The RDS-31 Alarm Monitor is intended for stationary or fixed installation in premises where people may be exposed to ionizing radiation.

The RDS-31 advanced survey meter is the main instrument, with one internal GM counter it covers dose rates from 0.01 uSv/h to 100 mSv/h. The system can be equipped with any GMP-12 series H* (10) probe to increase the upper dose rate level up to 10 Sv/h max.

The RDS-31 meter can be configured for dual display function, thus the results from both the internal and the external detector are then simultaneously shown in the graphic display. The casing, Fibox type 17/16L3, includes one relay board with potential free changeover contacts for external alarm equipment or driving other external equipment, such as door control units etc. External alarm equipment and indication/warning lights are usually mounted on top of the casing.

The system is powered by a 230 V ac/12 V dc power supply. The internal batteries are used for back-up power supply of the RDS-31 meter in case of mains failures (the external alarm equipment are not backed up).