Accurate groundwater surveys with sTEM

The sTEM geoscanner

Unlock hidden Groundwater Resources with Ease

The sTEM geoscanner is a unique invention for precise and efficient groundwater surveys. Conduct single-site measurements, capturing data that reaches depths beyond 300 m (980ft). With its affordability and robustness, the sTEM geoscanner is operated via Android or iOS app and offers valuable insights into groundwater resources.

Efficiency and Versatility Combined

The sTEM geoscanner ensures efficient surveys with reliable performance. Its transmitter capacity enables robust measurements, covering a substantial area per station. Explore deep groundwater resources with a depth of investigation exceeding 300 m (980ft).

Convenient Portability and Connectivity

Designed for convenience, the lightweight and portable sTEM geoscanner instrument, cable drum with transmitter wire and cable drum with the receiver cable weighs approximately a total of only 23 kg (50 pounds). It can be easily transported in a solid shipping box as check-in luggage on airplanes. With Wi-Fi and internet connectivity, enjoy seamless data upload and remote support.

Difference between sTEM and sTEM+

sTEM outputs a maximum of 5 Amp on the high transmitter moment. sTEM+ can transmit up to 10 Amp for increased depth of investigation. sTEM can be upgraded to sTEM+

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. Corresponds to a full day of operation
  • 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