Bartington Grad-13 Series Manual de usuario
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OM3100/5
Operation Manual for
Grad-13
Digital Three-Axis Magnetic Gradiometer
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Page 2 of 26 OM3100/5
Table of Contents
1. About this Manual 3
1.1. Symbols Glossary 3
2. Safe Use 4
3. Introduction 4
4. Grad-13 Digital Three-Axis Fluxgate Gradiometer 4
4.1. Grad-13 Battery Box & Multiplexing box 5
4.2. Grad-13 Cable Assembly 5
5. Grad-13 Battery Box 6
5.1. Functional Description 6
5.2. The Battery Box Front Panel 7
5.3. Power Supply 8
6. The Grad-13 Port Multiplexing Box 9
7. Installation of the Grad-13 10
7.1. Unpacking 10
7.2. Orientation 10
7.3. Mounting 10
7.4. Connecting 10
7.5. Connecting Custom Systems 10
8.
Operating
I
ns
t
r
u
c
t
i
o
ns 11
8.1. Operation 11
8.2. Visual Grad-13 Software Instructions 11
9. Storage 23
10. Servicing & Maintenance 23
11.1. Waste Electrical and Electronic Equipment (WEEE) Regulations 23
Appendix A: Guidance for Connection to Mains Supply 24
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1. About this Manual
This document describes the installation, operation and maintenance of the Grad-13 digital
three axis uxgate gradiometer from Bartington Instruments. It should be read in conjunction
with the product brochure DS3100, which can be found on the product page on the Bartington
Instruments website at www.bartington.com. Outline drawings are also available on this page.
Note that failure to follow the instructions in this manual may invalidate your product’s warranty.
If in doubt, do not hesitate to contact Bartington Instruments.
Bartington Instruments cannot advise on the integration of this equipment with any third party
products.
1.1. Symbols Glossary
The following symbols used within this manual call your attention to specic 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.
Identies items that must be disposed of safely to prevent unnecessary damage to the
environment.
Note: Provides useful supporting information on how to make better use of your
purchase.
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2. Safe Use
WARNING: These products are not qualied for use in explosive atmospheres or life
support systems. Consult Bartington Instruments for advice.
3. Introduction
The Grad-13 is a three-axis digital uxgate gradiometer which is available in multiple
congurations; two enclosure variants: Grad-13L for environmentally-sealed outdoor operation
and Grad-13S for underwater operation down to 200m submersion, three baselines: 500mm,
750mm and 1000mm and two sensor measuring ranges: ±70µT and ±100µT.
The unit is comprised of two, three-axis, uxgate magnetometers mounted either-end of a
mechanical stable chassis. Each cluster of uxgates is arranged such that the centres of the
three magnetic axes coincide at a common point. The baseline is the distance between these
two common points. Vector magnetic elds experienced by each of the three sensing axes are
converted to digital signals and transmitted via an RS422 interface.
4. Grad-13 Digital Three-Axis Fluxgate Gradiometer
Figure 1: Grad-13S Digital Three-Axis Fluxgate Gradiometer
Key
1. Cable to Grad-13 Battery/Multiplexing Box
2. Three-axis “Reference” magnetometer
3. Three-axis Accelerometer
4. Three-axis “Sense” magnetometer
1
2
3
4
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Note: Refer to the outline drawing DR3344 or DR3286 on the product webpage for further
information.
The magnetometer assemblies are supported on shock resistant mounts inside a carbon bre
composite tube having ‘O’ ring seals at each end. Power is applied to the unit and digital
signals are transmitted via an environmentally sealed connector.
The electronics are designed to minimise oset, scaling and orthogonality errors.
Power supply is provided using the Grad-13 Battery or Multiplexing Box and basic software is
provided to interpret the RS422 digital data.
4.1. Grad-13 Battery Box & Multiplexing box
Bartington Instruments can provide two options for powering the Grad-13 and converting the
signal output to either USB or ethernet output. These options are the Grad-13 Battery Box or
the Grad-13 Multiplexing box. Grad-13 can be powered through customer’s own hardware if
available.
4.1.1. Grad-13 Battery Box
The Grad-13 Battery Box converts the signal from the Grad-13 to USB output. It is designed
to be used with up to two gradiometers. See Section 5. Grad-13 Battery Box for further
information.
