ATEX and IECEx - Limit switches

II 3G Ex dc ec IIB T5 Gc / II 2D Ex tb IIIC T85°C Db / Zona 2-21 (Gas and Dust)

Limit Switches FGR2-Ex, certified ATEX and IECEx, in aluminum and antistatic plastic case, suitable for use in Zone 2 (Gas) and Zone 21 (Dust).
The device works through a gear transmission, drives a cam system operates on 4 or 6 microswitch that after a certain number of revolutions predispose the engine or equipment at startup or at the stop. Each cam is provided with an adjusting screw to adjust “micrometer” that operates independently, and thus can calibrate the ‘opening and closing of each microswitch according The necessary functional requirements. The gear drive system allows to choose different ratios and can be provided even in twin rear shaft version.

Reference standards: EN 80079-34, EN 60947-3, EN 61241-0, EN60079-0, EN60079-31, EN60079-15.
Directive: ATEX 2014/34 /EU

Zone 2: Area in which an explosive atmosphere in the form of gas concentration in the air can occur for a short period due to a breakdown or malfunction.
Zone 21: Area in which an explosive atmosphere in the form of a cloud of combustible dust in the air is likely to occur during normal operation.

TYPE OF PROTECTION GAS: Restricted breathing case (Ex “dc ec”)
MARKING: II 3GD Ex dc ec IIB T5 Gc according to IEC 60079-0; 60079-15.
PRINCIPLE: limited in power dissipation (ΔT limited), so the depression which is created when de-energized, is such as to delay the entry of explosive atmosphere for a time limit specified by the standard.

TYPE OF PROTECTION DUST: Protection by enclosure (Ex “tb”).
MARKING: II 3GD Ex tb IIIC T 85°C Dc according to IEC 60079-0; 60079-31
PRINCIPLE: The coupling of the enclosure is hermetically sealed with special seals, so that the combustible dust cannot enter. The outer surface temperature is limited.

Aimed at controlling the revolutions of the rotating parts of industrial and construction machinery such as drum winding ropes, machines, gates, cranes etc…
The type of enclosure designed and adopted internal components, conform this equipment for use in areas with potential explosive atmosphere for both gas and dust according to ATEX Directive 2014/34/EU.

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