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Dew Point/ TECHNOLOGY DESCRIPTIONVaisala DRYCAP Sensor for MeasuringDew PointIn 1997 Vaisala introduced DRYCAP , a new type of dew point sensor based on thin-film polymertechnology. Since its launch, the DRYCAP product family has grown to encompass a huge rangeof applications, from drying processes to compressed air and dry chambers. The DRYCAP sensoris particularly renowned for its reliable performance in hot and very dry environments.How It WorksDRYCAP’s unrivalled performance isbased on two innovations: the provencapacitive thin-film polymer sensorand the auto-calibration function.The sensor’s thin-film polymerabsorbs or releases water vapor asthe surrounding humidity increasesor decreases. The dielectricproperties of the polymer changeas the humidity around the sensorchanges, as does the capacitance ofthe sensor. Capacitance is convertedinto a humidity reading. Thecapacitive polymer sensor is bondedtogether with a temperature sensor,and dew point is calculated from thehumidity and temperature readings.Vaisala’s patented auto-calibrationfunction optimizes the measurementstability at low dew points.The sensor is heated at regularintervals during the automatedauto-calibration procedure. Thehumidity and temperature readings82are monitored as the sensor coolsto ambient temperature, with offsetcorrection compensating for anypotential drift. This enables theDRYCAP sensor to deliver accuratemeasurements in the long term,dramatically reducing the need formaintenance.Typical Applications forDew Point MeasurementVaisala DRYCAP dew pointinstruments measure dew point inindustrial applications, where gashumidity is typically very low. Dewpoint is often a critical parameter,with inadequate control resulting inproblems such as process downtime,damaged process equipment, anddeterioration in end-product quality.Dew point is measured in variousdrying and heat-treatment processes.It is also controlled in compressedair, where excess moisture can resultin poor end-product quality, iceformation, and equipment corrosion.DRYCAP in Brief Thin-film polymer sensor withunique auto-calibration function Wide measurement range, dewpoint measurement down to-80 C (-112 F) Accuracy 2 C ( 3.6 F)NIST-traceable dew pointmeasurementDRYCAP’s Unique Benefits Excellent long-term stability,with recommended 2-yearcalibration interval Rapid response time Resistant to particulatecontamination, oil vapor, andmost chemicalsWithstands condensation andrecovers rapidly
Other typical applications includemedical gas, dry environments inlithium battery manufacturing, andgas-insulated high-voltage equipmentused in the power industry.Upper electrodeVaisala DRYCAP DewPoint ProductsThin-film polymerDew PointLower electrodeVaisala's dew point instrumentsare suitable for accurate and stablemonitoring of dry conditions in avariety of applications from -80 to 100 C Td. Vaisala’s product rangeincludes transmitters for demandingindustrial applications, compactinstruments for installation in dryers,and hand-held meters for spotchecking. Portable sampling systemsare also available. View the completerange of dew point products atwww.vaisala.com/dewpoint.Glass substratePt-100Structure of the DRYCAP sensor.DRYCAP sensor.The DRYCAP StoryThe DRYCAP story beganin the mid-1990s followingan unresolved measurementchallenge. Traditional humidityinstruments were not accurateenough at very low humidities,while commonly used aluminumoxide sensors were prone to driftand required frequent calibration.There was strong demand foraccurate, easy-to-use, costeffective, and low-maintenancedew point instruments.Vaisala's solution was to combinethe highest quality polymertechnology with a patented keyfeature – auto-calibration – thatwould eliminate