Features:
Description:
The Model 357BW is a single-range ionization chamber tritium in air monitor contained in a NEMA-12 enclosure suitable for permanent installation and continuous duty. It is designed for the monitoring of rooms, glove boxes, fume hoods, exhaust stacks, as well as process piping. The enclosure has a hinged door with a tempered glass window and is also double-hinged so that the inside components can be easily serviced. The Model 357BW has an upgraded alarm system, including: high-level alarm (latching or non-latching), malfunction alarm (internal DC power supply or electrometer failure), and low flow alarm. Exceptionally stable with accuracy and reproducibility of ±5% over the entire measurement range.
Dual 2L or quad 2L ionization chambers are available, with optional plate-out proof wire-grid electrodes to reduce tritium or other radioactive gas contamination by up to 1000x. Quad 2L ion chamber assembly arranged in a cruciform geometry provides the best sensitivity, stability, and omnidirectional gamma compensation.
RANGE | Typical Measurement Ranges: a) 1 to 19,999 μCi/m3, MDA is 1 μCi/m3 b) 0.01 to 199.99 MBq/m3, MDA is 0.03 MBq/m3 c) 0.1 to 1,999.9 MBq/m3 or DAC where 1 DAC=10μCi/m3 d) 1 to 19,999 μSv/h, MDA is 1 μSv/h Extra-sensitive option with quad 2L chambers: e) 0.1 to 1,999.9 μCi/m3 , MDA is 0.5 μCi/m3 |
DISPLAY | Digital Meter, 4 ½” digit LED |
ACCURACY | ±5 % of reading, ±1 μCi/m3, whichever is greater |
REPRODUCABILITY | ±5 % across the entire measurement range |
STABILITY AND DRIFT, LONG TERM | ±1 μCi/m3, over the entire temperature range |
TEMPERATURE COEFFICIENT | less than ±0.3%/°C, total accumulated error ≤±10% relative to 20 °C reading |
NOISE | ±1 μCi/m3, 2 sigma, with 20 second time constant |
GAMMA COMPENSATION | second ion chamber of equal volume, mounted coaxially for dual chambers, or in a cruciform arrangement for quad, serves to cancel effects of external gamma fields |
RESPONSE RATE | two linear time constants 20 seconds for measurements below 80 μCi/m3 3 seconds for measurements above 80 μCi/m3 |
ALARM SYSTEM | -single level alarm, with adjustable set point -mode switch: latching or non-latching operation with a momentary reset position -low flow alarm: differential pressure switch, activates audible and visual alarm -system failure alarm: high or low voltage out of tolerance and electrometer failure -acknowledge push button, silences the audible indicator for all above alarms |
INDICATORS | acoustic signaler, red LED |
IONIZATION CHAMBER VOLUME | dual 2L (measuring: 1,800cm3, total wetted: 4,000cm3), or quad 2L (measuring: 3,600cm3, total wetted: 8,000cm3) |
FLOWMETER | 0-10 LPM adjustable rotameter |
DUST FILTER AND PUMP | high efficiency 99.99% at 0.1 microns HEPA respirator type cartridge long-life oscillating piston positive displacement pump |
ENVIRONMENTAL | storage: -40° C to +65° C, operating: 0° C to +55° C, 0 to 95 % R.H. non-condensing ventilation or air conditioning not required |
POWER | 120 VAC or 240VAC, 50/60 Hz |
DIMENSIONS | 24.0” [610mm] Wide x 19.0” [483mm] Long x 24.0” [610mm] High wall-mount NEMA-12 rated enclosure |
FUSE | 1 A slow blow fuse |
WEIGHT | 160 lbs. [73 kg] |
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