2 Overview
CNIM-RM series gas roots flowmeter belonging to high-precision gas flow measurement instruments, are widely used in town gas industry and trade measurement flow meter using innovative technology and modular structural design concept, the realization product of modular production spanned the Ephesians, making products while guaranteeing high reliability, high accuracy, reduce procurement costs and maintenance costs.

2 Working principle
Gas roots flowmeter belonging to volume type measurement instrument, through two a rotating lumbar round and shell body composition volume fixed of measurement room, implementation on gas of accurate measurement, in each rotating cycle, gas of volume for through measurement indoor four times was moved of fixed units volume of and, lumbar round speed and flows through flowmeter of gas volume into is proportional to the, lumbar round of turns through a special design of deceleration institutions and magnetic coupled links device output to external secondary count count unit, The count count unit can be a mechanical counter or an electronic counter, electronic counter is one of the most volume correction instrument of communication and other functions.

2 Features
Flowmeter table structure, square, to support the waist round before rotating shaft and bearing plate, the solid durability design, make flowmeter with good mechanical stiffness. Typical symmetric waist round square structure design, increase of unit length waist wheel area, shorten the waist wheel relative length, reduce the appearance of installation stress and dirty gas sensitivity, greatly reduce the instrument leak amount, expand the flow range degrees. The back-up bearing spindle rotation flow meter installed in the end of the simultaneous gears, makes the gauge more simple maintenance and assembly site can realize on-line maintenance. The single end synchronous transmission count, shorten the table body relative length size, save with empty space. The multifunctional magnetic coupling coupling, with a variety of forms for auxiliary count count unit connection and counting unit technologies to promote reading, the realization of different measurement and control function. Independent module structure of the mechanical counter possesses favorable commonality and interchangeability, reduce accessories inventory, and the mechanical counter has a variety of low frequency pulse code signal output and protection function. Wide range of flow degree (up to 1:16 0), high measuring accuracy, low tumor-initiating flow rate, pressure loss small.