Moisture/Hydrogen/Temperature Transmitter monitors transformer.

Press Release Summary:

Used to measure moisture, hydrogen, and temperature directly in transformer oil, MHT410 provides real-time measurements and trend data to facilitate reliable decision-making and foster predictive maintenance planning. Features include adjustable probe installation depth; non-membrane technology-based hydrogen measurement; and maintenance-free design that does not require post-installation calibration/adjustment. Product does not employ pumps, hoses, batteries, or other consumable parts.

Original Press Release:

Vaisala Launches Reliable Moisture, Hydrogen and Temperature Transmitter for Online Transformer Condition Monitoring

High voltage transformers are a critical component in the generation and transmission of electricity. Today the power industry is facing the challenges of end-of-life equipment, impacts of overload situations, and an increasing number of faults in the network. All of these have significant consequences to the operation of transformers, and increase the risk of unexpected failures and outages. Through efficient monitoring however it is possible to successfully mitigate these issues. For example, by measuring the hydrogen content in transformer oil, as well as the speed of its formation, utilities can detect and assess the severity of a fault situation. Furthermore, moisture dramatically affects the life of a transformer; elevated moisture in oil levels accelerates the ageing of transformer insulation paper as well as the oil's ability to act as an insulator. Moisture content can change quickly and should be monitored to ensure reliable operation.

Vaisala's Moisture, Hydrogen and Temperature Transmitter MHT410 continuously monitors changes in high-voltage transformer insulating oil. Vaisala's unique probe solution allows the device to provide accurate real-time measurements and trend data which facilitates reliable decision-making. The MHT410 swiftly recognizes transformer fault conditions allowing our customers to resolve potential problems before any further damage is done. Having real-time data also allows for predictive maintenance planning which helps our customers minimize expensive service shutdowns and outages.

Reliable measurement thanks to unique probe design and robustness

Unlike conventional solutions, the MHT410 transmitter measures moisture, hydrogen and temperature directly in the transformer oil. Due to an innovative probe design with an adjustable probe installation depth, the sensors are positioned in direct contact with representative oil in the transformer providing accurate measurements and reliable data. The MHT410 is built to last; it doesn't have pumps, hoses, batteries or other consumable parts. A non-membrane technology, the hydrogen measurement has no service or replacement needs. Thanks to the robust design and reliable measurement technology the MHT410 makes false alarms a thing of the past.

Intuitive and easy to install

MHT410 integrates three critical measurement parameters in a single probe. Easy to install, the probe is ready to use within minutes. Adjustable probe installation depth fits in a variety of transformer valves to ensure optimal measurement. The unit is maintenance-free, with no calibration or adjustment required after installation.

MHT410 will be available summer 2015.

For more information, please contact:

Pekka Ravila


Targeted Industrial Applications

Phone: 09 8949 2359


For details, please visit

About Targeted Industrial Applications

Industrial customers represent industries such as power generation and transmission, maritime, automotive, semiconductor, electronics and building automation. They use Vaisala instruments for accurate and stable real time measurements to extend equipment lifetime, improve processes and end-product quality, as well as to optimize energy consumption and indoor air quality.

About Vaisala

Vaisala is a global leader in environmental and industrial measurement. Building on 79 years of experience, Vaisala contributes to a better quality of life by providing a comprehensive range of innovative observation and measurement products and services for chosen weather-related and industrial markets. Headquartered in Finland, Vaisala employs approximately 1600 professionals worldwide and is listed on the NASDAQ OMX Helsinki stock exchange.

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