Qu’est-ce que le point de rosée et comment le mesurer ? Fabrication industrielle et processus Mesures industrielles Qu’est-ce que le point de rosée ? Le point de rosée est la température à laquelle l’air doit être refroidi pour que la vapeur d’eau qu’il contient condense en rosée ou en givre. Quelle que soit la température, il y a une quantité maximale de vapeur d’eau que l’air peut contenir. Cette quantité maximale est appelée pression de saturation de vapeur d’eau. L’ajout d’eau supplémentaire entraîne de la condensation. Pourquoi l’humidité pose-t-elle problème ? La condensation de l’air comprimé pose problème parce que l’air obstrue les tuyaux, provoque des pannes mécaniques, une contamination et du givre. Quel est l’effet de la pression sur le point de rosée ? La compression de l’air augmente la pression de la vapeur d’eau et donc le point de rosée. Il est important d’en tenir compte si vous évacuez l’air dans l’atmosphère avant d’effectuer une mesure. Le point de rosée au point de mesure sera différent du point de rosée dans le process. Quelle est la plage typique du point de rosée ? La plage de températures du point de rosée dans l’air comprimé va de la température ambiante à -80 °C (-112 °F), et encore plus bas dans certains cas spéciaux. Les systèmes compresseurs sans sécheur tendent à produire un air comprimé saturé à la température ambiante. Dans les systèmes avec sécheurs réfrigérants, l’air comprimé traverse une sorte d’échangeur de chaleur refroidi, ce qui provoque la condensation de l’eau qui est ainsi extraite du flux d’air. Ces sécheurs produisent typiquement un air dont le point de rosée ne descend pas au-dessous de 5 °C (41 °F). Les systèmes de séchage déshydratant absorbent la vapeur d’eau du flux d’air et peuvent produire un air avec un point de rosée à -40 °C (-40 °F) et plus sec au besoin. Comment mesurer avec fiabilité le point de rosée ? Il faut sélectionner un instrument ayant la bonne plage de mesure. Il faut connaître et comprendre les caractéristiques liées à la pression de vue par l’instrument : les instruments de Vaisala conviennent à un usage sous la pression d’un process donné, mais d’autres sur le marché non. Ils peuvent être installés pour la mesure de l’air comprimé après l’expansion de celui-ci à la pression atmosphérique, mais alors la valeur du point de rosée obtenue doit être rectifiée si le point de rosée sous pression est le paramètre de la mesure souhaité. L’installation du capteur doit être correcte. Suivez les instructions du fabricant. Ne posez pas de capteurs de point de rosée à l’extrémité de dérivations ou d’autres tronçons de tuyauterie en cul-de-sac où l’air ne circule pas. Téléchargez le guide électronique de Vaisala sur l’air comprimé ou contactez-nous pour plus d'information..
Transmetteurs de point de rosée miniatures DMT143 & DMT143L (long) Les transmetteurs de point de rosée miniatures DMT143 et DMT143L constituent le choix idéal lorsque vous souhaitez mesurer le point de rosée avec précision dans la fabrication de petits sécheurs à air comprimé, de sécheurs en plastique, de compléments et d'autres applications OEM.
Transmetteur de point de rosée DMT152 Le transmetteur de point de rosée Vaisala DRYCAP® DMT152 est conçu pour mesurer les points de rosée très bas dans les applications OEM, jusqu’à -80 °C.
Indicateur de température et de point de rosée série DMT340 Notez que la série DMT340 est abandonnée. Le transmetteur DMT340 résistant à la condensation est conçu pour les applications industrielles à faible humidité.
Instrument de mesure du point de rosée DMT132 Le DMT132 est un instrument de mesure du point de rosée économique pour la vérification du fonctionnement des sécheurs par réfrigération.
