Areas with potentially explosive atmospheres are divided into zones, equipment has to be divided into groups and categories. The labeling on the identification plate of certified equipment indicates in which zone the explosion protected flow switch can be used.
The flow switch, produced by "A.YITE TECH", could used in all Zone, Zone 0, Zone 1, Zone 2. the highest grade is ExiaIICT6, ExdIICT6, we still could supply ExdIIBT4, all products is ATEX certificate.
The GE-316 Flow Switch, Intrinsic Safety products, the grade could be 1GD ExiaIICT6, the work voltage is 12VDC or 24VDC, it could work for Zone 0, Zone 1, Zone 2. zones 20, 21 and 22
the GE-341 is flame proof flow switch, the grade could be 2GD ExdIIBT4 (we could customized 2GD ExidIICT6 or 1GD ExiaIICT6), the work voltage is 12VDC or 24VDC, it could work for Zone 1, Zone 2. zones 20, 21 and 22
Equipment groups determine, in which zones the equipment may be installed. Once again there are six categories. Categories 1G, 2G and 3G are classifications for gas explosion protection (G = Gas); thereby 1G equipment is suitable for use in zones 0, 1 and 2, 2G equipment is suitable for use in zones 1 and 2 and 3G equipment is suitable for use in zone 2.
Categories 1D, 2D and 3D are classifications for dust explosion protection (D = Dust); thereby 1D equipment is suitable for use in zones 20, 21 and 22, 2D equipment is suitable for use in zones 21 and 22 and 3D equipment is suitable for use in zone 2.
Explosion proof equipment, installed within an Ex area, is divided into 6 temperature classes (T1 to T6). The
temperature class is not – as it is often wrongly believed – the operating temperature range of the equipment, but the maximumpermissible surface temperature of the equipment, in relation to + 40°C ambient temperature on any surface area, which may not be exceeded at any time. The maximum surface temperature must remain below the ignition temperature of the surrounding medium at all times. The equipment design requirements increase from T1 to T6.
Explosion protected equipment for gases, mists and vapors is divided into three explosion groups (IIA-IIB-IIC) according to the type of protection being used. The explosion group is a means to measure the ignitability of gases (potentially explosive atmos-pheres). The equipment requirements increase from IIA to IIC.
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