GEM’s product families are carefully designed to offer you a range of non-overlapping capabilities so that you can select the ideal system for your application, sensitivity needs, budget, upgrade pathway, etc.
The following table shows a summary of Core Capabilities for the QuickTracker™ , Overhauser, SuperSenser™ and SuperGrad™ technologies. (To see how each of these technologies relates to your survey needs, you may want to have a quick look at the Application Configurator).
Core capabilities are organized in terms of the criteria that deliver our customers the most flexibility and value, namely:
After comparing the capabilities for each system, you may also want to refer to our information on Options, which includes:
To review information on options, GEM System Options.
Product Family | Proton | Overhauser | Potassium | SuperGrad |
Model | GSM-19T | GSM-19W | GSMP-35 | GSMP-20 |
Reading Mode | Slow | Walk (includes Slow sampling) | Super Fast (includes Fast and partial Walk sampling) | Super Fast (includes Fast sampling) |
Performance | ||||
Sensitivity (nT) | <0.1 | 15 pT/ÖHz at 1 sample/sec | 4.7 pT/ÖHz at 20 samples/sec |
0.00003 |
Absolute accuracy over temperature range (plus/minus nT) | 1 | 0.1 | 0.1 | 0.1 |
Dynamic range (nT) | 10,000 to 120,000 | 10,000 to 120,000 | 10,000 to 120,000 | 10,000 to 100,000 |
Gradient tolerance (nT/m) | > 7,000 | > 10,000 | 5,000 | 2000 |
Counter resolution (nT) | 0.01 | 0.01 | 0.0001 | 0.000001 |
Cycle time (seconds) | 60 to 3 | 60, 3, 2, 1, 0.5, 0.2 | 1, 0.5, 0.25, 0.2, 0.1, 0.05 | 1, 0.5, 0.25, 0.2, 0.1, 0.05 |
Model | GSM-19T | GSM-19W | GSMP-35 | GSMP-20 |
Operating Mode | ||||
Programmable base station | Yes | Yes | Yes | No |
Stationary (time, date and reading storage) | 60 to 3 seconds | 60 to 0.2 seconds | 1 to 0.05 seconds | 1 to 0.05 seconds |
Mobile (coordinates, time, date and reading stored automatically) | 3 sec minimum | 60 to 0.2 seconds | No | 1 to 0.05 seconds |
Walking (time, date and reading stored automatically. Coordinates assigned at picket) | 0.5,1 or 2 seconds | 0.5,1 or 2 seconds | 1 to 0.05 seconds | No |
Remote control (optional) | RS-232 | RS-232 | RS-232 | RS-232 |
Model | GSM-19T | GSM-19W | GSMP-35 | GSMP-20 |
Data and Input/Output | ||||
Standard Memory (4 Mbytes) | Yes | Yes | Yes | Dumps direct to computer |
Readings (base station) | 699,050 | 699,050 | 699,050 | Continuous reading |
Readings (mobile) | 209,715 | 209,715 | 209,715 | Continuous reading |
Readings (gradiometer) | 174,762 | 174,762 | 174,762 | Continuous reading |
Readings (walking mag) | 299,593 | 299,593 | 299,593 | Continuous reading |
Data transfer (115 Kbytes) | Yes | Yes | Yes | Yes |
Analog output (optional) | Yes | Yes | Yes | Yes |
Model | GSM-19T | GSM-19W | GSMP-35 | GSMP-20 |
Maintenance and Support | ||||
Expandable memory (4 Mbyte increments) | 32 Mbytes | 32 Mbytes | 32 Mbytes | 32 Mbytes |
Internet firmware upgrades | Yes | Yes | Yes | Yes |
Upgradeable to higher version or product family | Yes | Yes | No | No |
Model | GSM-19T | GSM-19W | GSMP-35 | GSMP-20 |
Mechanical/Power | ||||
Batteries | 1 internal | 1 internal | 1 internal and 2 external | N/A |
Battery belt | 176 x 78 x 125 | 176 x 78 x 125 | 267 x 178 x 76 cm | N/A |
Battery weight | 0.6 kg | 0.6 kg | 3.9 kg | N/A |
Console dimensions | 223 x 69 x 240 mm | 223 x 69 x 240 mm | 223 x 69 x 240 mm | 483 x 89 x 406 mm |
Console weight | 2.1 kg | 2.1 kg | 2.1 kg | 6.6 kg |
Sensor head dimensions | 75 mm dia. X 140 mm length | 75 mm dia. X 175 mm length | 89 mm dia. and 152 mm length | 26.3 cm dia. x 23 cm length |
Sensor head weight | 2.0 kg | 1.0 kg | 1.37 kg | 6.0 kg |
Sensor angle | N/A | N/A | 30 degrees between sensor head axis and magnetic field vector | 45 degrees plus/minus 35 degrees off magnetic field direction |
Electronics dimensions | N/A | N/A | 306 x 85 x 750 mm | 100 x 50 x 50 mm |
Electronics weight | N/A | N/A | 1.6 kg | 1.0 kg |
System warm-up time | N/A | N/A | 15 minutes @ 20 degrees C | 2 hours @ 20 degrees C |
Power supply | 12 V DC | 12 V DC | 22 to 32 V DC | 22 to 32 V DC |
Power start-up | N/A | N/A | 25W dropping to 8 W | |
Power consumption | 12 watt-seconds per reading | 2 watt-seconds per reading | 8 watt @ 20 degrees C | 12 W avg., 40 W max. |
Console power requirements | 12 V 2.2 Ah battery | 12 V 2.2 Ah battery | 12 V 2.2 Ah plus 24 V 7.2 Ah batteries | 28 V 6 A DC power supply |
Staff assembly | 2240 mm length | 2240 mm length | 760 mm length | N/A |
Staff weight | 1.0 kg | 1.0 kg | 1.2 kg | N/A |
VLF sensor | 160 x 150 x 150 mm | 160 x 150 x 150 mm | 160 x 150 x 150 mm | N/A |
VLF sensor weight | 1.3 kg | 1.3 kg | 1.3 kg | N/A |
Model | GSM-19T | GSM-19W | GSMP-35 | GSMP-20 |
Environmental | ||||
Operating temperature | minus 40 to 55 degrees C | minus 40 to 55 degrees C | minus 40 to 55 degrees C | minus 20 to 50 degrees C |
Humidity | 0 to 100% splashproof components | 0 to 100% splashproof components | 0 to 100% splashproof components | 1 to 100% splashproof sensors; console requires protected mounting |
Temperature storage | minus 70 to 55 degrees C | minus 70 to 55 degrees C | minus 70 to 55 degrees C | minus 70 to 55 degrees C |
Model | GSM-19T | GSM-19W | GSMP-35 | GSMP-20 |
Shipped Components | ||||
Batteries | Yes | Yes | Yes | No |
Battery charger | Yes | Yes | Yes | No |
Cable | 1.2 m sensor cable, RS-232 cable | 1.2 m sensor cable, RS-232 cable | 2.5 to 5 m between sensor/drive and 1 to 100 m between electronics/signal processor | User specified |
Console | Yes | Yes | Yes | Yes |
GEMLink software | Yes | Yes | Yes | Yes |
Harness for console | Yes | Yes | Yes | No |
Manual | Yes | Yes | Yes | Yes |
Sensor | Yes | Yes | Yes | Yes |
Shipping case | Yes | Yes | Yes | No |
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