sensor drift invery dry conditions. The resultwas the stable, reliable, andaccurate DRYCAP sensor.DRYCAP also led the way for thenext great innovation: the world’sfirst transmitter that monitorsboth dew point and processpressure simultaneously, aimedat compressed air customersworldwide. The story continues.The first DRYCAP products werelaunched in 1997, and this highlysuccessful innovation is still goingstrong today.For more information, visitwww.vaisala.com or contactus at sales@vaisala.comRef. B210981EN-B Vaisala 2012This material is subject to copyright protection, with all copyrightsretained by Vaisala and its individual partners. All rights reserved.Any logos and/or product names are trademarks of Vaisala orits individual partners. The reproduction, transfer, distribution orstorage of information contained in this brochure in any formwithout the prior written consent of Vaisala is strictly prohibited.All specifications — technical included — are subject to changewithout notice.83
www.vaisala.comDMT340 Series Dewpoint and TemperatureTransmitters for Very Dry ConditionsThe display shows measurementtrends, real-time data, andmeasurement history.Features/Benefits Measures dew point from-60 C to 80 C (-76 . 176 F) with an accuracy of 2 C ( 3.6 F) Vaisala DRYCAP sensorprovides accurate, reliablemeasurement with excellentlong-term stability and a fastresponse time Condensation-resistant NIST traceable calibration(certificate included) Graphical display and keypadfor convenient operation Optional alarm relays andmains power supply module Analog outputs, RS232/485,WLAN/LAN MODBUS protocol support(RTU/TCP)84Unique auto-calibration featureCompatible with VaisalaDRYCAP Hand-Held DewpointMeter DM70The Vaisala DRYCAP Dewpoint andTemperature Transmitter SeriesDMT340 is designed for industriallow-humidity applications such ascompressed air drying and metaltreatment. The transmitters are veryreliable, easy to use, and economicalto maintain.Stability at Low DewPointsThe Vaisala DRYCAP sensor isimmune to particulate contamination,water condensation, oil vapor, andmost chemicals. Since the sensoris condensation-resistant, itsperformance is unmatched in lowdew point applications where waterspikes occur in the process. Thesensor recovers rapidly from contactwith free water.Unique Auto-CalibrationFeatureThe stability of the DMT340 seriesis due to its unique auto-calibrationfunction, developed by Vaisala. Thisfeature allows the transmitter toperform calibration and adjustmentby itself while the measured processis running. If the measurementaccuracy is not confirmed, correctionsare made automatically. Theprocedure is so quick and correctionsso minor that it causes no disruption,ensuring easy maintenance andhigh performance. To maintain highperformance, transmitters can be sentto Vaisala for calibration. Calibrationintervals depend on the application; innormal conditions it is recommendedto have calibration performed everytwo years.Graphical Display ofMeasurement Data andTrends for ConvenientOperationThe DMT340 features a largenumerical and graphical display witha multilingual menu and keypad.It allows users to easily monitoroperational data, measurementtrends, and access measurementhistory for the past 12 months.The optional data logger, withreal-time clock, makes it possibleto generate over four years ofmeasurement history and zoom in onany desired time or time frame.
