Magnet permeability meter FerroPro compact
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The magnet permeability meter Ferromaster is now replaced by its successor FerroPro compact. |
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Convenient and robust instrument for measuring the relative magnetic permeability µr between 1 and 5
Paramagnetic materials up to permeability µr=5
The List-Magnetik Magnetic Permeability Meter FerroPro compact can be used to determine the relative magnetic permeability µr of materials and components in the range between 1.000 and 5.000.
Low magnetism - permeability and remanence
Magnetic permeability is an indication of how strongly a material can be magnetized. The statement is useful where no magnetism is actually desired, for example with stainless steel.
Magnetic permeability should not be confused with remanence or residual magnetism: Remanence indicates how strongly an object is actually magnetized, while permeability indicates how easily it could be magnetized, i.e. its ability to adapt to a magnetic field.
The permeability μ is the ratio of the magnetic flux density B to the magnetic field strength H.
The relative permeability µr is the quotient of µ and the magnetic field constant μ0.
Why do you need permeability measurement ?
Applications include quality control of stainless steels, non-destructive testing of structural components, material selection for electron/ion physics and nuclear magnetic resonance equipment, and detection of material changes in highly stressed parts.
Calibration standard - an important accessory for the magnet permeability meter
You can check the accuracy of the measurement at any time using the calibration standard supplied with the device. The standard calibration standard has a value of µr ~ 1.35. Additional calibration standards with reference values of µr ~ 1.03 and µr ~1.11 are available.
The instrument is calibrated against precisely calibrated reference standards traceable to the Physikalisch-Technische Bundesanstalt PTB (Braunschweig, Germany). Recalibration is easily possible. A calibration standard is supplied with each instrument. The magnetic permeability of a material is usually strongly dependent on the strength and frequency of the magnetizing field. The probe of the FerroPro compact can be adjusted to different excitation field strengths. FerroPro compact can be used to perform standard-compliant permeability measurements according to ASTM A342 test methods 1 and 4, EN 60404-15 method 6 and VG 95578.
Spot measurement and scan function
FerroPro compact has a graphical LCD touch panel with an innovative user interface and a resolution of 320x480 pixels.
The scan function allows the user to scan the surface of a part and statistically evaluate the data. The additional analog display complements the visualization of measured values, allowing you to see trends and peaks even out of the corner of your eye.
Scan Measurement |
Data logger and Application |
| Do you want to continuously scan a workpiece and determine the minimum and maximum values? The scan measurement provides you with a graphical permeability curve with statistical evaluation. | Do you need to generate a report of the permeability measurement? With the Lima Connect app you can read out the device memory and process and send the data. |
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Interfaces and operation
With flexible data logger, combined digital and analog display, and peak value measurement, the instrument supports all areas of permeability measurement. The Bluetooth interface can be used to transfer data to a Windows PC as well as to the Android or iOS app. The USB-C interface allows the device to be connected to an external power source for continuous operation.
An SCPI interface is implemented, allowing the instrument to perform remote measurements in line operation and to provide measured values. Connection is via USB, which also provides power and continuous operation.
Limits of accuracy in permeability measurement
The measured value of permeability depends on the dimensions of small material samples. The sensitivity of the device increases with the thickness of the material.
From a thickness of about 5 mm and a lateral expansion of about 2 cm, the measurement is independent of the size.
The approximate dependence of the sensitivity on the thickness is shown in the diagram.
The sensitivity is calculated as (µr displayed - 1) / (µr true - 1)
Measuring ranges of permeability meters – Paramagnetism
Magnetic materials can be classified according to their permeability number.
Diamagnetic materials 0 < µr < 1
Paramagnetic materials μr > 1
Ferromagnetic materials μr ≫ 1
Measurements with List-Magnetik permeability meters can only be carried out on paramagnetic materials. For example, aluminum, chromium, platinum and stainless steel are paramagnetic. For stainless steel, the value µr depends on the alloy.
Ferromagnetic materials (iron, nickel, cobalt and various alloys) have a permeability number that is significantly greater than 1 and can assume values of more than 100. Such materials considerably increase the magnetic flux density of a magnetic field. List-Magnetik permeability measuring devices are not designed for this.
A short video tutorial on the use of the device
Ferromaster vs. FerroPro compactMajor advantages over our proven Ferromaster model are the graphical display with many additional features such as scan measurement and analog display. The FerroPro compact offers memory and an interface to Windows PC and mobile devices. The measuring range is up to µr=5. |
FerroPro FP-5 vs. FerroPro compactAdvantages over the laboratory instrument FerroPro FP-5 are the compact design as a handheld instrument as well as additional functions such as scan measurement and analog display. In addition to the Windows interface, the FerroPro compact offers an interface to mobile devices. |
Manage and send measurement data with a free application
To further process your measurement data, you can pair your measuring device with mobile Android and iOS devices. Or you communicate with a Windows PC. This is made possible by Bluetooth Low Energy technology (BLE). With the Lima Connect app you can manage projects and assign the measuring points on a photo. The measurement results can be statistically evaluated and displayed graphically. The app for Android, iOS and Windows is free.
Technical Data Magnet permeability meter FerroPro compact
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| Measuring range: | µr = 1.000 to 5.000 |
| Probe: | FPC-5, interchangeable, with separately interchangeable cable |
| Accuracy at 20°C: | (µr - 1) x 5%, against traceable calibration standards, can be readjusted |
| Resolution: | 0.001 |
| Ambient temperature range | 0 - 50° C |
| Display: | LCD color touch panel 320x480 pixels |
| Temperature range: | 0 to 50 °C |
| Multilingual menu: | English, French, German, Italian, Spanish |
| Data logger: | 10,000 measurements, flexibly divisible |
| Interface: | Bluetooth Low Energy interface to communicate with Android, iOS and Windows |
| App for Android, iOS, Windows: | free via Google Play Store, Apple App Store, List-Magnetik homepage |
| External control: | via USB-C and SCPI communication interface |
| Power supply: | 3x 1.5V AA Mignon. External power supply connectable via USB-C |
| Operating time: | Approximately 25 hours with battery, unlimited with external power source. |
| Dimensions: | 150 x 85 x 35 mm |
| Weight: | 320 g with batteries |
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Models and scope of delivery Magnet permeability meter FerroPro compact
| FerroPro compact with measuring probe FPC-5, calibration standard (~1.35), probe cable, USB Bluetooth receiver and case, including calibration certificate |  |
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