Instrument - Scanning Mobility Particle Sizer with Soft X-ray DMA in Negative Mode
Short name:
XMAN SMPS
Full name:
Scanning Mobility Particle Sizer with Soft X-ray DMA in Negative Mode
What is being measured:
Sampling Protocol:
Online
Manufacturer:
Custom
Model:
TSI 3010 CPC , TSI 3081 DMA
Instrument year
:
2019
Data recording software:
Labview
Data analysis software:
Matlab
Raw data time resolution:
6 mins
Analysis data averaging:
Detection limit:
10nm-1um
Sensitivity to temperature (and correction method, if applicable):
:
Low
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):
13
Length of tubing (cm):
0.005
Instrument flow rate:
0.5
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: