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污水池用什么液位开关比较好？

是生活污水还是工业污水，工业污水一般都有重金属之类的等等，一般东家都会要求非接触式测量，生活污水如果杂质不是很多可以用投入式，杂质沉物太多的还是非接触式比较好，污水处理应该还有一个回收过程，比如一些罐内有机水收集，一般用投入式就可以了．

2018

10-10

污水处理设施在启动前检查及预调试步骤

1、启动设备时检查好电路，接线控制柜线路是否正确，电压及电流是否符合要求，该设备控制为自动控制，采用时间继电器控制，输出采用交流接触器，本控制柜可同时控制潜污泵，风机，并结合工作情况实时监测，具有自动保护功能，还配有手动，自动控制系统。启动水泵时检查水泵管路是否有渗漏及吸水，有无堵塞。2、本设备水泵采用抗堵塞撕裂型潜污泵，其中水泵的控制由液位浮球阀通过检测污水池中的液位来完成，当液位由低到高到达工作水位时启动污水泵，液位由高到低到达低水位时，关掉工作泵(液位通过液位开关来检测)，启动风机时检查旋转方向是否正确，切忌反转。3、当调节池污水较少，液面低于水泵启动液位时、水泵停止工作。这时，为使污水设备内生物膜的正常生长，曝气机采用间歇启动。4、风机及水泵采用自动运行控制。5、设备控制中心在电控柜上按照设计编排工作时间一次完成。(无特殊情况下不得采用手动控制方式)，手动控制通过面板上按键开关，由人工控制潜污泵、风机等开启和关闭。

2018

10-10

流量仪表检定方式的选取与区别

通常，对于测量仪表的检定，会采用实流检定和干式检定两种方式。那么，检定流量仪表要采用何种方式呢？这通常要取决于计量系统对测量不确定度的要求、被检流量计的类型、用途、所具备的检定条件和检定所需费用等诸多因素。下面，为大家整理了流量测量仪表的几种检定方式及区别，希望能对大家有所帮助。 检定方式的选取1.检定结论上的不同 采用组合测量方法对流量仪表进行干式检定，是根据各有关参数的测量结果及其不确定度，按

