a coaxial cable 50 this cable leads to appropriate electronic signal conditioning circuitry not shown functioning in known manner to produce a measurement signal adapted for use in an industrial process instrumentation system the signals produced by the piezo electric crystal are quite intense relatively speaking and especially considering the small size of the various flowmeter elements involved such intense signals result from that fact that strong pressure pulses are developed at the diaphragms 46 48 this in turn results in part from the provision of impulse ports 32 34 having large cross sectional areas and from the use of corresponding cross sectional areas for the pressure chambers 40 42 further improvement is effected by the design characteristic providing a very short distance between the impulse ports and the diaphragms 46 48 in the preferred embodiment the spacing between the impulse ports and the bottom of the sensor body 44 is about as small as it can be e g the thickness of the flow tube wall strip 52 is only about 0 1 34 or so referring again to fig5 the sensor housing 14 is formed at the time it is cast with a recess generally indicated at 53 which overall is generally circular in cross section but which includes an overlapping rectangular sector into which the sensor body 44 is fitted this sensor body is a self contained unit having all of.