TSI Incorporated 8587A, Руководство по эксплуатации и обслуживанию

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4-6 Model 8587A Laser Photometer
Table 4-1. Example Fit Test Sequence
Operation ASCII CODE Description of Function
SEND U Unlock valves
SEND P Set PURGE mode
Delay 20 seconds Delay for sensor to purge of aerosol
SEND R Reset running average
Delay 10 seconds Average 10 seconds of purge signal data (ZERO)
SEND D or K Request data as HEX (D) or Decimal (K)
RECEIVE 8 char Receive string voltage data
Convert - Convert data to decimal long integer (ZERO)
SEND C Set UPSTREAM sample mode (chamber)
Delay 20 seconds Delay for UPSTREAM sample to stabilize
SEND R Reset running average
Delay 10 seconds Average 10 seconds of UPSTREAM (chamber) signal data
SEND D or K Request data as HEX (D) or Decimal (K)
RECEIVE 8 char Receive voltage data
Convert - Convert UPSTREAM (chamber) data to decimal long integer
SEND M Set DOWNSTREAM sample mode (mask)
SEND V3F Set high flow mask purge (mask sample at high flow)
Delay 10 seconds Delay for mask to purge
SEND V3N Set flow for mask sample mode
Delay 20 seconds Delay for DOWNSTREAM (mask sample) to stabilize
SEND R Reset running average
Delay 60 seconds DOWNSTREAM (mask) signal data averaged over 60 second
interval, since reset.
SEND D or K Request averaged data as HEX (D) or Decimal (K)
RECEIVE 8 char Receive voltage data
Convert - Convert DOWNSTREAM (mask) data to decimal long integer
Calculate average
fit factor (see
discussion above)
voltage ZERO - (mask) voltage avg. DOWNSTREAM
voltage ZERO - (chamber) voltage UPSTREAM
factor Fit
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F i l t e r T e s t i n g A e r o s o l
Instruments using light scattering such as the Model 8587A are widely
specified for filter testing, particularly since good correlation exists between
light scattering and a mass measurement. TSI uses the same aerosol
sensor in the Model 8587A Laser Photometer as is used in its popular
Model 8130 Filter Tester.
Aerosols of Dioctyl-Phalate (DOP), Emery Oil, or Olive oil or a mean
diameter of 0.2 to 0.3 microns and geometric standard deviation (GSD) of
approximately 1.6 or less are typically used for filter testing.
Particle size is very important for filter testing since test results will depend
on the size used. The aerosol size indicated above is desirable in that it is
in the most penetrating particle size range for typical non-electret filters.