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Generator Gas Dryer

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Water, oil, and other contaminants cause corrosion in critical areas of electric power generators, resulting in diminished efficiency and increasing the likelihood of forced outages. Increased dew point levels also detract from generator efficiency by increasing windage losses. E/One's Generator Gas Dryer (GGD II) is a dual-chamber system that continuously dries and recirculates generator cooling gas — even when the generator is on turning gear, which is a critical time to maintain low dew point.

Column regeneration is automated and takes place based on programmable inlet and outlet dew point levels. The GGD II has a secondary, programmable, time-based regeneration feature, allowing you to set maximum times between regeneration (from 10 to 30 days).

Contact E/One to arrange a dew point site evaluation by our Field Service Technicians. We'll sample your hydrogen cooling gas with NIST-traceable portable dew point and hydrogen purity analyzers and then issue a report to site engineering regarding our findings.

  • Increased generator efficiency and reduced downtime 
  • Comprehensive water and contaminant removal
  • Microprocessor controlled
  • Flameproof, explosion-proof, and intrinsically safe design
  • Self-monitored drying process
  • Standard electrical actuator, or optional pneumatic
  • Two-wire, Modbus communications (RS 232/485, 9600 Baud) available
  • Compact design great for retrofits (83" H x 27" W x 38" D)


Input Voltage 400/600 VAC Three Phase
Input Frequency 50/60 Hz
Input Power 3,000 Watts
Inrush Current 3.5A
Ambient Temperature 32 F to 125 F (0 C to 52 C)
Maximum Pressure 100 psi
Ambient Location Zone II, Group II, H2
Output, Relays 5A @ 250 VAC
  5A @ 30 VDC
  100 mA @ 125 VDC
  Dew Point High, NO and NC
  Trouble, NO and NC
Output, Signals 4-20mA current output (self-powered)
  Input Dew Point
  Outlet Dew Point
  2-wire, Modbus RS232/485, 9600 Baud
Inlet & Outlet Connections 3/4" ANSI Class 150 RF Flanges
Vent Connection 1/2" ANSI Class 150 RF Flange
Alternate Regeneration Connection 1/4" Compression Fitting
Typical Flow Rate 8-12 ACFM, Hydrogen
Typical H2 Consumption per Regeneration 360 ft3 (10 meters3)

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