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Sigma 3+

Product information, applications, features, benefits, and brochure.

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Sigma 3+

Sigma 3+

Overview

The Sigma 3+ is a robust and versatile nodal seismograph designed for autonomous recording, monitoring, and active-source seismic acquisition. It builds on the performance of the original Sigma system while using a new streamlined case design that is smaller, lighter, and easier to deploy in the field.

The Sigma 3+ provides continuous recording as standard, making it well suited for autonomous operation, long-term monitoring, and passive seismic applications. Internal GPS provides clock discipline and location information, while mesh radio, cable, Wi-Fi, or cellular Ethernet options support command, control, and field data offload.

The system supports active-source acquisition with vibroseis, dynamite, and impulsive sources, as well as passive applications including hydraulic fracturing monitoring, surface wave acquisition, long-term permanent monitoring, and earthquake monitoring.

Features

Sigma 3+ Improvements
  • New streamlined case design
  • Smaller size with 60% less volume than the original Sigma 3
  • Less weight with 40% reduction compared to the original Sigma 3
  • Same excellent performance as the Sigma Box
  • Compact rugged design for field deployment
Continuous Recording & Timing
  • Continuous recording standard for monitoring and autonomous operation
  • Internal GPS for clock discipline and location information
  • VHF or wire timing option for mining and underground projects without GPS
  • Maximum trace length supports continuous recording
  • Sample rates from 125 to 4000 samples per second
Network & Field Data Access
  • Mesh radio network for deployment, command, and control of nodes
  • Cable, Wi-Fi, or cellular Ethernet support
  • In-field data offload while recording
  • Ruggedized 10-pin 100Base-Tx Ethernet connection
  • Ruggedized 19-pin external USB connection
Hot-Swap Options
  • Hot-swap external storage option
  • Collect data without interrupting operation
  • Hot-swap battery option
  • Change batteries without interrupting operation
Sensor & Power Support
  • Three input channels
  • Battery power output for active sensors
  • Supports accelerometers and broadband sensors
  • Low x1 and high x16 preamp gains
  • 20 kOhm input impedance
Acquisition Software
  • Active source acquisition software
  • Local or remote event monitoring software
  • Long-term continuous recording software
  • Supports autonomous and monitoring workflows
Electronics Specifications
  • Typical dynamic range: 126 dB low gain, 122 dB high gain at 500 sps
  • Typical harmonic distortion: 0.0001% at 500 sps
  • Typical noise floor: 0.8 µV RMS low gain, 0.08 µV RMS high gain
  • Bandwidth from DC to 85% Nyquist
  • Digital low-cut filters
Physical Specifications
  • Internal memory: 8 GB
  • Power requirement: 0.4 watts per channel
  • Voltage requirement: 9 to 28 volts
  • Size: 271 x 286 x 55 mm / 10.7 x 11.3 x 2.2 inches
  • Weight: 3 lbs 2 oz / 1.4 kg
  • Operating temperature: -40°C to 80°C
  • Rugged IP67 case

Benefits

Deploy Faster With Less Weight
  • The streamlined Sigma 3+ case is smaller and lighter than the original Sigma 3, helping field crews deploy and retrieve nodes more efficiently.
Record Continuously for Autonomous Projects
  • Continuous recording as standard supports autonomous acquisition, monitoring, and long-term seismic recording applications.
Improve Field Flexibility
  • Mesh radio, cable, Wi-Fi, and cellular Ethernet options provide multiple ways to command, control, and offload data in the field.
Reduce Downtime
  • Hot-swap storage and battery options allow crews to collect data or replace batteries without interrupting operation.
Support Active and Passive Seismic Work
  • The Sigma 3+ can be used for vibroseis, dynamite, impulsive source acquisition, hydraulic fracturing monitoring, surface wave work, and earthquake monitoring.
Operate in Harsh Environments
  • The rugged IP67 case and wide operating temperature range support reliable field operation in demanding seismic environments.

Related Applications

Learn more about applications commonly used with this product.

Autonomous Nodal Acquisition
  • Use continuous recording and internal GPS timing for autonomous seismic acquisition projects.
Active Source Acquisition
  • Acquire active-source data with vibroseis, dynamite, or impulsive source systems.
Hydraulic Fracturing Monitoring
  • Use Sigma 3+ nodes for passive monitoring during hydraulic fracturing operations.
Earthquake Monitoring
  • Support local or remote seismic event monitoring and long-term continuous recording.
Surface Wave Acquisition
  • Use Sigma 3+ for surface wave acquisition and passive seismic studies.
Underground & Mining Projects
  • VHF or wire timing options support projects where GPS timing is difficult or unavailable.

Brochure

Sigma 3+ Brochure