Sensitron SMART3G-D3 - Installation Site Prearrangement; Suitability of Detectors in Relation to Area; General Precautions

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Pag. 24
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 classied area and for the ammable substances present.
Th safety essential requirements against explosion risk in classied 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 60079-10-1 (for
explosive gas) and in the standard EN 60079-10-2 (for explosive dusts). The techincal requi-
rements for electrical systems in classied areas are reported in the standard EN 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 classication: 2 or 22
³ Gas group: IIA, IIB or IIC
³ Dust group: IIIA, IIIB or IIIC
³ Gas temperature class: T*
³ Maximum dusts’ supercial temperature: * °C
* see data reported on the label
3.2 General precautions
At the mounting and installation phase, be sure all safety precautions have been conside-
red. Always remember how important the correct positioning of gas detectors is to get the
optimum response.
Be careful:
³ never to install gas detectors close to air intakes or fans causing strong air currents.
³ the detectors are attached to a rm base to prevent vibration that can damage them,
producing unreliable results. Although the electronics comply with the electromagne-
tic compatibility rules, it is advised to keep the detectors at a distance from any radio
frequency senders (such as radio links or similar).
³ that detectors are placed in a convenient location for future maintenance and calibra-
tion requirements
IIIC Combustible dust group
T*** °C Maximum surface temperature relating to combustible
dust
IP65 IP degree of protection
Gb/Db EPL, Equipment Protection Level Gb or Db suitable for
zone 2 and 22 surface installation
* °C ≤ Ta ≤ * °C Ambient temperature range
Vmax 28 Vdc Maximum power supply.