On-line quantitative testing device for special instrument

The invention belongs to the technical field of automatic control of centrifugal factories, and particularly relates to an online quantitative testing device for a special instrument. According to the device, a device bottom support is arranged at the bottom in a device shell, and a testing cavity is formed in the device bottom support; a special meter air inlet and a special meter air outlet are welded to the top of the testing cavity and connected with a special meter through a special meter quick connector. A working substance gas inlet and a quantifying agent gas inlet are welded on the left side of the testing cavity, a quantifying agent device is connected to the quantifying agent gas inlet of the device, a working substance gas outlet is welded on the right side of the testing cavity and is connected with a valve front material pipe, and the other end of the valve front material pipe is connected with a three-way instrument valve; the right side of the three-way instrument valve is connected with a dow