Was ist der Taupunkt und wie kann er gemessen werden?

Der Zusammenhang zwischen Taupunkt und Druck
Industrielle Fertigung und Prozesse
Industrielle Messungen

Was ist der Taupunkt?
Taupunkt ist die Temperatur, auf die Luft abgekühlt werden muss, damit Wasserdampf in Tau oder Frost kondensiert. Bei jeder Temperatur gibt es eine maximale Menge Wasserdampf, welche die Luft aufnehmen kann. Diese maximale Menge wird als Wasserdampfsättigungsdruck bezeichnet. Die Zugabe von mehr Wasserdampf führt zur Kondensation.

Warum ist Feuchte problematisch?
Kondensation in Druckluft ist problematisch. Sie kann Blockierungen in Leitungen, Maschinenausfälle, Verunreinigungen und Gefrieren verursachen.

Welchen Einfluss hat Druck auf den Taupunkt?
Luftkompression erhöht den Wasserdampfdruck und damit den Taupunkt. Es ist wichtig, dies zu berücksichtigen, wenn Sie die Luft in die Atmosphäre entlüften, bevor Sie eine Messung durchführen. Der Taupunkt am Messpunkt unterscheidet sich vom Taupunkt im Prozess.

Was ist der typische Taupunktbereich?
Taupunkttemperaturen in Druckluft reichen von der Umgebungstemperatur bis hin zu −80 °C in besonderen Fällen. Kompressorsysteme ohne Lufttrocknungsfähigkeit neigen dazu, Druckluft zu erzeugen, die bei Umgebungstemperatur gesättigt ist. Systeme mit Kältetrocknern leiten die Druckluft durch einen gekühlten Wärmetauscher, wodurch Wasser aus dem Luftstrom kondensiert. Diese Systeme erzeugen typischerweise Luft mit einem Taupunkt von nicht weniger als 5 °C. Mit Trockenmittel arbeitende Trocknungssysteme absorbieren Wasserdampf aus dem Luftstrom und können Luft mit einem Taupunkt von −40 °C und bei Bedarf trockener erzeugen.

Wie wird der Taupunkt zuverlässig gemessen?

  1. Wählen Sie ein Messgerät mit dem richtigen Messbereich.
  2. Machen Sie sich mit den Druckeigenschaften des Taupunktmessgeräts vertraut: Im Gegensatz zu anderen Messgeräten auf dem Markt sind Vaisala Messgeräte für den Einsatz unter Prozessdruck geeignet. Sie können zur Messung von Druckluft montiert werden, nachdem diese auf Atmosphärendruck ausgedehnt wurde. Soll jedoch der Drucktaupunkt gemessen werden, muss der gemessene Taupunktwert korrigiert werden.
  3. Installieren Sie den Sensor richtig mithilfe der Anweisungen des Herstellers: Die Taupunktsensoren dürfen nicht am Ende von Stutzen oder sonstigen Rohrenden montiert werden, wo die Luft nicht zirkuliert.

Erfahren Sie mehr über Druckluft oder scrollen Sie nach unten, um die Taupunktmessgeräte von Vaisala zu erkunden.

Comment

nikhil

Dez. 3, 2019
good info

Prasanta Pal

Sept. 24, 2021
Need the dew point measurement device for drying tower outlet at Sulphuric acid manufacturing process

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

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

Juhani Lehto

Juni. 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

sunny

Juli. 31, 2022
What is relationship between Dewpoint and RH factor.

Vaisala

Aug. 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.

Yashwanth kumar

Aug. 15, 2022
At what location, should we measure atmospheric and pressure dew point.

Vaisala

Aug. 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?

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

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

ASHOK PUJARI

Feb. 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%

Juhani Lehto

Apr. 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.

Velan

März. 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?

Juhani Lehto

Apr. 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)).

Lin

Apr. 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?

Antti Viitanen

Juni. 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

Munawer

Mai. 24, 2023
Can moisture analyzer measure dew point?

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.

Paul

Juli. 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?

Vaisala

Okt. 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.

Selvakumar Srinivsaperumal

Juli. 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?

Juhani Lehto

Okt. 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

tarek

Okt. 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

Juhani Lehto

Okt. 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

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