Dew Point Sensor Manufacturer

The dew point is the temperature at which the unsaturated air lowers its temperature while keeping the partial pressure of water vapor constant (that is, keeping the absolute water content constant) so that it reaches saturation. When the temperature drops to the dew point, condensed water droplets will be precipitated in the humid air. The dew point of humid air is not only related to temperature, but also related to the amount of moisture in the humid air. The dew point is high with high water content, and the dew point is low with low water content. At a certain humid air temperature, the higher the dew point temperature, the greater the partial pressure of water vapor in the humid air, and the greater the water vapor content in the humid air.

Measuring dew point in industrial settings is critical to ensuring that sensitive equipment does not undergo corrosive damage and the quality of end products is preserved.

Have you ever had a failing dryer in your compressed air system, ruining your production output, but it was not noticed until it was already too late? Dry compressed air is one of the most important quality parameters when it comes to process safety. When ambient air is compressed, the ratio of the humidity to the air volume will rise drastically. Therefore the higher concentration of humidity in the compressed air leads to a higher dew point temperature and the humidity is more likely to condensate at higher temperatures. What can be worse than having water droplets in the compressed air piping, which can lead to machinery breakdown, contaminating your process or even cause blockages?

Using an instrument to measure dew point, a so-called dew point analyzer or dew point meter, will help users to operate a safe and reliable compressed air system, notifying them early in case of alarms.

The so-called "pressure dew point" refers to the dew point temperature value measured in an environment higher than atmospheric pressure, that is, the dew point temperature of the gas under pressure. This is important because changing the gas pressure changes the dew point temperature of the gas.

Under the condition of constant temperature and confined space, the dew point increases with the increase of pressure, and the dew point decreases with the decrease of pressure (up to atmospheric pressure), which is the influence of dew point and pressure.
Since all dew point meter moisture measurements are derived from the measurement of water vapor pressure, the measurement of the total gas pressure of the system will have an impact on the measured humidity.

The importance of dew point temperature to compressed air depends on its use, and in many cases dew point is not a determining factor, such as hand-held compressors in air tools, tire inflation systems in gas stations, etc.). The dew point only becomes important where the pipes carrying the air are exposed to condensing temperatures, at which point a high dew point can cause the pipes to freeze and block. Compressed air is used in many modern factories to operate a variety of equipment, some of which can malfunction if water vapor condensation forms on internal parts. Certain water-sensitive processes (such as painting) that require the use of compressed air may have specific specifications for dryness. There are also medical and pharmaceutical processes that consider water vapor and other gases to be contaminants, requiring very high levels of purity.

Use a dew point meter to measure the air dew point, especially when the water content of the measured air is extremely low, the operation must be very careful and patient. Gas sampling equipment and connecting pipelines must be dry (at least drier than the gas to be measured), the pipeline connections should be completely sealed, the gas flow rate should be selected according to regulations, and a long enough pretreatment time is required. If you are careful, there will be big errors. The practice has proved that when the "moisture analyzer" using phosphorus pentoxide as the electrolyte is used to measure the pressure dew point of the compressed air treated by the cold dryer, the error is very large. This is due to secondary electrolysis generated by the compressed air during the test, making the reading higher than it actually is. Therefore, this type of instrument should not be used when measuring the dew point of compressed air handled by a refrigerated dryer.

Use a dew point meter to measure the pressure dew point of compressed air. The sampling point should be placed in the exhaust pipe of the dryer, and the sample gas should not contain liquid water droplets. There are errors in the dew points measured at other sampling points.

Compressed air can remove water vapor in it by pressurization, cooling, adsorption and other methods, and liquid water can be removed by heating, filtration, mechanical separation and other methods.

The refrigerated dryer is a device that cools down the compressed air to remove the water vapor contained in it and obtain relatively dry compressed air. The rear cooler of the air compressor also uses cooling to remove the water vapor contained in it. Adsorption dryers use the principle of adsorption to remove water vapor contained in compressed air.

The compressed air discharged from the air compressor contains many impurities: ①Water, including water mist, water vapor, condensed water; ②Oil, including oil stains, oil vapor; ③Various solid substances, such as rust mud, metal powder, rubber Fines, tar particles, filter materials, fines of sealing materials, etc., in addition to a variety of harmful chemical odor substances.

The compressed air output from the air compressor contains a lot of harmful impurities, the main impurities are solid particles, moisture, and oil in the air.

Vaporized lubricating oil will form an organic acid to corrode equipment, deteriorate rubber, plastic, and sealing materials, block small holes, cause valves to malfunction, and polluting products.

The saturated moisture in the compressed air will condense into water under certain conditions and accumulate in some parts of the system. These moistures have a rusting effect on components and pipelines, causing moving parts to be stuck or worn, causing pneumatic components to malfunction and air leakage; in cold regions, moisture freezing will cause pipelines to freeze or crack.

Impurities such as dust in the compressed air will wear the relative moving surfaces in the cylinder, air motor and air reversing valve, reducing the service life of the system.

Storage: Easily store large volumes of compressed air as needed.

Simple Design and Control: Acting pneumatic components are of simple design and are therefore suitable for simpler controlled automatic systems.

Choice of motion: Pneumatic components are easy to realize linear and rotary motion with stepless speed regulation.

Compressed air generation system, because the price of pneumatic components is reasonable, the cost of the whole device is low, and the life of pneumatic components is long, so the maintenance cost is low.

Reliability: Pneumatic components have a long working life, so the system has high reliability.

Harsh environment adaptability: Compressed air is not affected by high temperature, dust and corrosion to a large extent, which is beyond the reach of other systems.

Clean environment: The pneumatic components are clean, and there is a special exhaust air treatment method, which has less pollution to the environment.

Safety: It will not cause fire in dangerous places, and if the system is overloaded, the actuator will only stop or slip.