Ferrite Indicators

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 it's Inserts are furnished in a handsome wooden box. The Indicator conforms to SEV-ENG-96002 (Type I) or SEV-ENG-96003 (Type II).

Operation
The operation of the Indicator is based on the mutual attraction of a permanent bar magnet to a known standard 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 designated % Ferrite or Ferrite Number. The end of the magnet projecting from the opening in the bottom of the case is then brought in contact with the material being tested. The Indicator is moved away in a direction perpendicular to the contact surface. If the material being tested has a Ferrite content higher than that of the insert, the magnet will first break contact with the Insert as the Indicator is moved away. On the other hand, if the Ferrite content of the material being tested is lower than that of the Insert, the magnet will first break contact with the material as the Indicator is moved away. Thus, by interchanging inserts, it is possible to bracket the Ferrite content of the material being tested.


Calibrations

The Ferrite Indicator is available with the following types of calibrations:
Type I - Percent Ferrite (%) Based on in-house Ferrite Standards developed by the Severn Engineering Co. and in continuous use since 1954.
Type II - Ferrite Number (FN) Based on using secondary standards traceable to the National Bureau of Standards (NIST) through a set of coating thickness standards and conforming to all of the requirements of ANSI/ASW A4.2-91, Sec. 6. Type II Indicators come with an additional Check Insert as required by that Standard.


Available Insert Values

Both models of the Ferrite Indicator are available with any combination of Inserts. Available Insert values are:

 

0.5
1.0
1.5
2.0
2.5
3.5
5.0
7.5
10.0
12.5
15.0
17.5
20.0
22.5
25.0


either as % Ferrite or Ferrite Number

We also offer 11.0 and 14.0 FN

 

Four Inserts are included in the price of each Indicator. Other less common insert values are available, please call for information. There is a charge for each additional Insert. All Inserts are calibrated for a specific Indicator. When ordering, please specify the Inserts desired. Instruments are delivered fully calibratedwith a Calibration Report showing the required values and quality information for the Instrument. Ferrite Indicators need to be recalibrated annually.