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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Recent Developments in the Measurement and Monitoring of Climatic Conditions
Please first log in with a satm email before subscribing to alerts. ASTM grants you a license as follows: Remember me for one month. The method specified is based 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. The method for determining if moisture is present is given in ISO The external thermocouple is also attached to the substrate using a magnet to get a good thermal contact for the surface temperature measurement.
It is therefore essential that the relative humidity RHthe air temperature Ta and the surface temperature Ts are measured quickly and accurately so that the dewpoint temperature Td and the difference between the surface and dewpoint temperatures can be calculated for correct paint or not paint decisions to be made.
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, the possibility of using alternative types of thermometers for example, electricaleasier shielding of thermometer bulbs from extraneous radiation, accidental breakage, asfm convenience. For more specific safety precautionary statements, see 8.
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Online orders will ship on January 2, The reference values are set using the controls for the chamber and measured independently using calibrated equipment. This standard is also available to be included in Standards Subscriptions.
No further reproductions authorized. 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.
In the datalogging mode the gauge is attached to the steel substrate by three strong magnets mounted in the back of the gauge case. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. Standards Subsctiption may be the perfect solution. The output from this sensor is displayed as Ta. We wish you and yours a E33 Holiday Season!
Print 1 2 3 4 axtm page sstarting from page current page. This is also true for whirling and sling hygrometers as when these encounter immovable objects such as pillars the tendency is to break the spirit-in-glass thermometers. The Dewpoint Temperature is then compared to the temperature of the surface to be painted determined by another measurement, sometimes using a magnetic bi-metallic strip thermometer.
Already Subscribed to this document. 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.
Are you sure you want to empty the cart? By this method, Contractors and Inspectors can ensure that moisture is not condensing on the surface to be coated from the surrounding atmosphere. 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 will have a thin film of moisture over which the paint will be applied.
This paper describes the latest design and operational features of a digital dewpoint meter and describes how this gauge is calibrated and used for both quality control of paint application processes and for monitoring cure conditions using data logging techniques.
The PC version of the software also offers features for analyzing data, for reporting and for archiving date for future analysis or aastm.
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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Caution should be taken when handling mercury and mercury e3337 products. Please first verify your email before subscribing to alerts.
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ASTM E337 – 15
You currently cannot aztm this content. Register for a trial account. Digital asym gauges have been available for some years but there is now a Dewpoint Meter that is designed specifically to monitor the paint process and that also provides a method for recording and presenting data as proof of the conditions prevailing.
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