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InsuLogix – Hydrogen Monitor

A simple, but high-tech, online H2 monitor, it will provide a low cost solution to catch faults in your transformer, giving you the opportunity damage or costly repairs.

Weidmann transfomer monitor

Hydrocarbon oils are used as insulating fluids in electrical equipment because of their high dielectric strength and chemical stability. Under normal operating conditions they are very stable. However, when a fault occurs, the oil insulation will undergo chemical degradation. The faultinduced breakdown products are low molecular weight gaseous compounds that are soluble in the oil. Quantitative analysis of the gases present in the oil allows Overheating, and Arcing. Hydrogen is the key element for
warning signs because hydrogen is produced in all fault conditions. The InsuLogix® H can protect your transformer by quickly and accurately warning you of these faults.

The InsuLogix® H Hydrogen Monitor incorporates patented micro-chip and coating technologies onto the palladiumnickel sensor, allowing it to directly contact the oil without membranes,filters or other gas extraction means. It measures Hydrogen in oil or gas phases.

PYROLYSIS (overheating)

  • Low temperature Hydrogen, Methane, Ethane
  • High temperature Hydrogen, Ethylene, Methane, Ethane


  • Hydrogen


  • Hydrogen, Acetylene, Methane, Ethane, Ethylene

InsuLogix® H Specifications

  • Measurement Range (H2) 25 – 5,000 ppm
  • Accuracy (H2)  20% of reading or 25 ppm, whichever is greater
  • Repeatability (H2) 10% of reading or 15 ppm, whichever is greater
  • Response Time (H2) < 60 minutes (50% of step change)
  • Operating Temperature (Ambient) -40°C +55°C
  • Storage Temperature -40°C +85°C
  • Oil Temperature Range -40°C + 105°C
  • Data Storage (Flash Memory) 1 year at one hour testing intervals
  • Cross-sensitivity to Other Gases (CO2, C2H2, C2H4, CO, etc.):  < 2%
  • Relays:  Three Relays, two user configurable, NO & NC with one common
  • Analog Output 1 x 4-20 mA
  • Serial Output and Protocol RS232, RS485, MODBUS, DNP3
  • Expected life > 10 years
  • Installation: Compression Fitting
  • Weight, Dimensions:   1.3 kg (2.8 lbs), l 15.88 cm x w 11.75 cm x h 7.94 cm (l 6.25” x w 4.625” x h 3.125”)
  • Power:  24V DC nominal (15 to 28V DC) – 30W Max or VAC PSU (110VAC-240VAC)
  • Warranty Two years
  • Standards EMI/EMC: IEEE STD C37.90.1, EN 55022/FCC PART 15 & EN 55024/EN 610004; IEC 60068-2-6; IP67 (IEC 60529), NEMA 6; CE Mark (IEC 61000)

• Quickly detects and alerts rising hydrogen levels
• Responds to utilities’ demand for an economically priced H2 monitor
• Low maintenance and durability mean the lowest total ownership cost for fault gas monitoring
• Simple set-up and operation
• Low total cost of ownership allows for mass deployment

• Micro-chip technology using palladium-nickel alloy
• Advanced proprietary coating
• Robust and tested technology platform
• Maintenance-free, no consumables, no moving parts
• 4-20mA output, three alarm relays, serial communication, MODBUS, data recording, DNP3

Download the datasheets and manuals for Hydrogen Monitor through our download centre

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