Piezobalance Dust Monitor 3520 Series
Direct-reading aerosol mass monitors that electrically deposit particles on a piezo-crystal and determine mass concentration from the resulting frequency shift—especially useful for oil mist and workplace particulate monitoring.
Model Overview
| Model | Impactor / fraction | Measuring range | Best fit |
|---|---|---|---|
| 3521 | 10 µm and 4 µm impactors | 0.01–5 mg/m³ | PM10, respirable particulate and oil-mist monitoring |
| 3522 | 2.5 µm impactor | 0.01–10 mg/m³ | PM2.5 and fine-particulate monitoring |
Key Features
Direct mass measurement
Measures deposited particulate mass through the frequency shift of a piezoelectric crystal rather than deriving mass only from particle counts.
Interchangeable size selection
Model 3521 includes 10 µm and 4 µm impactors; Model 3522 uses a 2.5 µm impactor.
Real-time concentration display
Provides immediate particulate mass-concentration readings during surveys and process checks.
Oil-mist measurement fit
The direct deposition method is particularly suitable for monitoring oil mist and similar workplace aerosols.
Data logging
Stores 500 time-stamped measurements and transfers data through RS-232C.
Serviceable measurement path
Includes a cleaning mechanism and cleaning kit for routine maintenance of the piezo-crystal system.
Technical Specifications
| Parameter | Unit | Value / Description |
|---|---|---|
| MODEL 3521 | ||
| Measured particle range | µm | 0.1–10 |
| Impactors | µm | 10 and 4 |
| Mass-concentration range | mg/m³ | 0.01–5 |
| Accuracy | — | ±10% of reading ±1 digit from 0–5 mg/m³; ±20% of reading ±1 digit from 5–10 mg/m³ |
| MODEL 3522 | ||
| Measured particle range | µm | 0.1–2.5 |
| Impactor | µm | 2.5 |
| Mass-concentration range | mg/m³ | 0.01–10 |
| Accuracy | — | ±10% of reading ±1 digit |
| GENERAL | ||
| Sampling flow rate | L/min | 1 |
| Data logging | records | 500 time-stamped measurements |
| Interface | — | RS-232C |
| Power supply | — | Ni-MH battery pack or AC adapter |
| Dimensions | mm | 180 H × 150 D × 65 W |
| Weight with batteries | kg | Approx. 2 |
The 3520 Series comprises Models 3521 and 3522. Select the impactor and measuring range according to the required particulate fraction and aerosol type.
Used in these solutions
Applications
Machining and process aerosols
Measure oil-mist mass concentration around machining, lubrication and process equipment.
Workplace particulate surveys
Assess worker-area particulate concentrations using PM10, PM4 or PM2.5 size selection.
Indoor particulate investigations
Support direct-reading mass measurements during indoor air-quality investigations.
Occupational health checks
Identify concentration changes during tasks, ventilation adjustments or control-measure evaluations.
Process and product control
Track particulate generation where aerosol mass affects product or process quality.
Laboratory aerosol studies
Collect time-resolved mass-concentration data for oil mist and particulate research.
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