Ex i, intrinsically safe, for zones 0, 1, 2, 20, 21 or 22
The sensor is a standard-type RTD or TC temperature sensor (no ATEX/IECEx requirements)
The connection head or box is a standard-type, IP 65-protected head, with a protective earth connection screw (no ATEX/IECEx requirements)
The whole circuit must be designed as an intrinsically safe Ex i circuit (cable length, ATEX/IECEx transmitters, ATEX/IECEx barriers).
EPIC® SENSORS standard RTD types (Pt100) have been investigated for applying in Ex i circuits by an authorized body VTT Expert Services Ltd (nowadays Eurofins Expert Services Oy), and the resulting statement can be downloaded here: STATEMENT VTT-S-08226-13 (pdf).
Even though no certificate for this kind of simple passive apparatus is required by standards, it is sometimes needed for other reasons. Lapp Automaatio Oy has rights to produce Ex i type temperature sensors if needed. This is given in our production quality documents ATEX QAN (pdf) and IECEx QAR (link). Certified Ex i type sensors are produced only on request.