Highlights
General
- Direct measurement of artificial alpha/beta radioactivity with compensation of radon products by ABPD & AED compensation method
- Transportable monitor with small footprint
- Si-CAM detector unit 600 mm² for simultaneous separate alpha/beta measurement
Features
- Continuous filter operation with 4 selectable speeds from 5 to 15 mm/h, warning before paper end
- Step filter operation optionally possible
- Low-noise and low-maintenance pump unit with failure monitoring
Self-Checking & Alarming
- Monitoring of the pump function
- Monitoring of the filter tape
- Detector failure threshold alpha and beta (and gamma if installed)
- Pre-Alarm threshold alpha or beta
- Alarm threshold alpha or beta
- Lamp test
Product Overview
LB 9140
Monitoring concept
The particulates monitor LB 9140 is used to measure airborne Alpha-/Beta particulates in the presence of naturally occurring (Radon) activity and fluctuating gamma backgrounds.
The portable monitor consists of following main building blocks:
- Dust collection unit 9128µ: allows the prompt measurement of radioactive Alpha-/beta particles using Si-CAM detector
- Prompt Alpha-/Beta detector: measures directly on the collection area to have a real time monitoring system
- Cassette: made of aluminum with protection degree IP68 envelopes the dust collection unit, filter supply and take-up spools. A plexi-glass front door allows visual inspection of the filter supply on the feed spool.
The filter advance is driven by a stepper motor unit, which allows continuous advancement of the filter tape at user selectable speeds (5/10/12.5 and 15 mm/h). Alternatively the filter can be advanced in step wise mode with user selectable time intervals.
Technical Data
Filtercasette | |
Structural shape | 300 x 300 x 530 mm³ (W x D x H) |
Dust collection area | 25 x 25 mm² |
Construction material | alum side & back plate, Plexiglas cover front |
Filter | |
Type | glass fiber particulates filter to DIN Whatman N° 10 roll 12 m x 50 mm, Core 25 mm diameter |
Autonomy | > 3 months at 5 mm/h speed |
Pump Unit | |
Pump | low maintenance (> 10.000 h) silent operation (< 60 dB(A) at 1 m) pump head max. -440 mbar typical operating -160 mbar |
Flow rate | typical 3.3 m³/h at NTP |
Electronics | |
Type | data logger LB 5340 (Refer to LB 5340 Flyer) |