| 摘要 |
In a method for in-situ calibration of quantity measurement of a fluid flowing in a channel, the amount of the fluid flowing through is measured in a <i>per-se</i> known way by a measuring means. The improvement of the method is in that the measuring means of the volume of the fluid is disconnected from the fluid flow, measuring fluid is accumulated in a certified and pre-determined amount on site of the calibration, this certified and pre-determined amount of measuring fluid is led through the measuring means with a pre-determined volume flow, in the course of which the volume values measured by the measuring means are saved, then the measured volume values and the calibrated standard real values of the fluid led through is compared to each other and, with this, the quantity measurement of the flowing fluid is calibrated. The invention has as its subject an apparatus for in-situ calibration of quantity measurement of a fluid flowing in a channel, too, wherein a flow measuring means measuring the volume of the flowing fluid is arranged in a measuring shaft, and the flow measuring means is coupled to a <i>per-se</i> known data collecting and, preferably, data transmitting electronic unit. The improvement of the apparatus is in that it comprises a calibration tank (17) having an officially certified volume and being erected on site of the measurement, said calibration tank (17) being connected to a source of a measuring liquid as well, at its outlet, to a measuring conduit (19) discharging into said channel (1) before the flow-meter (7) seen in direction of flow of liquid within the channel (1), before calibration, the calibration tank (17) contains measuring fluid in a pre-determined and certified amount, and the measuring conduit (19) has at least one draw-off valve means for controlling the flow of the measuring fluid in a certified way.
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