Model(s): NDL 010, NDL 020, NDL 030, NDL 040, NDL 050
(1) NDL 010 to 050 have push to connect fittings on the inlet and outlet. All other models have NPT(F) threaded connections
(2) at inlet conditions of 100 psig and 100°F and a -40°F outlet pressure dew point. For all other conditions refer to the correction
(3) recommended for all applications. Required when dryer is to be installed immediately downstream of an oil lubricated
compressor. To order with a pre-filter add “-F” to the model number (i.e. NDL 120-F)
(4) per ISO 8573.1:2010 (E)
(5) NDL 010 to 050 are 232 psig MAWP as standard for USA; 101 psig MAWP for Canada. NDL 060 to 130 are 232 psig (MAWP) as
standard; NDL 2110 to 6130 are 145 psig MAWP as standard. Higher pressures available. All pneumatically controlled dryers
are 100 psig (MAWP)
➤Click Here for Pressure, Temp, & Dew Point Correction Factors Chart
Principles of operation
Heatless desiccant dryers are the most common due to their simplicity and hence low cost.
A heatless twin tower dryer (see figure opposite) operates by removing moisture through
adsorption onto a granular desiccant bed from the feed air (typically at 100 psig) as it flows
up through a packed bed of desiccant, column A. Column B (having been previously used in
drying the inlet air) is at atmospheric pressure and dry purge air from the outlet of column
A is fed through a purge valve, expanded to near atmospheric pressure, and flowed in
contra flow direction down through column B to effect the regeneration of its granular
desiccant bed. When the desiccant in column A becomes saturated with water vapor
(usually determined by a simple timer controller) the feed air is switched back to column B,
after it has been pressurised, and the cycle continues.
These advanced dryers use the pressure swing adsorption principle
to efficiently dry compressed air. They use a heatless twin tower
configuration housed in a modular design. Each
column contains a unique (and patented) desiccant cartridge which
incorporates an inlet water separator (D1 only) and outlet filtration.
Wet air from the compressor aftercooler enters the dryer and is directed
into column A. nano can provide F1 water separators and coalescing prefilters to ensure trouble-free operation for nano D-Series dryers.
Bulk liquids (water) and particles are removed by the separator on
the inlet of the cartridge. Water is retained within the dryer until the column
is regenerated, when it will be vented to atmosphere as it is depressurized.
Air passes through the desiccant bed where moisture vapor is
adsorbed. Then the dry air passes through a particle filter which retains
any desiccant particles (< 1 micron / ISO8573.1 class 2 for dust).
Simultaneously, a small amount of dry air is counter-flowed down through
cartridge B and exhausted to atmosphere, removing the moisture and
regenerating the desiccant.
The dryer is controlled by a PLC which periodically switches the solenoid
valves, reversing the function of each column and therefore ensuring the
continuous supply of dry air.
Energy Saving Dew Point Control Option
• with this option, a dew point sensor is incorporated into the dryer
providing the ultimate in energy savings
• the outlet dew point is constantly monitored allowing the cycle
time to be adjusted depending on the actual moisture load saving
valuable purge air
• easily field retrofit; includes dew point display
• the -ES option reduces valve actuation increasing service life and
includes an extended 5-year valve warranty
Floor or Wall Installation
• can be floor or wall mounted - simply by rotating the feet 90° (standard on D1, optional on D2)