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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To asfm 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. 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.
Table 1 shows the typical measured adtm values for these parameters that appear r337 the calibration certificate. The reference values are set using the controls for the chamber and measured independently using calibrated equipment. 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.
The definition of the Dewpoint Temperature is the temperature at which moisture will condense from a body of air at a higher temperature. 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. Data stored in the memory of the Dewpoint Meter can be transferred to a computer operating data management software.
ASTM E337 – 15
Enter your personal account email address to request a password reset: No other units of measurement are included in this standard. Calibration of the Electronic Dewpoint Meter is carried out in a temperature controlled humidity chamber, whereas the calibration of the wet and dry bulb asm is limited to assessing the accuracy of the spirit in glass thermometers.
Only the essential features of e337 psychrometer are specified. We wish you and yours a Happy Holiday Season!
Recent Developments in the Measurement and Monitoring of Climatic Conditions
Enter your account email address to request a password reset: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. 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.
Guidance on the estimation of the probability of condensation prior to paint application. A semiconductor sensor is used to measure the relative humidity so the measurement response time is much quicker than the traditional wet and dry bulb method that can take 20 minutes or more to reach steady-state conditions, at which point the temperatures of the bulbs can be read.
This sensor can be also be used for measuring the temperature of materials to be used in the process or for surface temperature monitoring during the process, data-logging. 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 and the substrate or between subsequent layers that make up the full protective system.
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No further reproductions authorized. Examples of these measurement devices are shown in figures 1 and 2 below. The method for determining if moisture is present is given in ISO 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. Adjusting the logging interval can be done via the screen shown when interval logging is first selected.
The value of the Dewpoint Temperature mainly depends on the Relative Humidity of the air, that is the volume of moisture contained in the air at a given temperature compared to the maximum volume of moisture that this volume of air could contain if it were saturated at that temperature. It must be recognized that Digital Dewmeter do have an uncertainty associated with the measurement and, as electronic gauges, they must be treated with care particularly when they are used on a construction site.
Subscription pricing is determined by: 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.
Are you sure you want to empty the cart? No other units of measurement are included in this standard. The air temperature is measured using another semiconductor sensor mounted close to the RH sensor to minimize any differences in conditions. The estimated values for the wet bulb temperature Twb and the dry bulb temperature Tdb can be displayed by selecting these parameters from the Display menu in preference to two of the usual set, e.
This ee337 is shown in figure 5. Caution should be taken when handling mercury and mercury containing products. The right to access the electronic files of ASTM Standards is for purposes of viewing for individual use only.
Online orders will ship on January 2, This can then be assessed against the process requirements to ensure compliance.