• A dew point sensor is a device that measures the dew point of compressed air. The dew point is the temperature at which water vapor in the air condenses into liquid water. In compressed air systems, moisture can cause a number of problems, including:
  • Corrosion of pipes and equipment
  • Reduced efficiency of pneumatic tools and machinery
  • Growth of mold and bacteria
  • Contamination of products

By measuring the dew point of compressed air, you can ensure that the air is dry enough to prevent these problems. This can help to save money on maintenance costs, improve product quality, and extend the life of your compressed air system.

There are two main types of dew point sensors for compressed air:

• Chilled mirror dew point sensors: These sensors work by cooling a mirror until water vapor condenses on its surface. The temperature at which condensation occurs is the dew point. Chilled mirror dew point sensors are very accurate, but they can be expensive and require regular maintenance.
• Electrical capacitance dew point sensors: These sensors measure the change in electrical capacitance of a material as it absorbs moisture. Electrical capacitance dew point sensors are less expensive than chilled mirror sensors and are generally easier to maintain. However, they may not be as accurate as chilled mirror sensors, especially at very low dew points.

When choosing a dew point sensor for compressed air, you should consider the following factors:

• The required accuracy: How important is it to have a very precise measurement of the dew point?
• The dew point range: What is the expected range of dew points in your compressed air system?
• The pressure and temperature of the compressed air: Some dew point sensors are not suitable for use with high-pressure or high-temperature compressed air.
• The ease of use and maintenance: How easy is it to install, calibrate, and maintain the sensor?
• The cost: How much are you willing to spend on a dew point sensor?

The frequency of calibration for a dew point sensor will depend on the specific sensor and the application. However, it is generally recommended to calibrate dew point sensors at least once a year. Some sensors may require calibration more frequently, depending on the use and environment.

The ideal location for a dew point sensor will depend on your specific compressed air system. However, some general guidelines include:

• Installing the sensor after the air dryer to monitor the performance of the dryer.
• Installing the sensor at a point where the compressed air is used in a critical application.
• Avoiding locations where the sensor may be exposed to extreme temperatures or contaminants.