The catalyst causes a chemical reaction between the chemical vapor and one of the elements that exists in the air, such as oxygen, and converts a hazardous vapor to a less hazardous one. Chemical canister Chemical canisters are imprinted with an expiration date, after which the canisters must be disposed. Cartridges should be discarded after each use. Requires the monitoring of a contaminant and oxygen levels. It is also called airline respirator.
Air is supplied by a compressor or pump.
A mechanical filter is needed to remove the compressor lubricating oil vapors and mists from the breathing air. When a full body suit is used, SAR supplies the air to provide cooling air to the full body suit and hood. Supply air respirator hose and full body suit. SAR is not recommended for entry into IDLH atmospheres unless the respirator is equipped with an escape bottle, which provides 5 to 15 minutes of emergency air. Airline impairs the worker's movement and requires workers to retrace their steps when leaving the area.