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Miniature piezoelectric accelerometer
1 - 26 000 Hz, 1.5 pC/g | 4374 Bruel and Kjaer

Type 4374 is a piezoelectric, Planar Shear accelerometer. The integrated side cable terminates with a 10 32 UNF connector. Type 4374 is mounted on the object adhesively.

High-level, high-frequency measurements
Measurements in confined spaces
Measurements on delicate structures
Vibration testing and analysis


This piezoelectric accelerometer may be treated as a charge source. Its sensitivity is expressed in terms of charge per unit acceleration (pC/g).

In the Planar Shear design, the piezoelectric element undergoes shear deformation as in the DeltaShear® design. Two rectangular slices of piezoelectric material are arranged on each side of a rectangular centre post. Two masses are held in position using a high tensile strength clamping ring. The ring prestresses the piezoelectric elements to give a high degree of linearity. The charge is collected between the housing and the clamping ring. The piezoelectric element used in Type 4374 and Type 4734-S is PZ 27. Type 4734-L is PZ 23. The housing material is titanium.

The sensitivity given in the calibration chart has been measured at 159.2 Hz and an acceleration of 10 g. For 99.9% confidence level, the accuracy of the factory calibration is ± 2%.


Other Bruel and Kjaer products


Measurement frontends

Hand-held instruments

Shakers and exciters