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CIRCOGRAPH : Eddy-Current Testing with
Rotating Sensors
(Division TS)
Eddy-current testing with rotating sensors guaranteeing maximum detection sensitivity for surface-exposed, longitudinally oriented flaws on bright material.
FOERSTER offers various configuration levels, ranging from the single-channel, low-cost compact instrument through to the multi-channel system in which a DEFECTOMAT channel may also be integrated.
Rotating heads for use on round stock cover the diameter range from 2 to 130 mm.
Typical fields of application include wire drawing machines, copper tube winders or finishing sections in the bright steel sector.
Individual arrays with rotating disks scan flat and profile material, e.g. when testing rails and shot blasted rectangular billets
Circograph Eddy Current Testing Instruments
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CIRCOGRAPH DS 6.430
The top model for eddy-current testing with rotating probes.
The newly introduced instrument system, based on Windows NT, allows convenient operation and uncompromising network integration.
Modern touch screen technology and application wizards simplify dialogue and prompt the operator reliably to ensure the right instrument settings. The system uses the networking capability and multitasking power and performance of Windows NT. Thus, FOERSTER allows access to the test instrument from any number of computer stations simultaneously, even if there are different interests, e.g. current test status, test result of the last job tested or a lot from last month for reasons relating to investigations.


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CIRCOGRAPH CP 6.412
The least-cost version for eddy-current testing with rotating probes.
This single-channel test instrument has all features required for automatic testing, e.g. interfaces for the line-related sensors and actuators for speed, flaw marking and sorting. Printer and computer interfaces allow documentation in the form of a hardcopy report or export of test results and setting data to other computer systems. Together with the space-saving rotating heads Ro 20 or Ro 35L, the CIRCOGRAPH CP is the ideal solution for integration directly in drawing lines and winders.
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Sensor System
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Four rotating heads are used for eddy-current testing with the CIRCOGRAPH for the diameter range 2 to 130 mm. Special solutions with stationary sensors and rotating test material can be implemented for larger diameters.
Maximum test speeds of up to 8 m/s , assuming scanning without omission, are possible, depending on the version of the rotating head, sensor complement and rotational speed.

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Rotating Head Ro 20
Small, compact rotating head for diameters 2 - 20 mm, fitted with 2 test heads of pin design. Together with the motor control MOC E (9,000 rpm), it is possible to achieve a maximum test speed of 1.5 m/s with scanning without omission, with 2 test heads, each with 5 mm track width. A maximum speed of 3 m/s can be implemented with the motor control MOC EV (18,000 rpm).
The Ro 20 can be operated with the CIRCOGRAPH CP (single-channel) or with the CIRCOGRAPH DS (2-channel).

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Rotating Head Ro 35 P and Ro 35 L
The Ro 35 is designed for the diameter range 2 - 35 mm and is available optionally with 4 test heads of pin design (P) or lever design (L). Together with the motor control MOC E (4,500 rpm), it is possible to achieve a maximum test speed of 1.5 m/s, assuming scanning without omission, with 4 test heads, each with a track width of 5 mm. With the motor control MOC S or SB (9,000 rpm), it is possible to achieve a maximum test speed of 3 m/s. On the Ro 35 L, only 2 levers can be used in the case of diameters less than 5 mm, and the maximum test speed is then reduced to half.
The field of application of the Ro 35 P relates to the bright steel sector with polished surfaces for testing bars with good end condition.
The field of application of the Ro 35 L relates more to a drawing line where the condition of the ends may cause difficulties when threading up and exiting. The levers are able to deflect if they come into contact with the material.
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Rotating Head Ro 65
The rugged eddy current rotating head Ro 65 is designed for the diameter range 5 - 65 mm and is available optionally with 2 or 4 test heads of lever design. Together with the motor control MOC E (3,000 rpm), it is possible to achieve a maximum test speed of 4 m/s, assuming scanning without omission, with 4 test heads, each with a track width of 2 x 10 mm.
With the motor control MOC S or SB (6,000 rpm) and the same complement, it is possible to achieve a maximum test speed of 8 m/s. Special versions are available for use on drawing machines with diameters up to 50 mm.
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Rotating Head Ro 130
The rugged eddy current rotating head Ro 130 is designed for the diameter range 5 - 130 mm and is available optionally with 2 or 4 test heads of lever design. Together with the motor control MOC E (1,500 rpm), it is possible to achieve a maximum test speed of 2 m/s, assuming scanning without omission, with 4 test heads, each with a track width of 2 x 10 mm. With the motor control MOC S or SB (3,000 rpm) and the same complement, it is possible to achieve a maximum test speed of 4 m/s.

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CIRCOSCAN
Rotating disks with corresponding actuators are available for scanning profiles (sections) and flat material. Solutions with adapted mechanism are available for rail and rectangular billet testing
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Eddy-current system for testing rails for surface flaws with rotating disks CIRCOSCAN H and shape-adapted segment coils.
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