dissolved gas analysis
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DELPHI Dissolved Gas Analysis Instruments ® The Doble Delphi is a dissolved gas analysis (DGA) monitor that helps you track transformer health by providing early warning signs of problems such as overheating, insulation degradation or mechanical movement within the unit. The Delphi provides this valuable information in real time, second by second. The Delphi is immune to oil surges and vacuums that may affect other sensors; in addition, the Delphi contains self-testing diagnostics to monitor its own performance. Use the Delphi as part of your comprehensive fleet management program or to monitor smaller transformers in a cost-effective manner. • Cost-effective updates on transformer health between regular DGA samples • Alerts you when there is a sudden change in DGA levels due to a developing fault within the transformer • Notifications give you time to plan instead of reacting to a failure • Actionable intelligence helps you determine what steps to take: maintenance, testing, load management or replacement • Patented vacuum resistant membrane prevents failure during oil surges, maintenance or other activities • Available as a composite gas monitor or hydrogen monitor in standard, mini and stand options • Self-testing provides assurance of reliable results • Built-in pump for standard or stand Delphi models is used for forced circulation of oil when the flow in the main transformer pipework may be slow • Optional moisture sensor is available for more comprehensive monitoring and loading decisions

Technical Specifications Inputs and Outputs Standard Output Moisture version Hourly Trend (Scaled 0 - 5000 ppm) Water Content, %RS (Scaled 0 - 100%) If composite, Hydrogen and these additional gases: Carbon Monoxide Optional Output Alarm Types Normal | Gas Hi | Gas Hi-Hi (also indicated on front panel) External Alarm Indicators Green = Normal | Orange = High | Red = High-High Support Networking Windows 2000/XP/7 2-8% Accuracy, Limit of Detection, Response 2 ± 10% reading or ± 20 uL/L (ppm), whichever is greater Response time to 80% step change Response time to 100% step change ≤ 60 minutes...