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Bergerhoff Gauges
The Bergerhoff Gauge is a reliable instrument for measuring dust deposition on-site, typically expressed in mg/m²/day. It features a 1.5-liter PET collection bottle with a 90mm diameter neck, allowing for accurate dust collection.
Our Bergerhoff Gauge kit includes a plastic-coated stand, bird guard, bottle holder, and spare PET bottle. Designed according to German standard VDI 2199, it ensures durability in harsh environments. Additional features include an optional sticky pad adaptor for directional sampling and guy rope attachments for extra stability.
Why choose Normec?
Effective Data Management System
Manage your air monitoring data on one system, providing an intuitive interface for easy access, sample media tracking, online reporting, accounts and invoicing (currently only available to Normec i2 Analytical air testing division)
Comprehensive Testing Service
Extensive in-house capability to carry out occupational hygiene, soil vapour via thermal desorption, summa canisters and ambient air analysis including hire and sell of dust deposition gaugues.
Dedicated Logistics
Peace of mind that your samples will be collected and delivered safely and reliably.
FAQ
All the most frequently asked questions
A deposit gauge measures dust deposition, meaning the amount of dust settling from the air onto a surface. In contrast, a directional gauge measures dust flux, which refers to the horizontal movement of wind-blown dust. Dust flux is calculated as the product of airborne particle concentration and wind speed, expressed as mass per unit area per unit time. Unfortunately, this can cause confusion, as dust flux and dust deposition share the same units.
It is not possible to convert directional gauge readings into deposition rates. This would require knowledge of particle size, concentration, and wind velocity components, most of which are unknown. Additionally, the gauge’s efficiency varies, as airflow stagnation near the aperture affects how particles enter the collection tube.
To analyse a sample, first remove the bottle of dirty water from site, ensuring any dust on the collectors is rinsed into the bottle. For Frisbee gauges, include the foam particle trap and rinse it. Filter the sample through a sieve to remove large debris, then pass it through a pre-weighed filter. Dry the filter then reweigh it to determine the dust mass.
In summer, algae can clog filters, slowing the process. To reduce algae growth, cover the sample bottle with a lightproof material. If there's a large volume, let the sample settle before filtering to speed up the process and minimise filter clogging. For less precision, decant the supernatant liquid, but ensure dust loss is minimal.