Temoin C

Temoin C quantity

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Description

Product information

Reference test block Temoin C is made of two rectified low carbon steel fit together with an air gap (0.015-mm). On each side of these bars, there are two magnets which are assembled top to bottom so that each bar may have a North and a South pole to its ends.

The length of the indication spectrum, which can be read on the right side and the left side, indicates the quality of the magnetic ink, which is used.

Usage:

Reference test block Temoin C is intended to be used systematically:

To check the performance of crack detection of magnetic inks and powders as part of the Quality Control at the manufacturing stage (7.1.1 of EN ISO 9934-2) and in use ( 7.1.2 of EN ISO 9934-2)
To compare the efficiency of magnetic inks and powders against reference samples.
To compare the performance of magnetic powders and inks of various types from the same source or from different sources.

Method:

Reference test block Temoin C is processed according to the method described in Appendix A of EN ISO 9934-2.
Note: Keep Reference test block C away from any magnetic field. Do not put it between the poles of any Magnetic Testing equipment in operation.

Preparation of the sample of the magnetic powder of ink:
Withdraw a sample of the new product. Refer to the relevant Technical Data Sheet.

Cleaning of the Reference test block Temoin C:
It must be cleaned using an appropriate method in order to ensure that is free of any contamination such as: Fluorescent material, oxides, grease and any other pollution.

Application of the Magnetic Testing product:
The magnetic ink or powder is applied on the Reference test block C according to the following parameters:
Spraying time: From 3 to 5 seconds.
Angle of inclination of the Reference test block C: 45° + 10 deg. with horizontal.
Spraying direction: 90° + 10° with the surface of the Reference test block C.

Viewing condition under ultraviolet (UV-A) light:  according to EN ISO 3059.
Ultraviolet (UV-A) illumination: ≥ 1000 microW/cm sq. (and even: ≥ 1500 microW/cm sq. according to some specifications) at the level of the surface under inspection.
White light illumination: ≤ 20 lux at the level of the surface under inspection.

Result:
The total length of the indications on the right and the left sides are to be recorded. The length of the two indications should be equal.
According to the materials, which are used for the manufacture of the Reference, test block C and the magnetic powder or ink, which is under testing, the indications maybe are not always the same length.
The indication is given from the external edges, since this measurement is proportional to the quality of the product:
Short   →  Bad
Long   →  Good

Establish the minimum limit not to be reached (for instance by recording the indications given by a used product)
Place on the Reference test block Temoin C a label on which the minimum value and the product name are written.

Final cleaning:
The Reference test block Temoin C must be cleaned according to an appropriate method to ensure that is free of magnetic ink or magnetic ink particles.

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Additional information

Manufacturer	Hoffmann