Abstract: A quartz tuning fork in a chamber adjacent a gas pipeline carrying a turbine flowmeter. The chamber is connected across the flowmeter turbine to receive a gas at a flow rate high enough to cause the tuning fork to vibrate. A main output frequency is developed which is directly proportional to the product of a function of the tuning fork period of vibration and the turbine meter output signal frequency. The main output frequency is then counted and is displayed on an indicator, the constants of the circuit being so selected that the indicator displays total flow in units of mass. The density sensor measures the gas density at the turbine flowmeter rotor location. This obviates the requirement for expansion factor corrections.

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 assembly including a web partly covering a bore in an annular support, the web having a central hole therethrough, a probe shaft sealed through the hole, and a compressed packing in the bore bearing upon the probe shaft.

Abstract: A differential pressure .DELTA.p is detected across an orifice plate in a pipe section. The same differential pressure is also allowed to drive a turbine meter. The turbine meter is conventional and produces electrical output pulses at a frequency f.sub.1 proportional to the volume flow rate therethrough. It then has been found that the properties of a fluid in the pipe section and in the turbine meter may be found automatically by electronic computation of first and second ratios.DELTA.p/f.sub.1and.DELTA.p/f.sub.1.sup.2respectively, where the first and second ratios are proportional to mass flow rate of the fluid in the pipe section or total mass flow when the mass flow rate is integrated with respect to real time, and the density of the fluid respectively.

Abstract: A method of calibrating a densitometer to meter two gases of different molecular structures by empirically deriving a hole size function of the indicated error for one gas in the density equation of the other and performing tailored reboring of the hole in a production unit in accordance with the hole size derived from the function by determining the full scale error thereof.

Abstract: The heat of combustion K.sub.1 of a gas is determined by burning the gas in air in a chamber and cooling the combustion products with air to a final temperature equal to the air and gas input temperature. With mass flowmeters, the gas flowrate W.sub.1, the cooling air flow rate W.sub.3, a T.sub.2 temperature sensor, and a sensor for the cooling air input temperature T.sub.3 are employed with a computer to derive K.sub.1 as follows: ##EQU1## where K.sub.3 is the specific heat of the cooling air. Alternatively an outlet temperature T.sub.1 may be substituted for T.sub.2.

Abstract: A welded vibration densitometer probe to obviate frequency shifts due to temperature changes.

Abstract: A plug for a vibration densitometer probe to obviate calibration shifts caused for a number of reasons.

Abstract: A vibration densitometer having a probe including a hollow cylinder.

Abstract: A net oil computer which can gate out turbine meter pulses by producing gating pulses of time widths T.sub.o and/or T.sub.w directly proportional to percent oil, by volume, and/or percent water, by volume, respectively, flowing as a mixture in a pipeline, where ##EQU1## K is a constant, D.sub.M IS THE MEAN DENSITY OF THE MIXTURE,d.sub.w is the water density, andd.sub.o is the oil density.A densitometer provides the d.sub.m input. The water density does not vary significantly with temperature. A temperature probe can be used to compensate for changes in d.sub.o due to changes in temperature.

Abstract: A vibration densitometer having a permanent magnet biased magnetostrictive drive unit.

Abstract: A plug for a vibration densitometer probe to obviate calibration shifts caused for a number of reasons.

Abstract: An electromechanical oscillator having a feedback shifted alternately to two different phases, and two digital function generators to derive viscosity and density signals on a time shared basis.

Abstract: A vibration densitometer probe is employed with a shield that produces vortex shedding. The probe has a vane that is vibrated at an amplitude modulated acoustic frequency. The envelope may be employed to compute mass flow rate. The said acoustic frequency may be employed to compute density and/or mass flow rate.

Abstract: An improved well for a densitometer probe for immersion in a pipeline around the probe to effect a flow of a portion of the fluid flowing in the pipeline through the improved well and through and around the probe while increasing the usable range of the instrument.

Abstract: A vibration densitometer probe with a shield and well which have solved a calibration shift problem involving a calibration shift that occurred when the probe was placed in different gases or in the hollow interiors or pipelines of different sizes or geometries or the probe was placed in the same container or pipeline with different orientations. Unusual shield perforations and ports also improve operation.