簡介 標準和低斷面面積流速傳感器 美國ISCO4250速度面積便攜式流速超聲波測量儀探頭的流線型造型避免了有機物殘渣和水流中化學成分的腐蝕 密封設(shè)計能避免油脂堵塞，從而使其長期可靠運行 標準探頭適用于較大管徑，帶有高濃度懸浮固體和氣泡的混濁水流 低斷面探頭適用于淺流，水位可低至1英寸（25毫米） 可選擇電話調(diào)制器-提供獲取遠程數(shù)據(jù)，語音信息，和警報信號 可以支持不超過3個單獨的內(nèi)部4-20mA輸出 美國ISCO4250速度面積便攜式流速超聲波測量儀即便在槽或堰不適用、探頭被浸沒、滿管、過載或有逆流發(fā)生的地方 4250均可為您提供較高的測量精度，現(xiàn)場顯示和打印特點 打印顯示一體式結(jié)構(gòu) 帶有微處理器的數(shù)字探頭確保讀數(shù)穩(wěn)定（防止液位偏差） 無需量程校準現(xiàn)場一點校準 沒有溫度漂移 自動修正泥沙液位 對各種不同的液體自動增益控制 傳感器不受液位降低影響應(yīng)用場合 容量評價 入流和滲流研究 下水道溢流研究 生活污水評估 明渠流量測量技術(shù)參數(shù)液位測量方法浸入式壓力傳感液位測量范圍0.015至3.05m，可延伸至0.015-9.14m液位準確性 0.008/m速度測量方法多普勒超聲波方法頻率500KHz速度范圍-1.5至6.1m/s速度準確性-1.5至1.5m/s， 0.03m/s，1.5至6.1m/s, 2%模塊存儲溫度-40~60℃操作溫度-18 ～60℃電源12～14VDC防護等級IP65數(shù)據(jù)存儲間隔1分鐘到120分鐘可選擇模塊尺寸40.6＊29.2＊26.7cm溫度影響 0.0027m/℃標準傳感器尺寸16.8＊4.1＊3.0cm標準傳感器重量0.96kg電纜線長7.6m，可延長至15.2mThesensorontheIsco4250usespatentedDopplertechnologytodirectlymeasureaveragevelocityintheflowstream.Anintegralpressuretransducermeasuresliquiddepthtodetermineflowarea.The4250thencalculatesflowratebymultiplyingtheareaoftheflowstreambyitsaveragevelocity.The4250givesyougreateraccuracyinapplicationswhereweirsorflumesarenotpractical,orwheresubmerged,fullpipe,surchargedandreverseflowconditionsmayoccur.Withareavelocityyoudon thavetoestimatetheslopeandroughnessofthechannel.AndIsco sexclusive500kHzDopplerpenetratesfartherintodeepflowstreamsthan1MHzsystems,whoseshorterwavelengthcancausethemtogive nearsighted velocitymeasurementintypicalwastewaterapplications.TheDopplersystemcontinuouslyprofilestheflowstream,eliminatingprofilingandcalibrationrequiredbyelectromagneticsystems.StandardFeatures4200Series-Built-inflowconversionsformostapplications,includingManningformula,datapoints,orequationforspecialsituations.-Setupwithorwithoutacomputer.Allsetupfunctionscanbedoneeitherviaonboardkeypadandtwo-linex80-characterbacklitLCD,orbyconnectiontoPCwithFlowlinksoftware.-Built-indotmatrixprintergivesyouanaccurate,on-siteprintout-Internalmemorystoresover2monthsofflow,rainfall,parameter,andsampledataat15minuteintervals.-OutputsforSampleractivation,alarmoutputs-Inputsforconnectionto674RainGaugeandmultiparameterwaterqualitysonde,4250AreaVelocity-SealedArea-Velocitysensorresistsfoulingbyoilandgrease.Streamlinedshapeshedsdebris.-Choiceofstandard(10ft)andextended(30ft)levelmeasurementrange.ApplicationsAccurateopenchannelflowmeasurementwithoutaweirorflumePretreatmentComplianceStormwaterRunoffMonitoringPermitEnforcementSewerFlowMonitoringCombinedSewerOverflowStudiesInflowandInfiltrationStudiesRiverandStreamGaugingOptionsandAccessoriesChoiceofStandardandLowProfileAreaVelocitySensors.-StandardSensorisrecommendedforlargerpipesandturbidflowswithhighconcentrationsofsuspendedsolidsandentrainedair.