ETI EDH-4 Small-System Waveguide Air Dehydrator

ETI EDH-4 Small-System Waveguide Air Dehydrator

The ETI NETCOM EDH-4 is a compact, non-regenerating air dehydrator that automatically supplies clean, dry, positive-pressure air to small-volume antenna waveguides and coaxial-cable systems.

Designed for C-, X-, Ku- and Ka-band applications, the EDH-4 provides 0.87 psig (59.9 mbar) output pressure with a maximum flow rate of 6.0 scfh (2.8 lpm). It helps prevent moisture, dust and small particles from entering transmission lines, improving signal reliability and extending equipment life.

A front-panel LED display shows air pressure, estimated desiccant capacity and error codes in selectable English or SI units. The color-indicating desiccant changes from bright orange to white as it absorbs moisture, while a compressor-runtime alarm indicates when the canister should be inspected. The desiccant canister is accessible from the front for convenient replacement or manual regeneration.

Model: EDH-4 Rev A
Order Number: 18021
Application: Small-volume waveguide and coaxial-cable dehydration
Recommended Bands: C-, X-, Ku- and Ka-band
Dehydrator Type: Non-programmable, single-canister desiccant dehydrator
Output Pressure: 0.87 psig (59.9 mbar)
Maximum Flow Rate: 6.0 scfh (2.8 lpm)
Standard System Capacity: 18 scf (510 liters)
Maximum System Capacity: 45 scf (1,274 liters)
Outlet Dew Point: -40°C with new or regenerated desiccant to -10°C when regeneration or replacement is required
Regeneration Method: Manual regeneration or desiccant replacement
Regeneration Indication: Desiccant color change and compressor runtime
Display: Digital LED display with selectable English or SI units
Displayed Information: Air pressure, estimated desiccant capacity and error codes
Alarm Output: Relay, 2 A at 30 VDC
Relay Connection: 6-position terminal block
Supply Voltage: 100-240 VAC, 50/60 Hz, auto-selecting
Power Consumption: 22 W maximum at 120 VAC
Discharge Port: Single 1/8-inch NPT female port with 1/4-inch hose barb
Operating Temperature: 0°C to 55°C
Storage Temperature: -40°C to 60°C
Dimensions: 5.22 x 11.63 x 7.0 in. (133 x 295 x 178 mm)
Weight: 7.8 lb (3.54 kg)
Mounting: 19-inch or 13.5-inch rack, wall, shelf or tabletop
Rack Space: 3U
Reliability: 100,000-hour MTBF
Warranty: Two years

Replacement Parts

• 25016: Replacement Desiccant Canister for EDH-4 Rev A
• 18138: Replacement Desiccant, 32 oz. (0.95 liters)

Key Features

• Automatically pressurizes small waveguide and coaxial-cable systems

• Supplies clean, dry air at 0.87 psig

• Maximum flow rate of 6.0 scfh

• Suitable for C-, X-, Ku- and Ka-band applications

• Helps prevent moisture, dust and small particles from entering transmission lines

• Digital LED pressure and status display

• Selectable English or SI display units

• Color-indicating desiccant for convenient visual inspection

• Compressor-runtime alarm indicates when desiccant service is required

• Front-panel access simplifies desiccant-canister replacement

• Desiccant can be replaced or manually regenerated

• Rack, wall, shelf and tabletop mounting options

• Auto-selecting 100-240 VAC power supply

• Quiet, low-energy operation