USING THE BI-AIR CASSETTE FOR COLLECTING AIRBORNE SAMPLES
Equipment list:
Bi-Air® cassette, perforated insert, 1/4 inch OD flexible tubing,
0-5 lpm rotameter, stopwatch, tripod, velcro or masking tape, high-volume
sample pump.
- Attach the pump, tubing and cassette to a tripod, placing it so the inlet of the cassette is facing upwards
- Attach a calibration probe and rotameter to the cassette
- Calibrate the airflow rate to about 3.5 lpm
- Remove the calibration probe and rotameter
- Collect a sample for 5 - 10 minutes, or as conditions warrant
- Seal the cassette with the end caps
USING THE BI-AIR CASSETTE FOR SAMPLING WALL OR CEILING CAVITIES
Equipment list:
Bi-Air® cassette, perforated sample probe, calibration probe, 0-5
lpm rotameter, 1/4" OD flexible tubing, low-volume personal pump,
portable electric drill, 5/16" drill bit, rubber mallet (white),
stopwatch, tube of silicone caulking
A clean sample probe should be used for each sample that is to be collected.
- Drill a 5/16-inch hole in the wall or ceiling cavity
- Place the perforated probe on the Bi-Air®.
- Calibrate the airflow rate to 1 lpm using a low-volume personal sampling pump
- Insert the probe into the wall cavity until the expanded base of the probe seals the hole
- Bang on the wall several times using a (white) rubber mallet, within about 1- to 2 feet of the sample location (or cover a black rubber mallet with a zip-lock bag before using , as it may discolor the paint).
- Bang gently on the wall again after the first minute of sampling
- Collect a 2-minute sample from the wall cavity
- Remove the probe and seal the cassette with the end caps
- Seal the hole in the wall using a tube of silicone caulk, spackling, or similar material