Q-2, r. 4.1 - Clean Air Regulation

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84. A wet scrubber connected to fuel burning equipment with a rated power equal to or greater than 3 MW must have a system that continuously measures and records the gas pressure loss through the scrubber using a differential pressure gauge accurate to within 0.5 kPa.
In addition, the wet scrubber must have a system that continuously measures and records the scrubbing liquid pressure at the delivery pipe inlet using a pressure gauge accurate to within 10% of the rated pressure in that pipe.
O.C. 501-2011, s. 84.