Easy InstallationDew PointDMT340 transmitters are deliveredinstallation-ready, with a variety ofinstallation options to choose from.DimensionsProbe SpecificationsDimensions in mm (inches)DMT342 with Small SizeFlanged Probe92.5 (3.64)41(1.61)0 . 50 bar/0 . 725 psiaup to 250 bar/3625 psiaProbe diameter71.5 (2.81)12 mm/0.5"58.7 (2.31)36 mm/1.4"Sampling cellHMP302SC45 45 M671 (2.80)DimensionsProbe SpecificationsDimensions in mm (inches)up to 100 bar/1450 psia12 mm/0.5"Ø 12 (0.47)0 . 50 bar/0 . 725 psiaM22x1.5 orNPT 1/2"DMT344 with Probe forHigh PressuresMechanical durability1/8"-27 NPTø24.5ø32 (1.26)The DMT344 features a threadedconnection for extended pressureswith different fitting-body options. It isideal for permanent installation intopressurized or vacuum processes.7 (0.28)81 (3.19)Sampling cell HMP302SCFlangeProbe diameter9(0.35)ø36 (1.42)InstallationPressure rangeM6Mechanical durabilityø12 (0.47)Flange intersection45 Pressure rangeThe DMT342 probe is installed usinga flange or sampling cell. The smallprobe is ideal for integration into largerequipment.The Vaisala DRYCAP Hand-HeldDewpoint Meter DM70 is ideal for fieldchecking DMT340 transmitters.ø12.5 (0.49)DMT340 is also capable of applyingthe MODBUS communication protocoland, together with an appropriateconnection option, provides eitherMODBUS RTU (RS485) or MODBUS.63)For serial interface the USBconnection, RS232, and RS485 canbe used.(0The DMT340 can support up to threeanalog outputs; an isolated galvanicpower supply and relay outputs arealso available.The data logger, with real-time clockand battery backup, guaranteesreliable logging of measurement datafor over four years. The recordeddata can be viewed on the localdisplay or transferred to a PC withMicrosoft Windows software. Thetransmitter can also be connected toa network with an optional (W)LANinterface, which enables a (wireless)Ethernet connection. A USB servicecable makes it easy to connect theDMT340 to a PC via the service port.16Versatile Outputs andData CollectionTCP/IP (Ethernet) communication.1/8"-27 NPTThe display alarm allows tracking ofany measured parameter, with freelyconfigurable low and high limits.41 (1.61)120 (4.72)170 (6.69)InstallationFitting bodyM22 x 1.5Fitting bodyNPT 1/2"85
DimensionsDMT347 with Small-Sized ProbeMechanical durability12 mm/0.5"InstallationFitting bodyR 3/8" ISOFitting bodyG 1/2" ISOFitting bodyNPT 1/2"Dimensions in mm (inches)DMT348 with Probe forPipeline InstallationsPressure rangeAdjustablelength41 . 149/371 mm/1.61 . 5.87/14.6"41 (1.61)BALLVALVE-1Sampling cellDMT242SC orDMT242SC2R1/2” ISO7/1NPT 1/2"Ball-valve setØ 13.5 (0.53)R1/2" ISO191 (7.52) / 410 (16.1)41 (1.61) - 149 (5.87) / 41 (1.61) - 379 (14.9)Ø 12 (0.47)Fitting body215.5 (8.48) / 448 (17.6)0 . 40 bar/0 . 580 psiaInstallationFitting bodyHex 22 mm(0.87)DimensionsProbe SpecificationsThe DMT348 is ideal for installationinto pressurized processes where theprobe needs to be able to be removedwhile the process is running. The probedepth is adjustable.41 (1.61)up to 10 bar/145 psiaProbe diameterThe DMT347 probe is ideal for tightspaces with a thread connection.The small probe is installed usingSwagelok connectors.84 (3.31)0 . 10 bar/0 . 145 psiaØ 12 (0.47)Pressure rangeDimensions in mm (inches)I S O 3 / 8 ” / N P T 1 / 2 ” or G 1 / 2 ” ISOProbe Specifications35 (1.37)Optional filter for low pressures(suitable for all models)86
Technical DataInputs and OutputsDew pointSensorMeasurement rangeFor continuous useAccuracyup to 20 bar/290 psiaDew point temperature ( C)20 . 50 bar/290 . 725 psiaVaisala DRYCAP 180M-60 . 80 C (-76 . 176 F) Td-60 . 45 C (-76 . 113 F) Td 2 C/ 3.6 F(see the accuracy graph below)additional inaccuracy 1 C TdArea not recommended forcontinuous measurementDew point measurement renge lower limitTemperature of measured gas ( C)Dew point accuracy vs. measurement conditionsResponse time63% [90%] at 20 C gas temperatureFlow rate1 l/min and 1 bar pressure-60 . -20 C Td (-76 . -4 F Td)5 s [10 s]-20 . -60 C Td (-4 . -76 F Td)45 s [10 min]TemperatureMeasurement rangeAccuracyTemperature sensor0 . 80 C ( 32 . 176 F) 0.2 C at room temperaturePt100 RTD Class F0.1 IEC 60751Relative humidityMeasurement rangeAccuracy (RH 10 %RH, at 20 C)0 . 