Ex Grounding Electronic Systems

Ex Grounding Electronic Systems

Hazardous Areas – Zone 1 / 2 (Gases)
Group II – Category 2G


The earthing control system is composed of a marine-grade copper-free aluminum enclosure, as described above, fitted with the earthing control electronic circuit SM-2001, usually set at 20 ohms, and authorized tanks loading/unloading when resistance is less than 20 ohms. They are used to control grounding continuity during tank loading and unloading operations. Tanks typically arrive electrostatically loaded, and an imperfect earthing might cause a spark leading to a fire.

An intrinsically safe barrier placed inside the equipment, connected via the included cable clamp kit to the electronic system, allows the on
and only verification of the correct/perfect ground connection of the tank.
The tank ground connection is to be made only with proper grounding clamp series IT (not included). The enclosure consists of NOT AVAILABLE red light, AVAILABLE green light, and INSERTION push button.

Red electronic system SM.. pilot light remains lit till grounding clamp IT series (not included) is connected to vehicle’s earthing bar. The insertion push button is pressed for at least 2 seconds. If the resistance measured by the electronic circuit is less than 20ohms, the SM electronic system allows loading and unloading operations. Earthing clamp for verification usually is complete with 8m of cable.

Reference Standards

SM2021F Electronic System SM2021IIC Electronic System
Execution ( II 2 G) Ex db IIA or IIB or IIB+H2 T6…T3
( II 2 G) Ex db [ia/ib IIA or IIB or IIC Ga]
IIA or IIB or IIB+H2 T6
( II 2 D) Ex tb IIIC T85°C…T200°C
( II 2 D) Ex tb [ia Da/ib] IIIC T85°C
 II 2 G Ex db IIC T6…T3
II 2 G Ex db [ia/ib/ic IIA or IIB or IIC
Ga/Gc] IIC T6…T3
II 2 D Ex tb IIIC T85°C…T200°C
II 2 D Ex tb [ia Da/ib/ic Dc]
IIIC T85°C…T200°C
Rules of Compliance EN/IEC 60079-0; EN/IEC 60079-1;
EN/IEC 60079-11; EN/IEC 60079-31
EN/IEC 60079-0; EN/IEC 60079-1;
EN/IEC 60079-11; EN/IEC 60079-31;
EC Type-Examination Certificate INERIS 13 ATEX 0022X INERIS 13 ATEX 0023X
Protection Degree IP66 IP66
Ambient Temperature -60°C ÷ +80°C -60°C ÷ +80°C
Other Available Certificates Component: INERIS 13 ATEX 9019U

IECEx: IECEx INE 13_0070X
EAC: TC RU C-IT.ГБ02.B.00689/18
RINA: ELE18111CS_012
NEC 505: UL 20141125-E344596 –
Type rating NEMA 1, 12, 4 and 4X

Component: INERIS 13 ATEX 9019U

IECEx: IECEx INE 13.0071X
Component: IECEx INE 13.0085U
EAC: TC RU C-IT.ГБ02.B.00689/18
(RMRS): 19.02523.280



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