Optical + gravimetric approach: The Microdust Pro performs instantaneous photometric measurements. With the optional gravimetric or size-selective adaptor, PUF filters, and an Apex2 air sampling pump, gravimetric samples can be collected from the same site aerosol; this generates a correction factor specific to the actual dust type, enhancing the representativeness of the photometric results.
NOVEL · Product and System Solutions
TSI Casella Microdust Pro CEL-712 Real-Time Dust Monitor
Occupational Safety and Environmental Measuring Instruments
Real-Time Dust Monitor • 0.001 mg/m³ – 250 g/m³ • Data Logging • Gravimetric Validation
Microdust Pro CEL-712is a professional, portable, data-logging laser photometer developed for real-time monitoring of the airborne mass concentration of dusts, fumes, and aerosols. Its ultra-wide measurement range of 0.001 mg/m³–250 g/m³, detachable probe, instantaneous/average/maximum display, and Casella Insight data analysis provide rapid on-site assessment for occupational hygiene, process control, and environmental dust investigations.
Technical Specifications
Technical Table
| Model | CEL-712/K1 Microdust Pro |
|---|---|
| Measuring Principle | Forward light scattering using a 635 nm visible red semiconductor laser |
| Measurement Range | 0.001 mg/m³ – 250 g/m³; 6 fixed/auto ranges |
| Resolution | 0.001 mg/m³ (in the 2.5 mg/m³ range) |
| Zero Stability | Typically <2 µg/m³/°C |
| Logging Interval | 1 second – 60 minutes |
| Memory | 86,000 data points / 500 measurement runs |
| Contact | USB; Casella Insight Data Management Software |
| Power supply | 3 × AA; external 12 VDC power option |
| Battery Life | Approximately 13 hours (dependent on operation and backlighting) |
| Operating Temperature | 0…55 °C, non-condensing |
| Dimensions / Weight | Instrument 172 × 72 × 33 mm; probe 35 × 205 mm; <600 g including batteries |
| Outputs | 0–2.5 VDC analogue; switched open-drain alarm <15 V / 500 mA DC |
| Laser Class | Class 1 Laser Product; within the scope of IEC/EN 60825-1 and 21 CFR 1040 |
Microdust Pro Product and Kit Images
Why Microdust Pro?
0.001 mg/m³ – 250 g/m³Wide dynamic range from low environmental levels to very high process dust concentrations, thanks to six measurement ranges and auto-ranging capability.
Real-Time Trend GraphDisplays instantaneous, average, and maximum values on a colour screen, helping to quickly identify during which tasks or processes dust peaks occur.
Detachable Measurement ProbeThe probe can be detached from the instrument for spot checks in ventilation ducts, process locations, and hard-to-reach areas.
PM10 / PM2.5 / RespirableSampling arrangements can be configured for health- and environment-relevant particulate fractions using optional size-selective adaptors, PUF filters, and a pump.
Gravimetric CalibrationA correction factor can be generated for the actual aerosol using an optional Apex2 pump and gravimetric adaptor, customising optical measurements to site dust.
Insight Data AnalysisTime history, peaks, processes, and measurement locations can be analysed with memory for 86,000 data points / 500 runs and USB data transfer.
PM10, PM2.5, Respirable, and Gravimetric Measurement
The standard probe of the Microdust Pro photometrically monitors total airborne aerosol mass concentration in real time. 206102B size-selective adaptor and appropriate PUF filters allow selection of PM10, PM2.5, or respirable fractions. 206101B gravimetric adaptor and an appropriate air sampling pump such as the Apex2 allow simultaneous filter sample collection.
This combination is particularly important for dusts with varying optical properties. The response of laser photometers can be affected by particle size, shape, density, and refractive index. Establishing a user-specific correction factor by comparing gravimetric results with photometric results improves measurement quality for a given process or dust type.
Standards, Literature, and Measurement Methodology
ISO 12103-1 A2 Fine Test Dust: The manufacturer performs factory calibration in a specialised wind tunnel using ISO 12103-1 A2 Fine test dust / Arizona road dust equivalent. Each probe has its own optical Calibration Insert to verify span response in the field.
ISO 7708 and EN 481form the basis in occupational hygiene for categorising airborne particles into health-related fractions such as inhalable, thoracic, and respirable. The optional size-selective adaptor system of the Microdust Pro enables field assessment of PM10, PM2.5, and respirable fractions.
NIOSH/OSHA gravimetric method approach: Direct-reading instruments are powerful for revealing dust peaks, high-exposure tasks, and the effectiveness of engineering controls in real time. When regulatory personal exposure or substance-specific analysis is required, appropriate filters, cyclones/samplers, calibrated air sampling pumps, and laboratory analytical methods must also be applied. The Microdust Pro is therefore not an alternative to gravimetric measurement, but rather a tool that accelerates on-site decision-making when used alongside it.
Static and Site Boundary Monitoring with Dust Detective
The Microdust Pro, an Apex2 air sampling pump, and a protective environmental enclosure can form the measurement core of the Casella Dust Detective system. This setup is suitable for evaluating real-time trends alongside gravimetric samples at construction/demolition sites, facility boundaries, and in short-term static monitoring studies. The manufacturer also supports PM10, PM2.5, and respirable fraction selection in the Dust Detective configuration.
Sectors and Applications
Occupational Hygiene and Exposure Investigations
Industrial Process and Filtration Control
Construction and Demolition Sites
Mining, Tunnelling, and Heavy Industry
Environmental and Boundary Dust Monitoring
R&D and Aerosol Research
Alternative and Complementary Products
Frequently Asked Questions About Microdust Pro
What is the measurement range of the Microdust Pro?
It operates across six measurement ranges between 0.001 mg/m³ and 250 g/m³, with auto-ranging capability available.
Can PM10, PM2.5, and respirable dust be measured?
Measurement setups for PM10, PM2.5, and respirable fractions can be configured using the optional size-selective adaptor, appropriate PUF filters, and an air sampling pump.
Can it be used alongside gravimetric sampling?
Yes. A filter sample can be collected using the gravimetric adaptor and a suitable pump to generate a correction factor for the actual dust being measured.
Is the Microdust Pro a personal dust dosimeter?
The Microdust Pro is primarily a handheld real-time field and area monitor. For wearable personal monitoring on workers, personal monitors such as the Gilian Dustlight or TSI SidePak are preferred; for regulatory gravimetric personal sampling, appropriate pumps and samplers should be used.
Brand and support in Turkey: NOVEL, Sole Authorised Distributor in Turkey for TSI / Casella — you can contact the NOVEL technical team for product selection, application consultancy, and gravimetric and real-time dust measurement solutions.
Notice: Technical specifications have been prepared based on TSI/Casella's current product page, operating manual, and technical data sheet. Photometric dust measurement response may be affected by the physical and optical properties of the aerosol. For regulatory exposure assessments, relevant standard sampling and laboratory analysis requirements must be independently verified.
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