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Dew point instruments come in different types. They include:
Dew Point Meters
Dew point meter used in real-time monitoring of dew point refers to the temperature at which air becomes saturated with moisture. When this happens, condensation occurs. Every dew point meter has an electronic sensor that detects changes in temperature and humidity. This is done to ascertain dew point. Several meters use a chilled mirror system, which cools the surface of a mirror till condensation occurs. The temperature at which this occurs is the dew point.
Dew Point Calculator
It is common practice to calculate dew point temperature in real time. All that is needed is the room temperature or surface temperature reading to do this. To derive the dew point, relative humidity has to be measured. The calculated dew point will help in understanding at what temperature moisture present in the air will condense on a surface. In situations where condensation is to be avoided, it is very critical to ascertain that the dew point does not reach the surface temperature.
Handheld Dew Point Meters
These are portable meters that are employed to measure dew point in different environments. Such environments include construction and HVAC. Most handheld meters use a capacitive or resistive sensor to measure humidity. A mirror or sensor located at the back of the unit is used to calculate the temperature.
Dew Point Transmitters
Dew point transmitters are instruments used to measure dew point and continuously send data to control systems. Many manufacturing industries with humidification control require dew point transmitters. Dew point transmitters contain sensors that provide accurate measurements and operate over wide ranges.
Digital and Analog Dew Point Meters
These meters convert the dew point data to digital format. They then display the results on LCD screens. Analog dew point meters use the mechanical system to measure and show dew point. Most dew point meters are digital. They feature high accuracy and ease of use.
Understand the dew point allows for the control of processes in industry.
Pharmaceuticals Manufacturing
Application of dew point meters in this industry is based on the necessity to control humidity and moisture content. Indirect moisture content can lead to product spoilage and microbial growth. Dew point meters are used to monitor and control the moisture level in the air. This ensures that drugs and vaccines have the right quality and stability during storage, shipping, and production.
Food and Beverage Industry
Just like in the pharmaceuticals industry, condensation in the food and beverage industry can have negative consequences. Buyers will do anything to avoid the presence of condensation as it will definitely reduce food quality. It can even result in spoilage and the creation of unsafe environments. Dew point meters are used to control humidity during packaging and storage. This helps to increase product quality and safety.
Textiles Industry
High levels of humidity can lead to damage in textile materials. This includes mold and mildew growth as well as fiber damage. Dew point meters are used in this industry to monitor and control humidity. This helps reduce the possibility of such occurrences as moisture-related deterioration.
The Semiconductor Industry
Semi conductors sold in the market today are products of an industry that heavily relies on dew point measurement and control to ensure product quality. High moisture levels can negatively affect the process of wafer fabrication and etching. Dew point meters are employed to monitor and control the moisture levels in cleanrooms. These are highly controlled environments that require strict humidity and dew point control.
Archive and Museum Preservation
This is another industry where dew point meters are utilized to prevent damage to valuable artifacts. These items include paintings, historical documents, and works of art. High humidity levels can lead to condensation. This in turn causes mold growth, deterioration of paper, and damage to wooden artifacts. Use of dew point meters leads to effective monitoring of humidity. It also results in development of implementation of climate control systems that maintain stable environments for preservation.
Dew point measuring devices have several important features. They include:
Display
The dew point temperature meter has a display screen that allows users to confirm the readings displayed by the device. Although analog models come with dials, most contemporary dew point meters feature digital displays. After all, digital technology is more accurate than analog. The display screen measures temperature in Celsius or Fahrenheit, humidity percentage, dew point temperature, and wet bulb temperature.
Temperature Sensor
Temperature sensors within the dew point meter are responsible for the measurement of ambient and dew point temperatures. This is accomplished by relying on thermoelectric cooling elements that offer high accuracy. A prominent temperature sensor technology employed is the thermocouple. The thermocouple sensor consists of two different metals merged into one. The metals produce a voltage corresponding to the temperature once the metal junction is exposed to varying temperatures. Other models use a temperature sensor that provides near instant readings.
Humidity Sensor
Dew point meters utilize humidity sensors that measure moisture levels through two popular techniques. They are the capacitive and resistive methods. The capacitive method measures humidity by ascribing changes in capacitance brought about by variations in the moisture concentration. On the other hand, the resistive method assesses humidity by measuring the changes in electrical resistance occasioned by moisture absorption.
