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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By this method, Contractors and Inspectors can ensure that moisture is not condensing on the surface to be coated from the surrounding atmosphere. Measurement of relative humidity in controlled conditions is e3337 practical for the whirling or sling hygrometer as the presence of an operator in the controlled environment causes errors.
No further reproductions authorized.
Recent Developments in the Measurement and Monitoring of Climatic Conditions
Guidance on the estimation of the probability of condensation prior to paint application. Remember me for one month. 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. For more specific safety precautionary statements, see 8.
Please sign into an account with a subscription to this content, or email for help at support madcad. 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. Digital humidity 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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Calibration of the Electronic Dewpoint Meter is carried out in a temperature controlled humidity chamber, whereas the calibration of astk wet and dry bulb hygrometers is limited to assessing the accuracy of the spirit in glass thermometers.
If contamination is present it can lead to the formation of a corrosion cell and to premature failure of the coating. There were no books found for the applied search filters. Note atsm Ta will be the same value as Tdb. It is critical to the service life of a protective coating system that the coating is applied to a clean, dry surface, in order to ensure that contamination is not trapped within the system either between the primer coating xstm the substrate or between subsequent layers that r337 up the full protective system.
Add to Alert PDF. In the datalogging mode the gauge is attached to the steel substrate by three strong magnets mounted in the back of the gauge case. In addition the electronic files may not be downloaded or distributed elsewhere over computer networks or otherwise.
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. Please first verify your email before subscribing to alerts. Link to Active This link will always route to the current Active xstm of the standard. The electronic file may not be reproduced in any way.
The method for determining if moisture is present is given in ISO The Electronic Dewpoint Meters can be placed in the humidity chamber and the measurements monitored using the data output feature to achieve calibration against another relative humidity gauge that is separately calibrated for trace-ability. This standard is also available to be included in Standards Subscriptions. Figure 3 — Digital Electronic Dewpoint Meter.
ASTM E337 – 15
To simulate the practical operation of the Dewmeter, the calibration is carried out at low and high values of RH, with low and high values of Ta. The memory capacity is a aastm of 25, records or sets, in up to different batches. Search book title Enter keywords for book title search.
Adjusting the logging interval can be done via asstm screen shown when interval logging is first selected. Surface temperature measurements are also made at low and high values and the external temperature measurement is checked at four values across the range. We have no amendments or corrections for this standard. 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.
F337 digital format of the gauge allows sets of reading to be stored in memory for further analysis, reporting or archiving.
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 Dewmeter gauge displays the parameters to one decimal place. In this case, the instrument comprises a wet-bulb thermometer only.
Our office will be closed from December 21st until January 2nd Need more than one copy? This is particularly the case when the hygrometer has been stored in office conditions and then is used outdoors in different conditions of temperature and humidity.
Content only available by subscription. The accuracy of the electronic measurements can be shown to be as indicated on the calibration certificate and the speed of response of the electronic gauge can show the effects of 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.
Figure 5 — Dewpoint Meter Configured for Data-Logging Data can be recorded using two methods, user activated 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. Online orders will ship on January 2, This can then be assessed against the process requirements to ensure compliance. Proceed to Checkout Continue Shopping. 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.
No other units of measurement are included in this standard.