Convenient geoscanning system for sites with sTEM+

The sTEM+ geoscanner

Efficiency and Versatility Combined 

The sTEM+ geoscanner stands out as an innovative tool for conducting precise and efficient groundwater surveys. It excels in capturing data at depths exceeding 300 meters (approximately 980 feet) and offers a cost-effective and rugged solution. Operating the sTEM+ geoscanner system is a breeze with its compatibility with Android and iOS apps, providing valuable insights into groundwater resources. This geoscanner ensures dependable performance, thanks to its robust transmitter capacity that covers a substantial area per station.

The sTEM+ system comes with

  • 40 x 40 m (131 x 131 feet)
    The default on sTEM/sTEM+ geoscanner
  • 20 x 20 m options (65 x 65 feet)

Difference between sTEM and sTEM+

The sTEM+ geoscanner can deliver a maximum of 10 Amps with its high transmitter moment making it possible to capturing data that reaches depths beyond 300 m (980ft). This user-friendly and budget-friendly tool allows you to perform measurements at more than 15 stations daily. With the sTEM geoscanner, you can explore subsurface depths and gain valuable insights into groundwater resources. While the measurement resolution might be somewhat lower compared to the tTEM geoscanner, the sTEM system provides an efficient and cost-effective solution for conducting surveys. Its straightforward operation makes it an excellent choice for various groundwater exploration applications. Additionally, the geoscanner is equipped with Wi-Fi and internet connectivity, facilitating remote support and seamless data uploads.

We understand the importance of convenience in field work and the sTEM+ is designed for convenience. The lightweight and portable geoscanner weighs approximately 30kg and it can be easily transported in a solid shipping box as check-in luggage on airplanes.

Unique features of the sTEM and sTEM+ instruments:

  • Dual moment system for shallow and deep information​ 
  • Integrated Tx and Rx hardware in one unit​ 
  • Transmitter loop size: 20 x 20 m or 40 x 40 m options (65 x 65 feet, 131 x 131 feet).
  • Active current regulation, 1 A low transmitter moment, 5/10 A high transmitter moment (sTEM/sTEM+)​ 
  • Depth of investigation: Up to 300 m (980 ft). 
  • Power supply: Two 14,4 V lithium batteries at 99Wh each. 
  • Total weight (including transmitter and receiver coils): around 23 kg (56 lbs).
  • Portability: Shipping box for convenient airplane check-in. 
  • Connectivity: Wi-Fi and internet for remote support and uploade of data to cloud.
  • Operated by Android and iOS App​ 
  • Suppression of external noise by tapered gating​ 
  • Real-time data stacking and calculation of data certainties​ 
  • Automatic sign correction of data​
  • Real-time data inversion 

"We've wrapped up the field work here in Kakuma. I got to say, excellent work with the sTEM. You guys have really built an incredible system. The Kenyans, with no geophysics experience, can collect data without support after maybe 2 or 3 sites. They were able to measure at a site, start to finish, in 10 mins 20 seconds. And the app is really easy to use. One of them asked if sTEM stood for simple TEM because it was so easy."

Denys GrombacherAssistant Professor, Aarhus University
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