Instrument - Scanning Mobility Particle Sizer with Soft X-ray DMA in Negative Mode

Short name:

Full name:
Scanning Mobility Particle Sizer with Soft X-ray DMA in Negative Mode

What is being measured:

Sampling Protocol:


TSI 3010 CPC , TSI 3081 DMA

Instrument year :

Data recording software:

Data analysis software:

Raw data time resolution:
6 mins

Analysis data averaging:

Detection limit:

Sensitivity to temperature (and correction method, if applicable): :

Sensitivity to relative humidity (and correction method, if applicable): :
Low up to 40%, if humidity is too high, connect a dryer tube before the inlet, and correct the size based on reduced humidity

Sampling method:
Direct Sampling

Sample preparation method:

Sample residence time (chamber to instrument) (seconds):

Length of tubing (cm):

Instrument flow rate:

Tubing inner diameter:

Tubing material:
Stainless Steel

Chemical identification method:

Data analysis method:
A custom-written Matlab to perform inversion of raw time series of particle number concentrations to produce particle size distributions from the Caltech SMPS system

Quantification method:
The data inversion for SMPS data is developed based on finite element analysis of particle trajectories along the DMA column, Monte Carlo simulatino of particle Brownian motion, and CPC RTD modeling described in Mai et al (I & II, 2018). The custom build Matlab software takes in the raw output from the instrument, and inverts it to particle size distribution.The large particle tail is corrected assuming log-normal size distributions.

Calibration method:
Flow calibration is performed by fitting pressure transducer response current and flow measure from Gilibrator directly. Voltage calibration is performed by fitting HV source loop feedback current and multimeter measurement. Peaks are adjusted by sampling PSL (50nm, 150nm, 300nm, 500nm) directly into the insturment.

Calibration drift estimate:
Low (on the order of weeks)

Calibration schedule:
6 Month

Uncertainty estimation method:
Compare inversion results with PSL diameters to estimate uncertainty.

Known interferences:

Link to supplemental information:
DOI: 10.1080/02786826.2018.1528005 DOI: 10.1080/02786826.2018.1528006

Additional notes:

Measurement uncertainty:

Measurement units: