Burris Gravity Meter ™ for Land Applications

The Automated Burris Gravity Meter™ with V-Grav™ Control System

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Introduction

It took ZLS over 6 years to develop a new metal, zero-length spring land gravity meter. The Burris Gravity Meter™  is not a repackaging of old technology.  It is a new meter designed especially to take advantage of the latest advances in digital technology.  The result is a meter with superior digital performance and ease of use. It is the most precise and rugged gravity meter on the market.  V-Grav™ control electronics  automate the Burris Gravity Meter™ allowing it to be used with microGal precision.

  • Highest Quality and Most Precise
  • Most Rugged Land Meter
  • ZLS Clamping Mechanism Alleviates the Hysteresis Endemic to Meters Not Offering a Clamp
  • Earth Tide Monitoring
  • Real Time Graphics of Beam and Levels
  • One Tenth of a MicroGal Resolution
  • Easy to Use for Students – Sophisticated for Experts
  • Automatic Reading
  • Weather Resistant

Click here for a downloadable pdf file of the Burris Gravity Meter brochure: ZLS Burris Gravity Meter

Applications

The Burris Gravity Meter™ comes in a number of configurations to fit your budget and needs. V-Grav™ allows the user to choose the level of precision needed for each application.  Lower precision results in faster reading times, allowing more stations to be logged in a day.  Higher precision allows the Burris Gravity Meter™ to be used for the most demanding microGal surveys.  Whatever your application needs, you now have a choice with V-Grav™.

  • Petroleum Exploration
  • Mineral Exploration
  • Civil Engineering
  • Geophysical Mapping
  • Geotechnical and Archaeological Exploration
  • Groundwater and Environmental Studies
  • Tectonic Research
  • Volcanology Research
  • Geothermal Research
  • Your Specific Application

V-GravTM

Introducing V-GravTM!   Burris Gravity Meter now has graphics!

The new control app designed for Android Tablets now has several new features:

  • Visually monitor the Beam and Levels during measurements.
  • The new Survey feature allows for sequential numbering of stations.
  • Data files can now be viewed on the tablet for in the field Quality Control.
  • Easily add various filters during measurements in noisy environments.
  • GPS functionality.
  • Transfer data to a computer via cable transfer or email with ease.
  • Saved files will not be lost in case of loss of power to the tablet.

Graphics aid in obtaining a more precise measurement.  For the first time ever on a Burris Gravity Meter, you can visually see the displacement of the sensor’s beam in real time.  Beam displacement and level position allow you to decide when it’s best to take a measurement.  If the environment is very active, with just a touch of a button, you can increase filtering.  This is real control at your fingertips.

A new surveying feature has been added to accommodate surveys where sequential numbering of lines and stations is needed.  The new Survey mode is designed to minimize the time spent at each station.  This is done with V-Grav™’s quick read and automatic line and station numbering features. Now you have more choices for taking measurements; Station mode, Survey mode, and Continuous Mode.

V-GravTMis installed on a 7” Android tablet for flexibility in the field.  The app can be installed on any Android device 6” or larger with Bluetooth capabilities.  This makes V-GravTMconvenient to use and easy to maintain in the field. Data files can be viewed within the Android device for quick quality checks.  Saved observations can be downloaded via USB cable, memory stick, or simply emailed.  Data files once saved are protected from power loss.

V-GravTMhas been streamlined to be easier to use yet is more powerful.  GPS coordinates from the Android device can be used if more accurate coordinates are not available.  The program offers optional filtering to facilitate single observations during noisy environmental conditions.  Many of the functions have been combined to give you more information.

ZLS Leveling System

The Burris Gravity Meter™ leveling system is fast and easy to use.  It consists of three leveling legs which can be accessed from the top of the meter. The meter can be placed directly on the ground or on a base plate.  Under normal field conditions, the Burris Gravity Meter™ can be precisely leveled for microGal readings within 30 seconds. However, precise leveling is no longer needed as V-Grav™ can be configured by the operator to perform automatic off level corrections.  Unlike bottom leveling systems where the meter is placed blindly into slots, the Burris Gravity Meter™ is easily placed on the ground or a base plate.  With the ZLS manual leveling system there are no motors to reduce battery life or break down during a survey.

The Heart of The Burris Gravity Meter™

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Each Burris Gravity Meter™ is built around a hand made, metal, zero-length spring.  ZLS springs have extremely low hysteresis and drift rates.  When new, ZLS springs drift approximately 1.0 mGals per month after aging and when mature, drift less than 0.3 mGals per month.  Data have shown that the spring’s drift rate improves with age.  The prototype has a drift rate of approximately 0.030 mGals per month.  V-Grav™ provides unsurpassed precision over large ranges and eliminates a class of errors known as circular error. Calibration values are stable over time as they are determined by a metal micrometer screw.  The Burris Gravity Meter™ has consistently yielded standard deviations of 0.003 mGal or better during routine field tests.

