Ultra low lewel monitor, model 593

Produced by Overhoff Technology Corporation

Model 593 is sensitive only to tritium. A semipermeable membrane is used to isolate tritium oxide for passage into the instrument measuring system. All other sample constituents, including pollutants, radioisotopes, aerosols or particulates are removed and eliminated from the measurement.

Specifically designed to measure ultra low levels of tritium for compliance with 10CFR61 regulations, Model 593 measures to levels of 3x10-9Ci/m3, 100 Bq/m3

Ultra low lewel monitor model 593 (.pdf)

Technical specifications
(the Model 593 employs two balanced proportional gas flow counter tubes together with a diffusion permeation system for rapid ultra low level tritium specific measurements. The following specifications apply to the standard unit)

RANGE


 

0 to 2 MBq/m3 (0 to 50 μCi/m3)

DISPLAY

4 1/2 digit panel meter, in steps of 100 Bq/m3

RESOLUTION and NOISE LEVEL

100 Bq/m3, 1 S.D. (1σ)

TIME BASE, MEASUREMENT

 

10 minutes, pulses are accumulated (measurement repetion rate) over a 10 minute period

TIME BASE, BACKGROUND

100 minutes (or 10 minutes) pulses from the back ground compensation counter are averaged over a period as long as 100 minutes to enhance signal stability

MEASUREMENT,INTERFACE OUTPUTS

0 - 10 V, linear

logarithmic, 1 volt/decade

 

E to I, 4 - 20 mA, logarithmic 2 mA/decade
RS - 232

OPTIONAL DISPLAY FEATURES

chart recorder, logarithmic scale
totalizer integrates measurement

ALARMS, MEASUREMENT

Single alarm point, logarithmic scale

ALARMS, SUPERVISORY

sample flow failure
counting gas pressure loss
electronics failure

ALARM INTERFACE

fail safe relay closures
RS - 232

PROPORTIONAL COUNTERS

Dual copper clad acrylic counter tubes, 2 liter active volume, 2.5 liter wetted volume, 0.001 inch tungsten collector anode

COUNTER GAS

P - 10 or “MAGIC” gas for high performance Flow rate 250 cc/min, typical

TRITIUM COLLECTION

transfer via a polysulfone semipermeable diffusion membrane

SAMPLE FLOW SYSTEM

Oscillating piston pump, flow rate 5 lpm typical

FLOW METERS

front panel rotameters and LED failure displays for counter gas and sampling system

ENCLOSURE

19” relay rack, 48” highj. 24” deep approx, indoor use only

WEIGHT

less than 200 lbs

POWER

115/230V 50/60 Hz, 100 W max.

ENVIRONMENTAL

temperature +10°C to +30°C
humidity 0 - 95 % R.H.