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RELATED EVENTSRELATED NEWSTSI Instruments in Laser Printer Emissions Research TSI Particle Instruments Offers QualityGuard™ Service Agreements
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CONDENSATION PARTICLE COUNTERS
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TSI’s Model 3787 General Purpose Water-based Condensation Particle Counter (GP-WCPC), a CPC, can detect airborne particles down to 5 nm in diameter utilizing state-of-the art water based condensation particle counting technology. |
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TSI’s N-WCPC Model 3788 is designed for investigators interested in detecting the smallest nanoparticles. |
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The Model 3007 CPC is one of our smallest Condensation Particle Counters. At only 3.8 pounds, it provides versatility not common with larger particle counters. |
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Condensation Particle Counter 3772 detects airborne particles down to 10 nm at an aerosol flow rate of 1.0 L/min, over a concentration range from 0 to 104 particles/cm3. |
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Condensation Particle Counter 3775 is a general-purpose counter that detects airborne particles down to 4 nm. It provides highly accurate measurements over a wide concentration range from 0 to 107 particles/cm3. |
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The Engine Exhaust Condensation Particle Counter 3790 is the latest addition to TSI’s CPC family, and it fully meets all proposed PMP requirements for Euro 5 regulations. |
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Environmental Particle Counter™ 3783 Ultrafine (UFP) particles are everywhere polluting the air, eroding our health, and affecting our climate the first step in cleaning the air of these potentially hazardous particles, is to measure them. To do so, use this CPC. |
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TheUltrafine Condensation Particle Counter 3776 (UCPC), a type of condensation particle counter (CPC) is designed primarily for researchers interested in airborne particles smaller than 20 nm. |
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The Model 3031200 Environmental Sampling System provides representative sampling and proper conditioning of ambient submicrometer aerosol for accurate size distribution and particle number concentration. |
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TSI Flow Splitter directs an aerosol sample to as many as four destinations at once. |
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TSI Particle Size Selector Model 376060 provides different size cuts for our CPCs. |
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TSI offers two, top-quality pumps for use with our Particle Instruments. |
BROCHURESCATALOGSPOSTERSSPEC SHEETSSERVICE INFORMATION
APPLICATION NOTESBIBLIOGRAPHYSERVICE PROCEDURESSTANDARD REPLACEMENT PARTSTECHNICAL NOTESFREQUENTLY ASKED QUESTIONSshow/hide all answers
- How do you test the UCPC counting efficiency down to 3-nm diameter particles?
Sodium chloride or silver particles in the range from 2 to 300 nm are generated using an ultrafine condensation-type aerosol generator described by Scheibel and Porstendorfer (1983) and more recently by Kesten, Reineking, and Porstendörfer (1991). The particles are size-classified with a modified Electrostatic Classifier and their concentration measured with an Electrometer. The UCPC concentration measurement is compared to the Electrometer.
- How is particle coincidence handled in single-particle-counting mode?
Each time a particle enters the optical detection zone in the CPC, it inhibits or blocks the counting of additional particles until the particle has passed. At low particle concentrations, this effect is minimal, but at concentrations in the thousands per cubic centimeter, the effect becomes significant. The CPC measures the time that is blocked by the presence of particles and this time is subtracted from the sample time of the measurement, thereby compensating for the coincidence effect. This correction may sound like cheating, but it has a solid statistical foundation based on the random arrival times of particles to the sensing zone. At very high concentrations, the correction becomes too large to be accurate, and the CPC then uses its photometric mode to calculate the particle concentration.
- Is the CPC compatible with my component SMPS or DMPS sizing system?
- What is the final droplet size after growth by condensation?
This question has been investigated, theoretically, by Ahn and Liu (1990). For the initial particle diameters of 5 and 20 nm, the computation results show a final droplet size of 11.3 and 12.3 micrometers, respectively (Ahn and Liu, 1990). Similar experimental results have also been determined.
- Will I get biological growth in the water?
We have not experienced significant biological growth in the instrument, but the wick does provide a warm, moist environment for biological growth to occur. To minimize biological growth, you should establish a maintenance routine that includes draining the reservoir at regular intervals, rinsing the fill bottle prior to adding water, periodically cleaning the reservoir, and replacing the wick at least every six months or when it shows signs of discoloration or contamination. The wick is easily removed for inspection and replacement. We recommend that the instrument be dried and the wick be removed and dried when the instrument will be out of service for more than a few weeks.
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