SEVERN工程公司始建于1952年，由馬丁·羅伯特·格羅斯和赫爾曼先生創(chuàng)始，SEVERN公司制造出弱磁儀和鐵素體儀，現應用于世界各地。
SEVERN產品有：
SEVERN鐵氧體指示計
SEVERN低MU滲透率示計
SEVERN鐵氧指示儀2.0,2.5,3.5,5.0,10.0%產品介紹
The Ferrite Indicator is a simple, rugged, non-destructive inspection instrument developed for laboratory, shop and field use. The GO, NO-GO feature permits instant acceptance testing of austenitic stainless weld metals. The Indicator requires no external standards, no adjustments, no visual readings and is unaffected by position. It performs equally well on sheets, plates, rods, irregular shaped objects and individual parts of complex components. It is effective in locating areas of high or low Ferrite content heterogeneous products.
Description
The Indicator weighs 3 oz. and is 5 inches long making it comfortable for hand held operations. All metal components are bright Nickel plated. The Indicator and its Inserts are furnished in a handsome wooden box. The Indicator conforms to specification SEV-ENG-96002 (Type I) or SEV-ENG-96003 (Type II). Two features of the Indicator deserve special mention. First, the balanced beam to which the magnet is attached permits the use of the Indicator in all positions without correction due to gravity. Secondly, the hemispherical magnet ends provide point contact with the inserts and the test materials.
Operation
The operation of the Indicator is based on the mutual attraction of a permanent bar magnet for a calibrated insert and an unknown material. In use, an insert is screwed into the top of the case. The magnet is then attracted to the insert by a force dependent upon the insert’s ferrite value. The end of the magnet projecting from the opening in the bottom of the case is then brought into contact with the material being tested. It is essential that the contact surface be clean and free from oxide scale or foreign material. The Indicator is then moved away in a direction perpendicular to the contact surface. If the material being tested has higher ferrite content than that of the calibrated insert, then the magnet will completely separate from the bottom of the insert as the Indicator is moved away. A complete separation occurs when the metal collar holding the magnet strikes the bottom of the plastic case. If the ferrite content of the material being tested is lower than that of the insert value, the magnet will first separate from the test material as the Indicator is moved away. Thus, by interchanging the inserts, it is possible to bracket the ferrite content of the materials under test.
The Ferrite Indicator is available with the following types of calibrations:
Type I – Percent Ferrite (%) system based on in-house Ferrite Standards developed by the Severn Engineering Co. and in continuous use since 1954.
Type II – The Ferrite Number (FN) system uses secondary standards traceable to the National Bureau of Standards through a set of coating thickness standards and conforms to all of the requirements of ANSI/AWS 4.2-2006. Type II Indicators come with an additional Check Insert as required by this specification.
鐵氧體指示器是一種簡單、堅固、無損的檢測儀器，專為實驗室、商店和現場使用而開發(fā)。 GO、NO-GO 功能允許對奧氏體不銹鋼焊縫金屬進行即時驗收測試。 該指標不需要外部標準，無需調整，無需視覺讀數，并且不受位置影響。它在片材、板材、棒材、不規(guī)則形狀的物體和復雜部件的單個零件上表現同樣出色。它可以有效地定位高鐵素體含量或低鐵素體含量異質產品的區(qū)域。
描述
該指示器重3盎司。 長5英寸，適合手持操作。 所有金屬部件均鍍鎳。 指示器及其插件裝在一個漂亮的木盒中。該指示器符合 SEV-ENG-96002（I 型）或 SEV-ENG-96003（II 型）規(guī)范。該指標的兩個特點值得特別提及。首先，附有磁鐵的平衡梁允許在所有位置使用指示器，而無需由于重力而進行校正。其次，半球形磁體端部提供與插入件和測試材料的點接觸。
操作
指示器的操作基于校準插入件和未知材料的永久條形磁鐵的相互吸引力。使用時，先插入外殼頂部。 然后，磁鐵被一個取決于插入件鐵氧體值的力吸引到插入件上。 然后，從外殼底部開口伸出的磁鐵末端與被測材料接觸。 接觸表面必須清潔且無氧化皮或異物，這一點至關重要。 然后指示器沿垂直于接觸表面的方向移開。 如果被測材料的鐵素體含量高于校準插入物的鐵素體含量，則當指示器移開時，磁鐵將與插入物的底部完全分離。 當固定磁鐵的金屬環(huán)撞擊塑料外殼的底部時，就會發(fā)生完全分離。 如果被測材料的鐵素體含量低于插入值，則當指示器移開時，磁鐵將首先與測試材料分離。 因此，通過更換插入件，可以對測試材料的鐵素體含量進行劃分。
鐵氧體指示器可提供以下類型的校準：
I 型 – 鐵素體百分比 (%) 系統基于 Severn Engineering Co. 開發(fā)的內部鐵素體標準，自 1954 年以來一直在使用。
II 型 – 鐵素體值 (FN) 系統使用可通過一組涂層厚度標準追溯到國家標準局的二級標準，并符合 ANSI/AWS 4.2-2006 的所有要求。 根據本規(guī)范的要求，II 型指示器配有額外的檢查插入件。
SEVERN鐵氧指示儀常用型號：
SEVERN 0.5%
SEVERN 1.0%
SEVERN 1.5%
SEVERN 2.0%
SEVERN 2.5%
SEVERN 3.5%
SEVERN 5.0%
SEVERN 7.5%
SEVERN 10%
SEVERN 12.5%
SEVERN 15%
SEVERN 17.5%
SEVERN 20%
SEVERN 22.5%
SEVERN 25%
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如果有任何關SEVERN鐵氧指示儀2.0,2.5,3.5,5.0,10.0%的疑問，請隨時與我們聯系，（021-3100 6702），我們將盡全力解決您的問題。
If you have any question, please feel free to dial 0086-21-3100 6702 or browse our website:www.www.agcjj.cn.
SEVERN鐵氧指示儀2.0,2.5,3.5,5.0,10.0%產品介紹
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