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Industry Information
Turbine meters will change their meter coefficients as they run longer
2012-4-13 9:23:17

在安装、使用和维护过程中应注意以下问题:1、测量介质的流体流速不均匀和旋涡流的产生是影响涡轮流量计测量精度的主要原因,要消除流体流速不均匀和旋涡流的产生,就必须在涡轮流量计的上游有足够长得直管段。 During the installation, use and maintenance of the turbine flowmeter , the following issues should be paid attention to: 1. The uneven flow velocity of the measuring medium and the generation of vortex flow are the main reasons that affect the measurement accuracy of the turbine flowmeter. It is necessary to eliminate the uneven flow velocity and vortex flow. It is necessary to have a sufficiently long straight pipe section upstream of the turbine flowmeter. The turbine flowmeter installation requirements generally include a straight pipe section of more than 15D upstream of the turbine flowmeter and a straight pipe section of 4D downstream to ensure measurement accuracy. If restricted by the installation site, the front straight pipe section of the turbine flowmeter cannot reach 15D At the same time, a tube bundle rectifier should be installed in the upstream straight pipe section. 2. The installation location of the turbine flowmeter must not have strong mechanical vibration and strong electromagnetic interference; during welding and installation, there must be no welding slag and flange gaskets protruding into the pipeline. The upstream control valve of the turbine flowmeter must be a fully open ball valve or Gate valve, so as not to affect the flow state of the measured medium. 3. The failure of the turbine flowmeter is mostly due to the wear of the turbine bearing and the impeller being stuck. This type of failure can be solved by replacing the bearing or removing debris on the impeller. However, the turbine flowmeter is a precision instrument with a tight assembly, replacement of accessories or After reassembly, the meter coefficient of the turbine flowmeter will be changed. Therefore, to ensure the measurement accuracy of the meter, the meter coefficient should be recalibrated after replacing the parts or reassembling. 4. Turbine flowmeters will change their meter coefficients as the operating time increases or replacement parts, so the turbine flowmeters should be re-calibrated. During the calibration process, pay attention to: the medium used for the calibration must be the same or the viscosity of the measured medium Similar media, different media have different instrument coefficient characteristic curves; if the turbine flowmeter is used where high measurement accuracy is required, the calibration should be performed as a whole together with the straight pipe sections of the flowmeter before and after the calibration In order to eliminate the additional error of the straight pipe section before and after the turbine flowmeter.


在安装、使用过程中会遇到很多问题,现在我公司技术人员将一些常见的故障分析如下:一、流体正常流动无显示,累积量数不增加1、供电电路或信号电路断路或接触不良;排除方法:用万用表检查,排除故障点。 Turbine flowmeters will encounter many problems during installation and use. Now our technicians analyze some common faults as follows: 1. The fluid flows normally without display, the cumulative quantity does not increase 1. The power supply circuit or signal circuit is open or Poor contact; Remedy: Check with a multimeter to remove the fault point. 2. The printed circuit board of the display instrument, the connector is faulty or the contact is poor; the troubleshooting method: replace the printed circuit board. 3. Pre-amplifier failure; elimination method: use iron bar to move quickly under the detection head, no signal output, you should check the coil for wire breaks and solder joint desoldering. 4. The voltage supplied to the preamplifier is too low; exclusion method: increase the power supply voltage to the specified requirements. 5. The impeller is stuck and cannot be turned; Removal method: Remove the foreign matter, and clean or replace the damaged parts, and recalibrate after replacing the parts. Second, the flow rate display gradually decreases. 1. The filter is blocked, the pressure loss gradually increases, and the flow rate is reduced. Exclusion method: clear the debris in the filter. 2. The valve core on the pipeline is loose, and the valve opening degree is automatically reduced; the troubleshooting method is to repair or replace the valve. 3. Impeller is obstructed by foreign matter or foreign matter enters the bearing clearance. The increase of resistance will slow down the speed; Exclusion method: clean the flowmeter and recalibrate if necessary. 3. When the flow rate is zero, the flow rate display is not zero, and the displayed value is unstable: 1. The transmission line is shielded and grounded badly, and the external electromagnetic field interferes; Exclusion method: Check the grounding to eliminate the interference. 2. Pipe vibration causes the impeller to shake; Exclusion method: strengthen the pipeline or install brackets before and after the flowmeter. 3. Shut-off valve leakage; exclusion method: repair or replace the valve. 4. The internal circuit boards of the display or the electronic components are deteriorated and damaged, which causes interference; the elimination method: adopt the "short circuit method" or check one by one to find the fault point. 4. The displayed flow is not consistent with the actual flow: 1. The impeller is corroded and the blade is deformed; Exclusion method: repair the impeller or recalibrate after replacement 2. Debris obstructs the rotation of the impeller; Exclusion method: remove the debris 3. The fluid temperature is too high or too low, resulting in excessive changes in the gap between the bearing and the shaft; exclusion method: take measures to eliminate it. 4. Detect the abnormal output signal of the coil; Remedy: Check the coil insulation resistance and on-resistance. 5. Insufficient back pressure causes cavitation; Exclusion method: Install a valve downstream to increase back pressure. 6. Due to the influence of temperature, the viscosity of the fluid becomes larger; the exclusion method: increase the operating temperature. 7. Check valve is not installed, but reverse flow occurs; Exclusion method: Install check valve 8. Bypass valve leakage; Exclusion method: Close the bypass valve, and replace if necessary. 9. Distortion or pulsating flow occurs in the flow velocity distribution upstream of the flowmeter; exclusion method: find out the cause of the distortion or pulsating flow and take measures to eliminate it. 10. Display meter failure; Troubleshooting: Repair the display meter. 11. The display instrument wiring is incorrect; exclusion method: correct wiring. 12. Display meter parameter setting error; Remedy: Correct wrong parameter setting. 13, the actual flow exceeds the specified flow range; exclusion method: re-type according to the actual flow.

过程中有其他疑问,可与江苏金湖东祥仪表有限公司技术部联系。 If you have other questions during the use of the turbine flowmeter , you can contact the technical department of Jiangsu Jinhu Dongxiang Instrument Co., Ltd.