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What is the difference between a Static Pressure Probe and a Pitot Tube?

 

A static pressure probe is pictured at the right.  It includes a magnet to help hole it to a duct, a 90⁰ bend, and a sealed bullet  like tip. The shorter side of the tube has four tiny holes in it.  The static pressure is the outward or bursting pressure in a duct.  You can think of it as like measuring tire pressure.

 

A pitot tube is pictured at the lower right.  It measures both total pressure and static pressure and has locations for connecting two tubes.  When you connect the two tubes to one side of the DG-700, it will give you a reading of the pressure difference between total pressure and static pressure, which is velocity pressure.  If you connect the tubes to the B channel and put the DG-700 in the PR / V mode, it will read out in velocity in feet per minute instead of velocity pressure in Pa. 

Click here to watch a video with more information.

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