AGICO MFK2 Kappabridges
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Magnetic Susceptibility/Anisotropy Systems
Manufactured in the Czech Republic by AGICO s.r.o.
MFK2 Data Sheet
MFK2 Manual
How to Select a Kappabridge
Accessories & Spare Parts
Magnetic Susceptibility/Anisotropy Systems
Manufactured in the Czech Republic by AGICO s.r.o.
THREE FREQUENCY KAPPABRIDGES FOR MEASUREMENTS OF MAGNETIC SUSCEPTIBILITY
- ANISOTROPY
- FREQUENCY VARIATIONS
- FIELD VARIATIONS
- TEMPERATURE VARIATIONS
General DescriptionMFK2 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.
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)
MKF2-FA Kappabridge
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 Kappabridge
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.
| Technical Specifications: | |
| Operating frequencies | 976 Hz 3904 Hz 15616 Hz |
|
Field intensity ranges Frequency 976 Hz Frequency 3904 Hz Frequency 15616 Hz |
2 – 700 A/m (peak) 2 – 350 A/m (peak) 2 – 200 A/m (peak) |
|
Sensitivity 976 Hz, 400 A/m peak 3904 Hz, 200 A/m peak 15616 Hz, 200 A/m peak |
2 x 10-8 SI (400 A/m) 6 x 10-8 SI (200 A/m) 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 |
Available accessories for the MFK2 include:
3D Rotator
3D-Rotator brings increased speed and better comfort of anisotropy of magnetic susceptibility measurements. The 3D-Rotator rotates the specimen simultaneously about two axes with different velocities. The 2-axis rotation enables to de termine 320 directional susceptibilities during a single anisotropy measurement. These directions are very well distributed on a sphere which makes the measuring design almost rotatable. The actual measurement is fully automated in such a way that, once the specimen is mounted into the rotator, it requires no additional manipulation to measure the full AMS tensor. The approximate duration of one anisotropy measurement including bulk susceptibility is 1.5 min, compared to more than 3 minutes when the classical (3-plane) rotator is used.
Main Features:
- Rapid anisotropy measurements with full autoranging
- One specimen in less than 2 minutes
- Specimen inserted only once
- One manual handling minimizes specimen misorientation
- Automated AMS measurement in variable fields
- Bulk susceptibility automatically measured right after anisotropy measurement
- Anisotropy tensor automatically calculated from 640 directional susceptibilities
- Sophisticated software support
- For MFK2-FA/A and KLY5-A Kappabridges
Specimens to be measured:
Cylinder (regularly shaped specimens)
Diameter: 25.4 ± 1 mm
Length: 22.0 ± 1 mm
CS-4 Furnace Apparatus
The CS4 High Temperature Furnace Apparatus is optional attachment for KLY5-A, MFK2-FA and MFK1-FA/A Kappabridges designed for measurement of the temperature variations of low-field magnetic susceptibility of minerals, rocks and synthetic materials in the temperature range from ambient temperature to 700°C. Measurements can be performed under the protective argon atmosphere to prevent oxidation of measured specimen.The quasicontinuous measurement process is fully automated, being controlled by the software Sufyte5. Data processing software Cureval serves for advanced analysis of thermomagnetic curves such as empty furnace measurement substraction, Curie temperature estimation and separation of ferromagnetic and paramagnetic part of susceptibility.
Main Features:
- Lowest detectable susceptibility change 1×10-7SI
- Measurement at high temperatures up to 700° C
- Software controlled heating and cooling modes
- Measurement in the air or argon atmosphere
- 500 to 700 pairs of susceptibility and temperature measurements to define a thermomagnetic curve
Technical Specifications:
| Nominal specimen volume (powder or fragments) | 0.25 cm3 |
| Inner diameter of measuring vessel | 6 mm |
| Temperature range | room temperature up to 700°C |
| Accuracy of temperature determination | ±2 °C |
| Sensitivity to susceptibility changes | 1×10-7 SI |
| Power requirements | 100 – 240 V, 50/60 Hz, 700 VA |
CS-L Low Temperature Cryostat Apparatus
The CSL Low Temperature Cryostat Apparatus is optional attachment for KLY5-A, MFK2-FA and MFK1-FA/AKappabridges designed for measurement of the temperature variation of low-field magnetic susceptibility of minerals, rocks and synthetic materials in the temperature range from -192°C to ambient temperature.The specimen is placed in a measuring vessel which is cooled inside the cryostat by liquid nitrogen and then heated spontaneously to a given temperature. The argon gas is needed for deplenishing the liquid nitrogen out of cryostat.The quasi-continuous measurement process is fully automated, being controlled by the software Sufyte5. Data processing software Cureval serves for advanced analysis of thermomagnetic curves such as empty furnace measurement substraction, Curie temperature estimation and separation of ferromagnetic and paramagnetic part of susceptibility.
Main Features:
- Lowest detectable susceptibility change 1×10-7 SI
- Measurement at low temperatures from -192° C
- Cooled by liquid nitrogen
- Estimation of ratio between ferromagnetic and paramagnetic part of susceptibility
Technical Specifications:
| Nominal specimen volume (powder or fragments) | 0.25 cm3 |
| Inner diameter of measuring vessel | 6 mm |
| Temperature range | -192°C – 0°C |
| Accuracy of temperature determination | ±2 °C |
| Sensitivity to susceptibility changes | 1×10-7 SI |
| Power requirements | 100 – 240 V, 50/60 Hz, 700 VA |
Kappabridge Comparisons
How to Select a Kappabridge
| 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 |