Dew point meter
Maintaining the dew point of your compressed air or gas system ensures a longer life for your equipment and reduces maintenance costs. It is therefore recommended that the humidity level of your installation is constantly monitored. Our dew point sensors, also known as dew point meters or dew point monitors, provide accurate dew point measurement of your factory’s pipelines. This insight helps you avoid exceeding acceptable limits. VPInstruments’ dew point sensors are designed with ease of use in mind and come with all the features needed to make installation and operation as simple as possible.
The right dew point meter for every situation
Our range of dew point sensors includes two dew point meters: the VP Dew Point Sensor and the Dew Point Sensor – extreme dry air. The VP Dew Point Sensor has a very large measurement range and is adequate for most of your dew point measurement applications (refrigerant and desiccant type dryers). The second one is specifically designed for applications with extremely dry air. The calibrated dew point meters can be incorporated directly into VPVision or they can be connected to your compressed air or gas management and control system.
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“For manufacturers using compressed air VPInstruments provides excellent measurement solutions including flow meters, dew point sensors and monitoring systems that allow you to identify and eliminate energy losses in your factory. Kudos to the VPInstruments Team.“
– Matthew Waita, Ren Engineering Solutions
Real-time insights with a dew point sensor
Continuous monitoring with a dew point meter offers valuable, real-time insights into your system’s performance. By measuring the dew point constantly, you gain a clear understanding of the moisture levels within your compressed air or gas systems. This allows you to proactively manage humidity, ensuring optimal conditions for your processes. With integrated data, you can monitor trends over time and make informed decisions to prevent issues like corrosion, contamination, and inefficiencies. The real-time data can be seamlessly integrated into your existing management system, enabling automated responses to changing conditions and optimizing performance. Continuous monitoring also provides early warnings of potential problems, giving you the ability to address issues before they affect production or cause damage to equipment. By leveraging this detailed, real-time information, you can improve reliability, reduce maintenance costs, and enhance the overall efficiency of your operations.
What is a dew point meter?
A dew point meter is an instrument used to measure the dew point temperature of a gas, which indicates how much moisture is present.
The dew point is the temperature at which water vapor starts to condense into liquid. A lower dew point means drier air or gas, while a higher dew point indicates more moisture.
In industrial environments, dew point meters are essential tools for monitoring gas quality and ensuring reliable operation of compressed air and gas systems.
Why is dew point measurement important?
Dew point measurement is critical because moisture in compressed air or gases can cause serious operational issues, such as:
- Corrosion and rust in pipelines
- Contamination of products and processes
- Equipment failures and downtime
- Freezing or blockages in systems
- Growth of microbes resulting in safety issues
By monitoring the dew point, manufacturers can:
- Maintain consistent product quality
- Ensure compliance with air quality standards
- Optimize dryer performance and reduce energy consumption
- Prevent costly damage and inefficiencies
What gases or systems can it monitor?
Dew point meters are suitable for a wide range of compressed air and technical gas systems, including:
- Compressed air systems
- Nitrogen (N₂)
- Oxygen (O₂)
- Carbon dioxide (CO₂)
- Argon (Ar)
- Other non-corrosive gases
They are commonly used in manufacturing environments where gas quality and dryness are critical to process performance.
How do I install the dew point meter?
A dew point meter is typically installed directly in the compressed air or gas line or via a sampling chamber.
Best practices include:
- Installing downstream of dryers to verify air quality
- Placing sensors at critical points in the network where temperature drops may cause condensation or before critical processes
- Ensuring proper pressure and flow conditions for accurate measurement
Correct installation ensures reliable readings and helps detect issues such as dryer malfunction or moisture buildup early.
What outputs and interfaces does it support?
Modern dew point meters support a range of industrial outputs and communication interfaces, enabling seamless integration into monitoring systems:
- Analog outputs (e.g. 4–20 mA, voltage signals)
- Digital communication (e.g. Modbus, RS485)
- Alarm signals for threshold monitoring
- Integration with data loggers and energy management systems
These interfaces allow real-time monitoring, data analysis, and system optimization across the plant.
What is the measurement range of the dew point meter?
The measurement range depends on the application and technology, but industrial dew point meters typically cover:
- Approximately -80°C to +20°C (-112°F to +68°F) dew point for dry compressed air and gases
- Higher ranges (e.g. up to +50°C / +122°F) for less critical or refrigeration dryer applications
The VPInstruments Dew Point meter offers a wide measurement range of -70 to +60°C (-94 to +140°F), making it suitable for a broad range of industrial compressed air and technical gas applications.
Selecting the right range is essential to ensure accurate measurement and reliable monitoring in your specific process conditions.
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