RODI Aqualynx - Model 250 RO V2 -Reverse Osmosis Monitoring and Control System

• Two Temperature Compensated Conductivity Inputs with percent rejection and adjustable alarm setpoint
• Water Temperature Input with adjustable high temperature shutdown
• Pretreatment Interlock
• High Tank Level Shutdown
• Low Tank Level Restart
• Inlet Valve Control
• Chemical Pump or Feed Pump Control
• High Pressure Pump Control
• Low Feed Pressure Sensing
• High Membrane Pressure Sensing
• Flush Valve Control with adjustable flush interval and duration
• Permeate Diversion Valve Control
• Alarm Output​

The RODI Systems AquaLynx™ 250 ENC V2 is a compact data acquisition, monitoring, and control system designed specifically for commercial and light industrial RO applications. Utilizing the latest microprocessor technology, over four thousand variants of this controller have been deployed since 2001. The AquaLynx™ 250 ENC V2 is a "drop in" replacement for the MC10 RO controller originally used by US Filter, Siemens, and Evoqua.

The AquaLynx™ 250 ENC V2 RO Controller is equipped with the following inputs. Input connections are made via spring terminals.

• Two Conductivity Sensors: Two inputs are provided for two-electrode conductivity sensors on the RO feed and product. Sensors with cell constants of 0.01, 0.1, 1.0, or 10.0 may be used.  These cell constants provide a detection range of 1 uS/cm to 100,000 uS/cm. Only sensors with a 1000 ohm RTD will work with this controller.
• Four Pressure Sensors:  4-20 mA inputs for pressure sensors monitoring feed pressure, interstage pressure, reject pressure, and permeate pressure. Pressure sensor inputs may be disabled for systems without these sensors.
• Three Flow Sensors: Inputs for two sinking pulse flow sensors on any combination of feed, reject, or permeate along with one sinking pulse sensor for reject recycle. Flow sensor inputs may be disabled for systems without these sensors.
• Two Pressure Switches: Dry contact inputs for low pump suction and high pump discharge.
• Two Tank Level Switches: Dry contact inputs for high land low tank level switches.
• Pretreatment Interlock: Dry contact input that signals the system to shut down when a pretreatment device is not functioning or is regenerating.
• Pretreatment Failure: Dry contact input that signals the failure of the pretreatment system .

The AquaLynx™ 250 ENC V2 is equipped with the following outputs. The 24 VAC outputs are in the form of solid state triac outputs. Output connections are made via screw terminals.

• Inlet Solenoid: Energizes 15 seconds before the high pressure pump turns on, and de-energizes 15 seconds after the pump turns off.
• Auto Flush Valve: This output energizes during the flush cycle, thus opening the valve and allowing flow to bypass the reject control valve.
• Chemical Injection Pump: Energizes before the high pressure pump starts and de-energizes before the pump shuts down.
• High Pressure Pump: Powers the coil of the high pressure pump motor starter. This output is energized depending on other operating parameters.
• Permeate Diversion Valve: Energized when the percent salt rejection of the system is below the setpoint. This output is also energized during a flush.
• Alarm: Includes a 108 dB alarm horn mounted inside the AL250-V2 enclosure along with a dry contact relay for interfacing with other devices.

All 24 VAC outputs are protected by positive temperature coefficient resistors (polyfuses).

The AquaLynx™ 250 ENC V2 may be programmed with the following settings. All settings are easily changed from the keypad and are password protected.

• Alarm Setpoints, Deadbands, and Time Delays
• Permeate Diversion Setpoint, Deadband, and Time Delay
• Calibration Settings for Conductivity, Temperature, and Pressure
• Conductivity Range
• K Factors for Flow Sensors
• Enable/Disable for Tank Level Sensors, Pressure Sensors, and Flow Sensors
• Flow and Pressure Sensor Configuration
• Logic Settings Including:
  • Low Pressure Restart Delay
  • Tank or Direct Feed Selection
  • Tank Level Start Delay
  • Flush Interval
  • Flush Duration

The AquaLynx™ 250 ENC V2 logs all alarm events along with time-stamped conductivity, temperature, pressure, and flow data.

AquaLynx™ is a trademark of RODI Systems Corp.