Building a fluid with standard watch (gas and liquid) in the process of discharge standard device, the fundamental of standard watch calibrating and method are the focus that pays close attention to with the industry all the time. The calibrating principle that watch of watch of speed type standard, critical level, volume is being used in technical column is the watch of a few kinds of standards such as standard watch, method will check in Chinese discharge net henceforth. Mix with only station respectively the computational principle of shunt-wound calibrating flowmeter, data processing and error analysis spread out to discuss and be discussed, have the characteristic of continuity, rigorous sex, attention sex and applicability. The member that ask colleague and network and expert scholar pay close attention to this one heat.
The fundamental means that the principle that expresses only station level this to express calibrating flowmeter with respect to speed type standard and method provide this column to express calibrating flowmeter as the standard (one) . Below period the fundamental that expresses calibrating flowmeter for shunt-wound standard and method (2) .

One, if the system of flowmeter of calibrating of unit level watch pursues one

Graph system of flowmeter of calibrating of watch of one unit level

The graph is shown, express calibrating system for unit level, standard watch and be established ties to be on the conduit of same valve diameter by check watch T. Below the case that decides in concealed of going from place to place, any mass flow Qm that always had spread two lists are equal. According to this one fundamental, how to apply when calibrating flowmeter.

2, fall for liquid circumstance in calibrating medium, by the appearance coefficient Kt of the flowmeter of check, if adopt a standard,watch S is mixed be parted to be Qms and Qmt by the mass flow of check flowmeter T. The mass flow that expresses through the standard and be parted to be by the mass flow of check flowmeter:
S of ρ of Qms = Qvso
T (1 of ρ of Qmt = Qvto)
The Qvs in type - the bulk discharge M that expresses through the standard³/ H;
Qvt - pass by the bulk discharge M of check flowmeter³/ H;
ρ_S- the fluid density Kg/m that expresses through the standard³;
ρ_T- pass by the fluid density Kg/m of check flowmeter
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