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.
|Genre:||Health and Food|
|Published (Last):||10 May 2017|
|PDF File Size:||14.51 Mb|
|ePub File Size:||10.77 Mb|
|Price:||Free* [*Free Regsitration Required]|
Examples of these measurement devices are shown in figures 1 and 2 below. The digital format of the gauge allows sets aastm reading to be stored in memory for further analysis, reporting or archiving.
Guidance on the estimation of the probability of condensation prior to aatm application. 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. Note — Ta will be the same value as Tdb.
Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. The PC version of the software also offers features for analyzing data, for reporting and for archiving date for future analysis or comparison. The Electronic Dewpoint Meters can be placed in the humidity chamber and the measurements monitored using the wstm output feature to achieve calibration against another relative humidity gauge that is separately calibrated for trace-ability.
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. Digital humidity gauges have been available for some years but there is now a Dewpoint Meter that is axtm specifically to monitor the paint wstm and that also provides a method for recording and presenting data as proof of the conditions prevailing.
Historical Version s – view previous versions of standard.
Recent Developments in the Measurement and Monitoring of Climatic Conditions
Please login to your authorized staff account to use this feature. 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. Your Alert Profile lists the documents that will be monitored. Calibration of the Electronic Dewpoint Meter is carried out in a temperature controlled humidity chamber, whereas the calibration of the wet and dry bulb hygrometers is limited to assessing the accuracy of atsm spirit in glass thermometers.
If you like to setup a quick demo, let us know at support madcad.
Our office will be closed from December 21st until January 2nd The memory capacity is a maximum of 25, records or sets, in up to different batches. In this case, the instrument comprises a wet-bulb thermometer only. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
The default time is 1 minute. Need more than one copy? Similarly the data-logging option can be chosen when a new batch is selected by pressing the clock softkey. 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.
Enter your account email address to request a password reset: No further reproductions authorized. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a ast, server. No other units of measurement are included in this standard. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials.
Please note our new address: Due to the operation of the whirling or sling hygrometer it is not practical to use the humidity chamber method to check the astk of these types of hygrometers psychrometers so the calibration of these rely on the calibration of the thermometers alone.
These errors accumulate from a number of atsm 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.
For more specific safety precautionary statements, see 8. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. By this method, Contractors and Inspectors can ensure that moisture is not condensing on the surface to be coated from the surrounding atmosphere.
No other units of measurement are included in this standard. Figure 4 The Electronic Dewmeter with an external thermocouple sensor connected. Figure 3 — Digital Electronic Dewpoint Meter 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.
ASTM E337 – 15
This is particularly the case when the hygrometer has been stored in office asttm and then is used outdoors in different conditions of ast and humidity. Standards Subsctiption may zstm the perfect solution. 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. When an external thermocouple sensor is connected the integrated surface temperature sensor is disconnected from the gauge.
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. Only the essential features of the psychrometer are specified. Data stored aastm the memory of the Dewpoint Meter can be transferred to a computer operating data management software.
The wireless connection will operate over a distance of up to 15 m.
Already Subscribed to this document. No items in cart. Each set of readings consists of an RH value, the corresponding air temperature, surface temperature and the calculated Dewpoint Temperature and temperature difference, together with the estimated values for wet bulb and dry bulb temperatures.
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. 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. Caution should be taken when handling mercury and mercury containing products.
Please first verify your email before subscribing to alerts.