70 %RH 0.004 %RH 20% of readingppmMeasurement range (typical)10 . 2500 ppmAccuracy (at 20 C, 1 bar)1 ppm 20% of readingOther measurement parameters available (model-dependent):mixing ratio, absolute humidity, pressure dew point calculatedto 1 bar, temperature difference (T-Td), water vapor pressureOperating EnvironmentOperating temperaturefor probesMechanical durabilityof transmitter bodywith displayStorage temperature rangePressure range for probesSample flow rateMeasured gasesElectromagnetic compatibility-40 . 80 C (-40 . 176 F)up to 180 C ( 356 F)-40 . 60 C (-40 . 140 F)0 . 60 C ( 32 . 140 F)-55 . 80 C (-67 . 176 F)see probe specificationsno effectnon-corrosive gasesComplies with EMC standardEN61326-1, Industrial environmentNote: Transmitter with display test impedance of40 ohm is used in IEC61000-4-5 (Surge immunity)Operating voltage10 . 35 VDC, 24 VAC 20 %with optional power supply module100 . 240 VAC 50/60 HzPower consumption @ 20 C (Uin 24VDC)RS232max. 25 mAmax. 25 mAUout 2 x 0.1V / 0.5V / 0.10Vmax. 60 mAIout 2 x 0.20 mAdisplay and backlight 20 mAduring sensor purgemax. 110 mAAnalog outputs (2 standard, 3rd optional)current output0 . 20 mA, 4 . 20 mAvoltage output0 . 1 V, 0 . 5 V, 0 . 10 VAccuracy of analog outputs at 20 C0.05% full scaleTemperature dependence of theanalog outputs 0.005%/ C full scaleExternal loadscurrent outputsRL 500 ohm0 . 1V outputRL 2 kohm0 . 5V and 0 . 10V outputsRL 10 kohmMax. wire size0.5 mm2 (AWG 20) stranded wires recommendedDigital outputsRS232, RS485 (optional)Service connectionRS232, USBRelay outputs0.5 A, 250 VAC, SPDT (optional)Ethernet interface (optional)Supported LAN interface (optional)Supported standards802.11bAntenna connector typeRP-SMAProtocolsTelnetSecurityWEP 64/128, WPAAuthentication / EncryptionOpen / no encryptionOpen / WEPWPA Pre-shared key / TKIPWPA Pre-shared key / CCMP (a.k.a. WPA2)Optional data logger with real-time clockLogged parametersmax. three with trend/min./max. valuesLogging interval10 sec. (fixed)Max. logging period4 years, 5 monthsLogged points13.7 million points per parameterBattery lifetimemin. 5 yearsDisplayLCD with backlight, graphical trenddisplay of any parameterMenu languagesEnglish, Chinese, Finnish, French, German,Japanese, Russian, Spanish, Swedish87Dew PointMeasured Parameters
DimensionsCable bushing M20x1.5 for cable diameter 8 . 11mm/0.31 . 0.43"Conduit fitting1/2" NPTUser cable connector (optional)M12 series 8-pin (male)option 1female plug with 5 m (16.4 ft.) black cableoption 2female plug with screw terminalsUSB-RJ45 Serial Connection Cable219685Probe cable diameter5.5 mmStandard probe cable lengths2 m, 5 m or 10 m(Additional cable lengths available,please see order forms for details)Housing materialG-AlSi 10 Mg (DIN 1725)Housing classificationIP 66IP65 (NEMA4X) with local displayWeightdepending on selected probe, cable and modules 1.0 – 3.0 kgsDimensions in mm (inches)77 (3.03)71 (2.80)77 (3.03)71 (2.80)Mechanics183 (7.20)169 (6.65)183 (7.20)7 (0.28)Ø7 (0.28)Ø96 (3.78)116 (4.57)96 (3.78)116 (4.57)169 (6.65)DRYCAP is a registered trademark of Vaisala.TYPE APPROVED PRODUCTCERTIFICATE NO.: A-13529Please contact us atwww.vaisala.com/requestinfowww.vaisala.com88Ref. B210952EN-D Vaisala 2013Scan the code formore informationThis material is subject to copyright protection, with allcopyrights retained by Vaisala and its individual partners. Allrights reserved. Any logos and/or product names are trademarksof Vaisala or its individual partners. The reproduction, transfer,distribution or storage of information contained in this brochurein any form without the prior written consent of Vaisala is strictlyprohibited. All specifications — technical included — are subjectto change without notice.
