Abstract: A pressure/differential pressure measuring device having a range plate with static and differential pressure sensors mounted therein. A high pressure isolation plate is mounted on one side of the range plate with a high pressure diaphragm mounted on the side of the high pressure isolation plate away from the range plate and sealed thereto forming a first fluid chamber between the inside of the high pressure diaphragm and the high pressure isolation plate side of the sensor assemblies. A low pressure isolation plate is mounted on the other side of the range plate with a low pressure diaphragm mounted on the side of the low pressure isolation plate away from the range plate and sealed thereto forming a second fluid chamber between the inside of said low pressure diaphragm and the low pressure isolation plate side of the sensor assemblies.

Abstract: Apparatus for producing an output signal or indication directly proportional to the density of one or more gases or liquids. A probe holds a vibrating vane immersed in a fluid. The probe is suspended from a pipeline flange by a boss that has upper and lower portions connected together by a thin annular cantilever-like disc in a plane transverse to the probe axis. The boss supports telescoped inner and outer cylinders along an axis normal to the probe axis. The cylinders have an interference fit. The outer cylinder has a uniform outside diameter but an unstressed inside diameter that increases in direct proportion to its length. The same is true of the outside diameter of the inner cylinder. The inner cylinder supports the vane. A seismic mass which vibrates the boss is unsupported except at one end.

Abstract: A quartz tuning fork is provided which may be employed in several instruments for measuring the properties of fluids. The tuning fork may be employed, for example, in a gravitometer, a barometer, an altimeter or a temperature sensor.

Abstract: A vibration densitometer probe including an internal piezoelectric crystal, a canted vane, and an isotropic ring to support the vane.