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سازمان بين المللى مترولوژى:
اين سازمان يك موسسه بين المللى رسمى براى استاندارد نمودن مقررات و شيوه هاى كنترل
مترولوژى (اندازه گيرى) است. اين مقررات توسط ادارات اوزان و مقادير كشورهاى عضو پذيرفته
شده است. لودسل هاى داراى گواهينامه OIML بعنوان يك وسيله اندازه گيرى قانون در سراسر
اروپا شناخته مى شوند.
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International Organization of Legal Metrology is a World-Wide organization
whose aims are to standardize regulations and metrological controls applied by the
Weights and Measures of its member states. OIML certified load cells can be used
as a module in Type Approval Certificates (TACs) throughout Europe.
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گواهينامه Ex: اين
گواهينامه براى محصولاتى كه شرايط هماهنگ استانداردهاى اروپايى را رعايت مى كنند صادر
مى شود. EN50.014 شرايط عمومى براى وسايل الكترونيكى را در محيط هاى انفجارى بيان مى
كند. EN50.020 و EN50.018 درجه مقاومت وسيله در مقابل آتش سوزى را مشخص مى نمايند.
EEx ia و EEx ib مشخصات آن دسته از وسايل الكترونيكى را معين مى كند كه مى توانند به
ترتيب در زون هاى صفر و يك مورد استفاده قرار گيرند.
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Ex Certificates of Conformity are issued for products which have been found
to comply with the harmonized European standards: EN 50.014 general requirements
for electrical apparatus for potentially explosive atmospheres, EN 50.020 intrinsic
safety "i" and EN 50.018 Flameproof enclosure "d". Products labelled EEX ib and
ia can be used in zone 1/2 and zone 0 applications, when connected to approved intrinsically
safe circuits (barriers, etc.) and installed properly.
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استاندارد ارزيابى ملى:
NTEP مجموعه مقرراتى است كه با همكارى موسسه ملى اوزان و مقادير و انجمن اوزان و مقادير
آمريكا و دست اندركاران ساخت وسايل توزين تهيه شده است.
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National Type Evaluation Program is a program of cooperation between the
National Conference on Weights and Measures, NIST (USA), state weights and measures
officials, and the private sector for determining conformance weighing equipment
with provisions of Handbook 44.
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Factory Mutual System:
اين گواهينامه آمريكايى براى نشان دادن درجه ايمنى كالا مى باشد. تمام محصولاتى كه
داراى اين گواهينامه هستند، مى توانند در محيط هاى صنعتى پر خطر مورد استفاده قرار
گيرند.
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Factory Mutual is the American approval for intrinsic safety. All products
showing this symbol have been approved for use in hazardous areas provided safety
barriers are used and properly installed.
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درجه حفاظت IP: اين
درجه بندى كه توسط نظام بين المللى حفاظت تعريف شده است، ميزان آب بندى وسايل الكترونيكى
را بر اساس IEC529 و IEC60.529 تعيين مى كند.
IP66: مقاوم در مقابل ريزش پر فشار آب
IP67: مغروق در آب
IP68: مغروق در آب تحت فشار
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IP Rating given by the International protection System, defines environmental
sealing of electrical enclosures are prescribed by IEC 529 / EN60.529. Protection
is provided against.
IP66: Exposure to strong jets of water
IP67: Immersion in water
IP68: Indefinite immersion in water
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INTRODUCTION TO IP-RATINGS |
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The IP rating system provides a means of classifying
the degree of protection from dust and water afforded by electrical equipment and
enclosures. The system is recognized in most countries and is set out in a number
of standards, including IEC 60529. |
1st Digit:
Protection against foreign, solid objects |
2nd Digit:
Protection against liquids and moisture |
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IP x… |
Description / Test |
IP ...y |
Description / Test |
|
0 |
 |
No Protection. |
0 |
 |
No Protection. |
|
1 |
 |
Protected against solid objects Over 50 mm, e.g. accidental
Touch by hands. |
1 |
 |
Protected against vertically falling drops of water. |
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2 |
 |
Protected against solid objects Over 12 mm, e.g. fingers. |
2 |
 |
Protected against direct sprays of water up to 15˚ from
the vertical. |
|
3 |
 |
Prtected against solid objects Over 2.5 mm, ( tools / wires
) |
3 |
 |
Protected against sprays to 60˚ from the vertical. |
|
4 |
 |
Protected against solid objects Over 1 mm, ( tools / wires
/small wires ). |
4 |
 |
Protected against water sprayed from all directions – limited
ingress permitted. |
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5 |
 |
Protected against dust – limited Ingress ( no harmful deposit
). |
5 |
 |
Protected against low pressure jets of water from all directions
- limited ingress permitted. |
|
6 |
 |
Totally Protected against dust. |
6 |
 |
Protected against strong jets of water, e.g. for use on
shipdecks – limited ingress permitted. |
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Example:
IP67: Totally Protected against dust and Protected against the effects of immersion
between 15 cm and 1 m. |
7 |
 |
Protected against the effects of immersion between 15 cm
and 1 m. |
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|
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8 |
 |
...m
Protected against long periods of immersion under pressure. |
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