Dew point sensors – find manufacturers and suppliers

Dew point sensors measure the dew point, i.e. the temperature at which moisture condenses in a gas, usually air, and turns into water.

These sensors are crucial for monitoring humidity in various applications, preventing condensation and ensuring process stability.

Below you will find the functionality and measurement methods of dew point sensors, their areas of application and the advantages of using them:

How dew point sensors work:

Dew point sensors measure the air temperature and humidity and use this to calculate the dew point. This indicates the temperature at which the moisture in the air would condense. The measurement result can be output either as an analog signal (e.g. 4-20 mA, 0-10 V) or digitally (e.g. RS485, Modbus, Profibus) to an evaluation electronics.

Measuring methods of dew point sensors:

1. Capacitive measurements:
   Measure the change in capacitance resulting from moisture accumulation on a capacitor.
2. Cooling mirror method:
   Determine the dew point by cooling a mirror until condensation is reached.
3. Resistance-based measurements:
   Measure the electrical resistance that changes at different humidity levels.

Areas of application for dew point sensors:

1. Industry and manufacturing:
In compressed air systems, dew point sensors monitor moisture levels to prevent condensation in the lines that could lead to corrosion and damage to equipment.
In chemical or petrochemical processes, the dew point is monitored to prevent condensation or frost formation in pipelines and reactors.
In the pharmaceutical industry, they are used to precisely monitor humidity in production environments to guarantee product quality and ensure contamination-free environments.

2. Air conditioning and ventilation (HVAC):
Building technology: dew point sensors help to control the relative humidity indoors to prevent condensation on walls and windows and thus prevent mold growth.
Air conditioning systems: They monitor humidity to ensure optimal performance of cooling systems and increase energy efficiency.

3. Cold storage and storage rooms:
Dew point sensors prevent condensation in cold rooms, which ensures the quality and shelf life of food.
When storing pharmaceuticals, constant monitoring of the dew point is important to protect moisture-sensitive products.

4. Power generation:
In power plants, the dew point is monitored to prevent condensation in the exhaust gas, which extends the service life of the systems and increases efficiency.

5. Transportation and logistics:
Dew point sensors prevent condensation in freight containers and warehouses, which can lead to rust or spoilage of goods.

6. Automotive industry:
Dew point sensors ensure controlled humidity conditions during the painting process to guarantee perfect surface quality.
In vehicles, they prevent condensation on windows and ensure a pleasant climate.

Advantages of using dew point sensors:

• Condensation prevention: protects equipment and materials from moisture damage.
• Process reliability: Ensures the stability of industrial processes through precise humidity control.
• Energy saving: Optimization of air conditioning systems and drying processes through precise control of the dew point.
• Product quality: Protects moisture-sensitive products such as food, medicines and electronics from damage caused by excessive humidity.

Dew point sensors are crucial in areas where humidity must be monitored and condensation prevented. Their precise measurement of the dew point ensures process stability in industry, improves energy efficiency in HVAC systems and protects materials and products in storage and production.

Here are the most important aspects to look out for when purchasing dew point sensors:

When purchasing a dew point sensor, various aspects should be considered to ensure that the sensor is suitable for the intended application.

• The sensor should be able to measure the dew point in the temperature and humidity range required for your application. For example, there are applications with very low dew points (e.g. in compressed air systems) or with higher dew points (e.g. in air conditioning systems).
• The accuracy of the sensor is particularly important if you need precise humidity values. In many industrial processes, measurement deviations of ±1 °C or better are common.
• Depending on the application, different specifications may be required. In industry, dew point sensors should be robust and resistant to harsh environments, while in building services or air conditioning, the focus is on long-term stability and energy efficiency.
• The dew point sensor should be suitable for the temperature range in which it is used. Some sensors can also operate under extreme temperatures (e.g. in cryogenics or high temperature environments).
• If the dew point sensor is used in a system with high pressure (e.g. in compressed air or gas systems), make sure that the sensor is designed for the corresponding pressure.
• If the sensor is used in potentially explosive environments (e.g. chemical plants or refineries), it should have appropriate certifications such as ATEX or IECEx.
• In dynamic environments where temperature and humidity can change rapidly (e.g. compressed air systems or air conditioning systems), the sensor should respond quickly to fluctuations. A short response time can prevent process delays and potential damage.
• Pay attention to the IP protection class (e.g. IP65 or IP67), which ensures protection against dust and water if the sensor is used in harsh or humid environments.
• In industries such as chemical or food processing, dew point sensors should be resistant to aggressive chemicals or corrosion.
• Dew point sensors should be easy to calibrate, especially in applications where high precision is critical. Check if the manufacturer offers calibration services or if the sensor can be easily calibrated on site.
• Some dew point sensors require regular maintenance or cleaning (e.g. chilled mirror dew point sensors), while others, such as capacitive sensors, are low maintenance.
• Consider whether the sensor offers analog outputs (e.g. 4-20 mA, 0-10 V) or digital interfaces (e.g. RS485, Modbus, Profibus) for integration into your existing systems.
• Some modern dew point sensors have integrated data loggers that make it possible to store measured values over a longer period of time and evaluate them later.
• Check whether the sensor supports wireless connections (e.g. Bluetooth or WLAN) if you want to integrate remote monitoring or cloud-based applications.
• For applications with high accuracy requirements, such as in the pharmaceutical or food industry, the dew point sensor should provide calibrated and certified measured values. Check whether the sensor is certified according to international standards such as ISO, NIST or others.
• A sensor with good long-term stability reduces the frequency of recalibrations and increases reliability in long-term processes.
• The cost of the dew point sensor should be in proportion to the requirements and expected lifetime. More expensive models often offer higher accuracy and better longevity.
• Also consider the operating costs, such as maintenance requirements or calibration intervals. Low-maintenance sensors can be more cost-effective in the long run.
• Choose manufacturers that offer technical support and a warranty for their products. This is particularly important if the dew point sensor is used in critical applications.

When purchasing a dew point sensor, you should consider the exact application area and environmental conditions. Factors such as measurement accuracy, response time, robustness, calibration and maintenance as well as compatibility with your existing systems play a key role. High-quality sensors with precise calibration and a long service life are often the better choice in demanding applications, even if they have higher acquisition costs.

Dew point sensors can be purchased from various suppliers. Comprehensive information about manufacturers and suppliers of Dew point sensors from all over the world can be found on Exportpages.