Parker ETH Series - Explosion Subgroup; Temperature Classes; ATEX and Machinery Directive

Introduction
Operating / Mounting instruction
10 192-550003N10 ETH ATEX December 2019
Type of explosion protection
Designation
Applied standard
Pressurized encapsulation
d
EN 13463-3
Pressurized enclosure
p
EN 13463-7
Intrinsic safety
g
EN 13463-4
Gas retardant enclosure
h
EN 13463-2
(except category 1)
Constructional safety
c
Ex h
EN 13463-5
ISO 80079-37
1)
Ignition source monitoring
b
Ex h
EN 13463-6
ISO 80079-37
1)
Liquid immersion
k
Ex h
EN 13463-8
ISO 80079-37
1)
1
The ISO standard 80079-37 replaces the standard series DIN EN 13463 Parts
1,5,6 and 8.
1.5.5. Explosion subgroup
The explosion group is an indicator for the inflammability (explosive potential) of
gases (explosive atmospheres). The requirements for the equipment increase from
IIA to IIC.
Explosion subgroup
Examples for gases
IIA
Propane, acetone, ammonia, gasoline, benzene,
diesel fuel, heavy fuel, methane, methanol, propane
IIB
Ethylene, ethyl alcohol, hydrogen sulphide
IIC
Hydrogen, carbon disulphide, acetylene
Gas explosion subgroups of the Parker ETH electro cylinder (see page 11).
1.5.6. Temperature classes
Classification of flammable gases and vapors depending on their ignition
temperature:
Class
Maximum permitted material surface temperature [°C]
D1
450
T2
300
T3
200
T4
135
T5
100
T6
85
For flammable substances, the temperature class and the maximum permitted
surface temperature of the equipment are of essential importance.
1.5.7. ATEX and machinery directive
The ATEX directive is in effect since July 1st. 2003 and replaces the individual
laws of the respective countries with reference to explosive atmospheres. While
previously only referring to electrical devices, the directive now does also comprise
mechanical, hydraulic and pneumatic devices.
With reference to the machinery directive 2006/42/EC it must be taken into
consideration, that a number of external requirements stated in the ATEX directive
2014/34/EC refers to dangers occurring in explosive atmospheres, whereas the
machinery directive does only list requirements for explosion protection.
Hence, the ATEX directive 2014/34/EC is superior to the machinery directive with
reference to explosion protection in potentially explosive atmospheres. The
requirements of the machinery directive are however valid for all other dangers
when operating machines.