4.1.2. Grad-13 Multiplexing Box
The Grad-13 Multiplexing Box will convert the signal from the Grad-13 to ethernet output. It will
be designed to be used with up eight gradiometers. (under development)
4.2. Grad-13 Cable Assembly
Note: See drawing DR3344 (Land version) and DR3286 (Marine version) on the product
webpage.
The cable supplied with the Grad-13 for connection to the Grad-13 battery box is appropriate
to and dependent upon the version it is supplied for, i.e. Land or Marine. The polarity of the
connectors prevents incorrect connection.
To connect the Grad-13S variant to a battery box, an accessory cable, the Grad-13S
Underwater to Land Extension Cable, is required.
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5. Grad-13 Battery Box
This section describes the installation and operation of the Grad-13 Battery Box.
5.1. Functional Description
The Grad-13 battery box allows connection of one or two Bartington Instruments Grad-13
gradiometers. It powers the gradiometer and converts the RS422 communication to USB. A
rechargeable battery is built into the box and a dedicated charger is provided with the unit. A
dedicated USB cable is also provided to provide connectivity to a computer.
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5.2. The Battery Box Front Panel
Figure 2: The Grad-13 Battery Box
Key
1,2: Connector for connection to Grad-13 gradiometer
3: Connector for connection to PC via USB 2.0
4: Charger connector for connection to mains power
5: ON/OFF power switch
6. Power status indicator
Note: See the outline drawing DR3911 on the product webpage for further information.
On-o switch operation:
a. Push and hold on for half a second to turn on.
b. Push and hold for over three - four seconds to turn o.
The units are housed in a polycarbonate enclosure. Connectors on the front panel provide
connections to two Grad-13’s and to a PC for digital output, with a socket for the charger input.
6
1
2
4
3
5
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5.3. Power Supply
The battery box contains a lithium ion battery with a nominal voltage of 26V and an energy
density of around 7Wh. It is capable of powering a single Grad-13 for up to 16 hours, and two
Grad-13s for up to 8 hours, dependent on temperature and cable length.
The On/O power switch light will ash when the battery is around 80% discharged. The length
of time taken to discharge to this level depends upon the number of gradiometers connected,
the battery age, and the battery temperature.
WARNING: The mains supply to the charge must be switched o before connecting or
disconnecting the charger to the Grad-13 battery box.
5.3.1. Charging
Note: Charging temperatures should be between 0oC and 45oC.
The battery charger supplied with the battery box is shown below. The mains input socket is at
the rear. The charge input voltage range is 100-240V, so no voltage selector switch is required.
The front panel of the changer includes a yellow/green LED, which indicates power and
charging status.
At switch-on the LED ashes yellow/green and then indicates the following statuses.
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LED Indication Status
Yellow Standby mode
Yellow/green ashing Outside of valid temperature (wait)
Green ashing Charging
Green At least 80% charged. Wait for one further
hour for full charge.
Yellow ashing Error
Battery charging time from at is around three hours, but charging for longer (typically
overnight) is acceptable as the charger will switch to standby mode when the battery has
reached full charge.
All multi-cell Lithium Ion batteries should be kept charged during storage to avoid deep
discharging. The battery will gradually discharge when the Grad-13 Battery Box is de-powered
due to a small current draw caused by the battery’s internal protection circuit. Re-charge after
each use up to at least 80% charge (green LED on charger). If the Grad-13 Battery Box is going
to be stored for long periods, then charge the device beforehand and charge at least twice a
year to avoid irrecoverable deep discharge.
6. The Grad-13 Port Multiplexing Box
Product in development - expected 2022 release.
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Page 10 of 26 OM3100/5
7. Installation of the Grad-13
7.1. Unpacking
Safe handling precautions must be observed.
7.2. Orientation
See Outline Drawings for axis orientation.
7.3. Mounting
The sensor assembly is mounted in a stress free manner within the outer protective tube.
Note: Ensure that the Grad-13 enclosure is not excessively stressed, as the alignment of
the sensors may be aected or the assembly integrity may be compromised allowing the
ingress of foreign matter.
Note: See drawings DR3344 and DR3286 on the product webpage.
7.4. Connecting
The Grad-13 is connected to the Grad-13 battery box using the cable supplied. Connect Grad-
13 to connections 1 or 2 of the battery box located on the front of the unit using the cable
provided.
7.5. Connecting Custom Systems
A data protocol DP2629 can be provided if the Grad-13 is to be powered by and connected
to a custom system. The API/software may still be able to be used if an Ethernet or Serial
Connection is provided.Please contact Bartington Instruments for further information.
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