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BARTINGTON INSTRUMENTS

Page 10 of 82 OM0408/49

The sensors can be broadly divided into laboratory and field survey sensors:

Type

Sensor

Purpose

Laboratory
sensors

MS2B

Measurement of magnetic susceptibility of soil, rock and
sediment samples.

MS2C

High resolution volume susceptibility measurements on
whole cores.

MS2E

Measurements with high spatial resolution along split cores
or suitably prepared geological specimens.

MS2G

Measurements of powder or liquid samples.

MS2W

Measuring temperature dependency of magnetic
susceptibility.

Field
survey
equipment

MS2D

Assessment of the concentration of ferromagnetic materials
in the top 100mm of the land surface.

MS2F

Stratigraphic study of exposed geological and
archaeological sections.

MS2H

Down-hole sensor for sub-surface measurements of
volume magnetic susceptibility of strata.

MS2K

Highly repeatable measurements of the volume magnetic
susceptibility of moderately smooth surfaces.

The full range, specifications and functions of the sensors available for use with the MS2 meter
are given in the product brochure.

4.3. Operating Environment Considerations

The following environmental factors should be taken into account when using the MS2 system.

4.4.1. Temperature Induced Drift

The MS2 sensors operate on the principle of comparison between the magnetic permeability
of air and the relative permeablility obtained with the contribution of the sample magnetic
permeability. In order to do this the sensors are required to measure the magnetic permeability
to a high resolution. This can be a very demanding requirement as any change in temperature
can lead to a slight distortion of the coil shape, causing an apparent change in permeability, and
therefore in susceptibility.

Each sensor employs its own technique for temperature compensation to minimise any
temperature induced drift. A facility for automatic correction of temperature drift at the end of a
measurement sequence is also provided by the Multisus and Bartsoft software packages. This
drift correction is worked out by taking a zero (or blank) reading at the start, and then taking a
second blank reading (not a zero) after the sample measurement.

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Содержание MS2

Страница 1: ...Operation Manual for MS2 Magnetic Susceptibility System...

Страница 2: ...ations 10 4 4 Software 11 4 5 SI and CGS units 12 4 6 Range Selection 12 4 7 Calibration 12 5 MS2 Meter 13 5 1 Front Panel Controls 13 5 2 MS2 Meter Rear Panel 14 5 3 Rear Panel 14 5 4 Connecting a Se...

Страница 3: ...olution Surface Scanning Sensor 30 8 1 General Description 30 8 2 Characteristics 30 8 3 Operating Instructions 33 8 4 Care of Sensor 34 9 MS2 Probe Handle for Use with Probes Type MS2D and MS2F 35 9...

Страница 4: ...S2 MS3 Susceptibility Temperature System Cables 51 16 MS2W Water Jacketed Sensor 52 16 1 Calibration Note 53 17 MS2WF Furnace Sensor 53 17 1 Operation 54 17 2 Construction 55 17 3 Pt Pt Rh type S ther...

Страница 5: ...ration 71 21 2 Large Variations in Measured Values 71 21 3 Serial Communications Problems 71 22 Storage and Transport 72 23 Disposal 73 23 1 Waste Electrical and Electronic Equipment WEEE Regulations...

Страница 6: ...nning sensor 49 Figure 18 MS2K Depth Response 51 Figure 19 MS2W water jacketed sensor 54 Figure 20 MS2WF furnace sensor 55 Figure 21 MS2WFP power supply temperature controller 60 Figure 22 Susceptibil...

Страница 7: ...ituation in which serious bodily injury or death could result if the warning is ignored Caution Indicates a situation in which bodily injury or damage to your instrument or both could result if the ca...

Страница 8: ...gh resolution surface scanning sensor MS2 handle for use with probes type MS2D and MS2F MS2D probe MS2F probe MS2G single frequency sensor MS2H down hole probe MS2K high stability surface scanning sen...

Страница 9: ...permeability of its core is changed The reference state is measured when the sensor contains only air the permeability of air is approximated as the permeability of a vacuum Taking a reading with a s...

Страница 10: ...of the sensors available for use with the MS2 meter are given in the product brochure 4 3 Operating Environment Considerations The following environmental factors should be taken into account when usi...

Страница 11: ...he normal sensitivity x1 0 range With no sample present first press the Z button and then select continuous measurements on the M toggle switch If fluctuations of greater than 1 least significant digi...

Страница 12: ...below shows the the exponent value of the least significant digit i e the last digit on the LCD for each range The units in the table below for volume susceptibility Exponent values for least signifi...

