Abstract: A densitometer calibration apparatus includes an enclosure for a pressure vessel which may be submerged in a water bath within the enclosure and through which a control fluid is circulated by a pump and a closed loop conduit arrangement to provide continuous steady state circulation of a fluid whose density is used for calibration. A second flow loop including a pump and a pycnometer are in communication with the pressure vessel for filling the pycnometer with a quantity of fluid to be weighed for density comparison with the densitometer reading. Fluid is circulated through the pressure vessel while it is submerged in the temperature controlled water bath and the pycnometer is filled and removed for weight determination at selected operating pressures and temperatures to obtain densitometer calibration parameters.

Abstract: A reciprocable piston and cylinder type flowmeter prover is calibrated by providing a liquid conducting manifold for conducting liquid to one chamber formed by the cylinder and piston while displacing fluid from the other chamber to a measuring tank, and vice versa. The prover includes a controller having sensors which sense the movement of the piston between its first and second positions and a controller interface is provided between the prover controller and a solenoid-operated valve to provide selective control over the operation of the valve while measuring prover piston displacement in both directions. Visual and audio indicators are interconnected in a controller circuit which indicates the condition of the prover during the calibration process and receives signals from the controller interface for operating the valve.