The APM 460 BL used for sampling particulate matter (PM10) and the APM 411 for gaseous pollutants. Cleaning and calibration procedures differ between the two, with the APM 460 BL focusing on particulate matter separation and filter handling, while the APM 411 involves gas sampling through impingers and reagents.
APM 460 BL Cleaning and Calibration:
Cleaning:
The APM 460 BL uses a cyclone to separate particles, with coarse particles collected in a cup and smaller particles on a filter paper.
Clean the filter holder surface and handle the pre-weighed filter paper carefully to avoid damage.
The cyclone and collection cup should also be cleaned regularly.
Calibration:
The APM 460 BL typically involves calibrating the flow rate of the blower to ensure accurate sampling.
This may involve using a calibrated flow meter and adjusting the blower settings as needed.
Calibration should be performed according to the manufacturer's instructions and may involve checking the pressure drop across the filter and cyclone.
APM 411 Cleaning and Calibration:
Cleaning:
The APM 411 utilizes impingers containing reagents to absorb gaseous pollutants.
The impingers and associated tubing should be cleaned thoroughly after each sampling period to prevent contamination.
Reagents should be prepared and handled according to standard procedures.
Calibration:
The APM 411 requires calibration of the flow rates for each impinger.
This involves using a calibrated flow meter and adjusting the needle valves on the impinger inlets.
The calibration process should ensure that the flow rates are within the specified ranges for accurate sampling.
General Notes:
Both devices require careful handling and adherence to established protocols to ensure reliable and accurate data collection.
Refer to the manufacturer's manuals for specific cleaning and calibration procedures for each device.
Consider using a checklist or standard operating procedure (SOP) to ensure all steps are followed correctly.
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