6
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Outlet silencer
Central silencer
Sound levels
Sound levels are measured at free speed with the measuring instrument
positioned 1 m away from the air motor, see the table below
Air
Free outlet
With outlet
Exhaust air removed
motor
silencer
with pipes to
another room
dB
(A)
dB
(A)
dB
(A)
Please refer to the technical catalog PDE2539TC
The noise from an air motor consists of both mechanical noise and a
pulsating noise from the air flowing out of the outlet. The installation of
the motor has a considerable effect on mechanical noise. It should be
installed so that no mechanical resonance effects occur. The outlet air
creates a noise level which can amount to 108 dB(A) if the air is allowed
to exhaust freely into the atmosphere. To reduce noise levels, various
types of outlet silencer are used. The most common type screws
directly into the outlet port of the motor. A wide range of silencers are
available. Many are made of sintered brass or sintered plastic. Since the
motor function causes the exhaust air to pulsate, it is a good idea to
allow the air to exhaust into some kind of chamber first, which reduces
the pulsations before they reach the silencer. The best silencing method
is to connect a soft hose to a central silencer allowing the speed of the
air to reduce as much as possible.
NOTE!
Remember that if a silencer is too small or is blocked, back
pressure is generated on the outlet side of the motor, which in turn
reduces the motor power.
5.9 Silencing
6. Operation
6.1 Check List
This check list shows all activities, which have to be performed prior
to the use of the air motor in an Ex-area (according to the guideline
94/9/EC – previously ATEX 100a).
Test prior to use of motor in EX-area
Checked Reference
Chapter
Do the following specifications of the tag on
the air motor agree with the required
specifications of the Ex-area:
4.3
• design group
4.4
• design category
• Ex-area
• temperature class
• maximum surface temperature
Has it been confirmed that during the
installation of the air motor there were no
5.1
explosive atmospheres, such as oils, acid,
gas, steam or radiation?
Is the ambient temperature in accordance
5.3
with requirements?
Has it been certified that the air motor is
sufficiently ventilated and that there is no
5.5
additional warming source (such as a clutch)?
Is a formal EC-Declaration of Conformity in
accordance with guideline 94/9/EC available
5.5
for all components that will be at-tached to
the air motor?
This check list shows all activities, which have to be performed during
the use of the air motor in an Ex-area (according to the guideline 94/9/
EC – previously ATEX 100a).
Test during use of motor in Ex-area
Checked Reference
Chapter
After approximately 1.5 hours of operation,
measure the surface temperature.
A temperature increase of over 40K is not
6.3
allowed.
Example:
T
max
= T
U
+
r
T = 20°C + 40K = 60°C
If a temperature increase >40K occurs
immediately stop the drive and contact
Parker!
6.2 Motor Operation
Make sure that all air supply parts are correctly
connected, prior to motor operation.
Do not step into the air stream
Turn the air-supply to “ON”.
If necessary, adjust the air-pressure or the flow-pressure to
achieve the required speed or torque.
Adjust the oiler as described in chapter 5.7 – paragraph
„Lubrication“.
Regularly check the oil-level and if necessary refill the oil
container.
The motor needs to be cleaned on a regular basis to avoid
a dust deposit with a more than 5-mm thickness.
6.3 Measure Surface Temperature
(if motor is used in an explosive area)
The details of the maximum allowable surface
temperature as shown on the motor tag are based
on measurements under normal environmental and
installation conditions. Small changes to those
conditions (such as a constructed installation area)
will considerably effect the temperature
development!
Measure Surface Temperature
It is very important to measure the surface temperature of
the motor during operation. Measurement can be done
using conventional temperature measuring instruments.
The surface temperature should be taken at the marked
measuring point as specified on the dimensions (see
chapter 5.6).
The maximum allowable surface temperature is reached
after approximately 1.5 hours of operation. This maximum
temperature may not increase more than 40K.
Ambient temperature in the Ex-area: -20°C to +40°C
If the surface temperature exceeds the mandate, the
motor must be stopped immediately.
Please immediately contact Parker!
