Shutdown Area Radiation Monitor type GA723, manufactured by NUCLEONIX SYSTEMS employs radiation tolerant design and is primarily meant for installations at shutdown areas of the plant to indicate dose rates and give alarm, visual and aural, once the dose rates exceed the preset level fixed by the user. Also relays will be activated on alarm.
This will be installed at various shutdown areas of the plant to provide local display of activity levels and also activity level signals to a central activity monitoring system in the control room. In the event of high activity at any of the installations, the monitor will provide powerful visual and aural warning signals to the working personnel. The alarm unit is an integral part to provide annuciation both locally & remotely in the control room.

This unit indicates the dose rate digitally on a 4 x 7 segment LED display. Unit has additionally 16x2 LCD dot-matrix display which indicates fault dignostic info & preset level & other configuration parameters. Each of the annunciator windows for NORMAL and ACTIVE conditions has LED array. Once alarm triggers ACTIVE window starts blinking.
Unit can be programmed / configured using front panel keypad which can be deactivated after completion of programming. Configuring the unit namely setting preset level, setting reset mode - AUTO/MANUAL etc are achieved by this keypad.
Unit also performs self-diagnostics for EHT failure, pulse processing electronics failure & detectors failure on power up.
Alarm acknowledge and reset pins are provided on the circular I/O connector for remote acknowledge & reset. RS485 port is also available optionally.