Bartington Mag670 Series User manual

www.bartington.com
INNOVATION IN MAGNETICS
Telephone: [phone] •Fax: [phone] •Email: [e-mail] •Website: www.bartington.com
Bartington Instruments Ltd
5, 8, 10, 11 & 12 Thorney Leys Business Park
Witney, Oxford, OX28 4GE. England
®The copyright of this document is the property of Bartington Instruments Ltd.
Bartington is a registered trademark of Bartington Instruments Limited in the following countries: Australia, Brazil, Canada, China, European Union, India,
Israel, Japan, Mexico, New Zealand, Norway, Russia, Singapore, South Korea, Switzerland, Turkey, United Kingdom, United States of America and Vietnam.
Operation Manual for
Mag670 Single Axis Magnetic Field
Sensor
OM-2497/5

BARTINGTON INSTRUMENTS
Page 2 of 9 OM2497/4
Table of Contents
1. About this Manual 3
1.1. Symbols Glossary 3
2. Safe Use 3
3. Introduction to the Mag670 4
4. Installing the Mag670 4
4.1. Siting the Sensor (Environment Recommendations) 4
4.2. Cable Recommendations 4
4.3. Pre-Installation Tests 5
4.4. Mounting Recommendations 5
4.5. Post Installation Testing 6
5. Using the Mag670 6
5.1. Magnetic Hysteresis 6
5.2. Environmental Precautions 6
6. Troubleshooting 7
7. Care and Maintenance 7
7.1. Cleaning Mag670 Sensors 7
7.2. Calibration 8
8. End of Life Disposal 8
8.1. Waste Electrical and Electronic Equipment (WEEE) Regulations 8

BARTINGTON INSTRUMENTS
Page 3 of 9 OM2497/4
1. About this Manual
This manual provides the information necessary to help customers connect, install and operate,
the Mag670 magnetic field sensor.
Technical specifications of the products, including power supply requirements and analogue
output details, can be found in DS2497, whilst outline drawings of both sensor head, electronics
board and cable can be found on DR2545.
1.1. Symbols Glossary
The following symbols used within this manual call your attention to specific types of
information:
WARNING: Indicates a situation 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 caution is ignored.
Indicates a situation in which ESD protection should be used.
Identifies items that must be disposed of safely to prevent unnecessary damage to the
environment.
Note: A paragraph in this format provides useful supporting information on how to make
better use of your purchase.
2. Safe Use
WARNING: These products are not qualified for use in explosive atmospheres or life
support systems. Consult Bartington Instruments for advice.
WARNING: Environmental and electrical specifications should not be exceeded.
To prevent irreparable damage, electrostatic discharge (ESD) protection and precautions
must be used when handling the unpackaged sensor electronics board.
Note: Do not expose to strong magnetic fields while being stored as this can magnetise
the sensor and affect its offset performance.

BARTINGTON INSTRUMENTS
Page 4 of 9 OM2497/4
3. Introduction to the Mag670
The Mag670 is a single-axis fluxgate sensor that provides highly linear magnetic response and
low hysteresis. Each instrument consists of a single, feedback-stabilised, fluxgate sensing
element arranged along the length of the enclosure, which is orientated to point away from the
unit’s connector.
The sensor has no power supply or data processing abilities of its own and must always be
connected to a power supply to be able to function.
Regulating the power supply internally ensures that the Mag670 is suitable for battery-powered
operation, over both long and short cables.
Packaged and unpackaged versions are available.
4. Installing the Mag670
4.1. Siting the Sensor (Environment Recommendations)
Note: Site the sensor several metres from any magnetic base rock to avoid compromising
measurements.
Note: Site the sensor several tens of metres from very large ferromagnetic objects that
could create fields exceeding the measuring range of the sensor.
Note: Avoid siting the sensor near any ferromagnetic objects that may be subjected to the
effects of magnetic hysteresis, which would affect the sensor in an unpredictable manner.
Note: Conduct a magnetic evaluation of any proposed installation site to establish that
it is free from magnetic contaminants. Carry out such an evaluation using total field or
resonance sensors.
4.2. Cable Recommendations
Note: The connecting cable to the sensor should be a five-core screened cable. Two cores
will be used for positive and negative power supply lines, one core for output signal, one
core for signal common, and one for power supply ground. The screen should be connected
to supply ground at the supply end only. The capacitance between cores should be less
than 200pF per metre.
Note: Pin out values are shown in drawings DR2545 and DR2945.
Note: Leads are susceptible to electromagnetic interference and should be screened
wherever possible.

