Optimus™ DGA Monitor OPT100

Advanced DGA – now also for natural esters

The world’s first maintenance-free multi-gas DGA monitor, the Optimus™ OPT100 now runs on on all ester liquids and mineral oils. The OPT100 comes with the groundbreaking, robustly reliable total gas pressure method for detecting ambient air leaks into your sealed power transformer. That’s robust technology enabled by Vaisala science.

No consumables of any kind required.

  • No carrier or calibration gases to monitor or replace
  • No internal column or measurement components to replace
  • No fixed filters, filter wheels, membranes or capillary tubes to repair or replace

Patented. Trusted. Reliable.

Ensure your power transformer stays operational longer. OPT100 brings unmatched long-term stability, reliability and measurement performance for the detection of any formation of fault gases. It is trusted for its patented infrared measurement of DGA gases, unique vacuum gas extraction technology and its groundbreaking total gas pressure measurement to detect air ingress into a sealed transformer tank.

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Total gas pressure explained

Key benefits

Works in the harshest environments

Robust performance. That’s Optimus™ OPT100. Stainless steel pipes, IP66-rated housing, temperature controlled gas and oil handling, magnetic pump and valves. With no consumables to service or replace, Optimus™ OPT100 simply works – from the arctic to the tropics.

Intelligent and intuitive

Integrated web UI. That’s Optimus™ OPT100. No need for additional software. It's designed for quick installation in the field — connect the oil pipes, power up, connect to the UI, and commission. What’s more, self-diagnostics allow the monitor to restart its operation automatically after a power cut.

Peace of mind

No false alarms. That’s Optimus™ OPT100. Its unique auto-calibration ensures long-term stable online measurement. No recalibration at factory is needed.

Runs on natural and synthetic esters as well

The Vaisala Optimus™ OPT100 is fully compliant with all ester insulation liquid. Deliveries will start in the Spring of 2024.

AC and DC power options available

The DC-powered Optimus complies with the same IEC61010 safety certification and comes with the same level of surge protection as the AC model.

Word from our customers

“Over two years after installation we have had no problems with the equipment at all – no user intervention and no consumables have ever been needed.”
- Eduardo Briosso, Asset Maintenance Manager at CTM.

“We have compared the data from the OPT100 with our third-party professional offshore testing report and it has proven to be very accurate, so we know we can rely on its performance.”
- A person in charge at Dalian Company.

“The OPT100 gives us the ability to track any disturbance that may occur and extend the lifetime of our transformer, as well as reducing the possibility of any unplanned outages.”
- Keith Black, System Performance Senior Engineer at Scottish Power.

Further reading


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.

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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.

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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.

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Customer case

Vaisala Optimus™ DGA Monitor OPT100 produces real time information about fault-generated gases in transformers for Fingrid

Finnish transmission system operator Fingrid Oyj acquired new Vaisala Optimus™ DGA Monitor OPT100s to monitor fault-generated gas levels in its transformers.

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Customer case

Offshore wind farm benefits from maintenance-free power transformer monitoring

Two Vaisala Optimus™ OPT100 DGA monitors were installed on key transformers to provide accurate, real-time condition updates

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Improved DGA Monitoring — Measuring Total Gas Pressure

Discover new ways of reliably identifying oxygen-nitrogen ratios within your power transformer. Gain perspective from Senior Industry Expert Senja Leivo on new breakthrough developments in DGA monitoring.

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Understanding the uncertainties of DGA monitoring

Online DGA monitors, which measure all 7 key fault gases, can identify all types of internal transformer faults at an early stage, when they might otherwise go unnoticed between regular oil sampling intervals.

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Customer case

Identifying hot spots with the OPT100 online DGA monitor

The Vaisala OPT100 was installed at CTM Salto Grande on the Argentina – Uruguay border, to evaluate gassing problems on a 50/50/100 MVA transformer.

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