2018

10-10

Selection and distinction of calibration methods for flow meters

Ingeneral,therearetwowaystoverifythemeasuringinstruments:realflowtestanddrytypetest.So,whatisthewaytocalibratetheflowmeters?Thisusuallydependsonthemeasurementuncertaintyrequirementsofthemeasurementsystem,thetypeanduseoftheflowmetertobetested,theverificationconditionsandtheverificationcosts,andmanyotherfactors.Next,foryoutosortouttheflowmeasurementinstrumentofseveralverificationmethodsanddifferences,Ihopetohelpyou.Selectionofverificationmethods1.DifferencesinverificationconclusionsDrycalibrationofflowmetersbymeansofcombinedmeasurementmethodisbasedonthemeasurementresultsofrelevantparametersandtheiruncertainties.Thetotaluncertaintyofflowmetersissynthesizedbyerrorprocessingmethod.Theuncertaintyrangeofflowmetersisdeterminedindirectlybyacertaindegreeofconfidence.Itcannotgivespecificerrors.Value.Itisusuallybasedonabundanttestdataandstandardizedtechnicalrequirements,maintainingtheexperimentalandconsistentcharacteristicsofmeasurement.Forexample,thestandardorificethrottledevice,criticalflowVenturinozzleandotherdryverificationtechnologieshavebeenquitemature.Takingorificeflowmeterasanexample,itsoutflowcoefficientformulaisbasedonabundantandsufficientexperimentaldata.Theerrorrangeofoutflowcoefficientgiveninthestandardisnotmorethan0.6%.Whentheuncertaintyofflowmeasurementofsyntheticorificeplateisuncertain,onlyacertainrangeofuncertaintycanbegivenwithacertaindegreeofconfidence.Real-flowverification,especiallyon-linereal-flowverification,ismostinlinewiththemeasurementcharacteristicsofaccuracy,consistency,traceabilityandexperimentation.Itcanrealizetherealcalibrationorassignmentofflowmeasurementinstruments,andensurethecontinuityandclosureofvaluetransmissionortraceability.Off-linecalibrationgivestheerrorvalueorflowmetercoefficientofflowmeterundercalibrationconditions,butbecausetheactualoperatingconditionsandinstallationconditionsaredifferentfromthecalibrationconditions,therelevantphysicalparametersofmediumandeventhemediumitselfaredifferent,infact,thiscalibrationisnotarealcalibrationorassignment.Strictlyspeaking,theoff-linecalibrationresultsofflowmeterscanonlyexplaintheirmeasurementcharacteristicsundertheverificationconditions.Mostoftheactualconditionsoffielduse,installationandoperationoftheinstrumentsarequitedifferentfromthoseundertheverificationconditions.Thiswillbringadditionalerrorstoflowmeters,andthemagnitudeofadditionalerrorsisalwaysone.Becauseofthesubjectivejudgmentofcertainexperience,off-linecalibrationhaslowrequirementsforflowmeasurementresults,orevenifthereareadditionalerrors,itcanmeettheexpectedmeasurementrequirements,whichisasimpleandeasychoice.2.Thedegreeofcorrectionfortheinfluenceofphysicalparametersisdifferent.Almostallthemeasurementresultsofflowmetersareaffectedbythephysicalparametersofthemediumundertest,butthedegreeofinfluenceisdifferent.Forthephysicalparameterswhichcanexpresstheirinfluenceontheflowmeasurementresultsbyexplicitfunction,wecanmodifythemaslongasweknowtheactualvaluesoftheseparameters,suchastherelativedensityofnaturalgas,compressionfactor,isentropicindexandsoon.Butformostflowmeasurementinstruments,theinfluenceofphysicalparametersontheirmeasurementperformanceisdifficulttoexpressaccuratelywithmathematicalformulas.Forexample,inliquidmeasurement,volumetricflowmetersandvelocityflowmetersareverysensitivetothechangeofliquidviscosity,especiallyatlowviscosityandthelowerlimitofinstrumentmeasurementrange.Thereisnogeneralformulaforviscositycorrection.Inthemeasurementofnaturalgasflow,thechangeofnaturalgasdensityhasobviousinfluenceontheconstantvelocityflowmeterssuchasturbineflowmeterandvortexflowmeter.Whenconsideringwhethertheresultsofflowmetercalibrationusingairasmediumunderlowpressurecanbedirectlyappliedtonaturalgasunderhighpressure,on-linereal-flowcalibrationcancompletelyeliminatetheinfluenceofphysicalparameters.Theonlychoiceisthatdrycalibrationandoff-linecalibrationcannoteliminatetheinfluenceofphysicalparametersontheaboveflowmeter.3.Thedegreeofcorrectionforoperationconditionsisdifferent.Theoperatingconditionsoroperatingconditionsofflowmeterdirectlyaffectitsmeteringperformance.Themostdirectinfluenceofthechangeofoperatingpressureortemperatureonflowmeteristhechangeofitsmeteringchamber.Itsindirectinfluenceisthephysicalpropertiesofthemediumundertest,suchasviscosityanddensity.Theindirectinfluencecanbeconsideredwhenmodifyingtheinfluenceofphysicalparameters.Becauseofthecomplexityofthestructureandshapeoftheflowmeterandthediscretenessoftheassembly,itisalmostimpossibletoaccuratelymodifyitscavitywiththechangeofoperatingconditionsbyusingthecalculationmethod,nortofittheempiricalformulatomeettheaccuracyrequirementsforallflowmetersaccordingtothetestdata.Forvolumetricflowmeters,thechangeofmeasurementchamberwillleadtothechangeofvolumeasmeasurementreference,andthechangeofinternalleakage,whichwillaffecttheflowmeasurementresults.Forthespeedflowmeter,thechangeofoperatingconditionswillcausethechangeofflowarea,whichwillleadtothechangeofinstrumentcoefficients.Iftheoperatingconditionsofflowmeterscanbethesameorclosetotheactualuse,theoff-l

