A portable dust sampler is a mobile device that collects airborne particles for air quality analysis and workplace safety monitoring. It uses a pump to draw in ambient air and capture dust on a filter, allowing for the quantification of particulate matter to assess worker exposure and environmental compliance. These devices can be compact, battery-operated, or mains-powered and are used in various settings, from construction sites to laboratories.
Function and purpose
Air quality monitoring: Used to measure the concentration of airborne dust and other pollutants in real-time or for later analysis.
Workplace safety: Helps ensure compliance with occupational health and safety regulations by monitoring worker exposure to hazardous dusts.
Environmental assessment: Assists in evaluating the overall air quality in a given environment.
Gaseous pollutant analysis: Many models can also be configured to monitor for gaseous pollutants like
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Key features
Portability: Designed for mobility, with features like lightweight construction, compact cases, and battery power for on-site use.
Pump system: A pump draws air into the sampler at a specific flow rate.
Filtration: Particles are captured on a filter, often a filter paper of a specific diameter like 25mm or 47mm, for later analysis.
Flow control: Equipped with a rotameter or other mechanisms to adjust and maintain a consistent airflow during sampling.
Microcontroller and timer: Many modern samplers have a microcontroller for timer-based operation and automatic shutoff.
Digital display: Provides a digital readout of the timer and sampling time.
How it works
The sampler's pump draws a known volume of air through a filter medium.
Airborne particles are collected on the filter.
For gravimetric analysis, the filter is weighed before and after sampling. The difference in weight determines the mass of dust collected.
The concentration of dust in the air is calculated by dividing the mass of the collected particles by the volume of air sampled.
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