Monitor for ultra sensitive detection of airborne radioactive gases Model 347

Produced by Overhoff Technology Corporation

A very high sensitivity general purpose monitor for reliable measurements to as low as 0.5 μCi/m3 in the presence of significant external gamma fields.

OTC Model 347 tritium monitor will not respond to ambient radon, this instrument is fast, accurate and

has long term zero stability. This monitor is a simplified, lower cost, version of the 300 series instruments, but with a restricted number of available optional features. The quadruple chambers are Kanne type arranged in a cruciform pattern. A separately mounted pump system with HEPA and ULPA filters assures a sample free of particulates.

Monitor for ultra sensitive detection of airborne radioactive gases Model 347 (.pdf)

Optional equipment available:

  • Remote Alarm Units
  • Remote Meter Displays
  • Tritium Gas Calibrator
  • Calibration Resistor
  • 4-20 mA Output
  • Logarithmic Output
  • RS232 Output

Technical specifications

MEASUREMENT

Tritium in Air Concentration

 

RANGES single, 0.1 to 1999.9 μCi/m3

DISPLAY

Digital Meter, 4½” digit LED

ACCURACY

±10 % of reading, ±1 μCi/m3, whichever is greater

STABILITY AND DRIFT LONG TERM

±1 μCi/m3, ambient temperature

NOISE

<1 μCi/m3, 2 sigma, with 30 second time constant

GAMMA COMPENSATION

second ionization chamber pair of equal volumes, mounted in cruciform pattern, serves to cancel effects of external gamma fields

RESPONSE RATE

two linear time constants, 30 seconds for <80 μCi/m3

ELECTRONIC

3 seconds for >80 μCi/m3

WARM-UP TIME

less than 5 minutes required for high voltage power supplies to stabilize

ALARM SYSTEM

single alarm, with set point adjustable from 1 to 1000 μCi/m3

IONIZATION CHAMBER

measuring: 2900 cm3

VOLUME

total wetted: 4000 cm3

ENVIRONMENTAL

Storage Temperature: -40° C to +60°
Operating Temperature: 0° C to +50° C
Humidity: 0 to 95 % RH non-condensing

PHYSICAL CABINET

Bench top, frame constructed of aluminum extrusions, front and rear panel

POWER

115 VAC or 240 VAC 50/60 Hz

DIMENSIONS

223 mm H x 483 mm W x 406 mm D

WEIGHT

20.4 kg

FLOWMETER

0 -10 LPM adjustable rotameter

DUST FILTER and PUMP

separately mounted

POWER

115 VAC or 240 VAC 50/60 Hz

DIMENSIONS

178 mm H x432 mm W x 406 mm D

WEIGHT

9.1 kg