Reverse osmosis water treatment instrument monitoring application plan

Reverse osmosis water treatment instrument monitoring application plan

1. System overview‌

Reverse osmosis water treatment systems need to monitor key water quality parameters in real time to ensure the safety of membrane units, improve desalination efficiency, prevent scaling/pollution, and optimize operating costs. The plan covers the entire process of raw water pretreatment, RO membrane unit operation, produced water quality and concentrated water discharge.

2. Monitoring point configuration and instrument selection‌

‌1. Raw water inflow monitoring (before pretreatment)‌

·Monitoring parameters: pH, conductivity, turbidity, residual chlorine, temperature

· Instrument selection‌：

· pH meter‌：Monitor the pH value of raw water in real time to prevent corrosion or scaling (online corrosion-resistant pH sensor is recommended).

· Conductivity meter‌：Evaluate the ion concentration of raw water and provide a benchmark for subsequent desalination rate calculations.

· TurbidimeterDetermine the suspended matter content and judge the pretreatment effect (such as the efficiency of multimedia filter).

· Residual chlorine analyzer‌：Monitor the residual chlorine concentration (≤0.1ppm) to avoid oxidative damage to the RO membrane.

· Temperature sensorCompensate pH and conductivity measurements to optimize data accuracy.

‌2. Post-pretreatment water monitoring (before high-pressure pump)‌

· Monitoring parametersSDI (Pollution Index), Pressure, Flow

· Instrument selection

· Turbidimeter +SDI testerEnsure SDI≤5 to prevent membrane contamination (can be combined with an automatic sampling system).

· Electromagnetic flowmeterMonitor inlet water flow and link the start and stop of high-pressure pumps to avoid water hammer impact.

· Pressure transmitterCheck the pressure difference before and after the security filter to warn the filter element is blocked.

‌3. Key monitoring points of RO membrane group‌

· High-pressure pump outlet

· Pressure transmitterMonitor pump outlet pressure to prevent overpressure from damaging membrane components.

· RO membrane water inlet side

·Conductivity meter:The benchmark value of influent ion concentration is used to calculate the real-time desalination rate.

· pH meterControl the amount of scale inhibitor added (if acid adjustment is used).

· RO membrane water production side

· High-precision conductivity meter‌(Range of 0~20μS/cm): Monitor the purity of produced water and judge the attenuation of membrane performance.

· Total hardness/total basicity online analyzer:Early warning of the risk of calcium carbonate/calcium sulfate scaling.

· RO concentrated water side

·Electromagnetic flowmeter + pressure sensor: Calculate the system recovery rate (produced water flow/inlet water flow) and optimize water efficiency.

·Silicon dioxide online analyzer: Prevent silicate deposition (especially in high-salt water treatment scenarios).

‌4. Water production storage tanks/delivery pipes‌

· Monitoring parameters‌：pH, conductivity, dissolved oxygen, temperature

· Instrument selection

· Sanitary conductivity meterEnsure that the produced water meets process standards (such as ultrapure water conductivity ≤0.1μS/cm).

· Dissolved oxygen analyzerPrevent corrosion of rear pipes (suitable for boiler water supply and other scenarios).

‌3. Data integration and intelligent control‌

· PLC/SCADA systemIntegrate all instrument signals to achieve:

·Display water quality data and trend charts at each node in real time.

·Automatically trigger an alarm (such as residual chlorine exceeding the standard and desalination rate decreasing by 10%).

·Linkage dosing system (scale inhibitor, reducing agent) and flushing procedures.

· Communication protocolSupports 4-20mA, HART, Modbus RTU/TCP, and is compatible with mainstream control systems.

‌4. Maintenance and calibration services‌

· Regular calibrationConductivity meters and pH meters are calibrated monthly, and residual chlorine/silica analyzers are calibrated quarterly.

· Sensor maintenanceAutomatic cleaning of the turbidimeter, regular regeneration of the pH electrode, and zero-point correction of the flowmeter.

· Replacement of consumablesProvide one-stop consumable support such as membrane protection filter elements, reagent packs, and electrode kits.

‌5. Program advantages‌

· Accurate warningMulti-parameter collaborative analysis provides early warning of membrane pollution/scaling risks 24-48 hours in advance.

· Energy efficiency optimizationReduce energy consumption and chemical use through recovery and desalination data.

· Long life designThe instrument is IP65/IP68 protected, resistant to high pressure and corrosion, and adapted to harsh working conditions.

For customized solutions or technical demonstrations, please contactFESKS/FiskeinstrumentTeam of engineers!‌