You Compress Air.We Make Sure It’s Dry.Optimize your compressed air qualitywith the right dew point instrumentFastest wet-to-dry responsetime on the market - just minutesProduct range from -80 C to 60 C Td with 2 C accuracyLong, 2-yearcalibration intervalHigh resistance to contamination– immune to compressor oilComplete recovery fromsaturated conditions For more information, please /compressedairsales@vaisala.com89
www.vaisala.comDMT345 and DMT346 Dewpoint Transmittersfor High Temperature ApplicationsThe large graphical display allows theuser to check data at a glance.Vaisala DRYCAP Dewpoint Transmitters DMT345 and DMT346 are designedto measure and control humidity, especially in dry environments with hightemperatures.The Vaisala DRYCAP DewpointTransmitters DMT345 andDMT346 are designed for humiditymeasurement in industrial dryingapplications with particularly hightemperatures.Both transmitters incorporate theVaisala DRYCAP sensor, which isaccurate, reliable, and stable. Thesensor is condensation-resistantand is immune to particulatecontamination, oil vapor, and mostchemicals. The DRYCAP sensor isnotable for its swift response timeand rapid recovery after getting wet.Measure Humidity Directlyin Hot ProcessesThe DMT345 and DMT346 arebuilt for direct measurement inhot processes. Therefore, thereis no need for sampling systemsand trace heating. As a result,high measurement accuracy andconstancy are maintained.90The accuracy and stability of theDMT345 and the DMT346 are due totheir unique auto-calibration function,developed by Vaisala. This featureallows the transmitter to performcalibration and adjustment by itselfwhile the measured process isrunning. If the measurement accuracyis not confirmed, corrections aremade automatically. The procedureis so quick and corrections sominor that it causes no disruption,ensuring easy maintenance and highperformance. In normal conditions, itis recommended to have a traceablecalibration performed once a year.DMT345: Accurate in Hotand Dry EnvironmentsThe DMT345 is designed for accuratehumidity measurement in hot anddry conditions. This model providesunmatched dry-end measurementaccuracy at temperatures up to 140 C;however, it can operate safely attemperatures up to 180 C.Features/Benefits The DMT345 measureshumidity at temperatures up to180 C (356 F) The DMT346 measureshumidity at temperatures up to350 C ( 662 F) Dew point accuracy 2 C( 3.6 F) Vaisala DRYCAP sensorprovides accurate and reliablemeasurement with excellentlong-term stability and fastresponse time Condensation-resistant Graphical display and keypadfor convenient operation Optional alarm relays andmains power supply module Analog outputs, RS232/485,WLAN/LAN MODBUS protocol support(RTU/TCP)Unique auto-calibration featureNIST traceable calibration(certificate included)
DMT346: Reliable in Very Hot ProcessesThe DMT346 provides the best measurement performanceat process temperatures between 140 C and 350 C.The DMT346 includes a cooling set as standard. Thecooling effect can be regulated by adding the coolingfins, or they can be removed from the set for optimalmeasurement performance.The cooling system has no moving parts, and requires noadditional power or cooling utilities, so there is no risk ofsensor damage due to mechanical cooling failure.Additionally, sensor warming minimizes the risk ofcondensation accumulating on the sensor. In low humidityconditions the combination of auto-calibration andDRYCAP ensures accurate measurement.Graphical Display of Measurement Dataand Trends for Convenient OperationThe DMT345 and DMT346 transmitters feature a largenumerical and graphical display