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.

Read More

full body foto of LB 91281

LB 9140 the filter monitor zoomed

Filter Monitor

Technical Data

Filtercasette  
Structural shape300 x 300 x 530 mm³ (W x D x H)
Dust collection area25 x 25 mm²
Construction materialalum 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 ratetypical 3.3 m³/h at NTP
Electronics 
Type

data logger LB 5340

(Refer to LB 5340 Flyer)