About the technology

• People fitted with pacemakers or other electronic medical devices should not use magnets. Also, do not bring the magnets near people fitted with such devices.
• Extremely strong attractive forces operate between magnets and iron and other magnetic substances, so take care that hands, feet, and other body parts are not caught between them.
• If magnets are brought near magnetic cards or other magnetic recording media, the data may be damaged and rendered unusable. In addition, be aware that bringing them near computers, electronic watches, and other precision electronic devices may cause these to break down.

Please contact us as follows.

• Email inquiries (accepted 24 hours a day, 365 days a year.)
  senrigan-support@konicaminolta.com

It can measure any type of structure as long as it uses steel materials. We have achieved results with prestressed concrete (pre-tensioned and post-tensioned), stirrups (rebar), dowel bars in concrete deck slabs, and concrete poles, among other items.
Please consult us with regard to other structures.

If the tendons are inserted at an angle or the rebar is arranged in a complicated structure, you should mark the positions of the tendons before measuring. In general, this is often necessary for post-tensioning and often unnecessary for pre-tensioning.

Because SenrigaN draws waveforms with multiple sensors, it is possible to distinguish waveform changes due to the stirrups and waveform changes due to ruptures.
In the diagram below, all sensors reacted to the stirrup, but only some sensors reacted to the rupture location.
However, measurement may be difficult depending on the positional relationship of the tendons and the stirrups.
The diagram below is a waveform in the depth direction (Z-axis) when measuring a pre-tensioned beam using the flux leakage method.

When measuring with SenrigaN, the signal strength depends on the rupture cross-section in the magnetic body being measured. As the cross-section ratio of the sheath piping and the tendons is usually great enough, it is possible to capture ruptures in the internal tendons even with a sheath, as in the diagram below.
The diagram below shows the measurement results with the magnetic stream method with tendons (∅ 28.6 mm, 19-strand wire), sheath piping (internal diameter 40 mm, 0.27 mm thick), tendon covering 10 cm, rupture separation 3 cm, cross-section ratio ∅ 28.6 tendon (468 mm2):sheath piping (41.3 mm2) ≒ 10:1.

Under the best conditions, about 20 centimeters. If there are stirrups and other iron (magnetic bodies), it is about 10 to 15 centimeters. The tendons closest to the surface are measured.
If you have specific conditions in mind, provide the structural information so that we can build a model in our laboratory and determine whether measurement is possible. Feel free to consult us.

If the working environment is good, it is possible to measure about 100 locations in one day. You can measure an area of 16 cm × 53 cm in each location.
If the working environment at the site is poor, such as an elevated work platform or narrow scaffolding, the number may be less.

It is possible to measure with two or three people: one or two for the measuring instrument and magnets, and one for data registration.

[Only for Japan]Our partner companies can conduct testing. Please refer to testing companies that handle SenrigaN on our website.
If you are measuring for research or the like, we handle these cases individually, so please consult us. [for area outside Japan] we do not provide any tesing service.

If this is your first time using our products, we offer training lasting half a day to several days. We provide lectures on how to use the measuring instruments, handling magnets, and how to register and read data, among other topics.