A flowchart for measuring PM10 would typically include: (1) Air intake through a PM10 size-selective inlet, (2) particle collection on a filter, (3) filter weighing before and after sampling to determine mass of collected PM10, (4) calculation of PM10 concentration based on air volume sampled and mass collected; with additional steps for data recording, quality checks, and instrument calibration throughout the process.
Detailed Flowchart:
Start:
Set up PM10 sampler with a calibrated flow rate and a clean filter.
Record start time and location details.
Air Sampling:
Ambient air is drawn into the sampler through a PM10 size-selective inlet, which only allows particles with an aerodynamic diameter of 10 micrometers or less to pass through.
Particles are collected on a pre-weighed filter paper.
Monitor and record the flow rate throughout the sampling period.
Filter Analysis:
Carefully remove the filter from the sampler, avoiding contamination.
Weigh the filter on a sensitive balance to determine the mass of collected particles.
Record the final weight of the filter.
Calculation:
Calculate the total volume of air sampled by multiplying the flow rate with the sampling time.
Subtract the initial filter weight from the final weight to get the mass of PM10 collected.
Divide the mass of PM10 by the total air volume sampled to determine the PM10 concentration (µg/m³).
Data Recording and Quality Check:
Record all relevant data, including date, time, location, flow rate, initial and final filter weights.
Perform quality checks on the data, including verifying flow rate stability and checking for potential contamination.
End:
Report the PM10 concentration according to the established standards.
Key Points:
Size-selective inlet:
A crucial component of a PM10 sampler, designed to only allow particles with a diameter less than 10 micrometers to reach the filter.
Gravimetric analysis:
The standard method for measuring PM10 concentration, which involves weighing the filter before and after sampling to determine the mass of collected particles.
Calibration:
Regular calibration of the sampler is necessary to ensure accurate measurements.
Overview
ReplyDeleteACGIH's Fundamentals in Industrial Ventilation is a course that covers both basic and advanced topics related to industrial ventilation including:
The behavior of air and chemical contaminants in the air
Industrial process exhaust system design (including ACGIH calculation methods)
Make-up and supply air ventilation systems
Dilution ventilation systems
Selection and design of exhaust hoods, ducts, and fittings
Fans and air cleaners (including Fan Laws)
Troubleshooting and testing of existing systems
Hands-on testing and measurements
Calculation and estimation approaches related to airborne contaminants
TLV and TWA
OA for dilution, fans, system testing, sound and noise, heat stress, radiation, ventilation, statistics, chemistry, etc.
A calculations lab in which participants work in a team environment
At the end of this course, participants will be able to:
Identify and select appropriate ventilation systems for process emission/exposure control
Measure and evaluate the performance of ventilation systems (flow, pressure, horsepower)
Design and evaluate dilution ventilation systems
Design/re-design local exhaust systems using state-of-the-art design procedures
Design, operate, and modify hoods appropriate to participants' needs
Critically review ventilation system plans, drawings, and specifications of engineers and architects
Understand the basic fundamentals, estimation techniques, and calculations related to occupational health and safety
Understand terms and units used in OH&S related estimations and formulas
Understand and apply formulas related to OH&S estimations and calculations
Use dimensional analysis to generate formulas and mathematical relationships
Prepare for certification exams