Digital Entrance/Exit area Monitor

Features

• Detects gamma radiation
• 0.1 mR/hr – 1 R/hr range
• Digital display
• Includes two wall-mount NaI (Tl) scintillation detectors with enclosures and cables
• Separate LOW and HIGH alert/alarm with yellow/red lights, adjustable audible tones
• Detector failure light and tone to signal detector overload or instrument failure
• Low battery warning
• Threshold adjusts from 2 to 100 mV
• Battery continuously trickle charges when unit is operating and connected to wall current

This Area Monitor serves as a radiation sentry/alert for building entrances, halls, and doorways. Equipped with a pair of NaI (Tl) scintillation detectors that mount on both sides of a doorway or hall, the unit continuously monitors incoming and outgoing materials and people for low-level gamma radiation. Typical applications are the monitoring of areas where waste material leaves departments or buildings, and monitoring emergency room entrances in the event of radiation-related emergencies. The Area Monitor can be set to give a visual and/or audible alert (yellow light, slow beep) when a selected background level has been exceeded, and give an alarm signal (red light, fast beep) when a selected radiation level is reached. Lights and audibles also indicate detector overload, no count from detectors, or instrument failure. A yellow LED illuminates when the battery has less than 2 hours of power remaining. The monitor is wall-mountable. Two 25-foot detector connection cables are included.

Specifications

• Detectors (2): 3" dia x 1" thick (7.6×2.5 cm) shielded NAI (Tl) scintillation detectors in NEMA4x enclosures
• Display: Four-digit LED display with 0.8" (2 cm) character height
• Display Units: Can be made to display in µR/hr, mR/hr, R/hr, µSv/h, mSv/h, Sv/h, µrem/hr, mrem/hr, rem/hr, cpm, cps, and others
• Linearity: Reading within ±10% of true value with detector connected
• Response: Typically three seconds from 10% – 90% of final reading
• Status: (green light) instrument functioning properly
• Alarm: Low Alarm – indicated by yellow light and slow beep (one per second) audible tone (can be set at any point from 0.0 – 9999); High Alarm – indicated by red light and fast beep (four per second) audible tone (can be set at any point from 0.0 – 9999); NOTE: Audible indicators can be configured as a single beep if desired
• Det Fail: Detector overload, no count from detector, or instrument failure Ð indicated by red light and audible tone (greater than 68 dB at 2 feet)
• Low Bat: (yellow) indicates less than two hours of battery power remaining
• High Voltage: Adjustable from 200 – 2500 volts
• Threshold: Adjustable from 2 – 100 mV
• Dead Time: Adjustable to compensate for dead time of detector and electronics (can be read on display)
• Overload: Senses detector saturation (indicated by display reading :"OL")
• Overrange: Indicates radiation field being measured has exceeded counting range of instrument (indicated by display reading "- – – -")
• Data Output: Nine-pin connector providing five decade logarithmic output, RS-232 output, signal ground connection, FAIL and ALARM signals (current sink), and direct connection to battery and ground
• Calibration Controls: Accessible from front of instrument (protective cover provided)
• Power: 115 VAC; 220 VAC or battery power
• Battery Life: Typically 48 hours in non-alarm condition, 12 hours in alarm condition
• Battery Charger: Battery is continuously trickle charged when instrument is connected to line power and turned on
• Battery Dependence: <3% change in readings to battery endpoint
• Monitor Construction: Wall mount aluminum housing with ivory polyurethane enamel paint
• Dimensions:
  • Monitor electronics unit: 7.4" h x 9.7" w x 2.5" depth (18.7×24.6×6.4 cm)
  • Detectors (each): 13" h x 17" w x 8.5" l (33×43×22 cm)
  • Connecting cables (each): 25-foot, type "C" connector a
• Weight:
  • Monitor electronics unit: 6.5 lb (2.3 kg)
  • Detectors (each): 32 lb (14.5 kg)

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