dose Badge Noise Dosimeters

The dose Badge is the actual noise dosimeter that mounts on the worker's shoulder. It has the following features:

• Strong alloy case, light weight and protecting
• Microphone and noise processor built in
• Rechargeable battery for low cost operation
• Memory for storing results and time history
• Infra-red interface to talk to the Reader unit
• Intrinsically safe option

Noise Measurements

The main noise measurements taken by the dose Badge depend on the settings and the regulations being followed:

• OSHA and related regulations: TWA, Lavg
• ISO 3dB and related regulations: Lep,d, Leq

The dose Badge noise dosimeters also measure, calculate and store other parameters, such as Dose %, Peak , and Pa2hr, which are needed for some noise exposure regulations.

The dose Badge has dual channels, and can have Channel 1 configured to have different exchange (doubling) rate, time response, threshold, criterion level and criterion time. Channel 2 is fixed to the common ISO 3dB settings. This means that you can work to regulations such as OSHA but still record the ISO parameters too.

The main measurement parameter (Lavg or Leq, depending on settings) is stored every minute, giving a graph of the sound level over time when downloaded to a computer. The C Weighted Peak is also stored every minute for similar graphing.

Noise Dose Exceedance Indicator

The dose Badge can be set to indicate when the noise dose has exceeded 100%. Under normal conditions, the blue LED flashes once every second. When the noise exposure limit is exceeded, it flashes twice every second.

Charging the dose Badge

All dose Badges in the kit can be charged at the same time. They are fitted onto the charging block as shown. A full charge from flat takes just 2½ hours. When the battery is not flat (usually the case) it takes less time. dose Badges can also be given a shorter "top-up" charge when needed at short notice (only on the latest generation of charger, released May 2007).

Mounting the dose Badge

There are a number of different mounts for the dose Badge, including the standard clip-mount (shown on left) and optional helmet mount. The mounting options are screwed onto the bottom of the dose Badge and then fixed to the workers clothing or helmet.