Sodium Hypochlorite Dosing Unit Instructions
1. Sodium hypochlorite dosing unit for adding sodium hypochlorite solution; safe and easy to operate.
2. Sodium hypochlorite dosing unit employs a metering pump, equipped with a back pressure valve at the pump outlet to prevent siphonage or backflow.
3. The import metering pump is equipped with a flushing facility. Before shutting down the metering pump, tap water is used to flush the metering pump's overflow system to prevent crystallization from forming inside the pump head upon shutdown.
4. The import of the metering pump is equipped with a filter and exhaust facilities to prevent insoluble matter in the sodium hypochlorite solution in the suction pipeline or bubbles produced by the decomposition of sodium hypochlorite from affecting the performance of the metering pump.
5. The sodium hypochlorite dosing unit is equipped with a flow dilution device, which dilutes the sodium hypochlorite solution to approximately 2000 PPM, effectively reducing the concentration of sodium hypochlorite at the dosing point from the metering pump, preventing crystallization or decomposition of sodium hypochlorite within the pipeline.
6. Automated Control
Sodium hypochlorite solution dosing unit features a PLC controller, with local display and control at the equipment site, and remote display and control at the control room. Both remote and local operation can achieve the same functions, with a touch screen display used for the monitor.
The controller features manual and automatic control switching. In manual mode, the chlorine dosage can be manually set. In automatic mode, the controller can accept 4-20mA flow signals (provided by the user) or 4-20mA free chlorine signals (provided by the user or optional free chlorine meter). The sodium hypochlorite dosing unit controller can automatically proportionally dose sodium hypochlorite based on the treated water flow rate, and can also adjust the dosage based on the residual chlorine level in the water after chlorination.
The controller features multiple redundant switch input terminals, which can be configured to implement alarm and shutdown protection functions for situations such as material shortages and water outages, as per user requirements.
