Installing Water Quality Monitors for Secondary Supply

Proper installation of water quality monitors in secondary water supply systems (e.g., rooftop tanks or basement reservoirs) ensures safe drinking water. Follow these key steps:

1. Select Monitoring Points

Install sensors at outlets after pumps or storage tanks, and before distribution to users. Avoid dead ends or areas with stagnant water.

2. Prepare the Mounting Location

Use a bypass pipe loop with shut‑off valves for easy maintenance. Ensure the flow cell is vertical and water flows upward through sensors to eliminate air bubbles.

3. Mount the Sensors

Securely attach probes (pH, turbidity, residual chlorine, temperature) into the flow cell or directly into the pipeline using appropriate threaded fittings. Follow manufacturer torque specifications to avoid leakage.

4. Connect Sample Lines

For online analyzers, connect 6-10 mm PTFE or stainless steel tubing from the main pipeline to the instrument. Install a pressure regulator and flow control valve to maintain 0.5–2 L/min flow rate.

5. Wire the System

Connect sensor cables to the data logger/transmitter, shielding against electromagnetic interference. For 4–20 mA or RS‑485 outputs, verify polarity and termination. Provide a dedicated, grounded power supply (e.g., 24V DC).

6. Calibrate and Test

After installation, flush the system with clean water. Calibrate each sensor using standard solutions (e.g., buffer for pH, DPD kits for chlorine). Check for leaks and stable readings before putting into service.

7. Schedule Maintenance

Clean probes regularly according to water quality conditions. Recalibrate monthly and replace consumables (e.g., electrolyte, membranes) as recommended.

By following these steps, you ensure accurate, continuous monitoring of secondary water quality.