Safety And Interlocking Gas Analysis System For Filter Protection DDOP Double Dry nOn-cooled Probe for preheater exits provides continuous monitoring of explosive gases. Designed with two probes so that one is always in use, the DDOP eliminates high-risk blind periods, safeguarding personnel and equipment from fire in the filter/ESP. The DDOP monitors explosive gases such as CO and CH4 at the preheater exit, some of the harshest operating conditions of any process. High levels of particulate matter necessitate frequent cleaning, and for single probes this means brief periods without measurements. These brief periods present a huge risk. If the worst happens, the damage can be catastrophic. An explosion in the ESP could cause extensive damage to the filter and put peoples lives in danger.

• While the DDOP safety and interlocking gas analysis system works with any filter air pollution control arrangement, it is ideally suited for use with electrostatic precipitators (ESPs), where pre-filter continuous gas analysis is especially important.