SmartDGA EZHub™

Each SmartDGA solution package includes a SmartDGA EZHub™ unit to make online DGA easy by simplifying installation and connectivity. As the hub for the system, the unit is capable of handling the power and communication needs for the entire solution.

Features of the SmartDGA EZHub unit:

  • Single point connectivity for power and communications to SmartDGA® instruments
  • Status light indicators for each instrument
  • Internal memory for storage of collected data.
  • Rapid data download using USB
  • Simple face plate connections
EZHub for simplifying installation and connectivity

The SmartDGA EZHub™ unit is the central node for the SmartDGA® system. The EZHub can support a Gauge instrument for the LTC and a Guard or Guide instrument for the transformer. All interface functions and interconnects are provided in the EZHub device as well as internal memory, and four (4) relays with bright LED indicators to indicate Caution, Warning, and Alarm gas level, rate, and ratio conditions. The fourth relay provides status information on the SmartDGA® system itself.

The SmartDGA® instrument collects DGA gas level data and stores it in the EZHub. The data can be transferred (via RS485 or Ethernet connections) from the EZHub and displayed on the DGA Viewer software running on a computer or on an iCore controller.


Multiple EZHub™ Setup with Ethernet Hub or Switch

Multiple SmartDGA EZHub Setup with Ethernet Hub or Switch

Technical Data

Operating Temperature* -50 to 55 °C 
Storage Temperature -50 to 70 °C
Storage Humidity (non-condensing) 1-99% RH
(L x H x D)
10.3” x 5.7” x 6”
Weight 6.61 lbs
Standards Compliance
The SmartDGA system underwent thorough testing and complies with the following standards.
Emissions / Immunity

EN 61000-6-5 (2001)

EN 61000-6-4 (2007) +A1

EN 61000-3-2 (2006) +A1

EN 61000-3-3 (2008)

Environmental / Vibration ETSI EN 300 019-2-4
Surge Protection 4000V (IEEE C37.90.1-2002)
EZHub™ & LumaSMART iCore™ Specifications 

Power Supplied to EZHub & iCore

90 ~ 264 VAC, 127 ~ 370 VDC, 47 ~ 63 Hz, 6.5 A max

Power Supplied to Instrument 48 VDC ~ 4.16 A max


Up to 40+ years worth of data storage available with optional iCore

Data Export (Available with EZHub and iCore/PC) Export of results to date in a single file onto a USB memory stick. When using iCore/PC, user can select date range; when using EZHub port, all data is exported

Available Communications (Available with EZHub)

Proprietary communications via RS485 and Ethernet connections to DGA Viewer software

Optional Communications (Modbus available with PC, others available with iCore) IEC61850 Edition 2, DNP3 IEEE Std 1815-2012, Modbus RTU V1.02, Modbus TCP/IP 1.0b protocols
EZHub Alarm Contacts  (3) programmable relay outputs (Type C, NO/NC) for caution, warning, & alarm (1) alarm relay output for system status (Type C, NO/NC)
Relay Contact Ratings Single phase alarm relays (8 A, 250 VAC; 5 A, 30 VDC)

*For operating temperatures less than -20 °C, the cold weather cable is required. Additional eating of oil transfer lines may be required for operation in cold locations. The unit will generate a system fault if the mineral oil temperature is outside of standard fluid limits of -20 and 120 °C. For operating in environments where the temperature routinely exceeds 40 °C, the high temperature accessory is recommended to prevent premature aging and reduction of component lifetime. Temperatures are based upon air temperatures for unit installation in shaded location.

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