Prototype particulate stack sampler with single-cut nozzle and microcomputer calculating/display system

Conference · Mon Jan 01 04:00:00 EST 1979

OSTI ID:5775714

Eler, J C; Littlefield, L G; Tillery, M I

A prototype particulate stack sampler (PPSS) has been developed to improve on the existing EPA Method 5 sampling apparatus. Its primary features are (1) higher sampling rate (56 1/min); (2) display (on demand) of all required variables and calculated values by a microcomputer-based calculating and display system; (3) continuous stack gas moisture determination; (4) a virtual impactor nozzle with 3 ..mu..m mass median diameter cutpoint which collects fine and coarse particle fractions on separate glass fiber filters; (5) a variable-area inlet to maintain isokinetic sampling conditions; and (6) conversion to stainless steel components from the glass specified by EPA Method 5. The basic sampling techniques of EPA Method 5 have been retained; however, versatility in the form of optional in-stack filters and general modernization of the stack sampler have been provided in the prototype design. Laboratory testing with monodisperse dye aerosols has shown the present variable inlet, virtual impactor nozzle to have a collection efficiency which is less than 77% and significant wall losses. This is primarily due to lack of symmetry in this rectangular jet impactor and short transition lengths dictated by physical design constraints (required passage of the nozzle through a 7.6 cm (3 in) diameter stack port). Electronic components have shown acceptable service in laboratory testing although no field testing of the prototype under a broad range of temperature, humidity, and SO/sub 2/ concentration has been undertaken.

• Research Organization: Los Alamos Scientific Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5775714
• Report Number(s): LA-UR-79-2421; CONF-791018-1
• Country of Publication: United States
• Language: English

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54 ENVIRONMENTAL SCIENCES
AEROSOL MONITORING
AEROSOLS
AIR FILTERS
AIR POLLUTION CONTROL
AIR POLLUTION MONITORS
AIR SAMPLERS
CASCADE IMPACTORS
CHALCOGENIDES
COLLOIDS
DESIGN
DISPERSIONS
EQUIPMENT
FIBERGLASS
FILTERS
FLUE GAS
GASEOUS WASTES
HUMIDITY
LABORATORY EQUIPMENT
MANAGEMENT
MATERIALS
MOISTURE
MONITORING
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PARTICLES
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
SAMPLERS
SIZE
SOLS
STACK DISPOSAL
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TEMPERATURE EFFECTS
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES