The gas meter (hereinafter referred to as the meter) is designed to measure the volume of natural gas in accordance with GOST 5542-87 and liquefied petroleum gas vapor in accordance with GOST 20448-90 when conducting commercial metering at gas consumption facilities. The main consumers of the meter are citizens – individual consumers of natural gas.
Volumetric measurement by the counter is carried out due to the rotation of two rotors, which occurs due to the pressure difference between the inlet and outlet of the meter. The measuring volume of the meter is determined by the space between the inner wall of the housing and the surface of the rotors. For one complete rotation of the rotors, the measurement chambers are filled four times and gas is expelled from them. Each turn of the rotor shaft corresponds to a strictly defined amount of gas passing through the meter.
The counter consists of two main units located in one case: meter and counting mechanism. The gauge consists of a body and two eight-shaped rotors placed in it, which are mutually perpendicular in relation to each other and rotate in opposite directions.
The meter case is closed on both sides by walls, on which two pairs of bearings are installed, which are the supports of the rotors. On the shafts of the rotors are installed synchronizing gears, ensuring the proper position of one rotor relative to another when they rotate at the time of passage of gas.
The axis of one of the rotors is connected to the gearbox of the counting mechanism, the gear ratio of which is chosen so that the measured gas volume is read directly in cubic meters.
The limits of the permissible relative error of the counter during the release from production and after repair are:
± 3,0 % – in the range of volume flow rates from Qmin to 0.1 Qmax;
± 1,5% – in the range of volume flow rates from 0.1 Qmax to Qmax.
The limits of the permissible relative error of the meter during operation are:
(minus 6 ÷ + 3) % – in the range of volume flow rates from Qmin to 0.1 Qmax;
± 3 % – in the range of volume flow rates from 0.1 Qmax to Qmax.
The service life of the meter at least 20 years.