ENGLISH
Pag. 23
IIIC
Combustible dust group
T85 °C
Maximum surface temperature relating to combustible
dust
IP65
IP degree of protection (1st number: protection against
solids, 2nd number: protection against liquids) guaran-
teed when the optional dust cover is applied
Gb/Db
EPL, Equipment Protection Level Gb or Db suitable for
zone 1,2,21 and 22 surface installation
-20 °C ≤ Ta ≤ 50 °C
Ambient temperature range
Vmax 30 Vdc
Maximum voltage supply which can’t be applied instan-
taneously, or irreparable damage will occur. Maximum
voltage supply as operating condition: 24 Vdc.
Pmax 4,5 W
Maximum dissipated power (see instrument label)
Um 30 V
Maximum input voltage (according to EN /IEC 60079-11)
Thread
Thread used for the entries of the enclosure
3. Installation site prearrangement
3.1 Suitability of detectors in relation to the area of installation
If the detector is installed in a hazardous area, the user has to verify that the equipment is
suitable for the classified area and for the flammable substances present.
For ATEX certified detectors, the safety essential requirements against explosion risk in clas-
sified areas are described by European directives 2014/34/UE of 26/02/2014 and 1999/92/
CE of 16/12/1999.
The criteria to classify hazardous areas are described in the standard EN /IEC 60079-10-1 (for
explosive gas) and in the standard EN /IEC 60079-10-2 (for explosive dusts). The technical
requirements for electrical systems in classified areas are reported in the standard EN /IEC
60079-14.
Following the mentioned dispositions, the user has to choose the gas detector type on the
basis of these factors:
³
System type: Group II
³
Zone classification: 1, 2.
³
Zone classification: 21, 22.
³
Gas group: IIA, IIB or IIC
³
Dust group: IIIA, IIIB or IIIC
³
Gas temperature class: T6
³
Maximum dusts’ superficial temperature: T85 °C
Summary of Contents for SMART S-IS
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