412LXR Series Product Manual
Appendix B – Internal Protection
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Appendix B - Internal Protection
The 412LXR is protected from its environment via a magnetically retained protective seal.
Daedal has conducted testing to determine the degree to which the positioner is protected by
using a British standard called an Ingress Protection Rating (IP Rating).
Definition
Reference: British standard EN 60529 : 1992
This standard describes a system of classifying degrees of protection provided by enclosures of
electrical equipment. Standardized test methods and the establishment of a two digit numeric
rating verify the extent of protection provided against access to hazardous parts, against ingress
of solid foreign objects, and against the ingress of water.
First Number – The first number indicates protection of persons against access to dangerous
parts and protection of internal equipment against the ingress of solid foreign objects.
1 - Protection against access to hazardous parts with the back of a hand, and protected
against solid foreign objects of 50 mm diameter and larger.
2 - Protection of fingers against access to dangerous parts, and protection of equipment
against solid foreign objects of 12.5 mm diameter and larger.
3 - Protection against access to hazardous parts with a tool, and protection against solid
foreign objects of 2.5 mm diameter and larger.
Second Number – The second number indicates protection of internal equipment against harmful
ingress of water.
0 - No special protection provided.
Note: Number Indicators above represent only a partial list of IP Rating specifications.
Warnings (Points of Clarity)
•
The specification applies to protection of particles, tools, parts of the body, etc., against access to
hazardous parts inside the enclosure. This does not cover external features such as switch pinch
points, pinch points causes by the motion of the carriage, or cable carrier assemblies.
•
The testing method as specified in the standard uses a solid steel rod of the appropriate diameter at a
specified force. The specification does not consider soft or pliable particles. Due to the design of the
table and sealing method, a soft particle can compress due to the motion of the table, and reduce its
cross-section. This can allow particles to enter the unit.
•
In application, shavings or chips commonly created in a machining operation are a greater concern. If
any edge or dimension of the “chip” is under the appropriate diameter, it can wedge under and start to
the lift the seals. This action will allow larger particles to do the same until failure is reached.
