netcom EDH-4

Low Cost, Manual Regeneration Air Dehydrator

The EDH–4 dehydrator addresses the need for a low cost, non-regenerating air dehydrator for pressurizing small volume waveguides and coax. It is especially suited for C, X, Ku, and Ka band applications.
The output pressure is 0.5 psig (34.5 mbar) with a maximum flow rate of 6.0 scfh (2.8 lpm). It is intended for use in systems smaller than 18 cubic feet (510 liters). The EDH–4 indicates pressure and status on a bright red LED display. Display parameters are user selectable in English or SI units.


  • Provides cost effective dry air at 0.5 psig (34.5 mbar)
  • Prevents vapor, dust, and small particles from entering small systems
  • Improves transmission reliability by protecting against reflection
  • Dry, clean, positive pressure extends equipment lifetime
  • International capability
  • 120/230 volt 50/60 Hz operation
  • Selectable English or SI calibration
  • Simple to install and operate
  • Brackets supplied for rack mounting, wall mounting, and feet for shelf or bench top use
  • Convenient front panel access for easy replacement of desiccant canister
  • Low energy usage
  • Quiet


Dehydrator Type Non-Programmable, Single Canister, Desiccant Dehydrator
Regeneration Method Manual Regeneration or Replacement
Regeneration Indication Desiccant Color Change and Compressor Run Time
Outlet Dew Point -40°C (New or newly regenerated desiccant) to -10°C (Desiccant requiring regeneration or replacement)
Outlet Pressure 0.3 psig – 0.5 psig (34.5 mbar)
Flow Rate 6.0 scfh (2.8 lpm)
Capacity 18 scf (510 liters) standard, 45 scf (1,274 liters) max
Discharge Port Single Port: 1/8 inch NPT female fitting, 1/4 inch (6.4 mm) hose barb
Relief Valve Pressure 1.8 psig (124 mbar)
Supply Voltage 100 – 240 VAC Auto-select
Typical dew point Below -40° C
Pressure 0.5 psig standard
Flow Rate 6.0 scfh standard
Supply Voltage 100 – 240 VAC 50/60 Hz, Auto-select
Power Requirement @120 VAC: 22 watts maximum; 8.3 watts minimum
Reliability MTBF: 100,000 hours


Air Pressure Indication Digital Display (English or SI)
Data Display Pressure, Estimated Desiccant Capacity Remaining, Error Codes
Communications Port Alarm Relay
Alarm Relay Capacity 2 Amp @ 30 VDC
Relay Connection 6-position terminal block


Dimensions 5.22″ × 11.63″ × 7.0″
(133 mm × 295 mm × 178 mm)
Weight 7.8 pounds (3.54 kg)
Mounting 19″ or 13 1/2″ Rack (3U space required),
wall mount, shelf or table top


Storage Temp -40°C to 60°C
Operating Temp 0°C to 55°C


Order Number Description
18021 EDH–4 Low Cost Air Dehydrator (Revision A)
25016 Replacement Desiccant Canister for EDH-4 (Revision A)
18138 Replacement Desiccant, 32 ounces (0.95 liters)

We're dedicated to our customers

From the front office to the production floor, we go above and beyond to help make your project successful.

We're dedicated to our customers

From the front office to the production floor, we go above and beyond to help make your project successful.

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