Hazardous Area Zone 1 & Zone 2 ATEX | Remote Control Units & Emergency Shutdown Stations

Remote Control Units

EXHEAT remote control units and emergency shutdown stations are designed to offer a local interface for equipment in the field, controlled by a remote source. These units can be manufactured for use in both hazardous and non-hazardous areas, having the control facility for on and emergency stop, with indications for on and fault status.

All products are supplied with full wiring schematics and hazardous area certification as required. Suitable cable gland kits can also be provided to ensure a one-stop cost effective solution. All units are provided with our standard warranty and are built and tested in our ISO 9001 certified UK factory, ensuring that EXHEAT’s unrivalled high standards are incorporated throughout all of our products.

 

HAZARDOUS AREA CLASSIFICATION

• ATEX / IECEx / GOST: Zone 1, 2, 21, 22
• NEC 505 Class 1: Zone 1, 2
• NEC 500: Class I Div 2; Class II Div 1, 2; Class III Div 1, 2

ATEX 94/9/EC	ATEX / IECEx Ex II 2 G II2 G Ex db IIC II2 D Ex tb IIIC (T85°C — T150°C) II2 G Ex ed II T6 II2 D Ex tD A21 T85°C
IECEx	Ex db IIB T6 Ex tb IIIC (T85°C — T150°C) Ex ed II T6 Ex tD A21 T85°C
Inmetro	Ex db IIB T6 Ex tb IIIC (T85°C — T150°C) Ex ed II T6 Ex tD A21 T85°C
GOST-R (RTR-N)/K	1 Ex d IIB T6 Ex tD A21 (T85°C — T150°C) Ex ed Gb IIC T6 Ex t IIIC Db Ex tD A21 T85°C
NEC505 USL	Class 1, Zone 1 Ex db IIB Zone 21 Ex tb IIIC (T85°C — T150°C)
NEC505 CNL	Ex d IIB Class II, Group E, F, G

Ex d & Ex de flameproof concepts

Ex d – “Flameproof Enclosure” Protection EN 50018 where the potentially explosive or incendive components are contained within an enclosure into which the flammable atmosphere can enter but which will contain any resultant explosion and prevent its transmission outside the enclosure into the hazardous area. Ex de solutions combine the benefits of both the increased safety Ex e and flameproof Ex d types of protection.

explosion protection type flameproof Ex d explained

hazardous area equipment protection levels

Ga	Gb	Gc	Da	Db	Dc	Ma	Mb
Zone 0	Zone 1	Zone 2	Zone 20	Zone 21	Zone 22	Energised	De-energised*

• G=gas, D=dust, M=mining
• *in presence of explosive atmospheres

hazardous areas & T CLASSes

Temperature class is defined by ignition temperature – the lowest temperature at which a vapour will be ignited.

Flashpoint is the lowest temperature at which a liquid generates sufficient vapour to support ignition – this vapour could be ignited by temperature or energy (i.e. a spark).

Temperature Class	Max. Surface Temperature
T1	<450ºC – eg Acetone/Methane Gas Group IIA
T2	<300ºC – eg Butane/Propane Gas Group IIA
T3	<200ºC – eg Heptane/Ethylene Gas Group IIA
T4	<135ºC – eg Ethyl Methyl Ether/Hydrogen Gas Group IIB
T5	<100ºC
T6	<85ºC

• there is no connection between ignition energy and ignition temperature

EXHEat

T&D are Master Distributors & Stockists for EXHEAT, a world leader in the design and manufacture of Hazardous Area Electrical Process Heaters & Control Systems for the global oil, gas and petrochem industries.

➡ Did you know? EXHEAT FAW hazardous area air warmers provide lightweight air warming where the potentially explosive atmosphere is classified as a Zone 1 or 2 (IIA, IIB, IIC) gas group.

➡ T&D Hazardous Area Sales Team are trained and certificated according to the CompEx Scheme – a global solution for validating core competency of employees and contract staff of major users in the gas, oil and chemical industries.