Parker ETH - Intended Use and ATEX Requirements

Parker EME
Introduction
192-550004N2 ETH ATEX November 2013 11
1.6 Intended use
The linear actuator has a number of uses including:
Positioning, transporting, feeding, removing, pallet handling, loading, unloading,
processing and manipulating as well as testing work pieces or tools.
Since the component can be used in a very wide range of applications, the user is
responsible for its use in specific applications.
Please make sure that the mounting of parts or tools will not pose a threat to
persons or cause damages to any parts or devices. This also applies, for example,
to the case of a broken toothed belt (if existing).
The linear actuator must only be used in areas that are not accessible to persons
during operation.
If the linear actuator is used in areas accessible to people, it must be installed in
such a manner that no one can be endangered during operation.
ATEX specific requirements
Strict adherence to the intended use of ATEX certified cylinders is the
absolute prerequisite for their use in explosive atmospheres.
If the ETH cylinder is used as intended, the ignition temperature is not exceeded in
any part of the ETH cylinder. The ETH cylinder is heated by the thermal effect of
the motor or the gearbox as well as by the frictional heat generated by the spindle
nut and the bearings, the latter however only if the cylinder is in motion. The
relevant heating occurs with high force, travel speed and cycle time of the spindle
nut. Therefore, the thermal behavior of the ETH cylinder must be taken into
consideration when sizing a drive application. The thermal behavior is therefore
verified for the ATEX application data provided by the user. If needs be, the ATEX
application data must be adapted (e.g. reduction of the cycle time)
Besides the heating behavior of the cylinder, the following boundary conditions
must be respected when using the cylinder in explosive atmospheres:
 The ETH is especially designed for the use in explosive atmospheres in
accordance with the specifications of the ATEX directive 94/9/EC.
 Each application is tested by Parker on the basis of the ATEX application data
provided by the user and is then certified in accordance with the ATEX directive
94/9/EC.
 The operation of the electro cylinder is only permitted within the limits of the
ATEX application data provided by the user. Those are:
 ETH Order code
 Application specific force
1
time diagram or force stroke diagram
2
(axial thrust force at the cylinder rod)
 Application specific position time diagram or as movement
3
(jerk, acceleration,
speed, stroke)
 Maximum ambient temperature
In general it must be taken into consideration, that the maximum ambient
temperature of the ETH cylinder is the temperature which can act upon any spot
of the cylinder surface when the thrust rod is extended.
In addition, it applies for the measurement:
 Linear interpolation of F(x) or F(t) between interpolation points.
 For x(t), no interpolation between interpolation points.
1
Axiale Vorschubkraft an der Zylinderkolbenstange
2
Darstellung in einer Stützpunkttabelle (Papier / elektronisch)
3
Darstellung in einer Stützpunkttabelle (Papier / elektronisch)