Dew Point Transmitter and Sensor Manufacturer

A high dew point means that the air can hold a lot of moisture before it becomes saturated and condensation occurs. In general, a dew point above 60°F (15°C) is considered high. High dew points can make the air feel humid and uncomfortable, especially on a hot day.

Actually there are two main types of dew point transmitters, each one with a different working principle, please check as following: 

1. Chilled Mirror Dew Point Transmitters:

• This type measures dew point by directly mimicking the definition of dew point itself – cooling a small mirror surface until water vapor condenses on it.
• Components:
  
  • Mirror: A highly polished metal surface attached to a thermoelectric cooler.
  • Light source: Emits a beam of light onto the mirror.
  • Optical sensor: Detects the amount of light reflected from the mirror.
  • Temperature sensor: Measures the temperature of the mirror.
  • Control unit: Processes signals from the temperature and optical sensors to calculate the dew point.
• Working principle:
  
  1. The control unit starts cooling the mirror.
  2. As the mirror cools, water vapor in the air condenses on its surface, reducing the amount of light reflected to the optical sensor.
  3. The control unit monitors the signal from the optical sensor.
  4. When the reflected light reaches a minimum, the temperature of the mirror is considered the dew point.
  5. The control unit records the dew point temperature and transmits it.

2. Polymer/Ceramic Sensor Dew Point Transmitters:

• This type uses an electro-chemical sensor that changes its electrical properties when exposed to varying humidity levels.
• Components:
  
  • Sensor: Made of a hygroscopic polymer or ceramic material that absorbs water vapor.
  • Electrodes: Integrated with the sensor material to measure its electrical properties.
  • Control unit: Processes the signal from the sensor to calculate the dew point.
• Working principle:
  
  1. Water vapor in the air is absorbed by the hygroscopic material in the sensor.
  2. The absorption changes the electrical properties of the sensor material.
  3. The electrodes measure the change in electrical properties and send a signal to the control unit.
  4. The control unit converts the signal into a dew point temperature based on a pre-calibrated relationship.
  5. The control unit records and transmits the dew point temperature.

Which type is better?

The choice between a chilled mirror and a polymer/ceramic sensor transmitter depends on your specific needs:

• Chilled mirror:
  
  • More accurate and reliable, especially for low dew points.
  • Longer lifespan.
  • Higher cost and maintenance requirements.
• Polymer/ceramic:
  
  • Lower cost and maintenance requirements.
  • Less accurate, especially for low dew points.
  • Shorter lifespan.

I hope this explanation helps! 

Feel free to ask or contact our Team by email if you have any further questions about dew point transmitters.

Dew point and humidity are two different measures of the amount of moisture in the air. 

1.Dew point is the temperature to which the air must be cooled to become saturated with water vapor. In other words, it is the temperature at which the air can no longer hold any more water vapor in the form of gas. If the air is cooled further, the excess water vapor will condense into liquid water, forming dew.

2.Humidity, on the other hand, is the amount of water vapor in the air, expressed as a percentage of the maximum amount of water vapor that the air can hold. Relative humidity is the most common measure of humidity, and it is calculated by dividing the actual amount of water vapor in the air by the maximum amount of water vapor that the air can hold at that temperature.

There are a few different ways to calculate dew point temperature. The most common method is to use a hygrometer, which is a device that measures both temperature and humidity. The dew point temperature can then be calculated from the temperature and humidity readings using a special formula.

Another way to calculate dew point temperature is to use a psychrometer, which is a device that consists of two thermometers, one with a wet bulb and one with a dry bulb. The dew point temperature can then be calculated from the difference between the wet bulb and dry bulb temperatures using a special table or formula.

No, dew point and humidity are not the same thing. Dew point is a measure of the amount of moisture in the air, while humidity is a measure of the ratio of the amount of water vapor in the air to the maximum amount of water vapor that the air can hold.

Two different air masses can have the same dew point but different humidity levels. For example, a warm air mass with a high dew point can have the same humidity level as a cool air mass with a low dew point. This is because the warm air mass can hold more water vapor than the cool air mass.

There is no cod point in Mountain Dew. Cod points are a unit of measurement used to quantify the amount of cod liver oil in a product. Mountain Dew does not contain cod liver oil.

