1.2. Safety and Precautionary Measures

WARNING

Carefully review the following safety limitations and precautions before placing this instrument in service. Incorrect use can cause serious personal injury or death.

• Check function (see Section 3.6). each day before use. MSA recommends carrying out a routine inspection prior to each day's use.
• Perform a Bump Test (see Section 3.8). before each day's use to verify proper instrument operation. The instrument must pass the bump test. If it fails the test, perform a calibration (see Section 3.9). before using the instrument.
• Perform a bump test more frequently if the unit is subjected to physical shock or high levels of contaminants. Also, perform a bump test more frequently if the tested atmosphere contains the following materials, which may desensitize the combustible gas sensor and reduce its readings:
• Organic silicones
• Silicates
• Lead-containing compounds
• Hydrogen sulfide exposures over 200 ppm or exposures over 50 ppm for one minute.
• The minimum concentration of a combustible gas in air that can ignite is defined as the Lower Explosive Limit (LEL). A combustible gas reading of "XXX