with a multilingual menuand keypad. It allows users to easily monitor operationaldata, measurement trends, and access measurementhistory for the past 12 months.The optional data logger, with real-time clock, makesit possible to generate over four years of measurementhistory and zoom in on any desired time or time frame.The display alarm allows tracking of any measuredparameter, with freely configurable low and high limits.Versatile Outputs and Data CollectionDMT345 and DMT346 transmitters can support up to threeanalog outputs; an isolated galvanic power supply andrelay outputs are also available.For serial interface the USB connection, RS232, and RS485can be used.DMT345 and DMT346 are also capable of applyingthe MODBUS communication protocol and, togetherwith an appropriate connection option, provide eitherMODBUS RTU (RS485) or MODBUS TCP/IP (Ethernet)communication.The data logger, with real-time clock and battery backup,guarantees reliable logging of measurement data for overfour years. The recorded data can be viewed on the localdisplay or transferred to a PC with Microsoft Windows software. The transmitter can also be connected to anetwork with an optional (W)LAN interface, which enablesa (wireless) Ethernet connection. A USB service cablemakes it easy to connect the DMT345/346 to a PC via theservice port.Units are delivered installation-ready.Technical DataMeasured Variables DMT345Temperature DMT345Dew point DMT345Dew point temperature ( C)SensorMeasurement rangeAccuracyterWavapsorVaisala DRYCAP 180S-40 . 100 C (-40 . 212 F) Td 2 C ( 3.6 F) TdSee the accuracy graph belowat urant iolineAccuracy 4 C Tdor betterAccuracy 2 C Tdor bettereac t i vutoutpf ie d ,miticepwer linot sge lonyacrarntA cc ure m ee a suint mopD ewDew point accuracyvs. measurementconditionsgas ( C)Temperatureof measuredDew point accuracy vs. measurement conditionsMeasurement rangewith sensor warmingAccuracyTemperature sensor0 . 180 C ( 32 . 356 F)upper range limited by humidity(at 80 %RH warming is switched on and Treading not actual process temperature) 0.4 C at 100 CPt100 RTD Class F0.1 IEC 60751Relative Humidity DMT345Measurement rangewith sensor warmingAccuracybelow 10 %RHabove 10 %RH0 . 100 %RH0 . 80 %RH 10% of reading 1.5 %RH 1.5% of readingMixing Ratio DMT345Measurement range (typical)Accuracy (typical)0 . 1000 g/kg (0 . 7000 gr/lbs) 12% of readingResponse time 63% [90%] flow rate 1 l/min and 1 bar pressurefrom dry to wet5 s [10 s]from wet to dry including auto-calibration45 s [5 min]91Dew PointThe stainless steel probe is especially designed for hightemperatures and has an optional installation flange foreasy adjustment of the probe’s installation depth and,therefore, more precise positioning.
Technical DataMeasured Variables DMT346Dew point DMT346SensorMeasurement rangeAccuracyVaisala DRYCAP 180S-25 . 100 C (-13 . 212 F) Td 2 C ( 3.6 F) TdSee the accuracy graph belowTemperature dependence ofanalog outputsExternal loadscurrent outputs0 . 1V output0 . 5V and 0 . 10V outputsMax. wire size 0.005%/ C full scaleInputs and Outputs, DMT345 and DMT346Mechanics, DMT345 and DMT346Operating voltage10 . 35 VDC, 24 VAC 20%with optional power supply module100 . 240 VAC 50/60 HzDefault start-up timeinitial reading after power-up3sfull operation after sensor purge and autocalibration about 6 minPower consumption @ 20 C (Uin 24 VDC)max. 25 mAUout 2x0 . 1V/0 . 5V/0 . 10Vmax. 60 mAIout 2x0 . 20mARS232max. 25 mAdisplay and backlight 20 mAduring sensor purgemax. 110 mAAnalog outputs(2 standard, 3rd optional)current output0 . 20 mA, 4 . 20 mAvoltage output0 . 1 V, 0 . 5 V, 0 . 