Baode flowmeter selection attention points information

Baode flowmeter selection attention points
    Sewage treatment inflows and discharges, wastewater discharge from industrial and mining enterprises, and wastewater and wastewater from water conservancy projects and agricultural irrigation channels need to be selected according to actual different flows (such as full pipe flow and half pipe flow). A flow meter measures these sewages. Sewage flow meters are recommended when natural flow or pipe pressure is relatively small and the pipe is not flowing.
    1. The scope of use of the sewage flowmeter is used in conjunction with the measuring water tank to measure the flow of water in the open channel. It is mainly used to measure the flow rate of sewage discharge ports and urban sewers in sewage plants and enterprise liquid units.
    The Baldor flowmeter is measured in a non-contact manner because the meter uses ultrasonic waves to pass through the air. Therefore, in the case of fouling and corrosive liquids, it has higher reliability than other forms of instruments. Second, the working principle of sewage flow meter The physical quantity measured directly by the flow meter is the liquid level. When measuring flow, install the amount of water in the tank.
    The measuring water trough converts the flow rate in the open channel into the level of the liquid level. The meter measures the water level in the water tank, and then calculates the flow rate according to the water level-flow relationship of the corresponding water tank.
    The main factors that may be induced by the Baldor flowmeter include: the measurement error caused by the installation of the throttling device; the measurement error caused by the parameter measurement error. Moreover, under the influence of the above error factors, a large amount of influence can be further divided, and corresponding error elimination methods also have certain differences.
    1) From the perspective of the measurement error caused by the installation and use of the throttling device, the specific influence amount and the corresponding error elimination measures include the following aspects: First, during the pressure measurement and the differential pressure measurement process, the pressure guiding tube is clogged. Or the problem of leaking. In response to this problem, it is recommended to eliminate the error by thoroughly cleaning and purging the pressure guiding tube in time and shortening the interval between regular maintenance; secondly, it is the problem of deformation and bending of the inlet position of the flowmeter orifice plate.
    For the problem, Baode Flowmeter recommends that the error should be eliminated by replacing or correcting the orifice plate in time; again, it is a problem that the natural gas flowmeter measuring tube has a large number of structures inside and causes roughness.
    For the problem, Baode flowmeter recommends replacing the orifice plate under the condition that the roughness correction is invalid, and controlling the diameter ratio in the range of 0.3 to 0.5, or directly updating the pipeline; finally, the inside of the orifice plate is large. The problem of depositing dirt.
    2) From the perspective of the measurement error caused by the parameter measurement error, the specific influence amount and the corresponding error elimination measures include the following aspects: First, the problems of pressure regulation instability and differential pressure fluctuation. For this problem, it is recommended to adopt the workflow of first pressure regulation and post-measurement, and pay attention to the maintenance management of the pressure regulator. If the performance of the regulator has certain defects, it is recommended to update it to a larger differential pressure and higher quality. The regulator optimizes its operating performance to eliminate the error; secondly, it is the problem that the relative density of the natural gas and the design parameters are large, and the defects are corrected.
    Baode flowmeter recommends that the measured value be calculated and processed into the computer in time, and the flow value should be corrected reasonably to eliminate the error. Finally, it is the problem of zero drift of the instrument. For this problem, it is recommended to eliminate this error by updating the zero drift slightly and periodically calibrating the zero.
    The Baldor flowmeter is used to measure the flow rate and send the flow signal to the control unit. The flow controller can set a signal to the regulating valve to close when the instantaneous flow rate reaches a certain value.
    It is also possible to set the cumulative flow rate to a certain value for quantitative control. The electromagnetic flowmeter has good application effect in liquid medium measurement, accurate measurement, long use time and less failure. It can be metered only if the liquid has a certain conductivity. The electromagnetic flowmeter can be used with any flow totalizer, or it can directly send signals to PLC and computer.
    The main functions of Baode flowmeter: flow lower limit setting, flow upper limit setting, flow lower limit alarm, flow upper limit alarm, small signal cutoff function, range setting, pipeline empty pipe alarm, instrument fault alarm, output: pulse signal, output Current signal.
    Flow lower limit setting function: It is mainly used in some special places. When the flow rate is lower than the set value, an alarm is issued, and the operator closes the valve or shuts down the pump as needed.
    Flow upper limit setting function: When the upper limit of flow rate is set and the flow rate exceeds the upper limit value, we can usually adjust the valve switch appropriately.
    Baode flowmeter small signal removal function: mainly used in some places, there may be some interference, we use the small signal cutoff function setting to ignore small interference signals.
    Baode flowmeter can also carry out batch control. When the batch control function is used, the instrument has built-in batch controller, which can be used for filling and feeding process to carry out fixed value batch control. If you don't need too much cost, we can also use the most stupid method, as long as the flow meter has a cumulative function, let an operator stand in front of the flow meter, press the button to stop the pump every time the set value is reached. This operation is also very reliable.
    The measuring principle is that the measuring component diaphragm in the metering chamber is used to generate continuous alternating motion under the influence of the inlet and outlet gas pressure difference, thereby continuously dividing the gas filled in the measuring chamber into a single metering volume and discharging to the outlet, and then passing through the machine. The transmission mechanism is connected to the counter, and the calculation of the single metering volume and the single metering volume is performed, so that the total volume of the gas flowing can be measured. The membrane type natural gas flowmeter has a wide measuring range and convenient installation. The requirements for the straight pipe sections before and after the table are not high; but its large volume, small measuring range, easy to be corroded, resulting in leakage and inaccurate measurement, inconvenient maintenance, only suitable for low pressure It only measures the flow of working conditions, and it is not easy to implement intelligent temperature and pressure compensation.
    The performance introduction belongs to the volumetric flowmeter. As the gas passes, the differential pressure generated between the inlet and the outlet of the natural gas flowmeter acts on a pair of waist wheels that are coupled together by high-precision synchronous wheels, thereby driving the waist wheel. Rotating, the gas filled in the metering chamber is quantitatively discharged, and then connected by a mechanical transmission mechanism and a calculator to realize gas volume measurement and data conversion. With the development of science and technology, Roots gas flowmeters are mostly used for high precision, wide range ratio, low initial flow, easy installation, maintenance and cleaning.
    The requirements for straight pipe sections before and after the flowmeter are not high, and the on-line temperature and pressure intelligent compensation can be realized, which is suitable for high and medium pressure measurement. Compared with the gas meter, the price of the Roots flowmeter is higher than that of the membrane gas meter under the same flow conditions, but the cost performance is high, and it is more economical than the membrane gas meter after comprehensive consideration.