Small, Portable and Weather Resistant.  The Burris Gravity Meter™ contains the sensor, electronics, computer and battery “All-In-One” easy to handle unit.  The Burris Gravity Meter™ is sealed to keep out the weather so you do not have to worry about those sudden rain or dust storms.  Small in size, with the lithium-ion battery, the meter weighs less than 13 pounds (5.9 kgs). With one battery the meter will last on standby for 16 – 18 hrs. and operate for 14 hrs. at 23°C.

Reliability

ZLS Corporation has over a century of combined experience in the design and  manufacture of metal, zero-length spring gravity meters.  The V-Grav™ control system has been used and proven in the field by leading universities and agencies around the world since 1994.  The Burris Gravity Meter™ was developed by the world’s most experienced designer of metal spring gravity meters, Larry Burris.  Each Burris Gravity Meter™ is unconditionally warranted against any defects in parts or craftsmanship for a period of two years and carries a two year warranty against sticking of the mass on the stops.

Calibrated and Non-Calibrated Screw Meters 

ZLS offers two models of the Burris Gravity Meter™ : Calibrated and Non-Calibrated Screw. Both meters are identical in construction and have the same automatic reading resolution of 0.0001 mGal. The only difference is that one meter has a calibrated screw and the other does not. 

▪ Calibrated Screw Meter 

The Calibrated Screw meter is intended for users who routinely survey large geographic areas, mountainous regions or continental surveys. ZLS calibrates the micrometer screw at discrete 50 mGal points over the entire working range of the screw. The precision of calibration is +/- 0.015 mGal. With the Calibrated Screw meter, the dial can only be used at calibrated points for large geographic surveys. The Calibrated Screw meter can also be used like a Non-Calibrated Screw meter for short range surveys or stationary site measurements. 

Non-Calibrated Screw Meter 

The Non-Calibrated Screw meter is intended for users with short range surveys and/or stationary site measurement requirements. The micrometer screw can be set to any position, then locked for an observation. The Non-Calibrated Screw meter can be used for surveys larger than 50 mGals by tying the points together. For Secular Earth-Tide measurements, a station version of the non-calibrated screw meter is modified for lower range and higher internal precision. 

Delivery
Please contact us for current delivery estimate.

Options
Secular (Earth Tide) Meter. For precise earth-tide measurements, the Non-Calibrated Burris Gravity Meter™ can be configured with less range for a higher internal resolution of 0.0002 mGals.
Training Orientation classes are available.  Please contact us for more information.

Specifications

Sensor Type:Metal Zero-Length Spring
Hardened metal micrometer screw using electrostatic nulling
Reading Resolution:0.1 microGal
Standard Deviation:<5 microGal
Operating Range:Worldwide range (CG-6 is equivalent to Burris Gravity Meter) (extra range not needed due to low drift)
Uncompensated Drift (Mature):<20 microGal/Day (higher until mature)
Range of Automatic Tilt Compensation:<±200 arcseconds
Tares:Typically, <5 microGal for shocks up to 20G
Automated Corrections:Earth Tide, Instrument Tilt, Temperature
Data Output Rates:Single Observation: 5, 10, 15 second (user selectable)
Continuous Observation: >1 second (user selectable)
GPS Accuracy:2.5 meters typical accuracy
Touch-free Operation:Handheld Android Tablet with Bluetooth
Battery Capacity:Single 6.8 Ah (10.8V) Rechargeable Lithium Ion Smart Battery. 16 hrs. standby / 14 hrs. operating (at 23°C)
Power Consumption:4.07 W @ 25°C
Digital Data Output:USB, Bluetooth
Dimensions:7.50 X 10.50 X 12.00 in. (19.05 X 26.67 X 30.50 cm)
Weight:12.75 ± 1.00 lbs. (5.78 ± 0.45 kg)
Shipping Weight and Dimensions:Standard Shipping Box: 24.00 X 24.00 X 24.00 in. (60.96 X 60.96 X 60.96 cm) @ 40 lbs. (18.14 kg)
Optional Ruggedized Transit Case: 26.00 X 27.00 X 26.00 in (66.04 X 68.58 X 66.04 cm) @ 70.50 lbs. (31.98 kg)

Specifications are subject to change without notice. Results may vary depending on conditions.

The following are trademarks or registered trademarks of their respective companies or organizations:

Burris Gravity Meter™ and V-Grav™, ZLS Logo / ZLS Corporation.

Contact the Following Representatives for More Product Information

 

7801 North Lamar Blvd. Suite E-184 | Austin, Texas 78752 USA | Phone: 512-453-0288 | Email: info@zlscorp.com

Copyright © 2020 ZLS Corporation