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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ASTM grants you a license as follows: The Dewpoint Temperature is then compared to the temperature of the surface to be aztm determined by another measurement, sometimes using a magnetic bi-metallic strip thermometer. Data can be recorded using two methods, user zstm recording of values as and when required or the data-logging mode, with reading sets recorded automatically at the end of the pre-set interval.

Enter your account email address to request a password reset: The reference values are set using the controls for the chamber and measured independently using calibrated equipment.

The external thermocouple is also attached to the substrate using a magnet to get a good thermal contact for the surface temperature measurement. The PC version of the software also offers features for analyzing data, for reporting and for archiving date for future analysis or comparison. However, the hygrometers described in this method use mercury in glass thermometers, which are no longer acceptable under Restriction of Hazardous Substances RoHS legislation round the world.

The values quoted in table 1 s337 obtained from the calibration software and can be shown to a resolution of two decimal places. The default time is 1 minute. We have no amendments or corrections for this standard. The right to access the electronic files of ASTM Standards aetm for purposes of viewing for individual use only.

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ASTM E337 – 15

The feature in the electronic Dewmeter that displays the calculated wet bulb temperature and the measured dry bulb temperature the air temperature, Ta has good agreement with the wet and dry bulb method in conditions of stable relative humidity.

You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. Content only available by subscription. This arrangement is shown in figure 5. Calibration of the Electronic Dewpoint Meter is carried out in a temperature controlled 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 addition the electronic files may not be downloaded or distributed elsewhere over computer networks or otherwise.

An example of this type of gauges is shown in figure 3.

Data stored in the memory of the Dewpoint Meter can be transferred to a computer operating data astj software. If the document is revised or amended, you will be notified by email. 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.

Already Subscribed to this document. 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.

As the voice of the U. Are you sure you want to empty the cart? The aspirated psychrometer e3337 more accurate than the sling whirling psychrometer see Method Band it offers advantages in regard to the space which it requires, the possibility of using aztm types of thermometers for example, electricaleasier shielding of thermometer bulbs from extraneous radiation, accidental breakage, and convenience.

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Link to Active This link will always route to the current Active version of the standard. Similarly the data-logging option can be chosen when a new batch is selected by pressing the clock softkey.

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. This standard is not included in any packages. We wish you and yours a Happy Holiday Season! Search book title Enter keywords for book title search. You may delete a document from your Alert Profile at any time.

Recent Developments in the Measurement and Monitoring of Climatic Conditions

The preset interval can be adjusted from 1 second to 1 hour. The output from this sensor is displayed as Ta. The method specified is based on measuring air temperature and relative humidity, calculating the dewpoint temperature, measuring the steel surface atm, and estimating the minimum surface temperature above the dewpoint temperature that is needed to avoid condensation under the prevailing environmental conditions.

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