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Why Urban Water Supply Systems Need Online Quality Monitoring
Delivering safe drinking water to urban populations requires more than just treatment at the waterworks. Water quality can change significantly as it travels through kilometers of distribution pipelines — residual chlorine dissipates, biofilm growth can occur, and pressure fluctuations may introduce contaminants at joints and connections.
Regulatory standards worldwide — including China's GB5749-2006 Standards for Drinking Water Safety, the urban water supply standard CJJ/T271-2017, and the T/WSJD10-2020 Online Monitoring Technical Code for Drinking Water Quality — now require continuous, real-time monitoring at multiple points across the distribution network.

The key parameters that must be monitored in urban water supply systems are:

Where to Install the KNF-400 — Recommended Deployment Points
Choosing the right installation location is the most critical step in building an effective urban water supply monitoring network. The KNF-400 is suitable for the following deployment scenarios:
1. Water Treatment Plant Outlet (Factory Outlet)
Monitor the quality of treated water leaving the plant before it enters the distribution network. Key parameters: turbidity, residual chlorine, pH.
2. Booster Pump Stations
Pump stations are high-risk points where pressure changes can disturb sediment and affect residual chlorine levels. Install the KNF-400 to verify water quality post-pump.
3. Pipeline Network Nodes (District Metering Areas)
Strategic nodes within the distribution network — especially at zone boundaries or long-dead-end branches — where chlorine decay is most likely. Provides early warning of quality degradation.

Step-by-Step Installation Guide for the KNF-400
Step 1 — Site Preparation
Before installation, confirm the following at the chosen location:

•Water supply: AC 100–240V power outlet available (or DC 12–24V for remote sites)
•Water connection: Inlet and outlet pipe connections available (standard pipe fittings compatible with KNF-400 water sampling ports)
•Drainage: A drain point is available for the system's automatic purge/blowdown water
•Communication: 4G signal coverage confirmed (for wireless cloud upload); or RS-485 cable run to local SCADA if wired connection is preferred
•Enclosure mounting: Wall space or pipe rack for cabinet mounting (KNF-400 uses standard wall-mount brackets)

Step 2 — Mechanical Installation
The KNF-400 features an integrated modular design with pre-plumbed internal pipework. Installation requires only three external pipe connections:

1.Water inlet connection — connect to the pressurized water supply pipe (recommended: install an upstream isolation valve and strainer/filter to protect the sensors from large particulates)
2.Water outlet / drain connection — connect to a drain or return line; the system continuously flows water through the measurement chamber
3.Flow rate setting — the built-in flowmeter can be set to 300–500 mL/min (recommended operating range); the system displays flow rate on the 7-inch touch screen for confirmation

⚠️ Important: The residual chlorine sensor requires a minimum flow rate of >400 mL/min for stable measurement. Ensure adequate supply pressure at the inlet.

Step 3 — Electrical Connections

1.Connect the AC 100–240V power supply to the cabinet's built-in terminal block (or DC 12–24V for solar/battery-powered remote sites)
2.If wired data output is required, connect the RS-485 cable (Modbus RTU protocol) to the local data logger or SCADA system
3.For wireless cloud upload, insert the 4G SIM card into the built-in wireless module — the system will automatically connect to the Kainafu cloud platform

Step 4 — Sensor Verification and System Start-Up

1.Power on the system — the 7-inch touch LCD display will illuminate and begin self-diagnostics
2.Allow water to flow through the system for 5–10 minutes to purge air and stabilize sensor readings
3.Verify that all parameter readings are displaying on the main screen (pH, turbidity, residual chlorine, temperature, TDS/conductivity)
4.Check that flow rate is within the 300–500 mL/min recommended range on the flowmeter display

Step 5 — Calibration
The KNF-400 sensors are factory-calibrated before shipment and can typically be deployed without immediate field calibration. However, for maximum accuracy upon commissioning:

•pH: Perform a 2-point or 3-point calibration using pH 4.01, 6.86, and 9.18 buffer solutions
•Turbidity: Verify against a Formazin standard solution if high precision is required
•Residual chlorine: Factory DPD calibration is already applied; field verification using a DPD colorimetric comparator is recommended at commissioning
•TDS / Conductivity: Single-point calibration using a certified conductivity standard solution

Step 6 — Cloud Platform Configuration

1.Log in to the Kainafu Water Quality Monitoring Cloud Platform at ion.onetestinc.com (or use the mobile APP — available for iOS and Android)
2.Register the device using the unit's serial number
3.Configure alarm thresholds for each parameter (e.g., turbidity >1 NTU, residual chlorine <0.05 mg/L, pH <6.5 or >8.5)
4.Set the data upload interval (adjustable; recommended: every 5–15 minutes for routine monitoring)
5.Enable WeChat binding for instant push notifications when alarm conditions are triggered
6.Optionally configure scheduled email reports with data tables for compliance record-keeping

Step 7 — Routine Maintenance
The KNF-400 is designed for minimal maintenance in unattended locations:

The KNF-400 includes an automatic sewage discharge device that purges accumulated sediment from the water sampling pipework — reducing manual cleaning requirements significantly.

Key Features of the KNF-400 at a Glance
•Compliant with GB5749-2006, CJJ/T271-2017, T/WSJD10-2020 — meets all major Chinese drinking water monitoring standards
•7-inch touch LCD display — real-time data, historical curves, and alarm records visible on-site
•Built-in data storage — 128 MB internal storage + USB export for compliance data tables
•4G wireless + RS-485 — flexible connectivity for any deployment scenario
•Cloud platform + WeChat + APP — remote monitoring, alarms, and data access from anywhere
•Flow statistics function — monitors water consumption to assist leak detection
•Optional water leak alarm — automatic inlet shutoff on leak detection
•No chemical reagents — safe for unattended operation, no secondary pollution
•ISO 9001 / ISO 14001 / CMA certified — verified measurement quality accepted by regulators
• Modular design — easy sensor replacement and system expansion in the field