Prior to sampling commencing you may want to seal the cassette with a cellulose band to prevent leakage from occurring. Secure the cassette and attach the adapter on the end of the short piece of rubber tubing to the outlet of the cassette. Then connect the long piece of flexible tubing to the inlet of the pump. Attach the filter holder in the worker's breathing zone and the pump to the worker's belt (pumps are sometimes placed in a protective leather pouch and the whole harness strapped to the chest or back of the person being sampled, with the filter assembly in the worker's breathing zone). The inlet of the cassette should be facing down. If a cyclone is being used, it should be placed in a vertical (downwards) position.

Remove the plug from the cassette inlet if applicable and turn the pump on. Note the start time and any other pertinent sampling information.