CiSCO Ammonia (NH3) Scrubber
When Ammonia (NH3) is present in the sample stream, a CiSCO NH3 Scrubber is installed to help protect the CEMS analyzers and maintain sample flow. The NH3 scrubber is installed upstream of the analyzers.
Use of the Ammonia Scrubber:
NH3 may cause clogging of the sample stream in the sample handling system and the analyzers at the temperatures downstream of the heated sample line. Clogging is a result of the buildup of ammonium salts that may be detected as a white powder.
The CiSCO NH3 scrubber is designed to remove NH3 from the sample stream and prevent the formation of ammonium salts. This is achieved by exposing the sample gas to phosphoric soaked beads. NH3 will react with Phosphoric acid to form ammonium phosphate. This reaction is unique to NH3 and will not interfere with other constituents in the sample stream.
Phosphoric acid may absorb moisture present in the sample stream, causing phosphoric acid to liquefy. Therefore, the scrubber must be installed vertically to allow this liquid to drain to the bottom where it will not interfere with the sample gas constituents. A clear plastic site glass near the bottom of the scrubber allows visual inspection of the accumulation of the liquid phosphoric acid solution.
Part # 83000055
The life span of the scrubber is dependent upon the amount of exposure to NH3 and moisture in the sample stream. Replace the scrubber per the recommendations in the CEMS Operation and Maintenance Manual, if visible ammonium salts are detected in sample handling system and/ or excessive liquid accumulation is detected at the base of the scrubber.