The DAA flow indicator features a self-cleaning mechanism to guarantee rotor visibility. Most types of flow indicators suffer visibility problems as the result of residue build-up on the viewing windows. These traditional indicators usually require a plant shutdown to remove and restore them. In response to this, the DAA just requires a simple twist of the sight glass. Integral wipers eliminate buildup, which is then washed away by the media's flow. A datasheet is available at http://koboldusa.com/sites/default/files/product_files/DAA-flow-indicator-datasheet.pdf
Flow Indicator Cleans Itself
Kobold Instruments Inc.