Các thiết bị quan trắc phải được kiểm tra định kỳ bằng khí chuẩn theo khuyến cáo của nhà sản xuất nhưng phải đảm bảo tối thiểu tần suất 2 tuần/ lần bởi đơn vị vận hành Hệ thống.
The monitoring equipment must be checked periodically by standard gas as recommended by the manufacturer but must ensure that the minimum frequency of 2 weeks / times by system operators.
Observation devices must be periodically inspected with a standard gas as recommended by the manufacturer but must ensure a minimum of 2 weeks per time by the system operator.
The comparative devices must be examined by standard-issue weapons by the manufacturer's propensity, but make sure the least least of the two weeks or by the system unit.<br>