Accurate flow rate measurement is critical for monitor setup, service and calibration.
Flow rates are measured as volumetric or standard and recorded in units LPM or SLPM.
Volumetric flow rate
Volumetric flow rate refers to the volume of a gas (air) which flows through the area in a given period of time (l/min or LPM).
Volumetric flow rate measurement is independent of the temperature and pressure conditions under which the measurement is being performed.
A volumetric flow rate measurement is required for calibration of monitors using particle monitors to ensure correct operation of the cyclone.
Standard flow rate
Standard flow rate is the volumetric flow rate of a gas (air) corrected to ‘standard’ conditions of temperature and pressure (standard l/min or SLPM).
There are no universal standard conditions; these differ by country and industry so please take care when comparing two standard flow rate measurements.
We recommend a standard flow rate measurement for the calibration of gas modules and monitors using particle profilers.
To provide comprehensive technical support, Aeroqual’s technical team needs you to use a flowmeter that meets Aeroqual recommended minimum specifications.
For gas measurements, Aeroqual recommends a high-quality flowmeter with a flowmeter range / accuracy of 0.0 to 2.5 LPM / ±2% of reading.
You can use the TSI 4040 or Bios Defender DryCal.
Note: A 0.2 - 2.5 L/min rotameter isn’t suitable.
Bios Defender DryCal
Particle matter flowmeters
For particle matter flow rate measurements, Aeroqual recommends a flowmeter with a flowmeter range / accuracy of 0.0 to 2.5 LPM / ± 5% full scale.
You can use the TSI 4040, Bios Defender DryCal, or a 0.2 - 2.5 L/min rotameter.
A leak can be caused by loose connections, worn seals (o-rings) or split tubing. If a leak occurs, it may affect the flow rate which impacts the accuracy of the measurement.
For this reason, we recommend you buy the Aeroqual R23 vacuum gauge in addition to your chosen flowmeter.
This allows trained service technicians to perform a leak checks on monitors, ensuring correct operation and accurate data capture.