Corrosion-resistant level measuring instrument

Application Overview  
    China is rich in groundwater reserves, which is the main source of water for human production and life in many areas. However, due to China's large population, huge differences in the spatiotemporal distribution of water resources, coupled with huge waste and pollution in actual water use, the usable amount of groundwater has been severely reduced, causing many practical problems such as ground subsidence and lake drying. This requires strengthening the monitoring of groundwater in order to guide the rational use of water by humans.

System Overview  
    The WH312 corrosion-resistant level measuring instrument is specially designed for continuous level measurement of wastewater or various corrosive media. Its basic component is a corrosion-resistant capacitive ceramic sensor. With reasonable and precise structural design and thick film technology, it performs temperature compensation and V/I conversion. The polytetrafluoroethylene shell is fully sealed, and the polytetrafluoroethylene cable with a vent pipe makes the sensor back pressure cavity communicate with the atmosphere, thus forming a 4-20mA or 0-10V signal output industrial standard product with stable and reliable performance. The basic component ceramic sensor of the WH312 corrosion-resistant special level meter is flush-mounted for easy cleaning of media contaminants adhering to the sensor diaphragm. To meet the needs of industrial wastewater media viscosity compatibility to the greatest extent.

Application Challenges:  
    1. Harsh on-site environment, high requirements for instrument stability; 
    2. Complex operating conditions, requiring stable product performance and high measurement accuracy of on-site instruments; 
    3. Complete product certification requirements; 
    4. Instruments that are easy to operate and install are needed to reduce maintenance costs.

Solution Advantages:  
    1. Realize production automation, real-time monitoring of production data, timely early warning and alarm; 
    2. High precision, corrosion resistance, strong stability, using titanium alloy or polytetrafluoroethylene material; 
    3. The product supports third-party metrological identification, the error is better than 0.009mA, and meets CE and RoHS certification standards; 
    4. Realized remote monitoring of parameters such as pressure, level, and temperature, reducing manual maintenance costs and improving personnel safety; 
    5. Provides an intelligent solution for recording level signals. 
 

I. Specific Requirements

       Demand unit: Guizhou Provincial Bureau of Geology and Minerals

    Operating environment: 3 salt wells, 300 meters deep wells, the medium is brine and other corrosive media. Various products with different principles have been used before, and basically they cannot work normally in 2-3 months. High-performance products with corrosion resistance are required.  
    Monitoring requirements: Long-term automated monitoring, improve office efficiency, and reduce manpower input;  
    Ensure the accuracy, timeliness, and effectiveness of the data;  
    Ensure long-term operation in a highly corrosive environment 300 meters underwater.

II. Operating Condition Assessment:

    In view of the above comparison, Wanhe engineers have given a new design:  
       New WH312 deep well corrosion-resistant level sensor：  
    1. Material: For deep wells with more than 300 meters of saltwater brine, titanium alloy sensors are used. The titanium alloy shell solves the sealing problem of 300 meters underwater, and the outer layer is wrapped with polytetrafluoroethylene material to solve the problem of corrosion resistance;  
    2. The integrated structure design of the WH312 deep well corrosion-resistant special sensor probe ensures normal operation underwater at 1000 meters and passes the 20MPa waterproof test (equivalent to 2000 meters underwater waterproof);  
    3. The signal transmission uses high-strength polytetrafluoroethylene cable (during the release process, pay attention to the protection of the cable) to ensure real-time, high-precision and stable output of the measured signal;

III. Scheme Design Principle Diagram and Installation Instructions

       Installation Steps:  
       1. Place the WH312 deep well corrosion-resistant level probe directly to the bottom of the 300-meter deep well. During the placement process, it can go down with the deep well pump (generally, the level probe is placed 3-5 meters above the deep well pump). During the well descent process, protect the polytetrafluoroethylene steel wire cable (if the cable is damaged, there will be no output signal).

       2. The red wire of the WH312 deep well level probe is connected to terminal 16, the green wire is connected to terminal 14, and terminals 23 and 24 are connected to a 220V power supply (24V power supply can also be selected, using battery power supply), then the display will show the current real-time deep well level depth. It has built-in high and low level alarms, and the normally closed point of the low level alarm and the intermediate relay controlling the deep well pump can form a loop, which can achieve the function of low level pump stop, protect the deep well pump, and prevent idling and burning.

IV. On-site Construction Drawings  
 

V. Product Real Shots

VI. Product Certification (For detailed certification information, please visit: www.whsensors.com)

    1. Inspection and Certification Group Inspection Report 
    2. CE FCC Certification 
    3. RoHS Certification 
    4. SGS Third-Party Calibration Certificate 
       5. Shenzhen Metrology Institute 0.25-level calibration certificate

VII. Product List