Jiwei Ring‑11 Liquid Level Switch Wins Zhanjiang Green Water Project
Project Background: Tough Requirements in Zhanjiang Green Water Scheme
Liquid level switches played a critical role in the success of the Zhanjiang Green Water & Sludge Integrated Treatment Project, launched in May 2025 by Zhanjiang Municipal Investment Group and the Environmental Department. With an investment of approximately 720 million CNY and a daily treatment capacity exceeding 200,000 tons, the project demanded highly reliable and precise liquid level control solutions to ensure smooth and safe operation.
Tender specifications demanded:
- Liquid Level switches resilient to heavy foam, sludge, and corrosive conditions
- SIL2 or higher functional safety certification
- Seamless PLC compatibility (Siemens, Schneider)
- Submission of past-case proof, third-party test data, and real-life sample records
Submission & Shortlisting: Jiwei Stands Out
On May 28, 2025, Jiwei submitted:
- Technical whitepaper on tuning fork applications in sludge/settling tanks
- SIL2 certificate (Beijing Zhongren)
- 18-month fault-free record from Chengdu plant
- Demo units with foam-replication test
- Compliance docs: CE, RoHS, Ex d IIC T6 Gb
- Manuals, drawings, and maintenance plans
After three rounds of technical review, Jiwei was selected to supply 52 Ring‑11 liquid level switches for high/low level alarms in the clarifier and equalization tanks.
Why Jiwei Won: Technical Superiority Explained
- Foam-Tolerant, Maintenance-Free Detection
No moving parts, immune to foam, viscosity, and conductivity; ideal for sludge, activated sludge, and colloidal liquids. - Advanced Safety & Smart Output
- SIL2-certified under IEC 61508, optionally SIL3
- Supports NAMUR, relay, NPN, PNP outputs
- Integrates seamlessly with Siemens S7-1200, Schneider Modicon PLCs
- Fast response: ≤0.5s; minimal false alarms
- Built for Harsh Environments
- Custom probe lengths, threads, or flanges
- 316L stainless steel body with PTFE coating
- Operating temp: -40 to 400°C; IP67 rated
- Versions available: Hastelloy, corrosion-resistant, explosion-proof
Field Deployment: Three-Day Complete System Commissioning
On July 10, 2025, Jiwei’s team arrived at the West Port Wastewater Station (Potou, Zhanjiang). Installations included:
- Low-level protection for equalization tank
- High-level alarm for clarifier
- Overfill cutoff for sludge feed hopper
Within 3 days, they completed mounting, signal tests, SCADA interface, and operator training.
Real User Feedback: 30 Days with Zero False Alarms
Mr. Wang, Operations Lead:
“Foam issues were our worst problem. Jiwei’s switch gives precise alarms every time and needs no maintenance—impressive reliability.”
Ms. Huang, Automation Engineer:
“Signal wiring was almost plug-and-play with Modicon PLC. Setup of four units took just one hour. Very efficient.”
Operator Log (August 2025):
- 52 devices running flawlessly
- Alarm response <0.5s
- Zero false alarms or lag
- No cleaning or maintenance needed
Fast Delivery & Customization Advantage
- Delivered initial batch in just 5 working days
- Pre-shipment testing with liquid simulation
- Custom probe length, labeling for asset tracking
- Dedicated Wi‑Fi support and 24/7 hotline
Documentation & Compliance Submission
After commissioning, Jiwei submitted:
- Product certificates, SIL2 docs, wiring diagrams
- Commissioning logs, SCADA integration report
- Pre-run test report, risk assessment
- Installation photos, training attendance, signed feedback forms
Other Application References
- Chengdu 2nd Wastewater Plant (18-month stable operation)
- Wuxi WuXi AppTec chemical foam monitoring
- Middle East refinery interface alarm application
Conclusion: Proven in Tough Conditions, Trust Earned
Jiwei’s successful deployment in the Zhanjiang Water Project showcases domestic engineering reliability in tough environmental controls. The project embodies a milestone in “China-made instrumentation” leading high-standard infrastructure implementations.
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