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Title: Kinetic Type Indicating And Recording Instruments For Determining Specific Gravity
Author: F. B. Leslie
Source: 1965 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1965
Abstract: Kinetic energy is energy associated with motion of any substance and, if all other conditions are equal, it is proportional to density. This principle is the basis of an instrument which was developed about 41 years ago for automatically measuring the specific gravity of gases. It is the object of this class to explain the theory, review operating techniques and to describe testing, servicing and calibration. THEORY OF OPERATION The operation of the Kinetic type Gravitometer is illustrated in the phantom view, Figure 1. The chassis forms two cylindrical chambers which are gas tight to each other and to outside air, and have inlet and outlet connections. Each chamber contains an impeller and an impulse wheel, mounted on separate shafts, facing each other but not touching, similar to the arrangement used in automotive fluid couplings. An electric motor and drive belt rotate the impellers at the same speed but in opposite directions. Heavy aluminum covers enclose and protect the entire mechanism

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