Kobold DON-05Bx, Руководство по эксплуатации, Страница: 47 / 55

DON
DON K18/0418 page 47
17. Manufacturers declaration –
Switches for use in Explosive Atmospheres
Background
a) Simple apparatus such as Mechanical contact switches, Reed switches, Thermocouples,
Resistive sensors & LED’s may be employed in a hazardous area without certification provided that the
device does not generate or store more than 1.2 V, 0.1 A, 20 µJ and 25 mW. This IEC definition is also
now used in the USA & Canada.
b) The surface temperature of simple apparatus under normal or fault conditions must not exceed
the ignition temperature of the gas, subject to the following very valuable exception.
c) Because the ability of hot surfaces to cause ignition depends on their size, simple apparatus
having a surface area between 20 mm² and 100 mm² will be classified T4 when the matched output
power of the interface device does not exceed:
1.3W into 40 ºC ambient
1.2W into 60 ºC ambient
1.0W into 80 ºC ambient
The 1.3 W / 40 ºC element of this European dispensation is now accepted in the USA and Canada. Switches
(mechanical & reed switches) and junction boxes dissipate no power and are normally classifies T6 (85 ºC).
Declaration
We, Kobold Messring GmbH, hereby declare that the reed contacts installed in the H0 and R0 DON
electronics options come within the scope of "Simple Apparatus" pursuant to European, American and
Canadian guidelines, although no special labelling is included to this effect.
Hofheim, 26. March 2015
H. Peters M. Wenzel
General Manager Proxy Holder
Reed switch Resistive sensors Thermocouples LED
These simple apparatus can be installed freely in I.S. circuits, no certification is required.