Страница 13: ...button but permits continuous measurements 3 Zero push button labelled Z permits air readings to be taken By performing a measurement to air this control re sets the instrument and brings subsequent m...

Страница 14: ...n be inserted here and connected to a computer to allow control and communication using Bartsoft or Multisus software For more information see Serial Interface 3 Three way rotary Switch allows the use...

Страница 15: ...of the current measurement period This is announced with a beep At this time serial data will be transmitted 3 If either push button is enabled at the completion of a cycle then a repeat measurement...

Страница 16: ...nding the ASCII character Z Zero or M Measure to the MS2 from the computer To zero the instrument once therefore it is necessary to send Z followed by carriage return Sending M followed by carriage re...

Страница 17: ...e full capacity of the batteries it is necessary to completely discharge and recharge them not more than every six months 5 6 1 Battery Charging Laboratory Use When the instrument is switched on and c...

Страница 18: ...ure 2 1 NiMH battery pack 2 Two way connector 3 Earth lead to earth point in the upper enclosure For MS2 meters purchased prior to 1st January 2006 scrape away the wax coating over the four slotted nu...

Страница 19: ...ies the connection is via a two way connector On older units the connection is via a terminal block with screw terminals The terminal block forms part of the battery assembly and must be removed with...

Страница 20: ...ay D type connector is provided The baud rate and bit format are set by a rotary switch on the rear panel as follows A Standard serial interface Baud rate 1200 Bits per character 1 start 7 data 2 stop...

Страница 21: ...Rx Pin 1 Pin 5 COMMON Pin 4 and 6 RTS CTS Pin 7 and 8 DSR DTR 5 9 Power Supply Accessories The following accessories are supplied with the equipment Fully isolated 240V or 110V to 12V DC 2 1mm centre...

Страница 22: ...into the sample cavity The sample containers accommodated by this sensor are those commonly in use in most palaeomagnetic and mineral magnetic laboratories thus measurements of NRM natural remanent ma...

Страница 23: ...e the higher value cFD 100 x cLF cHF cLF where the frequencies used for LF and HF are in the ratio 1 10 The frequencies used by the MS2B sensor are given in the product brochure The LF frequency is ca...

Страница 24: ...on sample can sometimes be difficult to remove The magnetic susceptibility value is marked on the sample This material exhibits a negligible frequency dependency and may be used to check the sensor ac...

Страница 25: ...ous laboratory after treatment 2 Samples can safely be dried in air at temperatures up to 40o C to reduce the mass contribution of water 3 The sensor is calibrated to a secondary standard derived from...

Страница 26: ...using this sensor For dry materials and for materials of unknown density this provides the most useful measurement because simple weighing of the material is all that is required Where sample mass de...

Страница 27: ...errors arising from its diamagnetism 6 8 2 Selecting the Measuring Range Choose one or two samples from the batch to be measured and obtain if possible the typical batch susceptibility value using th...

Страница 28: ...in the product brochure The MS2C is designed for volume susceptibility measurements of sediment peat or soil cores made in plastic Perspex or similar non magnetic tubes trays or liners The high spatia...

Страница 29: ...f the sensor over time has been shown to exceed that of any core material which might be used routinely to check the calibration Therefore the core should be used only to identify when some catastroph...

Страница 30: ...ld therefore be aware of the sensor orientation denoted by two black marks on either side of the tube The MS2E sensor is designed to perform high resolution measurements of magnetic susceptibility alo...

Страница 31: ...imum FWHM response to be circa 11 5mm with the long sensing axis perpendicular to the stratigraphy and circa 3 8mm with the long sensing axis parallel to the stratigraphy 2 Depth response normal to th...

Страница 32: ...refer to MS2B Dual Frequency Sensor A calibration sample is provided and should be used periodically to check that the sensor is working correctly Note Never expose the calibration sample to high magn...

Страница 33: ...for the measurements Note Measurements of cores should only be performed on a non conducting surface such as a wooden bench Although the sensor takes measurements only in the vicinity of the probe sur...

Страница 34: ...int and take a second measurement Check the baseline drift by performing a measurement to air If the drift level is unacceptable then further time for temperature equilibration should be allowed Five...

Страница 35: ...ype MS2D and MS2F Figure 11 MS2 probe handle for use with probes type MS2D and MS2F Key to Figure 11 1 MS2 meter 2 TNC coaxial cable 3 Probe 4 Lower extension tube 5 Upper section with handle 6 Electr...

