Power industry solutions

Download our latest eBook

Turn your DGA data into Duval Triangles and Pentagon

Visualize the state of your power transformer, with Duval Triangles, Pentagon, and gassing trend graphs. Supports IEC & IEEE standards, as well as data import & export.

Try the DGA Calculator

Cut the guesswork – DGA reimagined

Electricity is the backbone of modern society. In today's world, being disconnected from power is unthinkable, even for the briefest intervals.

Vaisala's real-time online measurement transmitters are the choice of utilities & plants that want to safeguard critical assets, prevent unexpected outages, increase performance, and prepare timely maintenance plans.


Advanced DGA – Optimus™ OPT100

Our flagship DGA monitor is the ultimate choice for critical power transformers.

We reduced sampling to a minimum. So you can go fully online and enable 24/7, always-on monitoring, see more than a sampling-type spot check could, and uncover trends and gassing patterns. We also did away with gas cylinders, and all consumables. The end result? True zero-maintenance monitoring.


Better know better

Transformers across the world employ well over 10.000 Vaisala probes to monitor for moisture. Why? Because of our uniquely robust HUMICAP® sensor. Proven over 20+ years in service in the harshest environments on Earth and Mars.

Individual probes have come back for calibration checks after 10 years in service, without any maintenance, but with their sensors still within their initial accuracy. That's robust technology.


Why Vaisala


Technology that has proven itself in the toughest conditions on two planets. From the arctic to the tropics, to offshore.



We’re a science company at heart. It’s in our DNA to look deeper, and turn discoveries into practical advantages for our clients.


We help make sense of the unseen, uncover trends and deliver actionable information for decision-makers. Read more »

Power transformer monitoring product highlights

Vaisala’s Optimus™ DGA Monitor OPT100 for advanced dissolved gas analysis with total gas pressure method, detecting air leaks in transformers.

Optimus™ DGA Monitor OPT100

Ensure your power transformer stays operational longer. OPT100 brings unmatched long-term stability, reliability and measurement performance for detecting the formation of fault gases.
DPT145 Multiparameter Transmitter for SF6 Gas

Multiparameter Transmitter DPT145

Our uniquely capable Multiparameter Transmitter for SF6 gas opens for you the world of online measurement of dew point, pressure, and temperature. It also calculates four other values, including SF6 density.

From our experts


Natural esters and online DGA

While natural esters were previously confined to smaller transformers, particularly in distribution networks, their application is expanding to larger transformers, including the retrofilling of older mineral oil-filled ones. An expert blog by Senja Leivo.

Learn more

Video blog

Infrared DGA and aging oils – possible without recalibration?

Infrared technologies, whether PAS or NDIR, are a great option for DGA monitoring. Infrared also makes it possible to create a maintenance-free DGA monitor that does not need any recalibration — if you can solve the challenge of oil aging.

Learn more


Discover four core strategies to improve your power transformers' lifespan

Download this eBook and arm yourself with practical and scientific knowledge. Learn how you can protect your high-voltage assets and improve your operations through online DGA monitoring, and take better-informed decisions, on-time and on budget.

Learn more

Video blog

Eliminating measurement drift in online DGA monitoring

Get to know how Vaisala eliminates the effects of drift in DGA through IR reference measurement technology. This video blog has the answers to what drift is, why it matters and what you can do to prevent the effects of drift causing problems such as false alarms and breaks in production. 

Learn more


Practicalities of measuring moisture in transformers online

Vaisala's Senja Leivo and Riku Rantala go head to head to discuss practicalities and real-life lessons learned, tackle audience questions and offer highly valuable, directly applicable insights into measuring moisture in transformers.

Register to watch


Moisture in Transformers Q&A eBook

Filled with your actual questions answered by Vaisala's experts, this nearly 40-page eBook is a versatile manual for anyone whose business it is to maintain guard against and understand the effects of moisture in power transformers.

Learn more


The science of moisture in transformers

In four episodes, you'll get a deep dive into both the science and practice of moisture in oil and measuring it, culminating in a two Expert Q&A sessions with your insights & questions answered by the experts.

Learn more


More robust air leak monitoring for power transformers – Total Gas Pressure

Ever-increasing efficiency targets concern all industries and their assets. Power transformers are no different. Maximizing and extending their lifetime is all about meeting this challenge.

Learn more

Customer case

Using online DGA to safeguard a transformer's end-of-life operation

The following case study explores the detection of severe faults and the overall monitoring process and procedure during an old transformer's final months in service - it's end-of-life (EOL). 

Learn more