SEVERN工程公司始建于1952年，由马丁·罗伯特·格罗斯和赫尔曼先生创始，SEVERN公司制造出弱磁仪和铁素体仪，现应用于世界各地。

SEVERN产品有：

SEVERN铁氧体指示计

SEVERN低MU渗透率示计

SEVERN铁氧指示仪2.0,2.5,3.5,5.0,10.0%产品介绍

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.

铁氧体指示器是一种简单、坚固、无损的检测仪器，专为实验室、商店和现场使用而开发。 GO、NO-GO 功能允许对奥氏体不锈钢焊缝金属进行即时验收测试。 该指标不需要外部标准，无需调整，无需视觉读数，并且不受位置影响。它在片材、板材、棒材、不规则形状的物体和复杂部件的单个零件上表现同样出色。它可以有效地定位高铁素体含量或低铁素体含量异质产品的区域。

描述

该指示器重3盎司。 长5英寸，适合手持操作。 所有金属部件均镀镍。 指示器及其插件装在一个漂亮的木盒中。该指示器符合 SEV-ENG-96002（I 型）或 SEV-ENG-96003（II 型）规范。该指标的两个特点值得特别提及。首先，附有磁铁的平衡梁允许在所有位置使用指示器，而无需由于重力而进行校正。其次，半球形磁体端部提供与插入件和测试材料的点接触。

操作

指示器的操作基于校准插入件和未知材料的***条形磁铁的相互吸引力。使用时，先插入外壳顶部。 然后，磁铁被一个取决于插入件铁氧体值的力吸引到插入件上。 然后，从外壳底部开口伸出的磁铁末端与被测材料接触。 接触表面必须清洁且无氧化皮或异物，这一点至关重要。 然后指示器沿垂直于接触表面的方向移开。 如果被测材料的铁素体含量高于校准插入物的铁素体含量，则当指示器移开时，磁铁将与插入物的底部完全分离。 当固定磁铁的金属环撞击塑料外壳的底部时，就会发生完全分离。 如果被测材料的铁素体含量低于插入值，则当指示器移开时，磁铁将首先与测试材料分离。 因此，通过更换插入件，可以对测试材料的铁素体含量进行划分。

铁氧体指示器可提供以下类型的校准：

I 型 – 铁素体***比 (%) 系统基于 Severn Engineering Co. 开发的内部铁素体标准，自 1954 年以来一直在使用。

II 型 – 铁素体值 (FN) 系统使用可通过一组涂层厚度标准追溯到***局的二级标准，并符合 ANSI/AWS 4.2-2006 的所有要求。 根据本规范的要求，II 型指示器配有额外的检查插入件。

SEVERN铁氧指示仪常用型号：

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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SEVERN铁氧指示仪2.0,2.5,3.5,5.0,10.0%产品介绍