This simple device fits into the air train immediately after the desiccant filter where it monitors air quality by means of obvious color changes in parchment sensor disks which can be seen through a plastic viewport. It can also determine the longevity of the filter media. When a color change indicates that the moisture level in the processed air is too high, the desiccant needs changing. If compressor running time to that point has been tracked (manually or by hour meter), then the normal life expectancy of chemicals in running hours is known. By subtracting a few hours from that value and changing your chemicals a little early, a safety margin can be maintained on your air quality. An additional colored sensor detects unsafe levels of carbon monoxide. Since the longevity of filtrants can be affected by many environmental and mechanical factors, this monitor can catch any unexpected shifts in air quality caused by unpredictable / aberrant conditions. Seals: Monitor screws open / closed and seals on an O-ring. Replacement sensors: Kit #44071 - One each CO disk and humidity detector ring. #44073 - Humidity detector ring only. #44077 - CO disk only.
Flow/pressure rating - 50 cfm to 5,000 psi.
Connections - 1/4 NPTF bottom ports.
Replaceable Sensors:
Blue outer ring changes to pink at relative humidity of 40%.
Yellow central disk becomes coral black at 50 ppm carbon monoxide.