Technical information
WIKA data sheet IN 00.18
Page 1 of 6
Notes on equipment protection per EN/IEC 60529 and NEMA
For Bourdon tube or diaphragm pressure gauges
General information
This technical information describes the measures to prevent
both the formation of condensation within a hermetically
sealed case, and also the intrusion of water into cases
vented to the atmosphere. It applies for both Bourdon tube
pressure gauges and diaphragm pressure gauges.
is based on the physical fact that the humidity found in air,
under particular conditions, settles on cold surfaces as
condensation. The warmer the air, the more humidity it can
hold. If the air cools (e.g. at the window of a gauge), then
the air can only hold a small amount of humidity. The excess
humidity settles as condensation on the window.
1. Introduction and explanation of physical conditions
The formation of condensation in the cases of hermetically sealed, unfilled instruments cannot generally be avoided. This
In addition, water in the form of splash, jet and rain water
from outside can intrude into the case, so long as the instru-
ment is vented to atmosphere.
2. Explanation of the degrees of protection per EN/IEC 60529
Degrees of protection against solid foreign bodies, defined by the first index number
First index
number
Degree of protection
Code designation
Definition
0
Not protected
–
1
Protected against solid foreign bodies of 50 mm
diameter and larger
The object probe, a round body of 50 mm diameter, must not fully
intrude
1)
2
Protected against solid foreign bodies of 12.5 mm
diameter and larger
The object probe, a round body of 12.5 mm diameter, must not fully
intrude
1)
3
Protected against solid foreign bodies of 2.5 mm
diameter and larger
The object probe, 2.5 mm in diameter, must not intrude at all
1)
4
Protected against solid foreign bodies of 1.0 mm
diameter and larger
The object probe, 1.0 mm in diameter, must not intrude at all
1)
5
Dust protected
Ingress of dust is not completely prevented, but dust may not intrude
in a such a quantity that the satisfactory operation of the instrument
or safety is impaired
6
Dust tight
No ingress of dust
1) The full diameter of the object probe must not pass through any opening in the case.
Illustration 1
Source: EN/IEC 60529
WIKA data sheet IN 00.18
∙
06/2016
GARDNER DENVER
APP457
Содержание Reavell 5236
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