Type "S" and "ST"
S Probe



The Type "S" (Stauscheibe) or Reverse Pitot-Static probe measures velocity, weight flow rate, and related volumetric quantities of a moving fluid.  The probe consists of two stainless steel tubes with impact holes oriented at 180° angles to one another (see Fig. 1).  One hole faces upstream for the measurement of total pressure (PT); the other is aligned in a downstream direction for static pressure (PS) measurement.  The difference between these two pressures (PT - PS) approximately equals 150% of the velocity pressure (PV) of the fluid.  PV approximation must be corrected to true value through proper calibration to the particular flow situation.


United Sensor "S" Probes are designed for easy entry into small holes in stack or flow passage walls, and due to their relatively large impact (sensing) holes, are especially effective in the presence of high concentrations of clogging particulate matter.  Large pressure tube diameters permit easy cleaning.


A wide selection of variations permit custom designing of the "S" Probe to meet exact specifications.  These include special constructions for high operating temperature and pressures; longer or shorter probe lengths; larger or smaller diameter tubing; and built-in thermocouples.

Call 603.672.0909

Calibration Services

United Sensor Corporation has two wind tunnels available for which to perform probe calibrations. More…

Contact Us

United Sensor Corporation
3 Northern Boulevard
Amherst, NH 03031.2329
Tel: 603-672-0909
Fax: 603-672-0037