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Generator Gas Dryer (GGD II)

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 zero to 30 days).

eone generator gas dryer

Generator Gas Dryer Features and Benefits

  • Increased generator efficiency and reduced downtime 
  • Comprehensive water and contaminant removal
  • Microprocessor controlled
  • Designed for hazardous location operation
  • Self-monitored drying process
  • Standard electrical actuator
  • Compact design (29.75" w x 83" h x 38" d)

Download the GGD brochure

Generator Gas Dryer Specifications

Technology Principle Molecular sieve as a drying medium
Typical Flow Rate 8-12 ACFM, Hydrogen
Typical H2 Consumption per Regeneration 90 ft3 (2 meters3) per generation for Mode 2 Regenex(TM)
Input Voltage 400/480 VAC Three Phase
Input Frequency 50/60 Hz
Input Power 3,000 Watts
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 
Area Classification Class I, Zone 2, Group IIB + H2
Ambient Temperature  32 F to 125 F (0 to 52 C)
Maximum Pressure 100 psi
Overall Dimensions 83" H x 29.75" W x 38" D
Inlet & Outlet Connections 3/4" ANSI Class 150 RF Flanges
Vent Connection 1/2" ANSI Class 150 RF Flanges

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Generator Humidity Monitor (GHM)ghm

High moisture content (dew point) in hydrogen cooling gas is undesirable and can lead to a breakdown in the insulating system or assist in the development of stress corrosion cracking in retaining rings.


The supply of clean, dry hydrogen alone cannot assure low moisture content within the generator case because moisture vapors may be present in the seal oil system.

Knowing your dew point is critical. E/One’s Generator Humidity Monitor is a reliable, self-contained, panel-mounted system that provides continuous measurement of the moisture content. The combination of an advanced ceramic moisture sensor coupled with superior digital measurement circuitry provides a real time, stable reading. All sensors are fully interchangeable without the need for display recalibration. The dew point is indicated locally on an LCD display and remotely via a 4-20 mA output that corresponds to -100 to +20 C or -148 to +68 F (optional).

Generator Humidity Monitor Features and Benefits

  • Advanced ceramic moisture sensor
  • Superior digital measurement circuitry
  • Designed for hazardous location operation
  • Measurement range of -148 to 68 F (-100 to +20 C)
  • 4-20 mA linear output signal
  • Ambient temperature of 40 F to 140 F
  • Interchangeable sensors
  • NIST traceable
  • Universal power input, 120/240 VAC

Download the Generator Humidity Monitor brochure

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