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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Data stored in the memory of the Dewpoint Meter can be transferred to a computer operating data management software.
Print 1 2 3 4 5 page sstarting from page current page. Similarly the data-logging option can be chosen when a new batch is selected by pressing the clock softkey. 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 values quoted in table 1 are obtained from the calibration software and can be shown to a resolution of two decimal places.
Recent Developments in the Measurement and Monitoring of Climatic Conditions
The external thermocouple is also attached to the substrate using a magnet to get a good thermal contact for the surface temperature measurement. Note — Ta will be the same value as Tdb.
The electronic file may not be reproduced in any way. This can then be assessed against the process requirements to ensure compliance. Table 1 shows the typical measured reference values for these parameters that appear on the calibration certificate. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The output from this sensor is displayed as Ta.
The preset interval can be adjusted from 1 second to 1 hour. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. 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. This standard is not included in any packages. If you like to setup a quick demo, let us know at support madcad.
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. This standard is also available to be included in Standards Subscriptions.
ASTM E337 – 15
Caution should be taken when handling mercury and mercury containing products. Historical Version s – view previous versions of standard. The method for determining if moisture is present is given in ISO Enter your account email address to request a password reset: 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.
No other units of measurement are included in this standard. 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.
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 right to access the electronic files of ASTM Standards is for purposes of viewing for individual use only. These errors accumulate from a number of e373 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.
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. The memory capacity is a maximum of 25, records or e373, in up to different batches. Need more than one copy?
Register for a trial account. 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.
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. 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.
If contamination is present it can lead to the formation of a corrosion cell and to premature failure of the coating. No further reproductions authorized.
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Figure 4 The Electronic Dewmeter with an external thermocouple sensor connected. 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 definition of the Dewpoint Temperature is the temperature at which moisture will condense from a body of air at a higher temperature.