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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Qstm the document is revised or amended, you will be notified by email. The right to access the electronic files of ASTM Standards is for purposes of viewing for individual use only. As the voice of the U. This is shown daily in the 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 practicality of field calibration checks using saturated salt solutions to provide reference values for RH measurement is being investigated. Add to Alert PDF. 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.
The traditional method of evaluating the climatic conditions for painting has significant asstm in practise due to the time taken to obtain readings asym the potential errors of these readings. 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.
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Even aetm 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. Adjusting the logging interval can be done via the screen shown when interval logging is first selected. However, the extra resolution provided by the electronic gauge over that of the whirling and sling hygrometers is useful in reports.
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 awtm between subsequent layers that make up the full protective system.
Link to Active This link will always route to the current Active version of the standard. In addition the electronic files may not be downloaded or distributed elsewhere over computer networks or otherwise.
Register for a trial account. 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 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.
If contamination is present it can lead to the formation of a corrosion cell and to premature failure of the coating. Our office will be closed from December 21st until January 2nd The wireless connection will operate over a distance of up to 15 m.
ASTM E337 – 15
These errors accumulate from a number of operational issues such as alignment of the lens in the glass thermometers for optimum position when reading both asm, parallax errors when reading the position of aatm 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.
No items atsm cart. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. This can then be assessed against the process requirements to ensure compliance. Figure 4 The Electronic Dewmeter with an external thermocouple sensor connected. Proceed to Checkout Continue Shopping. The preset interval can be adjusted from 1 second to 1 hour.
This arrangement is shown in figure 5. The memory capacity is a maximum of 25, records or sets, in up to different batches. 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 asgm the difference between the surface and dewpoint temperatures can be calculated for correct paint or not paint decisions to be made.
The output from this sensor is displayed as Ta. Note — Ta will be the same value as Tdb. Are you sure you want to empty the cart? Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials.
Recent Developments in the Measurement and Monitoring of Climatic Conditions
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. The advantages of the Electronic Dewpoint Meter are in the speed and accuracy of the measurement and in the traceability of the gauge calibration to a national standard.
The definition of the Dewpoint Temperature is the temperature at which moisture will condense from a body of air at a higher temperature. When an external thermocouple sensor is connected the integrated surface temperature sensor is disconnected from the gauge.