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Vishay Measurements Group
Interactive Guide
Tech Notes
TN-510
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Design Considerations For
Diaphragm Pressure Transducers
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DIAPHRAGM STRAIN GAGES
Micro-Measurements manufactures two different strain gage configurations (Fig. 2a and b) for use on diaphragm pressure transducers. The traditional circular pattern as shown below (a) has been designed to take advantage of the orientation of the tangential and radial strain fields described above. Taking account of the sign difference in the strains sensed by the radial and tangential grid elements, and dividing the elements into symmetrical pairs, permits incorporating a full bridge into a single strain gage. In terms of optimizing the strain gage design, the solder tabs have been located in a region of low strain. 
Micro-Measurements diaphragm strain gages for
pressure transducers.
The linear gage configuration shown above (b) functions in the same manner as the circular version with only minor differences in total gage output ( 
).
1
The main advantages of using a linear design are
ease of installation (less surface area to bond) and
generally lower gage cost.
(continued...) 1. For a more detailed analysis of circular versus linear diaphragm strain gages, request a copy of Influence of Grid Geometry on the Output of Strain-Gage-Based Diaphragm Pressure Transducers by R.B. Watson (available from Vishay Measurements Group, Inc.). 
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