The comfortable dew point range for most people is between 40°F (4°C) and 60°F (15°C). Below 40°F, the air can feel dry and uncomfortable. Above 60°F, the air can feel humid and uncomfortable.

A dew point above 60°F (15°C) is considered humid. Humid air feels sticky and uncomfortable, especially on a hot day.

A dew point above 65°F (18°C) is considered muggy. Muggy air feels even more sticky and uncomfortable than humid air.

Dew point meters, also known as dew point transmitters or sensors, have a variety of purposes in different fields. Here are some of the most common ones:

1. Monitoring atmospheric conditions:

• Weather forecasting: Dew point is a crucial factor in predicting fog, precipitation, and cloud formation. Meteorologists use dew point measurements to understand atmospheric moisture content and stability, aiding in weather prediction and warnings.
• Aviation: Pilots use dew point data to assess the risk of carburetor icing, fog formation, and cloud base heights, ensuring safe flight operations.

2. Controlling humidity levels:

• Building management: Dew point is crucial for managing indoor humidity levels in buildings. Construction and maintenance professionals use dew point meters to prevent condensation buildup that can lead to mold growth, structural damage, and air quality issues.
• 工業プロセス： Industries like food processing, pharmaceuticals, and textiles require precise control of humidity. Dew point measurements ensure optimal product quality and prevent unwanted moisture absorption or dehydration.

3. Protecting equipment and materials:

• Corrosion prevention: In industries like oil and gas, high dew points can lead to corrosion of pipelines and equipment. Dew point monitoring helps control humidity levels and prevent costly damage.
• Paint and coating applications: Optimal dew point conditions are needed for proper paint and coating adhesion. Dew point meters ensure ideal conditions for paint application, preventing peeling and cracking.

4. Research and scientific applications:

• Environmental studies: Dew point measurements are used in environmental research to understand climate change, atmospheric dynamics, and water balance.
• Agricultural applications: Farmers use dew point data to predict potential frost damage and irrigation needs, optimizing crop yields and water management.

Overall, dew point meters are incredibly versatile tools used across various fields to understand and manage humidity levels, ensuring safety, efficiency, and quality in diverse applications.

Testing the humidity in an air cylinder is crucial to ensure the quality and performance of the compressed air it contains. Excessive moisture can lead to corrosion, reduced flow, and malfunctioning of equipment using the air. Here are two common methods for testing humidity in an air cylinder:

1. Chilled Mirror Hygrometer:

• This method uses a cooled mirror surface to condense water vapor from the air sample. The temperature at which condensation occurs is directly related to the dew point, which is a measure of the humidity.
• Procedure:
  
  1. Connect the hygrometer to the air cylinder using an appropriate adapter.
  2. Open the valve on the cylinder to allow air to flow through the hygrometer.
  3. Cool the mirror surface gradually until dew forms on it.
  4. Record the temperature at which dew first appears. This is the dew point temperature.
  5. Use a dew point chart or conversion calculator to determine the relative humidity based on the dew point temperature and the air temperature.

Chilled Mirror Hygrometer

 

2. Hygroscopic Sensor:

• This method uses a sensor material that changes its electrical properties in response to changes in humidity. The change in electrical properties is then measured and converted to a humidity reading.
• Procedure:
  
  1. Connect the hygrometer with the hygroscopic sensor to the air cylinder using an adapter.
  2. Open the valve on the cylinder to allow air to flow through the sensor.
  3. The hygrometer will display the relative humidity directly.

Hygroscopic Sensor

Additional Tips:

• Ensure the hygrometer is properly calibrated before use.
• Take multiple measurements from different locations within the cylinder for a more accurate representation of the overall humidity level.
• Consider the operating conditions of the equipment using the compressed air when interpreting the humidity results.

So Above these methods and tips, you can effectively test the humidity in your air cylinder and ensure the optimal performance of your equipment.

Controlling the dew point in compressed air is crucial for ensuring the quality and performance of your pneumatic equipment. Excessive moisture can lead to corrosion, reduced flow, malfunctioning of equipment, and even contamination of sensitive products. Here are some key methods for controlling dew point in compressed air:

1. Air Dryers:

• Air dryers are the most common and effective method for removing moisture from compressed air. They work by lowering the dew point, the temperature at which water vapor condenses. There are two main types of air dryers:

  • Refrigerant dryers: These dryers use a refrigeration system to cool the compressed air, causing water vapor to condense and drain out. They are suitable for achieving dew points down to around 40°F (4°C).

