dust-Ex, Category 2D, EPL Db) in Explosion Groups IIIA, IIIB and IIIC
-compliance
with the conditions for use, there is the risk of
explosion.
In case of explosive dust atmospheres of Explosion Group IIIC, the product
may be used with organic dusts only.
It is only allowed to install the evaluator beyond potentially explosive atmospheres in
housings that comply with the IP category of environmental requirements or in
housings with own approval.
Qualification with regard to surface temperature depends on the ambient conditions; it
applies to T4...T3: T4 means that for all gases, vapors, mists with an ignition
temperature of > 135 °C, the equipment is not an ignition source.
In explosive dust atmospheres, the reference temperature T***°C (from 85 °C to 190
°C) is relevant for the further considerations with regard to safety distance to the
smoldering temperature.
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