The sensor junction box SEN-JB-GMS for GMS increases the flexibility of GMS-based systems in terms of topology. The internal DC-DC converter provides a stabilized and insulated 15 VDC supply to the sensor(s), allowing for sensor cable lengths up to 1000 m. Furthermore, the SEN-JB-GMS can be used to combine uni- and/or bi-axial sensors on one connector of the GMS series. Full overvoltage protection and an IP66 watertight housing make it a valuable accessory for any GMS based measuring or monitoring system.