Chilled Mirror Technology
This is one of the most accurate techniques used to measure the dew point. A high degree of accuracy and dependability is offered by this method compared to capacitive sensors exclusively. A mirror surface is first cooled, then the temperature is stabilized at the dew point. When dew appears on the surface of the mirror, the temperature is designated as the dew point. A chilled mirror hygrometer is considered the gold standard for measuring dew point. It is suitable for laboratories and industries needing precise measurements.
Portability
Many dew point meters are designed to be portable for easy carrying and transportation. Most of these cordless meters rely on batteries for power, making it convenient for outdoor or field measurements. Portability eliminates the need for long cables and provides flexibility in taking measurements in various locations.
There are some important considerations buyers should make when purchasing dew point hygrometers. These factors include:
Accuracy and precision
These are the most critical parameters to consider when buying a dew point meter. Those meant for industry and laboratory applications usually feature an accuracy of ±0.5 to ±2 °C for dew point measurement. This makes them suitable for situations where even the slightest discrepancy can have adverse effects. Additionally, the most accurate and reliable dewpoint meters feature chilled mirror technology. All other technologies have a cap of ±3% to ±5% RH as relative humidity accuracy.
Measurement Range
Buyers should first assess before purchasing dew point meters the application needs. The dew point meter should have the appropriate range for the intended applications. Dew point meters used in storage and retrieval usually have wide measurement ranges. Temperature and humidity control in warehouses and storage facilities also use dew point meters with large-ranging measurement. However, labs and industrial processes can get by with a meter having a low measurement range. Meters with large measurement ranges are also equipped with additional features.
Portability and power options
Portability is an essential consideration for those planning to take measurements in different locations. A cordless dew point meter that relies on batteries for power is a more portable option. Some models come with the option of corded use for continuous measurements. Continuous measurements are needed in long experiments and processes. Furthermore, some portable models are lightweight and designed to clip to the user's belt.
Temperature Sensors
Various types of dew point hygrometers in the market come with distinct temperature sensors. Users who need quick responses to temperature changes should go for models with rapid-responding sensors. On the flip side, if accuracy is prioritized, then models with slow-responding sensors will also suffice. This is because slow-responding sensors tend to integrate over a longer period. This ultimately improves the accuracy of stable environments.
User-Friendliness
To help simplify the process of using these devices, buyers should look for those with user-friendly interfaces. The meter should have easy-to-read displays and controls that are simple to navigate. Certain models also have touch displays to allow touch controls.
A1. One of the most common mistakes is failure to properly calibrate the dewpoint meter. Dewpoint meters should be calibrated at least once a year for accuracy. Skipping calibration usually leads to wrong readings. Another common mistake is the failure to protect the meter from extreme conditions. Exposure to high temperatures and humidity usually leads to damage. Buyers should never use a dewpoint meter outside the specified operating range. Also, using the wrong dewpoint meter for the application leads to poor performance. Go for the right dewpoint known for accuracy in that particular application.
A2. Most dewpoint meters are designed to operate in a broad spectrum of conditions. These conditions include high humidity, high temperatures, and even low temperatures. However, exposure to extreme conditions outside the operating specifications usually leads to inaccurate measurements. It can also result in damage to the dewpoint meter. Luckily, there are several models designed to withstand such conditions. Always check the product manual to discover the operating limits of the model.
A3. It is critical to clean the dewpoint meter regularly to ensure it works optimally. Cleaning removes the dust and pollutants that cause the sensor to become sluggish. Even more, frequent cleaning is necessary in environments with high levels of dust and particulates. Avoid using harsh chemicals that could damage the dewpoint meter. Also, store it in a dry place to prevent moisture build-up.
A4. The most effective method to verify the accuracy of these devices is through a process known as comparison. This method simply involves contrasting the readings of the dewpoint meter with those of a more accurate instrument. Most people usually use the chilled mirror hygrometer as the standard instrument for this comparison. To carry out the comparison, perform simultaneous measurements in identical conditions. Once the sets of readings are acquired, calculate the variation and ascertain the accuracy of the instrument.