BARTINGTON INSTRUMENTS
Page 5 of 9 OM2497/4
Note: The length of the cable is limited by the voltage drop in the power supply lines
and the capacitance between the cores. For this reason the cable should be limited to a
maximum length of 600 metres.
Bartington Instruments can supply cables for connection of the sensor to the PSU1, Magmeter,
SCU1 and Spectramag-6 data acquisition and power supply units.
4.3. Pre-Installation Tests
Prior to the installation of the system, the sensor, cable and power supply must be fully tested to
ensure correct function as follows:
Caution: Take care to avoid bending or otherwise damaging the contacts whilst conducting
the tests.
1. Test the cables for continuity (using an electrical continuity tester or ohmmeter).
a. Test the cables end to end at the connectors, to ensure that the correct pins have
been allocated to the conductors and that there are no open or high resistance
circuits.
Note: Cable resistance will vary: refer to the product brochure for the expected values.
b. Test the cables at the connectors to ensure that there are no short circuits between
the conductors.
2. Check the power supply output voltage using a voltmeter. Refer to the product brochure
for the expected values.
3. Connect the sensor to the cable connector.
4. Connect the power supply to the other cable connector.
4.4. Mounting Recommendations
Each sensor in both packaged and unpackaged versions has a set of mounting holes to allow
attachment to a stable base or fixture. Refer to drawings DR2545 and DR2945 for further
information.
The sensor can also mounted on the Bartington Instruments Mag-TA Universal Tripod Adaptor.
See the product brochure for instructions on how to do this.

BARTINGTON INSTRUMENTS
Page 6 of 9 OM2497/4
4.5. Post Installation Testing
1. Switch on the power supply and wait until the sensor has stabilised. Refer to the
product brochure for warm-up times.
2. Confirm no magnetic objects are moving in the vicinity.
3. Check the output:
a. connect a voltmeter between output and GND;
b. whilst monitoring the voltmeter readings, align the sensor with the terrestrial field
until the maximum voltage value is determined;
c. confirm that the measured reading approaches the local geomagnetic field value.
Note: Geomagnetic field values can be provided by your local magnetic observatory. A
margin of error due to local disturbance should be taken into account.
Note: The outputs from the sensor should remain stable to within the quoted noise limits.
Refer to the product brochure for the expected values.
5. Using the Mag670
5.1. Magnetic Hysteresis
Caution: Subjecting the sensor to fields in excess of 2 x the nominal range may cause
inaccuracy in future measurements. Degaussing the sensor can reverse such an effect.
Note: The Mag670 is designed to have an extremely low magnetic hysteresis. However,
Bartington Instruments recommends your sensor is not subjected to magnetic fields
greater than their stated measuring range for extended periods as this could alter the
DC offset. If this occurs, the offset will exhibit drift as it returns to its original offset
specification.
5.2. Environmental Precautions
Refer to the product brochure for maximum environmental electrical and mechanical ratings.
Caution: Exceeding the maximum environmental ratings may cause irreparable damage to
your sensor.

BARTINGTON INSTRUMENTS
Page 7 of 9 OM2497/4
6. Troubleshooting
The sensor is unlikely to suffer any defects in normal use: no internal components are
serviceable. The most likely causes of failure, and their solutions, are detailed in the following
table.
In the event of any apparent malfunction beyond those described in the table below, please email
[email protected]om, or telephone the Bartington Instruments service team on +44 (0)1993
706565.
Causes of Failure Solution
Power supply failure Check the power, as detailed in Pre-
Installation Tests.
Cables Test the cables, as detailed in Pre-
Installation Tests.
Power input If no fault can be found in the power supply
or cables, ensure the cable length is not
too long, causing excessive voltage drop
between the power supply and sensor.
Refer to the specifications defined in the
product brochure.
Sensor damage Physical damage to the Mag670 cannot
be repaired. Replace with a new unit. See
Disposal.
7. Care and Maintenance
No servicing is normally required. No repair is possible. For further details refer to
Troubleshooting.
7.1. Cleaning Mag670 Sensors
Caution: To clean an unenclosed variant of the Mag670, use an air duster to blow out
dust and debris if required. Use appropriate personal protective equipment, such as eye
protection, when carrying out this task.
Caution: Avoid using chemicals, such as solvents, when cleaning the Mag670. Use a damp
cloth to remove grime from enclosures (packaged version only).

BARTINGTON INSTRUMENTS
Page 8 of 9 OM2497/4
Caution: Take particular care when cleaning around electrical connections. Bent or
damaged pins may cause the sensor to malfunction. The pins should ONLY be cleaned
gently using a soft material dipped in Isopropanol (IPA). Avoid any contact with the rest of
the sensor as this is likely to cause damage. Refer to the manufacturer’s Material Safety
Data Sheet (MSDS) for information on using this chemical safely.
7.2. Calibration
Return the Mag670 to Bartington Instruments for calibration at the recommended intervals.
Refer to the Calibration Certificate for further details.
8. End of Life Disposal
This product (electrical and electronic equipment) should not be placed in municipal waste.
Check local regulations for disposal of electronic products.
8.1. Waste Electrical and Electronic Equipment (WEEE) Regulations
This sensor complies fully with Restriction of the Use of Certain Hazardous Substances in
Electrical and Electronic Equipment (RoHS) and WEEE Regulations current at the time of
printing.

www.bartington.com
INNOVATION IN MAGNETICS
Telephone: [phone] •Fax: [phone] •Email: [e-mail] •Website: www.bartington.com
Bartington Instruments Ltd
5, 8, 10, 11 & 12 Thorney Leys Business Park
Witney, Oxford, OX28 4GE. England
®The copyright of this document is the property of Bartington Instruments Ltd.
Bartington is a registered trademark of Bartington Instruments Limited in the following countries: Australia, Brazil, Canada, China, European Union, India,
Israel, Japan, Mexico, New Zealand, Norway, Russia, Singapore, South Korea, Switzerland, Turkey, United Kingdom, United States of America and Vietnam.