Vaisala Introduces Dew Point Transmitter for Ultra-Dry Processes

Moisture measurement for ultra-dry industrial environments
In sectors such as lithium-ion battery production, semiconductor manufacturing and high-purity gas processing, extremely low moisture levels are required to maintain product quality and prevent chemical reactions or corrosion. Monitoring these ultra-dry conditions requires highly stable and precise measurement instruments capable of detecting even small variations in humidity.

To support these environments, Vaisala has introduced a new dew point transmitter designed to measure residual moisture in processes operating at very low dew points. The instrument is intended for industrial and OEM systems where accurate humidity control is critical for maintaining stable manufacturing conditions.

The transmitter measures dew points down to –80 °C, enabling monitoring of extremely dry gases and process environments where water vapor concentrations remain at parts-per-million levels.

Improved response time and connectivity
The new transmitter replaces a previous generation device while maintaining compatibility with the same sensing technology. The instrument uses the company’s DRYCAP humidity sensing technology, which combines a capacitive polymer sensor with signal processing algorithms designed for stable measurements in low-moisture conditions.

Compared with earlier systems, the transmitter introduces faster response times and modern connectivity interfaces while maintaining the same measurement principle. Faster response allows operators to detect humidity excursions more quickly, helping prevent product defects or process interruptions in ultra-dry environments.

The device can be integrated into industrial automation systems through Modbus RTU communication over RS485, allowing direct connection to programmable logic controllers (PLC) and distributed control systems (DCS). For local configuration and diagnostics, the transmitter can also be used with portable instrumentation and compatible transmitters that provide additional analog outputs and display options.

Applications in battery and semiconductor production
Ultra-dry conditions are essential in several high-technology manufacturing sectors where even small amounts of moisture can affect materials or chemical reactions.

In lithium-ion and solid-state battery manufacturing, dry rooms and glove boxes must maintain extremely low humidity to prevent lithium compounds from reacting with moisture. Similarly, semiconductor fabrication facilities require controlled moisture levels in cleanrooms, gas delivery lines and process tools to avoid contamination during wafer processing.

Other industrial applications include compressed air systems, electronics manufacturing, pharmaceutical production and precision equipment testing, where humidity monitoring helps maintain consistent process performance.

The transmitter can also be integrated into OEM equipment such as compact dryers, glove boxes and environmental test chambers, enabling manufacturers to monitor moisture levels directly within their systems.

Long-term stability in demanding conditions
Measurement stability is a critical requirement for dew point monitoring in ultra-dry environments. Drift or sensor degradation can lead to inaccurate readings, affecting quality control and process alarms.

The transmitter is designed for long-term measurement stability with minimal maintenance and can tolerate demanding industrial conditions such as occasional condensation or wet exposure. The sensing system can recover from such conditions without permanent drift, supporting consistent operation in environments where moisture levels fluctuate during maintenance or system start-up.

An integrated auto-calibration function continuously corrects measurement drift, helping maintain accurate readings over time. A chemical purge function is also available for processes where moderate chemical contamination may occur, enabling the sensor to maintain reliable performance when exposed to certain gases.

Field verification and portable measurement capability
For system validation and maintenance, the transmitter can be paired with a portable handheld device designed for in-situ diagnostics and verification. With this configuration, engineers can perform spot checks, verify installation locations and record traceable dew point measurements down to –80 °C directly within operating processes.

The portable configuration allows multiple measurements to be monitored simultaneously, enabling before-and-after comparisons during maintenance or process adjustments.

Calibration and lifecycle support
For quality-controlled industrial environments, humidity instruments must be periodically calibrated to maintain traceability and measurement accuracy. The transmitter can be calibrated through factory services that provide traceable calibration certificates and verification against original instrument specifications.

Such calibration support helps manufacturers maintain compliance with internal quality systems and industry standards while ensuring long-term reliability of moisture measurement systems used in critical production processes.

www.vaisala.com

Edited by Industrial Journalist, Natania Lyngdoh.

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