NRO 2540 Series

​The NRO 2540 Series is designed for Commercial or Light Industrial applications requiring flow rates of 700-1400 gallons per day (GPD). The NRO 2540 Series features the durability of a powder coated steel frame, stainless steel pressure vessels, liquid filled panel mounted pressure gauges, and a rotary vane pump with a mounting bracket system that is easily removed for maintenance by one person.

Features & Benefits

  • ​Powder Coated Frame card icon
    ​Powder Coated Frame

    ​A carbon steel frame for strength & rigidity is powder coated for long life & durability.

  • Procon Rotary Vane Pumps card icon
    Procon Rotary Vane Pumps

    ​PROCON Positive Displacement Rotary Vane Pump, known as a carbonator pump, is designed and built to meet your needs for flow rates ranging from 115 to 330 gallons per hour at 250 psi.

  • Stainless Steel Membrane Housings card icon
    Stainless Steel Membrane Housings

    ​2.5" diameter by 40" length stainless steel membrane housing, 300 psi.

  • High Flow TFC Low Pressure Membranes card icon
    High Flow TFC Low Pressure Membranes

    High rejection membranes designed to perform at a lower pressure than standard membranes, which results in energy savings. Additional element types & ratings available. ​

  • High Flow 5 Micron Front Mounted Prefilter for Ease of Service
  • Float Switch & Pretreatment Interlocks - Standard on all Systems
  • Pump Throttle Valve & Pipe Mounted Discharge Pressure Gauge for Multi-Stage Booster Pumps
  • Panel Mounted Concentrate Pressure Gauge
  • Glycerin Filled Gauges for Accurate & Steady Pressure Readings
  • Permeate And Concentrate Flow Meters
  • Low Pressure Mechanical Switch w/Time Delay Snubber Valve
  • Integrated Recycle Valve
  • High Quality Stainless Steel Membrane Housings
  • High Flow TFC Low Pressure Membranes - Additional Element Types & Ratings Available
  • Brass or Stainless Steel Inlet Shut Off Valve
  • Quick Connect Fittings on Gauges & Recycle Operation for Ease of Service
  • Replaceable Quick Connect Fittings for Ease of Field Repairs
  • Quick Connect Fittings on Rotary Vane Pumps
  • Replaceable Motor Mounting System - makes field repairs easy, bracket mounts to motor and slides over frame
  • Extended Frame Legs with Plastic End Caps for Protection from Ground Contact and Ease of Movement
  • Powder Coated Frame for Long Life & Durability
  • Carbon Steel Frame for Strength & Rigidity

Additional Resources

Optional Equipment
  • Nelsen Repressurization System

    ​Repressurization Systems - pre-plumbed and ready to use when you receive them. These systems are custom built to your specific application. Included in the plumbing package 1" inlet threaded bulkhead fitting, float switch with 20 foot cord, 1/2" overflow threaded bulkhead fitting w/plug and 1" bulkhead fitting at bottom of tank w/1" foot valve. All plumbing is pre-installed in your choice of storage tank size.

  • Custom Graphics

    ​Custom Graphics - Use your logo or brand name to upgrade the appearance of your systems and strengthen your brand. Or, add value for your customers by providing custom branding.

  • Bladder Tank

    ​Bladder Tank Control - used to charge a pressurized bladder tank instead of atmospheric storage. Used when smaller quantities of RO water is needed. Storage is restricted by pressure tank size. All controls and components are included to pressurize the bladder tank including check valve and pressure switch.

  • Permeate Flush

    ​Permeate Flush - uses the RO permeate water for flushing foulants from the system. Soaking the RO elements during standby with permeate can help dissolve scale and loosen precipitates, reducing the frequency of chemical cleaning.

  • Wall Mount NRO

    ​Wall Mount Frame is easily mounted to walls when floor space is limited.

  • Chip RO Controller

    The Chip Control Box is an economical option for a RO controller available for both the SIMPLX and NRO-440 systems up to 4 membranes. The smaller modular design allows for easier assembly, service and flexibility with a clean and logical layout. It features 6 LED lights to indicate system operation of the RO Unit. The controller removes the need for a low pressure switch to control the pump and a start delay to prevent system cycling. A switching power supply operates on 96-264VAC, automatically adjusting to operating voltage. Voltage at the supply terminals is the voltage for the pump and valves. The controller allows for tank level, system flushing.

  • NRO Controller

    ​​Digital Display Electronic Control Box - The RO Control Box controls all the functions of the RO system. It also incorporates a TDS monitor as well as feed water temperature. It also controls the timing sequences of the solenoids and low pressure switch, which are impossible to control mechanically. In addition it gives a time delay for motor start and controls the float switches. It also controls higher functions such as the fast flush or permeate flush when ordered with the system. The Control Box has four different switchable programs installed. Custom controller programming is available to each customers preference as well as custom graphics.

  • Stainless Centrifugal Pump

    Stainless Steel High Pressure Centrifugal Pump for Lasting Performance (1400 gpd only)

NRO2540 Systems Specifications


Model TypeFloor StandFloor StandWall MountWall Mount
Model NumberNRO-F-12540S-700-1NRO-F-22540S-1400-1NRO-W-12540S-700-1NRO-W-22540S-1400-1
Production GPD70014007001400
Membrane2-1/2" x 40" (1)2-1/2" x 40" (2)2-1/2" x 40" (1)2-1/2" x 40" (2)
Permeate GPM.48GPM.97GPM.48GPM.97GPM
Feed GPM1.721.72
% Recovery w/Recycle19-40%30-60%19-40%30-60%
Pump.5 HP.75 HP.5 HP.75 HP
FLA 60HZ 1Ø110/2207.1/3.410/5.07.1/3.4
Circuit Size20/10A20/10A20/10A20/10A
Solenoid Voltage110v110v110v110v
Inlet3/4"3/4"3/4"3/4"
Permeate3/8"3/8"3/8"3/8"
Concentrate3/8"3/8"3/8"3/8"
Shipping Dims (DxWxH)34"x25½"x58"34"x25½"x58"48"x40¾"x29¼" 48"x40¾"x29¼" ​
Weight - Pounds104 lbs.118 lbs.106 lbs.120 lbs.
Max Operating Pressure160 psi160 psi161 psi162 psi

The stated product performance is based on data taken after 30 minutes of operation at the following test conditions:  2,000 mg/L NaCl solution at 225 psig ( 1.5 MPa) applied pressure, 15% recovery, 77o F (25o C), pH 6.5–7.0. Minimum pressure of 35psi dynamic.

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