micro-measurements@vishay.com
Diaphragm Patterns
Vishay Micro-Measurements
Document Number: 11523
Revision 10-Jan-03
www.vishaymg.com
103
Special Purpose Sensors - Diaphragm Patterns
Strain gages are frequently used in pressure transducers
incorporating a circular diaphragm as the spring element.
The full-bridge patterns shown on this page were designed
specifically to take maximum advantage of the strain
distribution on a rigidly clamped diaphragm of uniform
thickness, and represent an abbreviated selection of gages
available for this application.
The actual design and development process for building
pressure transducers “in-house” requires careful study be-
fore arriving at the best compromise between sensitivity, lin-
earity, and frequency response. Vishay Micro-Measurements
Tech Note TN-510, Design Considerations for Diaphragm
Pressure Transducers, outlines some of these design con-
siderations. For more information, contact our Transducer
Applications Department.
Most pressure measurement applications can be handled
with commercially available transducers. These gages are,
however, an excellent choice when (1) there is no
commercially available product, or (2) the application
requires modification of an existing component to sense
pressure.
1
Minimum Order Requirement (MOR) may apply.
2
Option SP70 circular trim is available in EA Series only.
3
A minimum 0.005 in (0.13 mm) radius is recommended on a machined diaphragm section.
GAGE PATTERN
AND DESIGNATION RES. CIRCULAR MINIMUM MATRIX
Actual size shown IN PATTERN TRIM DIAPHRAGM SIZE
Insert desired S-T-C No. in spaces marked XX1OHMS DIAMETER DIAMETER2DIAMETER3(SQUARE)
EA-XX-182JC-120
120 ±1.0% 0.182 0.200 0.210 0.26
EA-XX-182JB-350
350 ±1.0% 4.62 5.08 5.33 6.6
SA-XX-182JC-120
120 ±2.0%
SA-XX-182JB-350
350 ±2.0%
EA-XX-228JC-120
120 ±1.0% 0.228 0.250 0.260 0.30
EA-XX-228JB-350
350 ±1.0% 5.79 6.35 6.60 7.6
SA-XX-228JC-120
120 ±2.0%
SA-XX-228JB-350
350 ±2.0%
SK-XX-228JC-350
350 ±2.0%
EA-XX-364JC-120
120 ±0.5% 0.364 0.400 0.410 0.46
EA-XX-364JB-350
350 ±0.5% 9.25 10.16 10.41 11.7
SA-XX-364JC-120
120 ±1.0%
SA-XX-364JB-350
350 ±1.0%
SK-XX-364JC-350
350 ±1.0%
EA-XX-455JC-120
120 ±0.5% 0.455 0.500 0.510 0.56
EA-XX-455JB-350
350 ±0.5% 11.56 12.70 12.95 14.2
EA-XX-455JB-10C
1000 ±0.5%
SA-XX-455JC-120
120 ±1.0%
SA-XX-455JB-350
350 ±1.0%
SA-XX-455JB-10C
1000 ±1.0%
SK-XX-455JC-350
350 ±1.0%
EA-XX-500JD-120
120 ±0.15% 0.500 — 0.510* 0.70
WA-XX-500JD-120
120 ±0.3% 12.70 — 12.95* 17.8
WK-XX-500JD-350
350 ±0.3%
SA-XX-500JD-120
120 ±0.3%
SK-XX-500JD-350
350 ±0.3%
DIMENSIONS
*Normally used on 1-in (25.4-mm) diameter or larger
diaphragms.
Circular trim, Option SP70, not available.
