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Item # DGH1130, DGH Series - Heatless Desiccant Dryers
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Global Air Treatment
Models DGH590-5400 are engineered to benefit you with an extremely heavy-duty robust package designed for the most demanding industrial
applications. Our in-line piping arrangement reduces installation times for those bigger installations. Rugged high capacity components ensure
long-life for tough applications in hostile environments.
- Pressure drop at rated flow is less than 5 psi
- Standard voltages: Controllers automatically identify and adapt the controller:
Basic: 100-120V/1ph/5-60Hz;
Standard and Energy Savings controller: 100-240V/1ph/50-60Hz & 12-24 VDC
- NEMA 4 Standard Feature with Standard and Energy Savings controllers
Inlet flows are established in accordance with CAGI Standard ADF-200: Dual Stage Regenerative
Desiccant Compressed Air Dryers-Methods for Testing and Rating. Conditions for rating dryers are:
inlet pressure of 100 psig, inlet temperature saturated at 100°F.
Average purge flow rate is the amount of purge air used during the regeneration portion of the
purge cycle (purge/repressurization valve open) plus the volume of air used to repressurize the
tower after the purge/repressurization valve closes averaged over the cycle time. At 100 psig, the
average purge rate is: 14.4% (13.7% for regeneration + 0.7% for repressurization) of rated inlet
flow for dryers operating on a 10 minute cycle; 15.5% (13.7% for regeneration + 1.8% for
repressurization) for dryers on a 4 minute cycle.
Outlet Flow: To determine flow of air available at outlet of dryer, subtract purge flow from inlet flow.
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1. Three Controllers to choose from
Basic controller offers reliable fixed cycle operation.
Standard controller includes fixed savings potential with Purge Optimizer
Energy Saving Controller for exact automatic purge savings
2. Standard Instrumentation
Left and right tower pressure gauges
Purge pressure gauge
Moisture indicator – alerts operator of elevated dew point
Throttling valve provides accurate purge pressure adjustment
3. Optional FIL Series Filter Packages with Bypass Systems
Convenient factory-mounted FIL Series prefilter/afterfilter packages with bypass available
Optional Element Monitors inform of optimal element change-out time
4. Large Desiccant Beds Ensure Consistent Dew Points
0.6 lbs (0.27 kgs) of desiccant per tower per scfm guarantees dry air
4.8 seconds of contact time for saturated air with the desiccant
30% extra desiccant provided to compensate for natural bed aging over the expected 3 to 5 years bed life
Large, cleanable, stainless steel flow diffusers ensure even flow distribution and eliminate channeling through the bed
Tower design saves 98% of the heat of adsorption
5. Reliable valves
Shiftmatic valves (on DGH 40-3000) automatically shift to the low pressure side of the circuit to control process flow on models.
Shiftmatic valve’s life has been tested to over 500,000 cycles with tough desiccant dust challenge
Position memory ensures drying continues, even with loss of electrical power to the dryer
5- year warranty on the shiftmatic valve. Parts and labor for the first full year of warranty.
Parts only in remaining years. Appropriately sized FIL prefilter must be installed at the same
time the dryer is installed to qualify for the 5-year warranty. Annual or more often element
maintenace must take place to maintain the warranty for the 5-year period.
Three-way pilot operated solenoid valves manage the pilot air flow to direct the purge/repressurization valves.
Quality butterfly switching valves, models 4100 and 5400
6. Certified Designs for Safety
ASME code constructed vessels comply with codes. Models 115 and larger are stamped.
Models are UL and CSA certified.
Pressure relief valves on each tower mounted after flow diffusers to prevent clogging
Heavy-duty mufflers for quiet operation
NEMA 4 electrical construction standard
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Gardner Denver DGH Series Heatless Desiccant Dryers were designed to help you meet your goals. Customizable
performance technology is integrated into our standard product so it can be tailored to benefit your specific critical
compressed air drying application. Now, you have the liberty to personalize the performance of the standard
product to adapt to your specific needs.
Variations in demand, pressure dew point, compressed air purity, and hours of operation
have often forced engineers to compromise energy efficiency and system performance for an “off-the-shelf” product.
Well…not anymore.
The DGH series offers three controller styles to meet every application.
