Testing and inspecting device of flow meter

Abstract

Abstract PURPOSE: To accomplish the test and calibration in a simple but highly accurate manner by arranging a normal flow meter and a sonic nozzle upstream and downstream of a passage, respectively, thereby to eliminate the deteriorating influence upon the flow rate measurements. CONSTITUTION: Atomospheric air or other gases are compressed by a compressor 5, and a storage tank 6, which can be held at a necessary pressure, is charged with the compressed air or other gases through a suitable filter 4 for filtering dusts, mists and the like. The resultant fluid is discharged under a sonic condition into the atmosphere from a downstream standard sonic nozzle or a sonic nozzle 3 to be tested through a flow meter to be tested or a standard flow meter 2, which is arranged at a downstream position. Incidentally, the sample may be either the flow meter 2 or the sonic nozzle 3, and the standard element in that case is calibrated in advance by another method. As a result, the disturbing phenomena or other deteriorating influences due to the provision of the sonic nozzle upstream of the flow meter are eliminated so that the testing and calibrating operations can be accomplished in an easy but highly accurate manner. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Harumi Toda
• 👤 Hiroshi Yamamoto
• 👤 Toei Okuda

Bibliographic Details