Chapter I Introduction - NUCLEONIX SYSTEMS GA720 Instruction Manual

Gamma Area monitor (Micro) Type: GA 720, manufactured & supplied by NUCLEONIX SYSTEMS is designed
using state-of-art electronic devices (latest) including microcontroller with embedded code. Use of these devices
makes it compact & highly reliable. Powerful embedded code adds-up and enhances its performances and gives
extra advantage from the angle of fault diagnostics. This unit is primarily designed to indicate dose rates in the
range of (0-100mR/hr).
This unit will be useful for monitoring Gamma dose rate levels in working areas of Radio Isotope Laboratories,
Radiology departments, Medical & Industrial Radiological installations apart from its usefulness in Atomic Power
Stations and other active labs.
This unit goes into acquisition mode directly after power on after the initial introduction & self check. It indicates
dose rate digitally on 6x7 segment LED display as well a 16x2 LCD display. There are two visual annunicator lamp
windows GREEN & RED for NORMAL & ACTIVE conditions. The ACTIVE window flashes once the dose rate
alarm occurs and in normal condition the NORMAL lamp glows.
The user interface is through a front panel keypad comprising of EHT, PROG, INC, DEC, ACK & RESET keys.
PROG key shows up different menu options on successive operation. INC, DEC are used to scroll / select various
PROG options. ACK and RESET are used for acknowledging and resetting the unit during Active mode. The unit
has user selectable options like Alarm preset level, Baud rate (for serial communication), Reset mode (auto or
manual) and other system settings. Pressing EHT key displays the current EHT value in the detector probe.
For external detector arrangement the detector can be connected 10 meters away from the monitor through a
cable arrangement.
Some important features of this unit are :
Microcontroller based design has been employed
Dose rate range covered (0.1 - 100) mR/hr
Auto ranging & auto TC selection in the range of 16 sec to 0.5 sec depending upon dose rate
Large size 6x7 segment LED indication for dose rate is provided
Designed using LND GM tube type 712
Large size WINDOWS for NORMAL & ACTIVE alarm condition
16x2 LCD display dotmatrix display for visualization & settings of various options
CHAPTER- I
INTRODUCTION
VIEW OF GAMMA AREA MONITOR
TYPE : GA720
1