Oldham olct ir, Technical Manual

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20 User Manual
7. Special instructions for use in ATEX explosive
atmospheres and for functional safety
7.1 Use in ATEX explosive atmospheres
Generally, ambient temperature, voltage supply and power mentioned below relate to safety against explosion. These
parameters are not metrological data (refer to the technical characteristics table).
- Conformity to European Harmonized EN standards and to international IEC standards:
The OLCT IR complies with the following standards:
Protection against explosion:
EN 60079-0:2012 IEC 60079-0 (ed.6):2011
EN 60079-1:2007 IEC 60079-1 (ed.6):2007
EN 60079-7:2007 IEC 60079-7 (ed.4):2006
EN 60079-11:2012 IEC 60079-11 (ed.6):2011
EN 60079-31:2014 IEC 60079-31 (ed.2):2013
Performance standards (metrology) for Methane and Propane:
OLCT IR detectors conform to EN 61779-1:2000 and EN 61779-4:2000 standards, Suitability requirements for
the operation of flammable gas detectors, category 0 to 100% LEL Group II, reference gas 0-100% LEL
Methane and Propane.
These detectors are classed as safety devices according to ATEX 94/9/CE Directive and may, therefore,
contribute to limiting the risks of explosion. For this to be so, they must be connected to Oldham type MX 15,
MX 32, MX 42A, MX 48, MX 43, MX 52 or MX 62 detection controllers, or otherwise connected to
measurement systems with 4-20 mA inputs conforming to section 1.5 of Annex II of ATEX Directive 94/9/CE
and compatible with their characteristics (see transfer curve).
Electromagnetic Compatibility:
EN 50270:2006 Typ 1 and 2
- Operating Zones:
the equipment is authorized for use in zones 1, 2, 21 and 22 for ambient temperatures between -50°C to + 65°C
(Note that the maximum functioning temperature is +55°C).
- Installation:
Orientation: the OLCT IR detector must be installed horizontally, with the arrow on the protective cover
looking upward.
Cable entry: the cable gland used shall be IP 66 or IP 66/67 certified according to EN 60529 or IEC 60529,
M20 x1.5 typ and match with the detector operating temperature. It shall be increased safety certified (‘e’) for
use in explosive atmospheres and will be mounted according to IEC/EN 60079-14 standard, edition in force,
and to additionnal requirements from local standards
- Wiring/ Connections:
Wiring must comply with existing standards about installations in explosive atmospheres, especially IEC/EN
60079-14 and IEC/EN 60079-17 standards. Cables must be protected against mechanical shocks.
When conductors are connected to the terminal, the distance between live components and grounded metallic
parts must be greater than 2.5mm.
- Grounding:
The detector must be connected to the ground via its external ground connection (see Fig. 1). This connection
must be protected against corrosion.
- Power supply: