Heatless Desiccant Air Dryers – PTW Series

PTW Series Heatless Regenerative Desiccant Dryers are ideal for critical, high quality, oil free air treatment applications where very dry air is required. These dryers typically provide pressure dew points of -40°F (-40°C) down to -100°F (-73°C) pressure dew point (pdp). Beneficially, a pressure dew point of -15°F (-26°C) or better will not only prevent corrosion, but will also inhibit microorganisms within the compressed air system Heatless adsorption or desiccant dryers remove moisture by passing air over a regenerative adsorbent material which strips moisture from the air. This process is known as Pressure Swing Adsorption.

Dryer of this type are extremely efficient and provide typical pressure dew points of -40°F (-40°C) or -100°F (-73°C) pdp. This means that for water vapor to condensate into a liquid, the air temperature would have to drop below -40°F (-40°C) to -100°F (-73°C) respectively. Note that the actual air temperature after an adsorption dryer is not the same as it’s dew point. The desiccant material is contained in two separate but identical pressure vessels commonly referred to as “twin” towers. As the saturated compressed air flows up through the “on line” tower, its moisture content adheres to the surface of the desiccant. The dry compressed air is then discharged from the chamber into the distribution system. An onboard solid state controller automatically cycles the flow of compressed air between the towers. While the “on line” tower is drying, the “off line” tower is regenerating. Regeneration, sometimes referred to as purging, is the process by which moisture accumulated during the “on line” cycle is stripped away during the “off line” cycle. As low pressure dry purge air flows gently through the regenerating bed, it attracts the moisture that had accumulated on the surface of the desiccant during the drying cycle and exhausts that moisture laden air to atmosphere.

Functions:

• Mounting: structural steel base
• Mounting: 1/2″ | 3/4″ | 1″ | 1-1/2″| 2″
• Primary Voltage: 120V/1ph/60Hz
• Flow SCFM: 25 to 800
• Flow m³/min: .70 to 22.65
• Approximate Purge: 15%
• Maximum inlet or ambient air temperature: 120°F or 49°C
• Maximum Pressure: 150 psig or 10.5 bar
• Minimum Pressure: 50 psig or 3.5 bar
• Certifications NEMA 4; All NEMA classifications available as options
• Dew point Range: -40 to -100°F or -40 to -70°C
• Features Particulate and Coalescing pre-filters. After-filter included; solid state controller; CycleLoc™ demand control; variable cycle control (models PTW75 – PTW800 SCFM); purge flow indicator; purge flow regulator (models PTW75 -TW800 SCFM) repressurization circuit (models PTW75 – PTW800 SCFM) NEMA 4 controls; 150 psig design standard; moisture indicator (models PTW75 – PTW800 SCFM)
• Weight: 156 to 2120lbs or 71 to 962kg
• Options/accessories DDS Light / DDS (dew point dependent switching); 4-20 mA output; all NEMA classifications pressure to 1,000 PSIG; high humidity alarm; fail to switch alarm; electronic drain systems; contacts for remote alarms; NEMA 4 controls

Mini Disposable Inline Desiccant Dryers – DD10 Series

The DD10 Series mini disposable inline desiccant dryer is used at the point-of-use. This disposable, mini inline desiccant dryer removes all traces of water vapor, oil vapor and particulate. It is often used directly upstream of blow guns or spray guns as final protection for critical parts blow off and paint spraying. These compact inline desiccant dryers are a convenient and cost effective means of ensuring your sensitive intermittent pneumatic applications are not exposed to damaging moisture. As wet air enters through the inlet, the air travels down through a bed of desiccant, which absorbs the water vapor and aerosols. The silica gel desiccant beads will reduce the humidity down to a -40°F ( -40°C) pressure dew point.

A built-in 40 micron porous bronze element removes fine particulate, oil removing media removes oil vapor, and desiccant beads absorb water vapor. The see-through housing shows desiccant color change from the original blue to a pink color in the desiccant beads, which indicates that the dryer needs to be replaced. When installing the DD10, hand tighten to a leak proof seal. Do not use any mechanical means to hold the unit and do not over torque the threads in order to prevent damage or cracking.

• Dryer Type: Inline Desiccant
• Body Material: Polycarbonate
• Port Type: NPT
• Port Size: 1/4″
• Maximum Flow Capacity (SCFM): 15
• Operating Pressure Range: 0 to 125 / 0 to 8.6 bar
• Operating Temperature Range: 32° to 180°F / 0° to 54°C
• Dew Point: -40°F or -40°C
• Desiccant Type: Silica Gel
• Desiccant Capacity (lbs.): Disposable
• Filter Element (μm): 40
• Weight Full: 0.175 lb / 0.08 kg

Refrigeration Dryer Series – PRD325-PRD2400 (325-2400 SCFM)

PRD Series refrigeration air dryers Ideal for general purpose oil free pneumatic air treatment applications. They typically provide pressure dew points of 35°F (1.7°C) to 50°F (10°C) pressure dew point (pdp). Refrigeration air dryers work by cooling the air, so are limited to positive pressure dew point ratings to prevent freezing of the condensed liquid. Refrigeration dryers use a set of heat exchangers or a single heat exchanger (with chambers) first to pre-cool the air; second to refrigerate the air to condense out moisture vapor; and last to re-heat the air to prevent pipe sweating downstream particularly in humid conditions.

Non-Cycling (Direct Expansion) dryers are a type of dryer where the compressed air and the refrigerant come into direct contact via the heat exchanger. While reliable and simple to use, they generally require that the unit continues to run regardless of actual compressed air flow through the dryer. Cycling dryers that utilize a thermal mass as the means to absorb the heat from the compressed air. By chilling a thermal mass, a refrigerant compressor may turn off in times of low demand thereby saving energy by shutting off the refrigerant compressor.

Functions:

• Pipe Size (in.): 2 NPT-F | 3 NPT-M | 4 Flange | 6 Flange
• Primary Voltage (V): 230 | 460
• Flow SCFM 325 to 2400
• Flow m³/hr. 552 to 4078
• Ambient Temperature Range: 41° to 122°F or 5° to 50°C
• Maximum Inlet Temperature: 140°F or 60°C
• Maximum Pressure (psig): 203 (325 – 2400 SCFM)
• Maximum Pressure (bar): 14 (552 – 4078 m³/hr. )
• Pressure drop (psi) @ rated flow Less than 5
• Pressure drop (bar) @ rated flow Less than .35
• Refrigerant: R407C
• Weight: 320 to 1521lb or 145 to 690kg
• Features Cycling (SmartSave) control; SmartPack heat exchanger; SmartControl micro processor controller; Energy efficient scroll compressor; SmartDrain dual mode zero air loss drain