BAI 9128 Moving Filter Monitor

The BAI 9128 moving filter monitor is an easy transportable monitor intended for the measurement of α- and β-particulates. The BAI 9128 features a compact design and high performances, similar to those obtained with stationary monitors operating at higher flow rates. The unit runs without maintenance for prolonged periods.

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Features

Detection limit according DIN 25482, at 1 h collection and measuring time for β < 0.04 Bq/m³ for α < 0.004 Bq/m³
Si-CAM- detector 600 mm² for simultaneous α-β-measurement
Compensation for natural activity
Measurement of ambient dose rate
Measurement of natural activity (Radon - Thoron progeny)
Separate warning beacon with 10 m cable
Selectable filtertape advance speed (5, 10 mm/h)
Filtertape autonomy up to 10 months, filter change warning before end of tape
Pump unit with flow low check
Low pump noise level

Details

The BAI 9128 moving filter monitor collects and measures air from rooms, ducts or the environment for the presence of Alpha and Beta particulates.

The compact design integrates a sampling head with detector, the pump unit and the control electronics in a standard 19” cassette.

An S-class glass fiber filter-tape collects the sample air particulates. This filter-tape advances at a programmable continuous speed eliminating the need for frequent filter replacement due to dust loading.

A rugged Silicon detector allows to measure both Alpha and Beta particulates. The Silicon detector is installed above the dust collection area at close distance to the filter, and delivers optimal Alpha & Beta counting performance. Radon progeny is eliminated from the gross Alpha Beta activity using Pseudo-coincidence gating or Beta/Alpha ratio compensation methods. Downstream of the filter a silent pump unit ensures a stable flow rate of 3 m³/h.

As evaluation electronics the data logger LB 5340 as well as the LB 5310 or LB 9000 could be used. The electronics allows the user to measure the presence of radioactive aerosols as well as the ambient dose rate and to trigger alarms above certain levels. The healthy status of the overall system is continuously monitored.

Specifications

Filtercassette
Structural shape	19”cassette 6HU IP20 483 x 264 x 320 mm³ elapsed hour counter flow low filter trouble indicators (led) fast filter advance pushbutton reset filter timer push button plexi door for access wetted parts
Dust collectionarea	25 x 25 mm²
Wetted parts mat´l	Ni plated brass to MIL stdrd
Construction mat´l	Alum side & back plate, plexi cover front
Sampling section from inlet to filter	to DIN 25423 (06/96) stainless steel RS 316L
Pressure	Ambient Sample	940 – 1100 hPa –150 mbar to atm. pressure
Temperature	Ambient Sample	0 to +40 °C -20 to +40 °C
Humidity	Ambient Sample	0 – 95 % RH non condensing 0 – 95 % RH non condensing

Filter
Type	Glas fibre Particulates filter to DIN S&S N° 10, roll 40 m x 50 mm, core 25 mm dia
Advance	continuous speed selectable 5/10 mm/h fast 500 mm/h pushbutton frontpanel
Autonomy	> 10 months at 5 mm/h speed
Controls	Filter ruptured, Filter supply low (< 3 m)

Pump Unit
Pump	low maintenance (> 10 000 h) silent operation (< 55 dB(A) at 1 m) pump head max -440 mbar typical operating -160 mbar
Flow rate	typical 3.3 m³/h at NTP
Controls	pump head pressure switch (flow low) typical set point 3.2 m³m/h at NTP

Alpha-Beta Detector
Type	Si-CAM 600 m² light tight
Typical efficiencies solid sources	Alpha	²⁴¹Am	20 % / 4 pi
	Beta	³⁶Cl ⁶⁰Co	25% / 4 pi 10% / 4 pi
Energy range (preamp threshold setting)	Beta Alpha	100 keV - 2 MeV 3 MeV - 9 MeV
Background in system	Alpha Beta	< 0.002 cps < 0.2 cps
Leadshield	2 cm / 4 pi
Ambient gamma sensitivity	Beta channel < 0.4 cps per µSv/h ¹³⁷Cs radiation

Preamplifier
Type	LB 2029 preamplifier with built-in dual pulse height discriminator

Alarm Unit
Type	LB 9128-ALARM, green system healty lamp, yellow, red, blue flashing lamps, resetable horn 90 dB(A) at 1 m
Lamps	ba 15d/230-260V/5 - 7 W
Functions	Reset horn, lamp test pushbutton
Connections	mains 230 VAC connector, remote signals DIN T 3406 6 pole male

Overal Electrical Specifications
Mains	230VAC/50 Hz/Single phase, I nom 1 A, Fuse : 1.6A T, thermal safety 1.3A

Applications

General Applications
All applications where airborne α and β particulates radioactivity has to be measured. To prevent personnel exposure. To measure release rates in ducts and stacks.

Decommissioning
Nuclear power
Source manufacturing
Industrial safety
Research

Specific Applications
In hostile environments where a moving filter monitor has advantages:

Workplace or stack monitoring with high dust concentrations

Decommissioning with abrasive material removal
Titrituration process monitoring
Phosphate manufacturing
Waste disposal sites
Fuel reprocessing

Where space is at a premium

Mobile labs
Intervention vehicles

Where movable intervention equipment is needed

On the spot monitoring
Temporary access gates to contaminated areas

Download

Brochure
		Format	Size
BAI 9128	en	PDF	294.64 KB

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BAI 9128 Moving Filter Monitor

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