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.
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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