Convergence Monitor

Geonor, Inc - Precision Instrumentation


The RST Convergence Monitor is an economical, robust instrument for the continuous or random monitoring of ground closure in mining and civil engineering projects.

The convergence monitor consists of a sensor unit coupled to a lower, spring loaded leg and an upper, adjustable leg. The sensor itself consists of a digital indicator that displays movement in inches or millimeters.

Optionally, the convergence monitor can be modified to include the ability to be remotely read by a datalogger. This is especially useful in applications where continuous monitoring is essential.


  • Digital indicator with standard range of 150 mm (6 in.).
  • Adjustable upper leg with coarse height adjustment, 150 mm (6 in.) increments, and fine height adjustment, 25 mm (1 in.) increments.


  • Mine development in squeezing ground.
  • Tunneling.
  • Remnant mining.
  • Roadway intersections.
  • Regional subsidence and closure surveys.


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