Basic Controller:
The basic controller presents traditional heatless drying system.
Using a simple timer based controller, it offers a reliable fixed cycle operation.
Automatic time controlled bed regeneration cycles offer consistent performance.
The controller LEDs reflect: power on, left tower drying, right tower drying.
Standard Controller:
Four Dew Point choices from fixed cycle operating modes
Eight levels of Purge Air Energy Savings to match to your specific air demand profile
Controlled purge air shut-down when your air compressor unloads or is turned off
Energy Saving Controller:
Demand driven operating cycles to maximize your return-on-investment
Automatic Purge Air Control means exact matching to changing system load dynamics
Complete sensitivity to actual operating conditions minimizes your cost of operation
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DGH Series Heatless Desiccant Dryers open up a world of
customizable performance opportunities with four standard ISO
quality class levels of pressure dew points to choose from.
Don’t settle for less than the ability to satisfy all of your
requirements for clean, dry compressed air. Maybe you need
low dew point protection to prevent winter freeze-ups and are
satisfied with higher dew points the rest of the year. Simply
press the dew point selector button to select a new dew point
level that is best for you. The custom-built performance of the
DGH Series can be tailored to meet the most critical of
applications…yours.
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DGH Series Heatless Desiccant Dryers and FIL Series Filters provide “critical use”
applications of compressed air with a highly engineered quality air treatment system.
“Critical uses” of compressed air have zero tolerance for contaminants whose
presence will lead to manufactured product spoilage and rejection from a quality
assurance standpoint. A carefully engineered desiccant dryer design
provides a reliable method to remove moisture as a water vapor while
coalescing filters remove solid particles, liquid water droplets,
liquid oil and oil vapors from the compressed air system.
DGH Series Dryers offer Pressure Dew Points to -100°F (-73°C)
Moisture (water vapor) is present in ambient air as a gas and
cannot be filtered. Adsorbents present in the DGH Series remove
water vapor to prevent it from condensing into harmful liquid water droplets
inside compressed air systems. Microelectronic and pharmaceutical manufacturing are
examples which cannot tolerate the presence of any moisture.
FIL Grade E Series Coalescing Filters Remove Water Droplets and Solid Particles to 0.01 Micron
Water droplets are formed by the condensed water vapor present in ambient air. Solid particles
come from ambient air contaminants like dust and from rusted, oxidized pipework. They can cause
pneumatic equipment to malfunction and trigger instrument and control failures.
FIL Grade D Series Filters Remove Oil and Oil Vapors for Oil-Free Air
Liquid oil and oil vapors are introduced by compressor coolants and by hydrocarbon vapors present in ambient air. Oil-free
compressed air is particularly important in food and pharmaceutical processes where direct and indirect contact with
compressed air occurs. Oil contamination of food and drug products can generate significant liability issues and
manufacturing spoilage costs.
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How It Works
Moist, filtered compressed air enters the pressurized on-line desiccant
filled drying Tower 1 through the shiftmatic valve (A). Up-flow drying
enables the desiccant to strip the air stream of moisture. Clean, dry
compressed air exits through the shiftmatic valve (B) to feed the air
system. Tower 2 (when in regeneration mode) depressurizes to
atmosphere through muffler (C) when valve (D) opens. A portion of dry
compressed air (purge air) is diverted before exiting (B) and passes
through off-line Tower 2 and exits at valve (D) to desorb the moisture
from the desiccant. Once desorbed, valve (D) closes and Tower 2 is
repressurized. At tower shift-over, valve (E) will open, causing the
shiftmatic valve (A&B) to shift. Tower 2 will be placed on-line to dry the
bed. Operations will switch and Tower 1 will be regenerated.
Reliable valves are critical to dryer performance; that is why we use a
proprietary shuttle-style switching valve in lieu of off the shelf plug,
ball, butterfly, and diaphragm valves. The “Shiftmatic” is so reliable
that we offer a 5-year warranty on models DGH 40-3000 with use of a
properly sized FIL prefilter.
The shiftmatic valve has one moving part, no maintenance, no check
valves, aluminum housing and nylon shuttle.
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Basic Controller
The basic controller offers basic fixed cycle operation.