Страница 36: ...land and a replacement part fitted The handle is submersible in water up to the electronics unit 0 6 metres Extension tubes can be provided for a limited increase in length Caution Probe types MS2D an...

Страница 37: ...vegetation or variable thickness of organic leaf litter limits the accuracy of the MS2D probe The MS2F probe may be more appropriate for these conditions 10 2 Calibration Notes This sensor is calibra...

Страница 38: ...Unit 1 Inspect the O ring seals on the handle and extension tube to ensure that they are in contact 2 Correct connections are clearly marked on the electronics unit Accidental direct connection of a...

Страница 39: ...nut 12 1 General Description The MS2G sensor type is intended for use with a 1cc volume sample vial It comprises a metal enclosure containing the electronic circuitry at the end of which is mounted a...

Страница 40: ...ng screw located below the cavity to achieve the same sample position for when the sample is within the cavity Tighten the locking nut The adjustment mechanism may be removed by undoing the brass reta...

Страница 41: ...this step is especially important when using the x0 1 range Check that the sensor is functioning correctly by performing a calibration check using the 1cc check sample located on the side of the senso...

Страница 42: ...ny hole diameter from 22mm to 25 4mm See Table 4 below for scaling factors The sensor consists of a probe head attached to a tube which is lowered into the test hole The head and tube are graduated to...

Страница 43: ...nsion tube 3 Connect the probe head to the short extension tube by screwing together Note To avoid twisting the cable whilst doing this or when adding extra tubes hold the probe head still and only ro...

Страница 44: ...ts and compensate for any drift during the measurement run Note If the Multisus or Bartsoft PC softwares are being used then the readings can be corrected automatically to include drift compensation a...

Страница 45: ...Readings can also be taken as the probe is extracted from the hole 9 Click on Apply Corrections You will be prompted to remove the probe from the hole clean it and perform another air zero reading The...

Страница 46: ...e clean it and perform a final reading in air Record this reading as the end of measurement zero drift For best accuracy results you should now calculate a drift correction for each reading assuming t...

Страница 47: ...ximate value of cvol can be obtained by multiplying the displayed reading by the scale factor in Table 4 Table 4 Scaling factors for cvol Hole diameter mm Scale factor for cvol 23 0 1 000 24 0 1 418 2...

Страница 48: ...The sensor is housed in a lightweight enclosure and is fitted with a pistol grip The active region of the sensor is 25mm in diameter at the tip of a cylinder and is protected by a wear resistant ceram...

Страница 49: ...for Fe the high value of mr 500 accounts for the significantly low value of S as does the low resistivity of Cu and Ag 14 2 3 Calibration The sensor is calibrated to read true volume susceptibility wh...

Страница 50: ...MS2K depth response When the zero period is completed the sensor can be gently placed against the surface to be measured and the M button pressed Move on to the next point and take a second measuremen...

Страница 51: ...uter supplied by the user with an RS 232 serial port running the GeoLab for Windows software Software is supplied with the system for plotting the results in real time This equipment can be used to pe...

Страница 52: ...but will be vertically orientated when used in conjunction with the furnace The probe is calibrated to accept a 10cc sample The operating frequency of 696Hz is chosen to be sufficiently low so that m...

Страница 53: ...e fitted in the water outlet from the sensor WARNING If low temperature measurements are made as suggested using liquid nitrogen the operator must take the necessary precautions involved with using li...

Страница 54: ...uter interfacing The panel meter has an RS485 interface and this is converted to RS 232 within the furnace unit WARNING The thermocouples are not electrically isolated and must not be connected to gro...

Страница 55: ...mended sample size to obtain uniform heating is 15mm diameter x 15mm length 17 3 Pt Pt Rh type S thermocouple This is housed in a 4mm x 160mm mullite sheath which can be clamped using a 3mm diameter l...

Страница 56: ...n the binder material in the insulation is burnt off and produces unpleasant fumes Some samples may also produce fumes during heating Ensure good ventilation is provided at all times and avoid breathi...

Страница 57: ...heating the furnace to 800o C WARNING When using aluminium foil do not allow it to come into contact with the threaded brass support rods which carry current to the furnace 3 Carefully remove the foi...

Страница 58: ...ter 5 Water pump flowmeter sockets 10 Control switches This unit performs two basic functions 1 Thermostatic power control of the MS2WF furnace It supplies electrical power to the furnace and provides...

Страница 59: ...easured to minimise over and undershoot which could occur when selecting a new temperature Maximum current is limited to 4A cold furnace by a safe operating area monitor The platinum furnace s high po...

