Desoutter MR84-62-K ATEX Manual página 4

Part no 2050539693
Issue no 1
Series no B
Date 2013-06
Page 4
Description Value
Equipment group II
Equipment category 2
Group II
Atmosphere G
D
Safety design c
Gas group IIC
Max surface temperat-
ure in Gas atmo-
sphere
Max surface temperat-
ure in Dust atmo-
sphere
Ex Classification
If the motor is part of an assembly where the components have
different Ex classification, the component with the lowest level of
safety defines the Ex classification of the whole assembly.
Explosion prevention guidelines
In addition to the product instructions for air motors, the following
guidelines apply to explosion protected air motors.
Temperatures
– The maximum surrounding temperature for which the certific-
ation is valid is 40°C.
– 40°C is also the maximum allowed temperature of the com-
pressed air when it enters the motor.
– If the motor is installed in a equipment, the entire equipment
has to correspond to the guidelines 94/9/EC.
– Make sure that the compressed air fulfil our quality demands
(quality classes 2.4.3. and 3.4.4 respectively 3.5.4 acc. to
ISO/DIS 8573-1).
– Do not exceed maximum pressure of 6.3 bar, or as stated on
the motor nameplate. Exceeding the operating pressure can
increase the surface temperature due to higher rotating speed
and the motor can become an ignition source.
–
The following hotspots on the motor (as seen in the figure
above) can reach high temperatures during operation:
– motor housing
– seal ring at the output shaft
The highest temperatures occur when the motor is running at
full pressure without load. With increasing torque, the air motor
reduces the rotational speed and the temperature.
Cleanliness
– Make sure the motor is kept clean from dust and dirt to prevent
increased bearing and surface temperature.
– Make sure a silencer with a filtering effect at the air outlet is
installed to prevent any friction-heated particles entering into
the surrounding atmosphere.
Shaft load
All manuals and user guides at all-guides.com
Definition
Surface Industry
High level of protection
– zone 1 (gas)
– zone 2 (gas)
– zone 21 (dust)
– zone 22 (dust)
Atmosphere containing Gas, Va-
pors or Mist
Atmosphere containing Dust
Constructional safety
Hydrogene/ Acetylene
T1 = 450°C T2 = 300°C T3 =
200°C T4 = 135°C T5 = 100°C T6
= 85°C
Example temperatures: T85°C
T110°C T120°C T125°C T240°C
EN
– Make sure that the maximum shaft load stated in the section
Installation is not exceed, to prevent an excessive increaseof
the bearing temperature.
Installation
Air quality
– For optimum performance and maximum machine life we re-
commend use of compressed air with a maximum dew point
of +10°C. Installation of a refrigeration-type air dryer is recom-
mended.
– Use a separate air filter to remove solid particles larger than
30 microns and more than 90 % of water, installed as close as
possible to the machine and prior to any other air preparation
unit. Blow out the hose before connecting.
– The compressed air must contain a small quantity of oil. We
strongly recommend that you install a oil-fog lubricator. This
should be set according to air consumption by the air line tool
according to the following formula:
L = Air consumption (litre/s).
(May be found in our sales literature).
D = Number of drops per min (1 drop = 15 mm
L* 0.2 = D
this applies to the use of long work cycle air line tools. A single
point lubricator can also be used for tools with short running
cycles.
– For lubrication free motors it is an advantage if the compressed
air contains a small quantity of oil supplied from a fog lubric-
ator.
For further information please see Air Line Accessories in our
main catalogue.
Compressed air connection
– The machine is designed for a working pressure (e) of 6–7 bar
= 600–700 kPa = 87–102 psi.
– Blow out the hose before connecting.
– Recommended inlet hose size is 10 mm (3/8'').
– Recommended outlethose size is 16 mm (5/8'').
Connecting the air supply
When the compressed air supply is connected to the inlet, the dir-
ection of rotation will be as shown in the figure below. If the ex-
haust air is to be piped away, a hose should be connected to the
exhaust outlet.
The compressed air supply should be connected to the inlet that
gives the desired direction of rotation, see figure below. The inlet
tha is not in use functions as an additional outlet and must not be
plugged.
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