Dayu Electronics Corrosion-Resistant Open Channel Flowmeter Level Monitoring Solution for Plastic Plant Discharge Outlets
Recently, multiple plastic manufacturing companies have reported that the open channel flowmeter probes used at their plant discharge outlets frequently suffer from corrosion and scaling, leading to measurement data drift and even equipment failure. One customer originally used a standard ultrasonic level transmitter probe with a Parshall flume, but after only 3 months of operation, the probe surface became pitted from corrosion and crystals fell off, causing level detection failure, which directly affected environmental data reporting and sewage fee accounting.
The wastewater discharged from plastic plants often contains acids, alkalis, or other chemically corrosive media. Ordinary engineering plastics or stainless steel probes exposed to such water bodies over time are prone to housing embrittlement and probe corrosion damage, leading to inaccurate measurements or even equipment failure. To address this pain point, our core solution is "material corrosion resistance + non-contact measurement".
Practicality of PVDF corrosion-resistant probes
We recommend upgrading the original standard probe to a corrosion-resistant material probe. Dayu Electronics' open channel flowmeters offer a variety of housing and probe material options. For highly corrosive conditions, we strongly recommend ultrasonic probes made of PVDF (polyvinylidene fluoride) or PTFE (polytetrafluoroethylene). PVDF and PTFE exhibit exceptional chemical inertness, capable of resisting attack from most acids, alkalis, salts, and organic solvents, making them perfectly suited for the complex water quality at plastic plant discharge outlets.
The ultrasonic probe is installed above the Parshall flume without direct contact with the wastewater. Combined with corrosion-resistant materials, this further eliminates the risk of contamination by sewage impurities and chemical corrosion, significantly reducing maintenance frequency and replacement costs.
System Configuration and Installation Optimization
Parshall flume adaptation: The Parshall flume itself is recommended to be made of fiberglass (unsaturated polyester composite) material, which has a smooth inner surface, corrosion resistance, and is less prone to scaling, forming a perfect "dual anti-corrosion" combination with the corrosion-resistant probe.
Installation details: During installation, ensure that the ultrasonic probe is positioned at 1/3 of the upstream converging section of the Parshall flume and aligned with the centerline of the flume. The probe bracket should be made of corrosion-resistant materials (such as 316 stainless steel or plastic) to prevent probe fall due to bracket corrosion and fracture. Additionally, the probe height should be approximately 40 cm above the maximum water level, ensuring that the measurement blind zone does not affect data while preventing violent water surface fluctuations or foam from directly contacting the probe.
With the PVDF corrosion-resistant probe, a service life of over 10 years can be achieved under normal operating conditions, and it remains stable for long periods in acidic and alkaline environments. For the special corrosive media at plastic plant discharge outlets, Dayu Electronics can provide customized Parshall flume and probe anti-corrosion solutions. For more detailed material comparisons or on-site selection support, please contact us. Using the right materials makes discharge monitoring more worry-free and longer-lasting.