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II. DESIGN AND FUNCTION
Operation of the turbine gas meter is based on the principle of proportionality of the speed
of rotation of a turbine rotor to the linear velocity or the volumetric flow of gas. The gas
flowing into the gas meter (fig. 2) is directed via an inlet straightener into the measurement
assembly and triggers the rotation of the rotor. The rotational motion of rotor is transmitted
to the counter by means of cog gears and magnetic coupling. The counter mechanism totals
up the volume flowing through the device, and an 8-digit counter indicates the total volume.
Each gas meter of the CGT-02 series is verified in the range of Q
min
to Q
max
(Table 2),
and in that range the accuracy of the meter is verified.
Fig. 2 Cross-section of the turbine gas meter CGT-02