10 VAccuracy of analog outputs at 20 C 0.05% full scaleCable bushingDew point temperature ( C)Mechanical durabilityup to 180 C ( 356 F) for DMT345of probesup to 350 C ( 662 F) for DMT346of transmitter body-40 . 60 C (-40 . 140 F)with display0 . 60 C (32 140 F)Storage temperature range-55 . 80 C (-67 176 F)Pressure range for probes slight pressure difference ( 200 mbar)Measured gasesnon-corrosive gasesElectromagnetic compatibilityComplies with EMC standardEN61326-1, Industrial environmentNote: Transmitter with display test impedance of40 ohm is used in IEC61000-4-5 (Surge immunity)RL 500 ohmRL 2 kohmRL 10 kohm0.5 mm2 (AWG 20) strandedwires recommendedDigital outputsRS232, RS485 (optional)ProtocolsASCII commands, MODBUS RTUService connectionRS232, USBRelay outputs 2 2 pcs (optional)0.5 A, 250 VAC, SPDTEthernet interface (optional)Supported standards10BASE-T, 100BASE-TXConnector8P8C (RJ45)IPv4 address assignmentDHCP (automatic), staticProtocolsTelnet, MODBUS TCP/IPWLAN interface (optional)DHCP (automatic), staticSupported standards802.11bAntenna connector typeRP-SMAIPv4 address assignmentDHCP (automatic), staticProtocolsTelnet, MODBUS TCP/IPSecurityWEP 64/128, WPA WPA2/802.11iAuthentication / Encryption (WLAN)Open / no encryptionOpen / WEPWPA Pre-shared key / TKIPWPA Pre-shared key / CCMP (a.k.a. WPA2)Optional data logger with real-time clockLogged parametersmax. four with trend/min/max valuesLogging interval10 sec. (fixed)Max. logging period4 years, 5 monthsLogged points13.7 million points per parameterBattery lifetimemin. 5 yearsDisplayLCD with backlight, graphical trend displayMenu languagesEnglish, Chinese, Finnish, French, German,Japanese, Russian, Spanish, SwedishDew point accuracy vs. measurement conditionsResponse time 63% [90%] flow rate 1 l/min and 1 bar pressurefrom dry to wet5 s [10 s]from wet to dry including auto-calibration45 s [5 min]Mixing Ratio DMT346Measurement range (typical)Accuracy (typical)0 . 1000 g/kg (0 . 7000 gr/lbs) 12% of readingOperating Environment, DMT345 and DMT34692M20x1.5 for cable diameter8 . 11mm/0.31 . 0.43"Conduit fitting (optional)1/2"NPTUser cable connector (optional)M12 series 8-pin (male)option 1female plug with 5 m (16.4 ft.) black cableoption 2female plug with screw terminalsUSB-RJ45 Serial Connection Cable219685Probe cable diameter5.5 mmStandard probe cable lengths2 m, 5 m or 10 m(Additional cable lengths available, pleasesee order forms for details)Housing materialG-AlSi 10 Mg (DIN 1725)Housing classificationIP 66IP65 (NEMA4X) with local displayWeightdepending on selected probe, cable, and modules1.0 – 3.0 kgs
Technical DataDimensionsDimensions in mm (inches)DMT345 probe and mounting flangeDMT345 and DMT346 transmitter housing75 (2.96)Dew Point28 (1.10)75 (2.95)12 (0.47)77 (3.03)71 (2.80)13.5 (0.53)50 (1.97)41 (1.61)27 (1.06)2 (0.08)drilling 16.22 (0.63.0.87)192 (7.56)242 (9.53)183 (7.20)169 (6.65)DMT346 cooling set304 (11.97)164 (6.46)112.5 (4.43)40.6 (1.6)120 (4.72)ø105 (4.13)ø118 (4.65)ø28 (1.1)8 15 (0.59)(0.31)ø89 (3.5)ø20 (0.79)ø7 (0.28)96 (3.78)116 (4.57)27.5(1.08)sinteredfilter(fixed on top ofthe cooling set)cooling element125 (4.92)mountingflangecooling finsDMT346 probeStainlessstainlesssteelsteel gridgridcable5mm or 10 mcable2, 25 m,or 10357 (14.1)334.5 (13.17)ø 11(0.43)ø13.5 (0.53)22.5 (0.89)DRYCAP is a registered trademark of Vaisala.Please contact us atwww.vaisala.com/requestinfowww.vaisala.comRef. B210723EN-F Vaisala 2013Scan the code formore informationThis material is subject to copyright protection, with allcopyrights retained by Vaisala and its individual partners. Allrights reserved. Any logos and/or product names are trademarksof Vaisala or its individual partners. The reproduction, transfer,distribution or storage of information contained in this brochurein any form without the prior written consent of Vaisala is strictlyprohibited. All specifications — technical included — are subjectto change without notice.93
