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Half Inch Nessi Probe

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Description

The Insight Analytical ½” NPT NESSI Sample probe is an enhanced version of the standard ½” NPT quill probe, where an upper section has been added to allow up to three NESSI/SP76 compliant sample system components to be mounted and connected in series.

The quill section of the probe has a 2 mm bore for fast response time, a hemispherical tip to reject particulates and liquid aerosols, and follows the Insight Analytical philosophy of eliminating excessive probe insertion length.

Minimizing the sample probe insertion length allows a standard probe length to be used for most gas phase application with a ½” NPT threadolet connection.  This probe has an insertion length of 50 mm from the base of the NPT thread, or about 1 to 1.5 inches (25 to 38 mm) as measured from the inside wall of the process pipe, which is sufficient to obtain a representative sample in most applications.

The elimination of excess sample probe length lowers cost, improves response time, makes plugging less likely, reduces pressure drop and flow disturbances in the process pipe, and makes it possible to design the probe to withstand high process gas velocity without failure caused by vortex shedding induced vibration.  This probe has been designed to meet the vortex shedding safety calculations in the ASME PTC 19.3 TW-2010 thermowell design standard for fluid velocities up to 100 m/s and fluid density up 0.4 kg/m3.

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