The use of gas meter scale matters needing attention

Abstract: the use of gas meter scale note information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Gas meter using note 1. When the instrument working conditions transform ( Such as the change of medium, environment temperature change, etc. ) Readjust, zero to the instrument should be. At the same time, the tube must be installed level, with level calibration. Otherwise it would be. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the use of gas meter scale considerations article details. Gas meter using note 1. When the instrument working conditions transform ( Such as the change of medium, environment temperature change, etc. ) Readjust, zero to the instrument should be. At the same time, the tube must be installed level, with level calibration. Otherwise will increase the working conditions change on the influence of the zero drift. Frame swing or more with no vibration, so should not be used on ships. 2. The equivalent of 0 & ndash; 100 kg/cm2 pressure, 0 ~ 7 standard liters/hour traffic ( Air) Within the scope of a large number of test data correlation arithmetic, use zui small square method for linear regression equation, the coefficient of correlation & lambda; Values are 0. 999-0. 9999 scope, prove the instrument has good linearity. But the linearity and range size with the flow, the greater the nonlinear, so the general range is limited to 0 ~ 4 standard l/( Air) Less than, in order to ensure good linearity. In order to measure mass flow and ensure the linearity, shunt principle can be used to extend the range of instrument. Such as take the bypass pipe, venturi tubes and orifice, range can be extended to every hour respectively dozens, hundreds, thousands of the rise, until the tens of thousands of BiaoLi party. 3. Although the specific heat of real gas varies with the different of pressure change and even some gas range is relatively large, but the instrument measuring precision stays a laurel a certain range. 4. Pipe material selection, in addition to the consideration of corrosion resistance, is better to choose material with better thermal properties. Test item nitrogen, for example, in the same 0 & ndash; 100 kg/cm2 pressure and 0 ~ 7 liters/hour traffic within the scope of testing, with the measuring accuracy of nickel pipe is 2 ~ 2. 5% while stainless steel is 3 ~ 4% ( The coefficient of thermal conductivity of nickel is about three times that of stainless steel) 。 5. Due to the gas meter must be under the condition of the gas specific heat is relatively stable to unstable work properly so that the gas composition, gas central belt entrainment and approximation gas liquefaction critical area of the working conditions as than calorific value was unstable, unfavorable use this instrument. Such as the critical point of ethylene liquefaction is 50 kg/cm2, 9. 9 ℃, found during testing pressure exceeds 30 kg/cm2, meter reading began to instability. 6. If a change in a gas medium, a new calibration should be carried out. In illustrations of the instrument, is introduced to re-mark, but only according to the two kinds of the specific heat of the gas conversion without calibration gas flow is simple and convenient, but can cause larger error, especially when working under high pressure, we found that the sensitivity of instrument is not entirely is proportional to the heat table, more to re-mark as appropriate. 7. The meter must be warmed up before use, before not fully preheat, unstable instrument. Better models, the warm-up time within two hours. 8. In use process, when the gas flow rate suddenly changed, must by heat transfer, the tube temperature distribution again, so the output signal of stability will take time. In order to reduce the hysteresis, factory set up in the electric circuit of instrument often differential network, to make the output signal rapid response. In cooperation with other instruments with traffic control is necessary. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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