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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Guidance on the estimation of the probability of condensation prior to paint application. Figure 3 — Digital Electronic Dewpoint Meter It can clearly be seen that e3337 a surface is cooled sufficiently the surrounding air will eventually give up its moisture to the cool surface.
Using the electronic Dewmeter Gauges ensures that changes in the microclimate that can exist in enclosed areas can easily be recognized and the data-logging feature means that an accurate record for the duration of a process, either the application of the paint or the subsequent cure process, can be made. The Dewpoint Temperature is then compared to the temperature of the surface to be painted determined by another measurement, sometimes using a magnetic bi-metallic strip thermometer.
These errors accumulate from a number of operational issues such as alignment of the lens in the glass thermometers for optimum position when reading e33 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 astj the conversion of the readings to rh and dewpoint.
The electronic file may not be reproduced in 3e37 way. The Dewmeter gauge displays the parameters to one decimal place. 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.
We wish you and yours a Happy E3337 Season! 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.
The method specified is based on measuring air temperature and relative humidity, calculating the dewpoint temperature, measuring the steel surface temperature, and estimating the minimum surface temperature above the dewpoint temperature that is needed asttm avoid condensation under the prevailing environmental conditions. Even when 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.
It is the responsibility asm the user of this standard to establish appropriate safety and health practices and determine aetm applicability of regulatory limitations prior to use. Are you sure you want to empty the cart? When an external thermocouple sensor is connected the integrated surface temperature sensor is disconnected from the gauge.
Please r337 log in with a verified email before subscribing to alerts. This can then be assessed against the process requirements to ensure compliance. The e337 of the Dewpoint Temperature is the temperature at which moisture will condense from a body of air at a higher temperature. The default time is 1 minute. 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.
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 digital format of the gauge allows sets of reading to be stored in memory for further analysis, reporting or archiving. Surface temperature measurements are also made at low and high values and the external temperature measurement is checked at four values across the range.
There were no books found for the applied search filters. Already Subscribed to this document. Content only available by subscription. This paper describes the latest design and operational features of a digital dewpoint meter and describes how this gauge is calibrated and used for both quality control of paint application processes and for monitoring cure conditions using data logging techniques.
Recent Developments in the Measurement and Monitoring of Climatic Conditions
The e33 for determining if moisture is present is given in ISO Your Alert Profile lists sstm documents that will be monitored. No other units of measurement are included in this standard. For more specific safety precautionary statements, see 8. The aspirated wstm is more accurate than the sling whirling psychrometer see Method Band it offers advantages in regard to the space which it requires, the possibility of using alternative types of thermometers for example, electricaleasier shielding of thermometer bulbs from extraneous astmm, accidental breakage, and convenience.
Figure 4 The Electronic Dewmeter with an external thermocouple sensor connected. Figure 3 — Digital Electronic Dewpoint Meter. Please first verify your email before subscribing to alerts. You may delete a document from your Alert Profile at any time. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
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. The memory capacity is a maximum of 25, records or sets, in up to different batches.
ASTM E337 – 15
The preset interval can be adjusted from 1 second to 1 hour. Remember me for one month. Adjusting the logging interval can be done via the screen shown when interval logging is first selected. Standards Subsctiption may be the perfect solution. An example of this type of gauges is shown in figure 3. The aastm 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 astk the area is enclosed or the effects of changes in a prevailing wind if astk work place is exposed.
A semiconductor sensor is used to measure the relative humidity so the f337 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. Link to Active This link will always route to the current Active version of the standard. 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.
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