There is no medium flow in the pipeline of vortex flowmeter,but there is signal output or instantaneous flow which is obvious.Introduction of Xi'an Huaheng Instrument:

 

　　1.首先確認(rèn)渦街流量計的測量管道內(nèi)確實(shí)沒有介質(zhì)流動或擾動，檢查管道振動強(qiáng)度是否過大，若震動大請按照如下方法進(jìn)行減震：在流量計下游2D處加裝管道支撐點(diǎn)；在滿足直管要求的前提下，加裝軟管過度；

 

　　1.Firstly,it is confirmed that there is no medium flow or disturbance in the measurement pipeline of the vortex flowmeter.Check whether the vibration intensity of the pipeline is too large.If the vibration is too strong,please reduce the vibration by following methods:installing pipeline support points at the 2D downstream of the flowmeter;installing excessive hoses on the premise of meeting the requirements of the straight pipe;

 

　　2.將靈敏度電位器逆時針調(diào)整直到?jīng)]有信號輸出或瞬時流量回零為止。在調(diào)整電位器時，應(yīng)盡量緩慢一些，每調(diào)整5度角時，要停頓10秒鐘以上，以便觀察輸出是否回零。

 

　　2.Adjust the sensitivity potentiometer counterclockwise until there is no signal output or instantaneous flow back to zero.When adjusting the potentiometer,it should be as slow as possible.When adjusting the angle of 5 degrees,it should stop for more than 10 seconds in order to observe whether the output returns to zero.

 

　　渦街流量計信號輸出不規(guī)則、不穩(wěn)定或瞬時流量不穩(wěn)定；

　　首先檢查管道中介質(zhì)流量是否超出傳感器的可測流量范圍；

　　如果介質(zhì)流量在可測范圍內(nèi)，檢查前后直管段是否符合要求，并且確認(rèn)管道中介質(zhì)是否處于穩(wěn)定流動狀態(tài)，管道內(nèi)無兩相流或脈動流現(xiàn)象；

　　檢查管道振動強(qiáng)度是否過大；

　　檢查儀表周圍是否有較強(qiáng)電干擾信號，若有加強(qiáng)屏蔽和接地；

　　檢查傳感器是否被玷污、受潮、受損、引線接觸不良，若有請清洗或更換傳感器，緊固引線；

　　檢查傳感器安裝是否同心或密封墊是否凸入管內(nèi)，若有安裝情況，調(diào)整密封墊內(nèi)徑；

　　檢查傳感器靈敏度的高低，調(diào)整靈敏度；

　　檢查工藝流程是否穩(wěn)定，調(diào)整安裝位置；

　　檢查發(fā)生體上是否有纏繞物；

　　查看管道內(nèi)是否存在氣穴現(xiàn)象，若有降低流速，增加管內(nèi)壓力。

 

　　The signal output of the vortex flowmeter is irregular,unstable or the instantaneous flow rate is unstable.

　　First,check whether the medium flow in the pipeline is beyond the measurable flow range of the sensor.

　　If the medium flow rate is within the measurable range,check whether the straight pipe section before and after the inspection meets the requirements,and confirm whether the medium in the pipeline is in a stable flow state,there is no two-phase flow or pulsating flow in the pipeline;

　　Check whether the vibration intensity of the pipeline is too large.

　　Check whether there is a strong electrical interference signal around the instrument,if there is enhanced shielding and grounding;

　　Check whether the sensor is stained,damped,damaged,and the lead is not in good contact.If so,clean or replace the sensor and tighten the lead.

　　Check whether the sensor installation is concentric or whether the gasket is protruded into the tube,and adjust the inner diameter of the gasket if there is installation.

　　Check the sensitivity of the sensor and adjust the sensitivity.

　　Check the stability of the process flow and adjust the installation position.

　　Check for entanglement on the body.

　　Check whether there is cavitation in the pipeline.If there is a decrease in flow rate,increase the pressure in the pipeline.

 

　　PS:天津壓力變送器如何安裝，渦街流量計信號輸出不準(zhǔn)確或不穩(wěn)定解決辦法？

　　PS:How to install the pressure transmitter in Tianjin,and how to solve the problem of inaccurate or unstable output of vortex flowmeter signal?