- We used theTesto DiSCmini particle counter which is a commerically available device, validated for nanoparticle measurement in real time. The information below is Testo’s published product information
Testo DiSCmini Specifications
Typical applications of the DiSCmini include the determination of personal exposure in particle-contaminated workplaces (for example due to diesel soot, welding fumes and industrial nanoparticles) or in vulnerable groups (such as asthmatics or COPD patients). In addition to this, the testo DiSCmini offers various application possibilities in different disciplines of scientific research.
The small size of the testo DiSCmini makes the instrument particularly suitable for mobile on-site measuring tasks and the set-up of networks for the monitoring of ambient air. Thanks to the measurement rate with a time resolution of 1 Hz for all three measurement parameters, quick alterations in the aerosol number can be identified.
- Hand-held nanoparticle counter for measuring the number and average diameter of nanoparticles, with a time resolution of up to 1 second (1 Hz)
- Simultaneous recording of particle number concentration and particle size enables you to determine other characteristic parameters such as particle surface area (Lung Deposited Surface Area, LDSA)
| Nano Particle | |
|---|---|
| Particle size | 10 to 300 nm (Modal value)10 to 700 nm (absolute) |
| Particle concentration | 1000 to 1000000 Particle/cm³ (typical values)The evaluated particle concentration depends on the particle size distribution and the mean measurement time. |
| Accuracy | ±30 % typical for size and number ±100 Particle/cm³ absolute in number |
| General technical data | |
|---|---|
| Operating humidity | < 90 %RH, non-condensing |
| Weight | 700 g |
| Dimensions | 180 x 90 x 42.5 mm |
| Operating temperature | +10 to +30 °C |
| Battery life | 8 hours dependent upon local conditions |
| Power supply | 100-120 Volt o 200-240 Volt, 50/60 Hz (batteries) |
| Operating air pressure | 800 to 1100 mbar absolute ±20 mbar (Delta p max. on the air inlet) |
Experimental approach
The device was mounted at a fixed location in the clinical area being tested and was run continuously throughout each test.
Tests were repeated with the counter at different locations (up to 18 per location) to determine where aerosol concentration peaks within the clinical area.
The particle counter was then run with High Flow Local Extraction “on” and “off” during aerosol generation experiments and the results were compared side by side.
Each test was conducted only once the room had been cleared of detectable aerosols from the previous experiment, after an appropriate time period as determined by air changeover rates for the room in question.