2012年8月24日 星期五

Dewpoint Meters and Their Uses


Dewpoint meters are devices which are specially designed in order to measure the temperature at which dew is formed. At a certain temperature, dew is formed. There is a constant biometric pressure of air which must be cooled in order for the water vapor to condense. This condensed vapor then turns into water and dew is formed. This entire process will take place when the dewpoint is right.

What is the dewpoint?

The dewpoint meters are used for measuring the temperature at which dew forms. Dew forms when a certain saturation point is met. This point is referred to as the dewpoint. However, when this point is below the freezing point, it is known as frost point since the water vapor then doesn't condense to water but it then changes to frost through deposition. The point at where this process would take place is referred to as dewpoint and is required to be measured in industries for several reasons.

What are these Meters Used for?

The dewpoint meters are used in order to determine when this particular point is met. The meter uses its sensors in order to detect the changes in humidity and temperature. dewpoint has been associated with relative humidity. The closer the point is to the current air temperature, higher would be the relative humidity that would be indicated. This device can measure the moisture level in gas or air samples through positive pressure. The accuracy that is provided by some of the newer devices is quite impressive. Many of these can read ppm moisture as well as read the dewpoint temperature in gas or air.

This point usually needs to be measured in field applications for painting situations. In fact, these devices are one of the most critical devices to be used for analysis to confirm conditions are correct before you can paint. Some of these devices are also used in various other situations and are generally referred to as dewcheck device. Dewpoint meters have versatile uses and has impressive features today.

Several of the new meters include integrated magnets which allow remote monitoring of data on steel substrates and have a memory which can store a large number of readings over days weeks or even months. They may even offer data output via Bluetooth and USB to PDAs and PCs. It is also important to ensure that you only invest in one that is waterproof and dustproof and that the sensors are fully sealed so as to ensure that it lasts for a long time. A hand held device would be easier to use, especially if it has an illuminated display. Most dewpoint meters today also record several climatic parameters such as wet bulb and dry bulb parameters, surface temperature as well as relative humidity.




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