Dual Magnetic Susceptibility Probe HMM-453
The HMM-453 probe is designed for measurement of magnetic susceptibility of rocks in borehole profile. First channel of is used for measurement in complex of sedimentary rocks, igneous or metamorphic rocks up to low magnetite rocks. The susceptibility is an excellent indicator of lithology.
Second channel is designed for measurement in complex of igneous or metamorphic rocks up to high magnetite rocks. The measuring range has been chosen so as to identify layers containing magnetite (0.005 – 100%). The main use of the probe is for prospection on deposits of Fe minerals – magnetite, pyrrhotite and hematite. The data are to be used for quantitative interpretation of the magnetic components in the rocks and estimation of the thickness of layers. The data can directly be used for economic evaluation of the deposit.
In a complex of sedimentary rocks the probe provide informative data only.
The probes response is practically instantaneous (<0.5s).
Probe Parameters
| Diameter | 45 mm |
| Length | 125 cm |
| Weight | 4.5 kg |
| Max. Working Temperature/Pressure | 75°C/20 MPa |
| Min. No. of Cable Conductors | 2 |
| Supply Voltage Range | 30 – 45 VDC |
| Max./Nominal Current Consumption | 100/40 mADC |
| Supply Voltage Polarity | + on central cond. |
| − on probe casing |
Measuring Parameters
| Sensor | four coil system |
| Intercoil Spacing 1. channel | 20 cm |
| Intercoil Spacing 2. channel | 30 cm |
| Operating Frequency | ≈2 kHz |
| Communication (negative pulse) | 0 – 20 000 cps |
| Measuring range | 10−5 – 0.2 SI units |
| 10−4 – 2 SI units | |
| Accuracy | < 3% F.S. |
| Zero Drift | < 2.10−5 SI units/10°C |
| < 1.10−4 SI units/10°C |
Special orders
Probes of diameters 32 and 38 mm can also be manufactured upon special order. Their measuring parameters are similar to those stated above.