Prasanta Pal sept. 24, 2021 Need the dew point measurement device for drying tower outlet at Sulphuric acid manufacturing process Reply
Juhani Lehto nov. 9, 2021 Hello Pal Thank you for contacting us. Sulphur acid is a harmful chemical (it corrodes the sensor easily) that must be kept away from the dew point transmitter. If the exposure of the Sulphur acid can be minimized, then you can choose the right product depending on the dewpoint measurement range you are looking for. One useful chart to choose the right product can be found here: https://www.vaisala.com/sites/default/files/documents/CEN-G-CompAir-Product-Brochure-B211208EN.pdf. Best regards Juhani, Product Manager Reply
Tony mai 31, 2022 What is the equation and/or conversion tables that takes the electric signal from the capacitor to the values of degrees for dew point? Trying to understand how the variables pressure (absolute and relative), along with temperature, and flow impact the dew point reading. Thank you Reply
Juhani Lehto juin 7, 2022 Hello Tony Thanks for contacting us and showing your interest in dew point measurements. The capacitance signal is measured by converting it first to frequency, where the sensor is a variable capacitance component in the oscillator circuit. This frequency is then counted and converted to relative humidity based on the sensor calibration and linearization (this part is based on the sensor model and other proprietary algorithms that are not public, unfortunately). Please note we always measure relative humidity, and therefore, we need also precise temperature reading that is measured on the humidity sensor surface. This is a normal resistive (pt100) measurement. With a help of this document, you can derive the dew point calculation based on the measured RH and T: https://www.vaisala.com/system/files/documents/Humidity-conversion-formulas-Technical-eBook-B210973EN-L.pdf I hope you will also find answers to other humidity-related calculations like absolute humidity, pressure-dependency, and other humidity formulas under the same document. Best regards Juhani Reply
Vaisala aout 16, 2022 Dear Sunny, More information on RH and calculations you will find here: https://www.vaisala.com/en/lp/make-your-job-easier-humidity-conversion-formulas, or then you can register for our webinar: https://www.vaisala.com/en/events/webinars/lp/real-life-use-cases-humidity-calculations I hope the Humidity Conversion Formulas eBook and our humidity calculator tool will be helpful! Both are free. Reply
Yashwanth kumar aout 15, 2022 At what location, should we measure atmospheric and pressure dew point. Reply
Vaisala aout 25, 2022 Dear Yashwanth Kumar, Thank you for your question. Would you watch our webinar https://www.vaisala.com/en/events/webinars/lp/humidity-measurements-under-pressure to get more information on what pressure is and how it is related to humidity? Reply
vikul nov. 11, 2022 I need to dew point sensor to measure the dew point of compressed air and control the process based on its feedback. Please guide how to choose Reply
Vaisala nov. 25, 2022 Dear Vikul, We have an excellent eGuide that helps in choosing the right instrument for your needs: https://www.vaisala.com/en/lp/download-vaisala-compressed-air-eguide Reply
ASHOK PUJARI févr. 7, 2023 What is the ideal dew point required in an industrial application where the working pressure is between 6-7bar and the equipment's connected are mostly pneumatic cylinders, solenoid valves, pneumatic brakes, etc. Ambient temp ranges from 25-50 degC. And the average relative remains between 60-80% Reply
Juhani Lehto avr. 11, 2023 Dear Ashok Pujari, To find out the dew point in a certain temperature, pressure, and humidity can be solved relatively easy by using e.g. the Vaisala Humidity Calculator: https://www.vaisala.com/en/measurement/humidity-dew-point-and-moisture. With this free tool we can calculate how much the dew point maximum and minimum are. The maximum dew point happens under higher pressure, higher relative humidity and higher temperature. If we put 7 bar, 80 % RH, and 50 degrees Celsius to the Humidity calculator, we can see the calculated dew point temperature is about 45 degrees C. So, if the gas is cooled down to 45 degrees C, the condensation happens. On the other hand, if our conditions are 6 bar pressure, 60 % RH and 25 degrees C, the dew point temperature would be then about 17 degrees C. Based on this information, the dew point temperature is between 17… 45 degrees Celsius depending on the conditions. Reply
Velan mars 7, 2023 We tried to measure the dewpoint for Argon and Nitrogen compressed gases which theoretically are at -186degC and -70 degC using the DMP74B dewpoint analyzer, but we are unable to get the accurate reading of the dewpoint. Wanted a few clarification: a) If the medium tested for dewpoint have a higher range than the analyzer used, will the analyzer give a lower reading instead as it is beyond the accuracy region? b) Can dry gases like argon & nitrogen be used to test dewpoint with the Vaisala DMP74B type analyzers? Reply
Juhani Lehto avr. 11, 2023 Dear Velan, Thank you for your questions. A) If the real frost point (dew point below zero degrees Celsius) is lower (drier) than e.g. the DMP74B, the instrument typically shows the lowest possible reading (with this product the frost point reading goes somewhere to -74 degrees Celsius because the sensor cannot anymore detect the drier condition. B) Argon and nitrogen are both inert gases and can be measured with Vaisala capacitive thin-film sensor technology. Please note that the pressure of the measured gas has an influence on the dew/frost point and should be inputted to the MI70 handheld to compensate for the pressure effect (the DMP74B cannot measure the gas pressure itself but you need to tell it to the instrument if the pressure is not ambient, i.e. 1 bar(absolute)). Reply
