Filters

There are two filters that are intended to prevent soot or other contaminants from entering the unit.  The first is a light-blue colored in-line filter that is located at the end of the sample tubing assembly.  The second is a bowl filter located on the inside of the lid.  Periodic inspection of these filters will ensure smooth operation.  When new, the elements in both of these filters are a yellow/white color.  Both are oriented in the sample stream in a manner that causes any contaminants to collect on the outside of the filter media, which allows for a visual inspection of filter status.  If the primary filter is properly maintained, the secondary filter will rarely require changing.