GATE -MONITOR Type: NXG_ERM4, manufactured & supplied by Nucleonix Systems is primarily designed to indicate dose rates in the measuring unit selected & produces audio/visual alarms, if the dose rate exceeds preset value. By default the unit is set to be in µR/hr & the range is 0µR- 10mR/hr).

It uses latest state-of-art electronic devices including SoC based on ARM cortex A5 400MHz CPU with associated peripheral devices and other discrete ICs & components. Use of these ~ devices makes it compact & highly reliable. Powerful embedded code adds – up and enhances its performance and gives extra advantage from the angle of fault diagnostics, programmable features & measurement of rate & data communication under networked environment.

This GATE Monitor (Type: NXG_ERM4 ) will be useful for monitoring Low Gamma dose rate levels in mR/hr working areas of Radio Isotope Laboratories, Radiotherapy departments, Medical & Industrial Radiological installations apart from its usefulness in Atomic Power Stations, radiochemical plants, waste immobilization plants etc., With power ON, initialization of SoC, peripheral devices, 5” TFT display/timers, counter etc, takes place. Followed by this, dose rate, calculation takes place in the selected unit such as mR/ hr. Additionally, hardware & fault diagnostic check will be carried out. Display updating will take place every 1 sec. Time constant (TC) for Doserate will be computed depending upon the detector output count rate.

Features

• Uses SoC, based on ARM Cortex A5 400MHz ,1.5MB SRAM,128MB Flash,extensive use of peripheral devices & Ethernet interface has been employed.
• Uses Microcontroller for counting radiation pulses, fault diagnostics, setting HV etc.
• Dose rate, range covered is (0.01 – 100) mR/hr by default, with option of selection of other three ‘units’ namely µSv/hr, CPS & CPM.
• Auto ranging & auto TC selection in the range of 30 sec to 0.5 sec depending upon detector count rate.
• 5” TFT display indication for dose rate, alarm status & configuration settings.
• Designed using GM tube type LND 713 or its equivalent.
• Large size WINDOW indication on TFT display for NORMAL & ACTIVE alarm condition.
• Alarm set point & ACK / RST through touchscreen.

Specifications

Radiation to be detected :	Gamma Radiation & X- Rays.
Range :	0.01 -100 mR/hr 0.1 – 1mSv/hr 0- 50000 CPM Range and Unit are configurable.
Detector :	Energy compensated Halogen -quenched G. M. Tube LND713 or equivalent having a sensitivity of 7.5 cps / mR/ hr .
Energy Response :	+/-25% from 100keV upto 1.25MeV.
Accuracy :	+/ – 10% Full scale with Cesium source.
EHT :	400V to 700V DC adjustable (Typical 500V) (factory set).
Display :	5”TFT is used for display of doserate, hardware status information & also for visualization of preset alarm and other parameters.
Overload :	Senses overload above 200% of full scale and upto 1 R/ h & indicates on display “OFL”.
Over-range :	Senses if the radiation field being measured has exceeded the measurement range of the instrument and upto 200% of the instrument and displays “OVR”.
Time Constant :	First Stable reading on Power ON within 1 min. Normal (Slow) : 30 sec to 0.5 sec automatically varying inversely with the radiation level.
Abrupt detection :	Update the current reading within 2 sec.
Calibration Accuracy :	+/- 10% through out the range.
Alarm range :	0.01 mR/Hr to 99.99 mR/hr. 0.1 µSv/Hr to 999 µSv/hr. 1-50000 CPM . The alarm level setting will be carried out through Radgrid Software by Ethernet Communication.
Alarm Indication :	a) Red Mimic flashing large area on TFT display. b) Loud alternating audio tone (Dual frequency tone).

Input Power : 230V AC +/-10%. Mechanical Enclosure: Size: 180H x 178W x 38D. Weight: 1Kg approx.