Type 4448

Noise dosimeter

A personal noise dosimeter that simultaneously measures all parameters required by noise at work standards.


This shoulder-mounted, cable-free, personal noise dosimeter has a simple two-button operation, an informative LCD display and an auto-calibration function. Its built-in memory and rechargeable battery provide several working days of measurement.


  • Assessment of noise exposure at work
  • Occupational noise evaluation (OH&S)
  • Daily ”noise watchdog”
  • Selection of hearing protection

The personal noise dosimeter is available in a standard and ATEX-approved version. Both instrument variants simultaneously measure LAeq and LCeq. Using the Noise Reduction Rating (NRR), Single Number Rating (SNR) and/or High, Middle, Low (HML) rating method, appropriate hearing protection can be selected directly from the measured data.

The LCD display clearly shows remaining battery and memory capacity, key parameters during measurements, and even lets you review data from the most recent measurement.

Measuring all relevant noise parameters simultaneously, the noise dosimeter removes the need to perform setup tasks. Interchangeable mounting clips provide the best fit to suit the wearer's activity and clothing.

Measurements from Type 4448 can be downloaded into B&K 2245 Work Noise Partner for personal noise exposure calculations, archiving and reporting.


  • 180 hours logging storage: LAeq, Lav, LZpeak and LZpeak at 1 minute interval
  • Peak counting (135, 137 and 140 dB level exceedance)
  • Pre-set measurement time up to 12 hours
  • LCD display for measurement review on instrument, battery and memory status
  • Keys and display lock function
  • LED warning alarm for dangerous sound level
  • Rechargeable NiMH battery giving 28 hours of operation time

Multiple-unit kits make it easy to assess noise exposure for many workers. The lightweight and convenient kit case has space for up to 10 noise dosimeters, two chargers, one power supply, one calibrator and other accessories.

Upcoming courses and webinars

1 Hour Introduction to Shaker Based Vibration Testing 英語 14 Nov 2019 Free Read more
1 hora Control de Vibraciones III. Choque スペイン語 15 Nov 2019 Gratuito Read more
1 STUNDE Neuigkeiten in BK Connect 2019 Strukturdynamik und PULSE OMA ドイツ語 18 Nov 2019 Kostenlos Read more