    

     

• • Desiccant dryers: These dryers use a desiccant material, such as silica gel or alumina, to absorb moisture from the compressed air. They can achieve much lower dew points, down to -40°F (-40°C) or even lower, making them ideal for critical applications

    

2. Aftercoolers:

• Aftercoolers are heat exchangers that cool the compressed air after it exits the compressor. This reduces the amount of water vapor that can remain in the air, effectively raising the dew point. While not as effective as air dryers, aftercoolers can be a good first step in moisture control, especially for applications with moderate dew point requirements.
  
  

   

3. Drain Traps:

• Drain traps automatically remove condensate (water) from the compressed air system. They are essential for all systems, regardless of other dew point control methods. Different types of drain traps are available, such as automatic, float, and timer-based, each with its own advantages and disadvantages.
  
  

   

4. System Design and Maintenance:

• Proper system design and maintenance are essential for effective dew point control. Minimizing pipe lengths, leaks, and dead legs where moisture can accumulate can significantly improve moisture control. Regular maintenance of air dryers, drain traps, and other equipment is also crucial for optimal performance.

Additional Tips:

• Monitor dew point: Use a dew point meter to regularly monitor the dew point at critical points in your compressed air system. This will help you identify any issues and ensure your dew point control measures are effective.
• Choose the right equipment: Select the appropriate air dryer type and capacity based on your specific dew point requirements, air flow rate, and budget.
• Consult with a professional: If you are unsure about the best way to control dew point in your compressed air system, consult with a qualified compressed air professional. They can assess your needs and recommend the most effective and cost-efficient solution.

By implementing these methods and tips, you can effectively control the dew point in your compressed air system and ensure the optimal performance and longevity of your equipment.

Dew point transmitters and sensors play a crucial role in regulating moisture levels across various industries. Here are the top 10 applications where these instruments shine:

1. Compressed Air Systems:

    Ensuring dry and clean compressed air is vital for efficient operation and preventing corrosion in pneumatic equipment. Dew point transmitters monitor dryness levels, optimizing dryer performance and avoiding costly issues.

2. Chemical & Pharmaceutical Processing:

Precise dew point control is critical for product quality and consistency in chemical and pharmaceutical manufacturing. Precisely measuring and managing moisture prevents reactions, ensures accurate formulations, and safeguards product stability.

3. Food & Beverage Production:

Dew point control is crucial for food product quality and shelf life. Monitoring and maintaining optimal moisture levels in storage and processing environments prevents condensation, mold growth, and product spoilage.

4. HVAC & Refrigeration:

Dew point sensors help maintain comfortable humidity levels in buildings and optimize cooling systems. Accurate dew point data allows for proper air conditioning control, maximizing energy efficiency and preventing condensation issues.

5. Environmental Monitoring:

Dew point measurements are integral for weather forecasting, climate studies, and agricultural applications. Monitoring dew point variations helps predict frost, dew formation, and other environmental phenomena.

6. Aviation & Aerospace:

Dew point control is crucial for aircraft safety and performance. Dry air prevents ice formation on critical components, ensuring airworthiness and safe operation.

7. Medical & Biotechnology:

Maintaining precise dew point levels in medical facilities and biotech labs is essential for sterility and preventing the growth of harmful microorganisms.

8. Power Generation:

Controlling moisture in power plants is crucial for efficient energy production and preventing corrosion in turbines and other equipment. Dew point measurement ensures optimal plant operation and minimizes maintenance costs.

9. Construction & Building Materials:

Monitoring dew point during construction helps prevent condensation problems, mold growth, and structural damage. Dew point data informs proper ventilation and drying strategies, ensuring durable and healthy buildings.

10. Automotive & Transportation:

Dew point sensors help optimize paint curing processes in car manufacturing and prevent condensation within sealed vehicle components. This ensures high-quality finishes and protects against corrosion.

Above are just a few examples, and 露点トランスミッタ and sensors have numerous applications beyond these ten.

Their versatility and precision in measuring moisture make them invaluable tools across various industries.

Do you have any specific application in mind where you’d like to know more about dew point transmitters and sensors?