Power on LED
Left tower drying LED
Right tower drying LED
Standard Controller
The Standard Controller provides a wealth of features that allows you to personally
customize the dryer to meet the anticipated needs of your plant load. Purge
Optimizer can be programmed to extend the repressurization cycle and save purge air
at specific percentages of maximum load. You benefit from increased productivity
and reduced operating costs.
Standard DGH Series Controllers include:
Dew Point selections of -100°F, -40°F, -4°F, and +38°F operate from Fixed Mode regeneration cycles
Purge Air savings to 70% of full capacity to match up to your largest air demand
User programmable purge air shut-down capabilities can be synchronized to your air compressor
Switches for ISO Class dew point, On/Off, Alarm and Service reminder reset
LED lights that express power-on, valve status, and tower status
Normal or severe duty selectable LED lights that warn when service is due on filters, drains, valves and desiccant
RS-232 communication ports
Energy Saving Controller
The Optional Energy Saving Controller was engineered to continually adapt to everchanging
air demand profiles to assure you of the straightest path to a rapid Return-
On-Investment. Patented technology in Demand Mode senses the heat generated by
your actual plant load and automatically adapts the regeneration cycles to match those load changes.
The Energy Saving Controller is packed with features to further optimize the DGH Series with:
Maximum energy savings
Consistent Demand Mode dew point control of -40°F, -4°F, and +38°F (-100°F in Fixed Mode only)
Automatic Purge Air control
Exact load matching sensitivity to adapt to system variations
Alarm LED lights for tower switching failure, filter monitor signals, electronic demand drain alarms on filters
Vacuum fluorescent text display expresses percentage of energy saved in realtime, operating mode and service reminders
RS-232 communication ports
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Energy is consumed in the form of purge air to prepare the “off-line”
desiccant tower for its next cycle of operation by a process called
regeneration. You have the ability to optimize your purge air
consumption to achieve energy savings that will pay you dividends for
many years to come. The following describes variations in plant
operations that dictate which Controller selection may deliver your best
value.
Standard Purge Optimizer Savings:
Facilities operating at a constant level of air demand benefit the most
from the Purge Optimizer feature. Ordinary heatless dryer designs offer
zero purge air savings. The Purge Optimizer allows you to select purge
air savings of 10%, 20%, 30%, 40%, 50%, 60% or 70% of inverse
proportion to your air demand. For example, you can elect to save 30%
of your purge air costs if your maximum air demand is 70% of full rated
capacity; 40% savings at 60% load, 50% at 50% and so on. This feature
is invaluable if your maximum load levels remain fairly constant and you
are on a limited budget.
Optional Energy Saving Controller:
Events as transparent as lunch and coffee breaks represent energy saving opportunities that typically reflect 19% of every shift’s working
hours. Add in production changes and machine down time and there are more valleys than peaks on the demand chart. This patented
Controller uses thermistors to carefully monitor the natural temperature changes that occur during each drying and regeneration cycle.
The Controller acts on that data to precisely manage your system’s purge air needs. No intervention is required on your part. Maximum
energy efficiency is achieved. You save up to 84% on purge air energy costs…automatically.
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Gardner Denver FIL Series Filters complete the integrity of your critical use
air treatment system and are available in a variety of sizes and grades.
Compressed air quality and desiccant bed life are dependent on clean
compressed air. Compressed air must be prepared prior to entering
the desiccant dryer.
Normal installations could include an FIL Series Grade C (1 micron solid particles) prefilter followed
by an FIL Series Grade E or Grade F oil removal filter. Grade E (to 0.008 ppm) filters are used for ISO
8573.1 Class 2, 3 or 4 requirements. Grade F (0.0008 ppm) satisfies the needs of Class 1 pressure dew
points. An FIL Series Grade D (1 micron, reverse-flow) particulate filter is the right choice for installation
after the dryer to collect the fine desiccant dust and prevent it from migrating downstream. Then, if it is
technically oil-free air you need, complete the filter system with a Grade G Oil Vapor Removal Filter.
Operational Security with the ELEMENT MONITOR
Heightening the operational
security of your FIL Series Filters is
as simple as specifying you want
the optional Element Monitor
included with each filter you
order. Rely on your Gardner
Denver Distributor to assist you in
selecting the best combination to
satisfy your specific requirements.
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