Страница 60: ...sceptibility temperature system Key to Figure 22 1 MS2WFP 7 MS2WF furnace 2 AC line 240 110V 8 MS2 meter 3 Water pump 9 Computer 4 Sample 10 GeoLab software 5 MS2W 11 Cables 6 Clamp 12 Water pipe Note...

Страница 61: ...ectric motors Figure 23 shows the equipment layed out in close formation from the left MS2 3 Meter MS2WF Furnace MS2W sensor MS2WFP Power Supply Figure 23 X T Equipment Plug in the mains supply Connec...

Страница 62: ...10 Main earth point Before connecting to a mains electricity supply check that the MS2WFP power supply is set to the required AC supply voltage The voltage selection is performed using the voltage se...

Страница 63: ...a reservoir and pump should normally be used However in an emergency the water supply can be derived from the relatively cool sub surface mains supply Connect the inlet flow from the water pump to th...

Страница 64: ...utlet pipe Note The water pump may need to be primed when the system is initially set up Before connecting to the MS2W lower 6mm nipple immerse the pump in the reservoir and suck water from the reserv...

Страница 65: ...ature is displayed after about 10 seconds The temperature will only be correct if the thermocouple type selected by the switch is the same as the thermocouple selected during the last GeoLab run The t...

Страница 66: ...commencing readings but the sensor clamp should be checked to ensure that no movement of the sensor can occur Similarly the probe connecting cable should not be disturbed when measurements are being...

Страница 67: ...ucible has been placed the thermal plug should then be inserted on top prior to heating Figure 32 shows a photograph of what how it should look prior to heating Figure 32 Plug inserted above crucible...

Страница 68: ...o lack of water or a restriction in the pipework then the current to the furnace will be interrupted and no heating will occur A warning beep will sound if the water pump is switched on but no flow is...

Страница 69: ...which the controller is used other than to avoid pre setting a cold furnace to a high temperature and thereby subjecting it to high in rush current and thermal shock If rapid heating is required obser...

Страница 70: ...increments as the temperature increases During this operation the sensor aperture can be horizontal or vertical whichever is more convenient Figure 35 Connection for T type Thermocouple Note The sens...

Страница 71: ...s adaptor connected Replace battery 21 3 Serial Communications Problems If problems are experienced with serial RS 232 communications between the MS2 meter and a PC running Multisus2 or GeoLab check t...

Страница 72: ...lied with a single cable from the MS2 meter to a 9 pin D type RS 232 connector for direct connection to a computer or RS 232 to USB adaptor Earlier meters will have a cable with a 25 pin connector a 2...

Страница 73: ...Disposal This product should not be disposed of in domestic or municipal waste For information about disposing of this product safely check local regulations for disposal of electrical electronic prod...

Страница 74: ...Susceptibility of Common Rocks Figure A1 1 Magnetic susceptibility of common rocks 10 1 0 1 10 2 002 10 3 10 4 10 5 10 6 10 7 Susceptibility CGS units Magnetite Timenites Hematites Limonites Iron carb...

Страница 75: ...m The figure shows the variation in the calibration value of cvol for varying core diameter d for a long core length l greater than 2D The measured value will be equal to cvol when d D 0 66 For other...

Страница 76: ...of stratum diameter d 0 85D Both graphs present the variable of interest in relation to coil diameter D 8mm greater than the nominal diameter of the aperture For a period of core length l 0 25D the en...

Страница 77: ...n of the AMS Adapter To use the AMS adapter the tall sample platen must be removed from the MS2B and replaced with the short one supplied with the AMSWIN BAR kit The MS2B platen height must then be ad...

Страница 78: ...ing and tightening the retaining screw Figure A3 1e f Changing the MS2B platen 3 Refer to Appendix 4 to re adjust the Platen height in order to centre the sample within the aperture Sample adaptors ar...

Страница 79: ...e miniature screwdriver 2 Connect the MS2 meter to the MS2B switch ON and perform a zero Figure A3 1g h Changing the MS2B platen 3 Insert the screwdriver into the adjustment screw Position the sample...

Страница 80: ...e will cause a change to the inductance of a wound inductor The sensors operate on the principle of AC induction Power is supplied to the oscillator circuit within the sensor generating a low intensit...

Страница 81: ...BARTINGTON INSTRUMENTS Page 81 of 82 OM0408 49 Notes...

Страница 82: ...a Brazil Canada China European Union India Japan Norway and the United States of America Bartington Instruments Limited 5 Thorney Leys Business Park Witney Oxford OX28 4GE England www bartington com T...

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