Dust Measuring Instruments | Air Sampling Pumps

Two instruments are available from Casella Solutions to assist in doing air sampling as well as surveys of air borne particles in the workplace.


The Microdust Pro is a real-time hand-held, data logging instrument for the detection of airborne dusts, fumes and aerosols. It is ideal for walk-through surveys and for checking the effectiveness of control measures.

The current, third generation design remains popular in part because of its wide range from 0.001 mg/m3 to 250g/m3 which means that this versatile instrument can be used for applications ranging from walk-through surveys to testing local exhaust ventilation (LEV) performance. Its auto ranging feature means there is no need to set the range beforehand and risk an under or over estimation of the dust concentration. Another valued feature is its removeable probe, significantly smaller and lighter than the previous version, the two-part design meaning that the probe can be held in one hand and the main instrument body comfortably in the other, which itself is also smaller and lighter reducing the burden during field use.

The instrument is factory calibrated using a method traceable back to isokinetic techniques and is conducted in a custom-built wind tunnel using ISO 12103-1 A2 Fine test dust (Arizona road dust equivalent). Each probe is also supplied with its own unique Calibration Insert, which creates a known optical scattering effect in the probe’s sampling chamber. This fixed reference can be used to confirm the original factory calibration point, although annual factory recalibration is recommended.

While the Microdust Pro comes factory calibrated, by using an Apex2 Air Sampling Pump and gravimetric adaptor, user-defined dust-type settings may be obtained. This means that the user can calculate a correction factor for the actual type of dust being measured and ensures maximum accuracy for a particular application.


Casella APEX2 is the pump for carrying out personal air sampling where a known volume of air is drawn through a pre-weighed filter at a constant flow rate using a pump. Weighing the filter before and after sampling determines the mass of dust collected and by dividing that mass by the total volume of air drawn through the filter, an average airborne dust concentration is obtained for the sampling period.

All three models of Apex2 (Standard, Plus & Pro) are approved as standard to Ex ia IIC T4 Ga, Ex ia IIIC T135°C Da and Ex ia I Ma specifically for mining applications.

The ergonomic design of the pump is the culmination of many years of experience by Casella as well as important customer feedback. This has resulted in the overall shape of the pump –a square form for more comfort; the position of the screen –on top instead of side for added protection; and a recessed inlet nozzle and a protective rubber boot for further protection.

The addition of Bluetooth® connectivity allows you to remotely monitor (on APEX2 Plus and Pro models) using the supporting Airwave software application on your phone or tablet and means you can view multiple pumps (and noise dosimeters) simultaneously without disturbing the wearers, to start and stop them remotely and to email data direct to your PC.

The Microdust Pro and APEX2 are available from Stantron. Contact Stantron for details.


All rights reserved by Casella Solutions who are the original publisher.

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