/ APPARATUS FOR CALIBRATING A FLOWMETER AT MICROFLOW IN FULL PIPE AND NON-FULL PIPE USING BYPASS

摘要

The present invention relates to an apparatus for calibrating a micro-flow rate in a full pipe and a non-full pipe using bypass, capable of providing a calibration result with high reliability in a low flow rate section with respect to a flowmeter to be calibrated. According to the present invention, the apparatus comprises: a first reservoir storing fluid; a full-pipe type first flowmeter to be calibrated; a first reference flowmeter measuring a reference flow rate value compared with a flow rate value of the first flowmeter to be calibrated; a first pipe to be calibrated, having the first flowmeter to be calibrated installed therein and allowing the fluid to flow; and a reference pipe having the first reference flowmeter installed therein and connected to the first pipe to be calibrated to allow the fluid to flow. According to the present invention, the apparatus additionally comprises: a micro-reference pipe bypassing a part of the reference pipe. The first reference flowmeter is installed in the micro-reference pipe and the fluid flows along a flow path which is branched from a first branch point of the reference pipe, is joined at a second branch point of the reference pipe through the micro-reference pipe, and is connected to the first pipe to be calibrated. The micro-reference pipe has a cross section of 1/10 to 1/30 with respect to the first pipe to be calibrated so that the flow rate of the fluid flowing in the first pipe to be calibrated becomes a low flow rate of 0.01 to 0.1 m/s.