ASTM E Standard Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures). Find the most up-to-date version of ASTM E at Engineering ASTM-Epdf – Download as PDF File .pdf), Text File .txt) or read online.

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Enter your personal account email address to request a password reset: However, the hygrometers described in this method use mercury in glass thermometers, which are no longer acceptable ashm Restriction of Hazardous Substances RoHS legislation round the world.

The definition of the Dewpoint Temperature is the temperature at which moisture will condense from a satm of air at a higher temperature. The electronic file may not be reproduced in any way. The values quoted in table 1 are obtained from the calibration software and can be shown to a resolution astk two decimal places.

Content only available by subscription. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. To simulate the practical operation of the Dewmeter, the calibration is carried out at low and high values zstm RH, with low and high values of Ta. These temperatures make allowance for the accuracy of the measurement of relative humidity and surface temperature in the field and also deal with any inertia in the evaporation from a surface as it warms up.

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Recent Developments in the Measurement and Monitoring of Climatic Conditions

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The air temperature is measured using another semiconductor sensor mounted close to the RH sensor to minimize any differences in conditions. Even when an Electronic Dewmeter is taken from a warm office or car to a cold environment, an accurate reading of rh can be obtained in less than 30 seconds.

ASTM grants you a license as follows: The accuracy of the electronic measurements can be shown to be as indicated on the asfm certificate and the speed of e3337 of the electronic gauge can show ee337 effects sstm the presence of humans in the area, particularly if the area is enclosed or the effects of changes in a prevailing wind if the work place is exposed.

Register for a trial account. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials.


The digital format of the gauge allows sets of reading to be stored in memory for further analysis, reporting or archiving. No items in cart. If the document is revised or amended, you will be notified by email. The surface temperature is measured either using an integrated K-type thermocouple sensor mounted next to the RH and Air Temperature sensors or by using an optional external thermocouple sensor connected via a K-Type connector.

The traditional method of evaluating the climatic conditions for painting has significant limitations in practise due to the time taken to obtain readings and the potential errors of these readings.

In some instances, test records for climatic condition monitoring require that the wet and dry bulb temperatures are entered into the record sheet so to make this process easier and zstm the Electronic Dewmeter provides estimates of the relevant wet and dry bulb temperatures based on the measurement of RH and Ta.

Only the essential features of the psychrometer are specified. Astn, or its vapor, has asgm demonstrated to be hazardous to health and corrosive to materials. It is the responsibility of the user of this standard to establish appropriate safety and zstm practices and determine the applicability of regulatory limitations prior to use.

Caution should be taken when handling mercury and mercury containing products. This is also true for whirling and sling hygrometers as when these encounter immovable objects such as pillars the asttm is to break the spirit-in-glass thermometers. Standards Subsctiption may be the perfect solution. There are several operational aspects of the wet and dry bulb hygrometer method for measuring humidity that influence the accuracy of the measurement including insufficient whirling so steady-state conditions are not reached, contamination of the water so optimum evaporation conditions for the wet bulb are not achieved, the use of spirit-in-glass thermometer in place of the environmentally unsound mercury-in-glass thermometers.

In addition the electronic files may not be downloaded or distributed elsewhere over computer networks or otherwise.

This is shown daily in the layer of moisture that collects on a cold windowpane in the presence of boiling water or, more interestingly, on the outside of a glass of cold beer.

The value of the Dewpoint Temperature mainly depends on the Relative Humidity of the air, that is the volume of moisture contained in the air at a given temperature compared to the maximum volume of moisture that this volume of air could contain if it were saturated at that temperature.


The aspirated psychrometer is more accurate than the sling whirling psychrometer see Method Band it offers advantages in regard to the space which it requires, ashm possibility of using alternative types of thermometers astn example, electricaleasier shielding of thermometer bulbs from extraneous radiation, accidental breakage, and convenience. When an external thermocouple sensor is connected the integrated surface temperature sensor is disconnected from the gauge. Guidance on the estimation of the probability of condensation prior to paint application.

For more specific safety precautionary statements, see 8. Already Subscribed to this document.

ASTM E337 – 15

This can then be assessed against the process requirements to ensure compliance. The PC version of the software also offers features for analyzing data, for reporting and for archiving date for future analysis or comparison. Note — Ta will be the same value as Tdb. Data stored in the memory of the Dewpoint Meter can be transferred to a computer operating data management software.

The measurement of climatic conditions prior to applying a coating is vital to the success of the process, as it is well known that a surface at the dewpoint temperature atm have a thin film of moisture over which the paint will be applied. Caution should be taken when handling mercury and mercury containing products.

Data can be recorded using two methods, user activated recording of values as and e37 required or the data-logging mode, with reading sets recorded automatically at the end of the pre-set interval. Figure 3 — Digital Electronic Dewpoint Meter It can clearly be seen that if a surface is cooled sufficiently the surrounding air will eventually give up its moisture to the cool surface. The method specified is e37 on measuring air temperature and relative humidity, calculating the dewpoint temperature, measuring the steel surface temperature, and estimating the minimum surface temperature above the dewpoint temperature that is needed to avoid condensation under the prevailing environmental conditions.

Calibration of the Electronic Dewpoint Meter is carried out in a temperature xstm humidity chamber, whereas the calibration of the wet and dry bulb hygrometers is limited to assessing the accuracy of the spirit in glass thermometers. In the datalogging mode the gauge is attached to the steel substrate by three strong magnets mounted in the back of the gauge case.