www.vaisala.comDMT242 Dewpoint Transmitter forOEM ApplicationsFeatures/Benefits Due to its wide measurement range and high long-term stability, the DMT242 is anideal choice for low dew point industrial applications such as compressed air dryers,plastic dryers and other OEM applications.Vaisala DRYCAP The Vaisala DRYCAP DewpointTransmitter DMT242 providesreliable and stable measurementsfor industrial dryer applications. It isdesigned for extreme conditions.DMT242 incorporates the VaisalaDRYCAP thin film polymer sensorand auto-calibration software.The standard sensor choice fordry gases and desiccant dryers isDRYCAP 180M and for more humidapplications such as refrigerationdryers, a DRYCAP 180S sensor.Both the sensors are immune toparticulate contamination, watercondensation, oil vapor and mostchemicals. Because the sensorwithstands condensation, itsperformance is unmatched forlow dew point applications thatexperience process water spikes,such as pipeline condensation duringa system failure or start-up.94The auto-calibration software workson-line while the process is running.If the measurement accuracy is notconfirmed, corrections are madeautomatically. The DMT242 adjuststhe measurement, corrects dry-enddrifts and continues to function.Calibration occurs quickly, andwith corrections so minor, it will gounnoticed.Compact, Rugged andIntelligentDue to its compact size, DMT242 isquickly and easily installed in tightspaces.Users can perform a field-check byusing the Vaisala DRYCAP HandHeld Dewpoint Meter DM70. Thetransmitter can be sent to VaisalaService for NIST traceable calibration.The recommended calibrationinterval is every two years. Ideal choice for industrial dryerapplicationsIncorporates advanced VaisalaDRYCAP Sensor and enhancedauto-calibration softwareLong-term stability in lowdew pointsFast response timeTwo sensor options coverdew point measurementrange from -60 60 C(-76 140 F) with anaccuracy of 2 C ( 3.6 F)Withstands condensationNIST traceable (certificateincluded)Compatible with VaisalaDRYCAP Hand-Held DewpointMeter DM70DimensionsDimensions in mm (inches)
Dew Point TemperatureOperating EnvironmentMeasurement range (typical)-60 . 60 C (-76 . 140 F)Analog output scalingsOption A-80 . 20 C (-112 . 68 F) TdOption B-60 . 60 C (-76 . 140 F) TdOption Xfree scaling(when the dew point is below 0 C (32 F),the transmitter outputs frost point) 2 C ( 3.6 F)Accuracy with DRYCAP 180M(see graph below)Temperaturehigher temperature peaksRelative humidityPressureSample flow rate0 . 60 C (32 . 140 F)Short-term OK0 . 100 %RH0 . 20 bara (0 . 290 psia)no effectOutputAnalog outputResolution for analog outputTypical temperature dependenceSerial line for service use4 .20 mA 0.002 mA0.0008 mA/ CRS232GeneralDew point accuracy vs. measurement conditionsDew point temperature ( C)Response time 63 % [90 %] at 20 C gas temperatureFlow rate 1 l/min and 1 bar pressure-60 - -20 C Td (-76 - -4 F Td)5 s [10 s]-20 - -60 C Td (-4 - -76 F Td)45 s [10 min] 2 C ( 3.6 F)Accuracy with DRYCAP 180S(see graph vaporsaturaetion liny 2 CAccuracTder limit
Vaisala dRycAp sensor for measuring dew point DRYCAP in Brief Thin-film polymer sensor with unique auto-calibration function Wide measurement range, dew point measurement down to -80 C (-112 F) Accuracy 2 C ( 3.6 F) NIST-traceable dew point measurement DRYCAP's Unique Benefits Excellent long-term stability,
