Fuel cell efficiency through humidity intelligence

Energizing the hydrogen economy

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Advancing the hydrogen economy has a significant impact on reducing our carbon footprint. Fuel cells have a special role to play in this future vision, but they depend on reliable humidity data. The concise 3-minute video will cover some future insights about the hydrogen economy and the use of fuel cells. You will also see how humidity data is related to fuel cell quality. 

Next, get immediate access to presentation "Fuel cell R&D – Future trends, drivers and applications" for further insights from our Senior Strategy & Business Development Manager Anu Pulkkinen.


Vaisala is a leading provider of humidity measurements in PEM fuel cell testing. Our sensors use our proprietary HUMICAP technology, ensuring reliable data even in the most challenging measurement conditions. Warmed-probe technology is our innovation for high-humidity environments. The heating function keeps the sensor continuously above the ambient temperature, ensuring condensation never forms. This minimizes the recovery time between measurements and increases the efficiency of fuel cell testing.

Fuel cell testing doesn't have to test your patience

An efficient PEM fuel cell testing process can save you hours. That is possible when you don't have to wait for your humidity instrument to recover from condensation. The recovery time depends on the technology and stability of the probe. 

In the visualization, the Vaisala HUMICAP® probe A has a heating functionality, whereas the probe B is non-heated. When 100% relative humidity (RH) is reached, probe A recovers quickly to show accurate humidity readings whereas B recovers very slowly.

Fuel Cell Humidity Lab

Are you curious about the impact of humidity measurement on the outcome of PEM fuel cell testing? Get free access to our Fuel Cell Humidity Lab webinar sessions hosted by our Product Manager Juhani Lehto!

Each session is under 30 minutes, so you can use your time efficiently by getting just the key facts. Learn more about each session below and register to ensure your virtual seat.

Juhani Lehto

Compact and compatible. Vaisala HUMICAP® HMP7 for high humidity conditions.

Vaisala HUMICAP® HMP7 measurement probe thrives in applications which involve constant high humidity or rapid changes in humidity such as humidifiers, drying and test chambers, combustion air and measurements where performance and chemical tolerance are essential. 

Moreover, the HMP7 is compatible with our robust Indigo500, Indigo300 and Indigo200 transmitters, which enable easy data evaluation and visualization.



Easy to integrate. Vaisala HUMICAP® Humidity and Temperature Module HMM170 for high humidity conditions.

This robust, open frame transmitter is the ideal choice when you need to integrate the device into fuel cell test equipment or other environmental chamber.  The sensor tolerates high humidity, vacuum as well as high pressure conditions.

The integration is easy. Both digital and three configurable analog output channels are available, ensuring compatibility for most chamber types. In addition to relative humidity and temperature, also dew point and other calculated parameters are available. An integrated service port enables quick configurations.


Optimize hydrogen drying in the electrolysis process

Take control of the hydrogen drying process

The H2 drying process improves the quality and performance of hydrogen gas by preventing corrosion, insulation failure, and combustion issues. Dew point measurement helps optimize this process through better hydrogen quality and lower energy use, as excessive use of warm drying air can be avoided.

The key specifications in a dew point measurement instrument are accuracy and long-term stability. Vaisala DRYCAP® instruments have been developed to meet these requirements. See our DRYCAP® options below.

Miniature Dew Point Transmitters DMT143 & DMT143L (Long)

Miniature size dew point transmitters DMT143 and DMT143L are ideal choices for integrating dew point measurement to a hydrogen dryer or other equipment where the operation range is -70 ... +60 °C (-94 ... +140 °F). 

The products incorporate Vaisala DRYCAP® thin film polymer sensor and auto-calibration software. The standard sensor choice for dry gases and desiccant dryers is the DRYCAP 180M, and for more humid applications such as refrigeration dryers, the DRYCAP 180S is optimal.


Dew Point and Temperature Probe DMP7 for remote installations in tight spaces

Vaisala DRYCAP® Dew Point and Temperature Probe DMP7 is made for tight spaces and low-humidity applications. Its short probe length makes it suitable for installations that have limited space such as industrial drying systems. 

The DMP7 is compatible with Indigo series transmitters for easy data evaluation and visualization.


Dew Point and Temperature Probe DMP8 with adjustable installation depth for pressurized pipelines <40 bars

Vaisala DRYCAP® Dew Point and Temperature Probe DMP8 is designed for industrial low-humidity applications, such as industrial drying, with pressure up to 40 bars. 

The DMP8 is compatible with Indigo series transmitters for easy data evaluation and visualization.