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CHAPTER - III
SPECIFICATIONS
Radiation detected : X – ray & Gamma Radiation
Range : 0.1 mR/hr to 100 mR/hr
Detector : Halogen quenched GM tube LND712
Accuracy : +/-10% Full scale
Display : Auto – ranging direct reading, 6 digit 7 segment LED display & 16x2 LCD display.
6 x 7 segment display is interfaced using multiplexed display driver IC & used
for display of dose-rate information. 16x2 LCD for visualization of preset alarm
& other parameters.
Time Constant : Time constant varies continuously from 16 sec to 0.5 sec depending upon
countrate
Calibration Accuracy : +/-10% throughout the range
Calibration Stability : Better than +/-10% over a period of six months
Alarm range : 0.1 mR/hr to 99.9 mR/hr
Alarm setting accuracy & stability
Better than +/-10% over a period of six months
Alarm System : a. Alarm indication is by flashing Red (LED) large area window display and
Loud audio alarm
b. Distinctive EHT / Detector failure alarm
c. The instrument has alarm acknowledgement and Reset switches on front
panel
d. Provision for remote alarm acknowledge and reset
e. Alarm annunciation scheme: as tabulated below
Condition Visual indication Audio
(Red LED)
Normal OFF OFF
Abnormal (Active) Flashing ON
On acknowledgement
after being abnormal Steady Red OFF
Reset after returning to Normal OFF OFF
Monitor Enclosure : Vapour-tight, rugged & elegant. The instrument can be offered with compliance
to required IP standards.
Mounting : Monitor is wall-mountable type.
Data Storage : Microcontroller has on-chip EEPROM to store the preset alarm levels and other
settings.
Self-Diagnostics : The monitor has built-in self-diagnostics. On being powered it performs tests to
check for the High voltage supply, Detector and pulse processing electronics .
Power : 230 VAC +/-10%, 50 Hz, single-phase supply.
Environment : The instrument will be able to withstand temperature upto 60 deg C and relative
humidity upto 90% in radiation areas.
Front panel keypad : Keypad provided on Front Panel facilitates user to configure & program the Area
Monitor (deactivated by internal jumper selection).
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