Lin avr. 26, 2023 I'm trying to use DMT143, but having trouble reading the result. As far as I know, our ouput is in analog (the value is between 0 to 4095). Is there a conversion chart or formula that will calculate the output into dew point correctly? Reply
Antti Viitanen juin 19, 2023 Dear Lin, Analog output scaling depends on the product you have purchased. Based on the given number you are referring to output figures of analog to digital converter. To get your signal correctly converted you need to first understand what kind of output is selected in DMT143 you are using. If no changes are done to the product it can be done by comparing the configuration code of DMT143 to the order form of DMT143 found at docs.vaisala.com. To be 100% sure the product used can tell it’s scaling through the digital bus. DMT143 scaling could be for example be set such that output is 0 to 5 Volts and range is -70 to +60’C. This means that when the transmitter shows 0 Volts output corresponds to -70’C. If output is 5 volts then it corresponds +60’C dew point. If the transmitter outputs 2.5 Volts then it would correspond -5’C dew point. After you have determined the scaling of DMT143 you need to make sure that how your analog-to-digital converter is scaled and how analog connections are made. For example, if 12 bit AD converter is able to read the whole 0 to 5 Volts output it means that when reading is decimal 0 output of the transmitter is 0 Volts which is the lower range value. If the reading is 4095 it means a maximum of 12 bit converter it means the transmitter outputting 5 Volts which is the maximum range value. If the output is 2047 it means that the transmitter outputs 2.5Volts which is then the middle of the range. Issues could be that for example if an analog connection is scaled for 0 to 5 volts but the transmitter scaling is 0 to 1 volts it means that only one-fifth of AD converter capability is used and when the signal shows 819 it means that the transmitter outputs 5 volts which is maximum range value. Best Regards, Antti Viitanen Product Manager Vaisala Reply
Juhani Lehto mai 25, 2023 Hello Munawer. Thank you for sending your question. It depends on the moisture analyzer if it can output the dew point temperature or not. Most of the Vaisala humidity instruments can also output dew point. We are happy to advise you with all Vaisala related product questions. Reply
Paul juill. 6, 2023 In a compressed air system's pipes are we measuring dew point so that: 1) We keep the compressed air's temperature above the dew point to keep the water vapour in the air or 2) We keep the compressed air's temperature at or below the dew point to allow the water vapour in the air to condense out, and if so where does that water go to? Reply
Vaisala oct. 13, 2023 Dear Paul, I apologize for the late reply, there have been a few comments gone in our Comments, and come up now. 😯 Compressed air should be dried at all times to e.g. prevent corrosion and bacterial growth in the compressed air system, and to cancel free water in the air itself (any water spray or droplets are a sign of bad quality compressed air). There are different drying methods. The most common (low-cost) drying method is a refrigerant dryer that cools the air close to the freezing point. The cool air dew point then directly equals the air temperature because the cold air cannot hold water anymore and all excess water can be removed by draining it out of the system. The cool air is saturated by water meaning the RH is 100 %. After the drying, the air is warmed again, when the relative humidity decreases (hot air can hold more water again). The Vaisala DMT132 is a suitable product for refrigerant driers. With a desiccant drier, it is possible to achieve drier compressed air. Reply
Selvakumar Srinivsaperumal juill. 22, 2023 I am using DMT 143 in my line at a pressure range from 2 to 34 bar, as it is line mounted am getting PDP, but my customer wants ADP irrespective of the line pressure. I know the line pressure reading from PRT, could you help me with the conversion formula? to convert directly to ADP from PRT and PDP readings? Reply
Juhani Lehto oct. 13, 2023 Dear Selvakumar Srinivsaperumal, You can tell the actual process pressure for the DMT143 by using the serial line and XPRES command. The DMT143 can calculate the actual dew point/frost point temperature, converted to atmospheric pressure. Best regard, Juhani Lehto Reply
tarek oct. 1, 2023 hello ,Thanks for the Information I want to know how I can control the dew point in a compressor reviews with dryer integrate Reply
Juhani Lehto oct. 13, 2023 Dear Tarek, Typical solution is that the dryer is controlled by the online dew point measurement. For example, the desiccant dryer regeneration cycle has been traditionally controlled based on time (assumption when the drying agent needs regeneration). A much better way is to switch dryer towers based on the real moisture inside the tower and that can be detected by measuring the outlet of the dryer. As soon as the output gets moisture it is time to switch. This saves energy and money because the tower drying is based on real-time measurement. I recommend reading this article about compressed air drying: https://www.vaisala.com/en/lp/compressed-air-eguide-benefit-industrial-measurements This document also contains a list of suitable dew point transmitter that fits in your dew point range. Best regards, Juhani Lehto Reply
Madeline Blake sept. 14, 2024 This article provides a clear and concise explanation of dew point, its significance, and its impact on compressed air systems. Understanding dew point is crucial for preventing issues like condensation and system failures. Thanks for detailing how to measure it reliably and highlighting the importance of proper equipment and installation! Reply