-LowProfileSensorisrecommendedforshallowsflows,typicallydownto1 (25mm).Optionaltelephonemodem-providesremotedataretrieval,voicemessaging,anddial-outalarmconditionsAnalogOutputs-upto3isolatedinternal4-20mAoutputsMountingringsforinstallationofprobeinroundpipesfrom6to15inchesindiameterNon-resettabletotalizer674RainGauge581RTDdataretrievaldevicedownloadsupto20meters201pHmoduleaddspHandtemperaturemeasurement/loggingYSI600Multi-ParameterWaterQualityMonitorSuspensionequipment(tohangflowmeterinmanhole)SpecificationsSize(HxWxD):17.0x11.5x10.5in.(43x29x26.7cm)(withoutpowersource)Weight:17.3lbs(7.8kg)(withoutpowersource)Material:High-impactmoldedpolystyrenestructuralfoamEnclosure:NEMA4X(iP65)Power:12to14VDC,14mAaverageat12.5VDCTypicalBatteryLife(printersetat1in/hr,1minutelevelreadinginterval,5minutevelocityreadinginterval)934Nickel-CadmiumBattery:8to11days946Lead-AcidBattery:12to16days948Lead-AcidBattery:2 to3monthsProgramMemory:Non-volatile,programmableflash.Updateablewithoutopeningenclosure.Display:BacklitLCD,2-line,80-character(5.5mmhighx3.2mmwide)Level-to-AreaConversionsChannelshapes:Round,U-shaped,rectangular,trapezoidalDatapoints:Foursetsof50level-areapointsLevel-to-FlowRateConversionsWeirs:V-notch,rectangular,CipollettiFlumes:Parshall,Palmer-Bowlus,Leopold-Lagco,Trapezoidal,H,HS,HLManningFormula:Round,U-channel,rectangular,trapezoidalDataPoints:Foursetsof50level-flowratepointsEquation:Two-termpolynomialTotalizersLCD:Total,forward,andreverseflow;9digitseach,floatingdecimalpoint,resettableMechanical(optional):Totalflow,7digits,non-resettableAreaVelocitySensor(Seeseparatespecificationsforlow-profilesensor)Size(LxWxH):6.6x1.6x1.2inches(16.8x4.1x3.0cm)Weight,incl.cable:2.1lbs(0.96kg)forstandardprobewith25footcable;3.9lbs(1.8kg)forextendedrangeprobewith50ftcable.AmbientOperatingTemperatureRange:0 to140 F(-18 to60 C)CompensatedTemperatureRange:32 to140 F(0 to60 C)Materials:Polybutadiene-basedpolyurethane,stainlesssteel;PVCandCPVCcableVelocityMeasurementMethod:DopplerUltrasonic,500kHzVelocityrange:-5to+20ft/s(-1.5to6.1m/s)LevelMeasurementMethod:SubmergedpressuretransducerStandardrangeprobe:measurementrange0.05to10ft(0.015to3.05m);maxlevel20ft(6.1m)Extendedrangeprobe:measurementrange0.05to30ft(0.015to9.14m);maxlevel40ft(12.2m)Standardprobeaccuracy(Non-linearity,repeatability,andhysteresisat25 C(77 F).Maxerrorforindicatedlevelrange.0.033to5.0ft(0.01to1.52m): 0.008ft/ft( 0.008m/m) 5.0ft( 1.52m): 0.012ft/ft( 0.012m/m)Extendedprobeaccuracy(Non-linearity,repeatability,andhysteresisat25 C(77 F).Maxerrorforindicatedlevelrange.0.05to15ft(0.015to4.57m): 0.03ft( 0.009m)0.05to21ft(0.015to6.4m): 0.09ft( 0.027m)0.05to30ft(0.015to9.14m): 0.3ft( 0.09