LB 9140 – Alpha/Beta Moving Filter Monitor
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Service & reparation Offertförfrågan- Si-CAM detector unit 600 mm² for simultaneous separated Alpha-/Beta measurement on a flat dust collection area of 25 x 25 mm²
- Direct measurement of air borne alpha-beta activities with radon compensation (ABPD & AERD)
- Optional gamma compensation-detector
- Integrated alarm functions (pump, filter paper, thresholds, signal column, etc.)
- High air flow of 3.3 m³/h
- Filter tape autonomy up to 3 months at 5 mm/h velocity
- Transportable due to low weight (approx. 43kg) and small dimensions
With the mobile moving filter monitor LB 9140 airborne alpha and beta activities in room and exhaust air can be monitored with high sensitivity. Due to the silent and low maintenance pump unit an air flow rate of approx. 3.3 m³/h is possible.
The portable monitor consists of following main building blocks:
Dust collection unit 9140µ
allows the prompt measurement of radioactiv particles emitting alpha or beta 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.
Pump Unit: with linear motor-driven Free Piston System (Pat.) has an internal piston inside the cylinder which is driven by an electro-magnet and spring system controlled by the alternating input current cycle. The system is quiet and vibration free, and offers the advantages of easy maintenance and a long operating life. The nominal flow is 3 m³/h with a noise level of max. 60 dB(A) at 1m. Optionally a flow meter can be offered.
Si-semiconductor Alpha-/beta detector
with 600 mm² surface and ruggedised entrance window for simultaneous, separate measurement of Alpha- and Beta activities. The detector analog signal is converted in the LB2029-40 amplifier unit into 3 norm pulse signals and an analog output suited for spectroscopy (ADC) input.
Optional second Si-semiconductor detector
with 600 mm² (or 150 mm²) surface can be used for ambient gamma radiation compensation. This guard detector is mounted on top of the prompt Alpha-/Beta detector to obtain identical geometry and the analog signal is converted in the LB2029-41 dual amplifier unit.
Analog/Digital counting electronics
LB 5340 data logger unit process the signals coming out of the amplifier. The electronics makes use of intelligent front end analog/digital modules and communicates with these via internal CAN-Bus. LB 5340 contains 3 intelligent front end modules:
- Pseudo coincidence board ABPD
- Multi I/O board
- 8 fold Relay board
The monitor is equipped with self-check routines that continuously monitor the system health and alarm status:
- 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
Datablad
Kontakt
Göran Jonsson
- Försäljningschef, KAM
- Telefon: +46 (0)18-56 68 20
- Mobil: +46 (0)70-622 04 07
- goran.jonsson@gammadata.se
Teknisk specifikation
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Filtercassette |
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Structural shape |
300 x 300 x 530 mm³ (W x D x H) |
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Dust collectionarea |
25 x 25 mm² |
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Wetted parts mat´l |
Ni plated brass to MIL stdrd / stainless steel |
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Construction mat´l |
Alum side & back plate, plexi cover front |
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Sampling section |
to DIN 25423 (06/96) stainless steel RS 316L |
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Pressure |
Ambient |
650 to 1100 hPa |
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Temperature |
Ambient |
-15 to +40 °C |
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Humidity |
Ambient |
0 – 95 % RH non condensing |
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Filter |
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Type |
Glas fibre Particulates filter to DIN Whatman |
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Advance |
continuous |
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Autonomy |
> 3 months at 5 mm/h speed |
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Controls |
Filter ruptured, Filter supply low (< 3 m) |
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Pump Unit |
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Pump |
low maintenance (> 10 000 h) |
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Flow rate |
typical 3.3 m³/h at NTP |
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Controls |
pump head pressure switch (flow low) |
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Alpha-Beta Detector |
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Type |
Si-CAM 600 m² light tight |
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Typical efficiencies
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Alpha |
241Am |
25% / 4 pi |
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Beta
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36Cl 60Co
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25% / 4 pi
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Energy range
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Beta Alpha Alpha Nat. |
100 keV – 2.5 MeV 2.5 MeV – 10 MeV 7 MeV – 10 MeV |
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Background in system
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Alpha Beta |
< 0.02 cps < 0.2 cps |
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Leadshield |
2 cm / 4 pi |
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Ambient gamma sensitivity |
Beta channel |
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< 0.4 cps per µSv/h 137Cs radiation front |
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Guard Detector |
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Type |
Si-CAM 600 mm² light tight |
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Background in system |
Beta window < 0.2 cps |
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Ambient gamma sensitivity |
Beta channel < 0.6 cps per µSv/h 137Cs radiation front |
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Preamplifier |
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Type |
LB 2029-40 (one detector) / |
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Electronics |
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Type |
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Enclosure LB 9140 / LB 5340 |
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Dimensions |
530 x 300 x 300 mm³ (H x W x D) |
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Weight |
approx. 43 kg incl. pump and cart |
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Cart |
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Dimensions |
approx. 1035 x 420 x 395 mm³ (H x W x D) |
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Alarm Unit |
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Type |
LB 9140-ALARM, green system healty lamp, orange, red flashing lamps, resetable horn 90 dB(A) at 1 m |
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Lamps |
LED´s 230 VAC WERMA |
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Functions |
Reset horn, lamp test pushbutton |
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Connections |
mains 230 VAC connector, |
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Overal Electrical Specifications |
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Mains |
230VAC/50 Hz/Single phase, I nom 1 A, |
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