Magnetic Material Analyzer
q The MagCorr provides a rapid determination of magnetic material content of a sample without resorting to expensive and time-consuming X-ray diffraction, wet chemistry, or weight/volume determinations.
q The MagCorr can accommodate multiple calibration curves, and it can be either factory calibrated, or field calibrated by the user.
q The MagCorr can operate in a stand-alone mode, or be connected to a user’s computer or network for data transfer of multiple readings.
q The MagCorr is designed to take advantage of current digital processing technology. This provides maximum readout stability at all times and the greatest possible accuracy and resolution for every sample processed. Accuracy is +/- 1%, and repeatability is <+/- 0.2% depending on sample preparation.
q The MagCorr works on the principle of magnetic coupling. The sample acts as the core of a specially designed sample transformer. A calculated voltage is applied to the primary winding of the sample transformer, and the subsequent secondary voltage induced through the sample is measured, then converted to a value representing % Magnetic Material.
Rapid Magnetic Material Determination (~ 30 seconds
Laboratory Grade Accuracy (+/1% Accuracy; +/-
0.2% Repeatability ) §
User Defined Calibration Curves (Can Accommodate 20 +
Crushed (- 200 mesh
)or Solid Samples §
Rugged Construction – Operates on 90 to 230
VAC; 50 – 60 Hz §
Lightweight (~7# )–Can be easily carried to
any field site §
Digital Computer Interface
§ Rapid Magnetic Material Determination (~ 30 seconds )
§ Laboratory Grade Accuracy (+/1% Accuracy; +/- 0.2% Repeatability )
§ User Defined Calibration Curves (Can Accommodate 20 + Curves)
§ Crushed (- 200 mesh )or Solid Samples
§ Rugged Construction – Operates on 90 to 230 VAC; 50 – 60 Hz
§ Lightweight (~7# )–Can be easily carried to any field site
§ Digital Computer Interface
Sample Presentation: Either a solid or powdered sample is placed in the sample holder, and an immediate analysis is available. Once setup, there are no adjustments or settings to be changed, the analysis is instantaneous.
Analyzer Setup: The MagCorr has a user-friendly operating menu with selections for compaction, analysis, calibration, trends, and data collection & storage. The analyses data and the calibration curves used to calculate those data are available for user computer access.
Method of Analysis: The MagCorr works on the principle of magnetic coupling through the sample. The sample acts as the core of a specially designed sample transformer. A known signal voltage is applied to the primary winding of the sample transformer, and the subsequent secondary voltage induced through the sample is measured. The measured value is converted to digital form and stored in the instrument as the "raw count" value. This value is then converted to % Magnetite based on the calibration equation selected.
Processing Electronics: The MagCorr utilizes state of the art electronics and touch screen technology. It is a digital device designed to take advantage of current digital processing techniques to provide maximum readout stability at all times and also the greatest possible accuracy and resolution for every sample processed. Each MagCorr is calibrated for its own unique characteristics, as well as the characteristics of the customer’s Magnetic Material samples.
Calibration: Third order polynomial calibration equations of the form A + BX + CX2 + DX3 are the basic calibration equations utilized in the MagCorr. Other calibration equations can be entered by the user. A calibration curve normally provided is based on manufactured samples; this is used for initial setup of a MagCorr. After initial setup, a curve fit is calculated from customer data (obtained from customer samples) and entered into the memory of the MagCorr. Multiple calibration curves can be supplied based on customer-supplied samples. This approach provides the versatility to enable a single MagCorr to be used for multiple material types. Sample analysis is a rapid procedure once calibration of the unit has been initially made. However consistent sample collection and preparation are essential to accuracy and repeatability.
Factors Affecting Accuracy: Each of the following factors will affect the accuracy and repeatability of the analysis:
1 Consistency of sample size for solid samples.
2 Particle size of the material in crushed samples affects packing density and non-linearly affects the measurement.
3 Sample compaction also affects packing density, and will indirectly affect the measurement.
4 Mineralogy affects the measurement; this is particularly true of the varying presence of multiple iron compounds.
5 When working with slag samples, the cooling practice used in preparing the sample will directly affect the reading.
6 In all situations, if consistent sample preparation practices are followed, then consistent results can be expected.
Sample preparation: Sample preparation is the most time consuming and critical part of an analysis. For the MagCorr, recommended sample preparation of crushed samples consists of crushing, grinding, and screening. Although each sample preparation step is critical and requires consistency, for coarser samples, sample compaction is one of the most critical steps in the process. To provide consistency of analyses, compaction must be done the same way on every sample. For this reason the MagCorr can be provided with an integral sample compactor designed to provide consistent sample compaction.
Digital Interface: The MagCorr now has a digital interface that allows complete monitoring of all measurements from a local computer, or over a network. All the information from the MagCorr can be reviewed, and calibrations can be checked and changed if desired either locally or remotely. Every time a new reading is made, an alert can be received and information added to spreadsheets or operations personnel notified. New calibrations can be tested and equations can be altered or fortified based on instantaneous readings.
Copyright 2000, Harrison R. Cooper Systems, All Rights Reserved