The Model 593 is the most sensitive tritium in air monitor that we offer and is designed for accurately measuring ultra-low levels of airborne tritium through use of a balanced pair of proportional counter detectors. The Model 593 is sensitive to only tritium, a Nafion dryer (selectively permeable membrane) is used to isolate tritium oxide before measurement; all other sample constituents, including pollutants, radioisotopes (i.e., noble gases), aerosols, and particulates are removed and eliminated prior to measurement. For measuring total tritium (HT + HTO), a catalytic oxidizer can be included to convert elemental tritium to tritium oxide. The 593 features a large, color touch-screen LCD display and is housed inside an industrial IP-54, NEMA-13 rated cabinet with a polycarbonate window door and key locking latch on door. Custom software allows you to view configure alarm settings, generate graphs, view trends, monitor and display malfunction and alert conditions, and log all data and events.
The 593 uses both electronic signal processing and a second, sealed proportional counter to eliminate the effects from external gamma fields. 1” lead shielding around the counter tubes further reduces background gamma and improves the statistical signal to noise ratio to enhance sensitivity.
This instrument requires a supply of P-10 gas for the operation of the proportional counting detectors. Suggested cylinder size: 8.5 m3 (300 ft3), regulator set to a minimum of 50 kPa (7 PSI) and maximum 55 kPa (8 PSI).
Note: Model 593 requires approximately 40 minutes to reach 90% of the final value due to filtration of the tritium through the Nafion dryer. If a faster response time or wider range is required, then please refer to Model 593.2 which utilizes a dual measurement system to provide a faster response time when tritium concentrations exceed 1 MBq/m3.
|RANGE||a) 1 to 10,000 kBq/m3|
b) 0.01 to 100 μCi/m3
|RESOLUTION||0.1 kBq/m3 (0.003 μCi/m3)|
|SENSITIVITY||1 kBq/m3 (0.01 μCi/m3)|
|DISPLAY||10” Color Touch-Screen LCD|
|TIME RESPONSE||40 minutes to reach 90% of final value|
|MEASUREMENT, INTERFACE OUTPUTS||i) 0 – 10 V, linear|
|PROPORTIONAL COUNTERS||Balanced pair of copper clad acrylic counter tubes, 1.5 liters total volume each, surrounded by 1” of lead shielding|
|ALARMS, MALFUNCTION||i) instrument air low flow iv) oxidizer temperature|
ii) P-10 gas low v) low sample flow
iii) chamber or power supply malfunction
|ALERT CONDITIONS||Background high level, tritium loss of signal, background loss of signal, tritium low counts, and background low counts|
|ALARM CONDITIONS||i) Tritium alert level|
ii) Tritium high level
|ALARM INTERFACE||i) fail safe relay closures|
|COUNTER GAS||P – 10 (90% Argon, 10% Methane)|
Supply pressure: 10-14 PSIG (69-97 KPa)
Usage: 400cc per minute @ atmospheric pressure
|SAMPLE FLOW SYSTEM||Brushless Dual Bearing Diaphragm Pump, flow rate 5 lpm typical|
|FLOW METER||P-10 Gas Flow & Instrument Air Flow Adjustable 0-500 cc/min, Manual set-point 400cc/min|
|MASS FLOW METER||Sample Flow, range 0-250 cc/min, electronically controlled set-point 200cc/min|
|SIZE||70.9” [1800mm] High x 23.3” [600mm] Wide x 23.3” [600mm] Deep floor mounted painted steel enclosure with polycarbonate window door and key locking latch on door. Rear hinged door and hinged side panels. IP-54, NEMA 13 Rated|
|WEIGHT||530 lbs (240 kg)|
|POWER||115/230V 50/60 Hz, 100 W max.|
|ENVIRONMENTAL||temperature: 5° C to 40° C humidity: 0 – 95 % R.H.|