What happens if I get the pipe size wrong?

This will affect the volumetric reading. 1mm out on a 50mm pipe is the equivalent to 4% of the overall area, whereas 1mm on a 200mm pipe is only 1%. The instrument measures the flow velocity and then calculates the volumetric reading by the pipe information entered. If this is incorrect the volumetric reading will be incorrect. Use an ultrasonic thickness gauge or pipe tables if a more accurate reading is required.

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