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LABORATORY INSTRUMENTS FOR MEASUREMENTS
OF MAGNETIC PROPERTIES OF ROCKS

MFK2

THREE FREQUENCY KAPPABRIDGES FOR MEASUREMENTS OF MAGNETIC SUSCEPTIBILITY


  • ANISOTROPY
  • FREQUENCY VARIATIONS
  • FIELD VARIATIONS
  • TEMPERATURE VARIATIONS
mfk

General description

MFK2 series of Kappabridges are the updated versions of the advanced Multifunction Kappabridges MFK1. These are the world's most sensitive commercially available laboratory instruments for measuring anisotropy of magnetic susceptibility (AMS) and bulk magnetic susceptibility in weak variable magnetic fields (field range from 2 A/m to 700 A/m, peak values). Besides the in-phase bulk susceptibility, relative changes of the phase angle can be measured. The MFK2-FA and MFK2-FB models are capable to measure, besides at the basic frequency of 976 Hz, also at two additional frequencies of 3904 Hz and 15616 Hz.

Updated electronic circuits, redesigned measuring coils and enhanced firmware and software bring better reproducibility of the results, improved mesurements of the field and frequency variations of magnetic susceptibility and refinement of the relative changes of the out-of-phase component of magnetic susceptibility measurements.

Spinning specimen method uses 3D rotator or classic rotator for easy, rapid and precise AMS measurements. Automatic routines for investigation field variations of AMS as well as bulk susceptibility are incorporated for better user comfort. Optional attachment CS4 and CS-L enables measurements of temperature variation of bulk susceptibility from -192°C up to 700°C.

Versions

MFK2-FA

Three frequency Kappabridge fully equipped with special Up/Down mechanism and rotator for spinning specimen method of AMS measurements. Automatic measurements of field variations of bulk susceptibility. Full support of CS4 and CS-L apparatuses is present as well.

MFK2-FB

Basic version of three frequency Kappabridge for manual measurements of AMS, bulk susceptibility and field variations of magnetic susceptibility without Up/Down mechanism, rotator and CS4 or CS-L support. To faciliate AMS measurements magnetic susceptibility must be manually measured in 15 different orientations. Can be upgraded to MFK2-FA version, but such upgrade has to be done in AGICO facility.

Software

Data acquisition software Safyr controls all particular functions of the Kappabridges, calculate results of individual measurements as well as advanced statistics on measured data. Standard visualisation of the results is also incorporated. For more in-depth analysis of AMS AGICO provides Anisoft - advanced software for processing of AMS datasets.

Main features

High sensitivity 2 x 10-8 (SI)
Fully automatic zeroing system
Three operating frequencies
Field variations of magnetic susceptibility
Rapid AMS measuring (MFK2-FA)
Autoranging
Built-in circuitry for controlling optional CS4 Furnace and CS-L Cryostat
Advanced diagnostics
Sophisticated software support
Optionally 3D rotator (MFK2-FA)

Technical specifications

Operating frequencies 976 Hz
3904 Hz
15616 Hz
Field intensity ranges
     Frequency 976 Hz 2 - 700 A/m (peak)
     Frequency 3904 Hz 2 - 350 A/m (peak)
     Frequency 15616 Hz 2 - 200 A/m (peak)
Sensitivity
     976 Hz, 400 A/m peak 2 x 10-8 SI (400 A/m)
     3904 Hz, 200 A/m peak 6 x 10-8 SI (200 A/m)
     15616 Hz, 200 A/m peak 12 x 10-8SI (200 A/m)
Field homogeneity at 976 Hz 0.5 %
Measuring range up to 0.5 (SI) at 976 Hz
Accuracy within one range ±0.1 %
Accuracy of absolute calibration ±3 %
Pick-up coil inner diameter 43 mm
Power requirements 100, 120, 230, 240 V, 50/60 Hz, 40 VA

Specimens to be measured

For spinning method
Cylinder (regularly shaped specimens)
     Diameter 25.4 ± 1 mm
     Length 22.0 ± 1 mm
Cube 20x20x20 mm
For static method as for spinning method plus
Cube 23x23x23 mm
ODP type 26x25x19.5 mm
Fragments up to 40 cm3 for bulk susceptibility
 


Kappabridges versions comparison

Kappabrige comparison in more detail can be found here.



MFK2-FA MFK2-FB KLY5-A KLY5-B
Bulk susceptibility
Anisotropy of magnetic susceptibility
automatic

manual

automatic

manual
Field variations of bulk susceptibility
automatic

manual

automatic

manual
Field variations of anisotropy of susceptibility
automatic with 3D Rotator

manual

automatic with 3D Rotator

manual
Frequency variations of bulk susceptibility
Frequency variations of anisotropy of susceptibility
semi-automatic

manual
High-temperature variations of bulk susceptibility
in combination with CS4

in combination with CS4
Low-temperature variations of bulk susceptibility
in combination with CS4 and CS-L

in combination with CS4 and CS-L
Absolute out-of phase susceptibility
Relative changes out-of phase susceptibility
lower precision

lower precision

higher precision

higher precision

 

AGICO, Inc, Brno, Czech Republic

ROCK MAGNETISM MEASUREMENTS WITH TRADITION

Last update >>> 10/2017