2018

10-10

What liquid level switch is better for the sewage pond?？

First,lookattheenvironment.Isdomesticsewageorindustrialsewage,industrialsewagegenerallyhasheavymetalsandsoon,thegeneralownerswillrequirenon-contactmeasurement,domesticsewageiftherearenotmanyimpuritiescanbeusedininput,impuritysedimenttoomuchornon-contactisbetter,Sewagetreatmentshouldalsohavearecoveryprocess,suchassome.Thecollectionoforganicwaterinthetankisusuallydonewithinput.Inconclusion,payattentiontothefollowingpoints:1、impuritysettling,non-contact2、corrosive,non-contact3、FoamozonetankenvironmentalpressureinputGenerallyspeaking,thenon-contacttypeusesultrasonicwave,whichcanbeselectedaccordingtothesite.Ifitmeetsthepressureinputtype,thepressureinputtypeshouldbeusedasfaraspossible,Inaddition,theultrasonicwavecannotbeusedinthesealedtankwithlargerpressure.Afewdaysago,IsawtheultrasonicliquidlevelgaugeofourcompanyatthesiteofShennancircuitsewagetreatmentandreuseprojectinShenzhenafewdaysago,Theprojectinvestedmorethanonehundredmillion,andtheultrasonicliquidlevelmeterdidnotshownooutput,Itwasanorganicwatercomprehensivewatercollectingtankinitsworkshop.Thefoaminthetankwasabout2CM.

2018

10-10

Inspection and pre commissioning steps for sewage treatment facilities before start-up

1、Check the circuit when starting the equipment, whether the wiring of the control cabinet is correct, whether the voltage and current meet the requirements. The equipment is controlled by automatic control, time relay control and AC contactor for output. The control cabinet can control submersible sewage pump and fan simultaneously. It also has automatic protection function combined with real-time monitoring of working conditions,It also has manual and automatic control system. When starting the pump, check whether there is leakage and water absorption in the pump line, and whether there is any blockage.

2018

10-10

什么是液位开关

什么是液位开关液位开关，顾名思义，就是用来控制液位的开关，从形式上主要分为接触式和非接触式，非接触式的如电容式液位开关，接触式的例如浮球式液位开关、电极式液位开关，电容式液位开关也可以采用接触式方法实现。

2018

10-10

水位开关有什么用

位开关在生活中有很大的作用，它可以用来控制线路中供水的开启和停止。其中的数位开关还能够实时控制水位的高度，对线路中水量的多少进行实际控制。我们对于多数场合下的供水设备控制，都是“后知后觉”的，总是在水位高度超过临界值的时候才会对供水线路进行切断，可以这样做的话就会造成了水资源的浪费。所以这时候就需要安装一个水位开关，来避免这种状况的发生。节约用水，不仅是对环境的保护，对于自身也能减少一定的经济损失

2018

10-10

What is liquid level switch?

Whatisliquidlevelswitch?Liquidlevelswitch,asitsnameimplies,isusedtocontroltheleveloftheswitch,mainlydividedintocontactandnon-contactform,non-contacttypesuchascapacitivelevelswitch,contacttypesuchasflo

2018

10-10

What's the use of water level switch?

Positionswitchesplayanimportantroleinlife.Theycanbeusedtocontroltheopeningandstoppingofwatersupplyinthecircuit.Thedigitalswitchcanalsocontroltheheightofwaterlevelinrealtimeandcontroltheamountofwaterin

2018

10-10

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Dalian Mach Liquid Level Control Electrical Co., Ltd

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86-0411-86660798/81230836

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Add：10 Xinfeng Street, Ganjingzi District, Dalian City
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E-mail:info@dlmac3.cn

 

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