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GEM System Specifications Features and Capabilities

Core Capabilities-Flexibility with Value

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:

  • Performance
  • Operating Mode
  • Data and Input/Output
  • Mechanical/Power
  • Maintenance and Support
  • Environmental
  • Shipped Component

After comparing the capabilities for each system, you may also want to refer to our information on Options, which includes:

  • Building Blocks
  • Sensor Options
  • GPS Options
  • GPS Navigation Options
  • Software Solutions

To review information on options, GEM System Options.

GEM Core Capabilities

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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