By Scott Weatherwax
The term, "unit of measure" of a pressure sensor refers to the measurement system used to calibrate that sensor. In the United States, the most common unit of measure is pounds per square inch, or psi. Depending on the industry or application, the units of pounds per square inch will require a conversion to another unit of measure. One pressure sensor company, NovaSensor, a division of General Electric, manufactures its sensors using Pascals or kilopascals. So sometimes converting units, as with NovaSensor, isn't just desirable, it's necessary.
Below are the most common conversions for PSI to other units of measure:
1 psi = 27.68 inches of water (at 39° F)
1 psi =2.036 inches of Hg (at 32° F)
1 psi = 6.8947 Kilopascal
1 psi = 68.947 mili Bar
1 psi =70.308 cm of water (at 4° c)
1 psi = 51.715 mmHg (at 0° C)
No one is really sure why NovaSensor calibrated its units of measure in Kilopascal. However, many of the recent product introductions by NovaSensor, such as the NPX-SPI-2 and the NPA device (available soon on CDI) use units in psi to make things simpler for its customers.
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