FourFaith IoT
Measures residual hypochlorous acid (HClO) in water using the constant-voltage method; simultaneously records water temperature and automatically compensates for it; two-point calibration involving a chlorine-free water zero point and a standard solution slope; Modbus read/write of real-time residual chlorine and temperature data; allows modification of the device’s communication address and switching of the communication baud rate; supports temperature offset correction.
Cable lengths can be customised to be longer; the flow-through cell is included as standard in the kit
The F-IWQ1507 utilises a constant-voltage detection principle and features a built-in Pt100 temperature compensation unit. When paired with a dedicated flow-through cell, it enables continuous monitoring of residual chlorine in piped water.It features a standard Modbus RS485 digital output and is pre-calibrated at the factory; two-point calibration is required only in the event of a numerical offset. Suitable for controlling disinfection concentration in water bodies such as water supply systems and swimming pools, it reduces the need for frequent on-site calibration and ensures stable control of water disinfection parameters.
Adopts constant-potential electrode sensing structure for stable measurements, accurately reflecting the effective disinfectant hypochlorous acid (HClO) concentration in water.
Constructed with ABS/PC anti-corrosion alloy housing and IP68 fully sealed protection, suitable for long-term flow-through or submerged installation inside pipelines.
Comes with a dedicated flow cell to regulate flow velocity within 30~60 L/h, eliminating water flow interference and enhancing measuring precision.
Features standard 3/4 NPT thread; installation at an inclination ≥15° is allowed for compatibility with all types of water supply and circulating pipelines.
Supports standard Modbus RTU industrial bus, capable of connecting to global PLCs, RTUs and cloud monitoring platforms.
Ultra-low power consumption of only 0.2 W, ideal for long-term online monitoring at solar-powered field water supply stations.
Measuring range: 0~2 mg/L, matching regular disinfection concentration of drinking water and swimming pools, with resolution up to 0.001 mg/L.
Electrodes only require 24-hour soaking activation after factory delivery or long idle storage, pre-calibrated before shipment for effortless daily maintenance.
| Measurement parameters | Residual chlorine (HClO) in water, water temperature | Residual chlorine range | 0–2.000 mg/L |
|---|---|---|---|
| Residual chlorine accuracy | ±5% or ±0.05 mg/L (whichever is greater) | Residual chlorine resolution | 0.001 mg/L, minimum detection limit 0.05 mg/L |
| Temperature range | 5–50 °C, temperature measurement accuracy ±0.3 °C | Response time T90 | <90 s |
| Calibration method | Two-point calibration (zero and slope) | Interface type | 4-pin M16 shielded, waterproof aviation connector |
| Communication protocol | RS485 Modbus RTU, default 9600 8N1 | Power supply and power consumption | DC 12–24 V; total power consumption 0.2 W @ 12 V |
| Protection rating | IP68; pressure rating ≤ 0.2 MPa | Operating water conditions | water pH 4–9, water temperature 5–50 °C; storage temperature –5–65 °C |
Monitoring of residual chlorine in water supply networks of water treatment works, bottled water production lines, swimming pools, industrial cooling circulation water, and water treatment disinfection processes.
A Soak the sensor in tap water and leave it undisturbed for 24 hours to activate the electrode; proceed with calibration and measurement only after activation is complete.
A Zero calibration: Place the sensor in chlorine-free pure water and perform the calibration once the reading has stabilised;Slope calibration: Introduce a 1–2 mg/L standard residual chlorine solution into the flow-through cell; complete the calibration once the reading has stabilised.
A Position the sensor’s measuring end close to the inlet and away from the outlet; maintain a flow rate of 30–60 L/h; the entire unit must be tilted at an angle of ≥15°; horizontal or inverted installation is prohibited.
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