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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Please login to your authorized staff account to use this feature. In the datalogging mode the gauge is attached to the steel substrate by three strong magnets mounted in the back of the gauge case.
ASTM E337 – 15
Link to Active This link will always route to the current Active version of the standard. Even when an Electronic Dewmeter is taken s337 a warm office or car to a cold environment, an accurate reading of rh can be obtained in less than 30 seconds.
Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Measurement of relative humidity in controlled conditions is not practical for the whirling or sling hygrometer as the presence of an operator in the controlled environment causes errors.
There were no books found for the applied search filters. The reference values are set using the controls for the chamber and measured independently using calibrated equipment.
Surface temperature measurements are also made at low and high values and the external temperature measurement is checked at four values across the range. These errors e3337 from a number atsm operational issues such as alignment of the lens in the glass thermometers for optimum position when reading both thermometers, parallax errors when reading the position of the thread relative to the scale on the glass, heat from hands transmitted to the bulbs of the thermometers and resolution of the measurement and the conversion of the readings to rh and dewpoint.
This is shown daily in wstm 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 traditional e33 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.
Caution e37 be taken when handling mercury and mercury containing products. This standard is not included in any packages.
Table 1 shows the typical measured reference values for these parameters that appear on the calibration certificate.
Please sign into an account with a subscription to this content, or email for help at support madcad. Note — Ta will be the same value as Tdb. The advantages of the Electronic Dewpoint Meter are in aastm speed and accuracy of the measurement and in the traceability of the gauge calibration to a national standard.
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No other adtm of measurement are included in this standard. No items in cart. Standards Subsctiption may be the perfect solution. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. The values quoted in table 1 are obtained from the calibration software and can be shown to a resolution of two decimal places.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For s337 specific safety precautionary statements, see 8.
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. 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.
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 s337 the surface and dewpoint temperatures can be calculated for correct paint or not paint decisions to be made.
Recent Developments in the Measurement and Monitoring of Climatic Conditions
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.
The method for determining the Relative Humidity and hence the Dewpoint Temperature that has been most commonly taught to Paint Inspectors is the Wet and Dry Bulb method, commonly called the Whirling or Sling Hygrometer.
For more specific safety precautionary statements, see 8. No further reproductions authorized.
Historical Version s – view previous versions of standard. Subscription pricing is determined by: In addition the electronic files may not be downloaded or distributed elsewhere over computer networks or otherwise. Adjusting the logging interval can be done via the screen shown when interval logging is first selected.