TSI Model 8525 Condensation Particle Counter (CPC)

Overview

The TSI Model 8525 Condensation Particle Counter (CPC) is a portable, high-sensitivity aerosol instrumentation platform engineered for real-time quantification of ultrafine particles in ambient, indoor, and process air environments. Unlike optical particle counters relying solely on light scattering, the Model 8525 employs condensation nucleus counting (CNC) technology—where submicron particles act as nucleation sites for supersaturated isopropanol vapor, growing them to detectable sizes (~12 µm) via laser-based optical detection. This principle enables reliable enumeration of particles as small as 2 nanometers—well below the lower detection limit of conventional optical counters—and ensures high counting efficiency (>50% at 2 nm, >90% above 3 nm) across the full operational size range. Designed for field-deployable precision, the instrument delivers trace-level particle concentration data critical for source identification, exposure assessment, and process control validation in non-explosive environments.

Key Features

• Ultra-low size cutoff: Certified detection threshold of 2 nm with calibrated growth tube efficiency and validated counting response per ISO 27891 and ASTM D6624 standards.
• Portable architecture: Compact form factor (270 × 140 × 140 mm) and battery-powered operation (6 × AA, 6 h typical) support walk-through surveys, duct probing, and mobile monitoring without external power or compressed gas.
• Robust internal memory: Stores up to 470 discrete measurement points with timestamped concentration values; supports 141 unique test identifiers for structured campaign logging.
• High-resolution time-series logging: Configurable 1-minute interval data acquisition enables continuous 1000-hour monitoring—ideal for diurnal pattern analysis, leak persistence verification, or HVAC system commissioning studies.
• Integrated isopropanol delivery system: Precision-machined saturator and condenser maintain stable supersaturation ratio; reagent-grade isopropanol consumption optimized for 8-hour operation per fill at 21 °C.
• RS-232 serial interface: Standard 9600-baud output compatible with TSI’s TrakPro™ software, third-party SCADA systems, and custom Python/ LabVIEW data acquisition frameworks.

Sample Compatibility & Compliance

The Model 8525 is designed for sampling clean, dry, non-corrosive gaseous streams containing airborne particulate matter. It is not rated for use in explosive atmospheres (non-ATEX, non-IECEx) and requires inlet filtration (e.g., TSI’s 99.97% efficient 0.3 µm HEPA filter) when measuring high-concentration or oily aerosols to prevent saturator fouling. The instrument complies with ISO 27891:2016 (determination of particle number concentration using CPCs), meets the performance criteria outlined in EPA OTM-30 for ultrafine particle monitoring, and supports GLP-compliant data integrity through timestamped, non-editable internal storage. While not intrinsically safe, its electrical design conforms to IEC 61010-1 for laboratory and industrial measurement equipment.

Software & Data Management

Data export is facilitated via RS-232 connection to TSI’s TrakPro™ Lite or TrakPro™ Data Analysis Software (Windows-compatible), enabling visualization of temporal concentration profiles, geotagged survey mapping (when paired with GPS modules), statistical summaries (mean, SD, percentiles), and CSV export for integration into LIMS or enterprise analytics platforms. All logged datasets include embedded metadata: test ID, operator code, instrument serial number, calibration date, and environmental conditions (temperature, battery voltage). Audit trails are maintained for all configuration changes and memory clear events—supporting FDA 21 CFR Part 11 compliance when used within validated workflows under documented SOPs.

Applications

• Indoor Air Quality (IAQ) Source Hunting: Rapid localization of ultrafine particle emissions from printers, photocopiers, laser toner handlers, and office HVAC components.
• Industrial Leak Detection: Identification of fugitive emissions from boiler gaskets, flange seals, catalyst beds, and nanoparticle synthesis reactors.
• Research & Development: Quantification of nucleation-mode particle yields in combustion studies, atmospheric simulation chambers, and nanomaterial handling facilities.
• Occupational Hygiene Monitoring: Time-weighted average (TWA) exposure assessment for workers near welding fumes, diesel exhaust, or pharmaceutical spray-drying operations.
• Filter Efficiency Validation: Downstream particle challenge testing for ULPA and HEPA filters in cleanroom and biomedical device manufacturing settings.

FAQ

What particle size range does the Model 8525 reliably detect?

It detects particles from 2 nm to >1 µm with certified counting efficiency per ISO 27891, using isopropanol-based condensational growth.
Can the instrument operate continuously for extended periods?

Yes—internal memory supports up to 1000 hours of 1-minute-interval logging; external power adapters are available for unattended long-term deployment.
Is calibration traceable to national standards?

TSI provides NIST-traceable factory calibration certificates for counting efficiency and flow rate; users may perform routine verification using polystyrene latex (PSL) nanoparticles and certified flow meters.
Does the Model 8525 require periodic maintenance beyond isopropanol refills?

Annual preventive maintenance is recommended, including saturator cleaning, optical alignment verification, and pump performance check—per TSI Service Bulletin SB-8525-01.
Can data be exported directly to Excel or LIMS?

Yes—TrakPro™ exports native .csv files with column headers compliant with ASTM E1447 and ISO/IEC 17025 data reporting requirements.