3. Field verification of instrument accuracy (e.g., function/bump test, full calibration):
a. For the gas detector instruments that utilize the specially designed Bump Test Unit, the frequency shall be as follows:
b. Bump Test of instrument accuracy (tests must be documented).:
i. At a minimum, daily before use
ii. At a minimum, monthly (not to exceed 30 days)
iii. Additional intervals based on environmental conditions (e.g., exposure to environmental conditions such as sensor poisons)
c. Calibration:
i. At a minimum, a 6-month basis must be conducted and documented
ii. More frequently, as recommended by the manufacturer (e.g., exposure to environmental conditions such as sensor poisons)