In the field of liquid level monitoring for corrosive media such as strong acids and strong alkalis, the DH712 ceramic anti-corrosion level sensor has become the first choice for chemical enterprises by virtue of its outstanding performance. This article provides an in-depth analysis of 5 key purchasing parameters, including material corrosion resistance grade, measurement accuracy, and pressure range, to help you accurately select anti-corrosive submersible level transmitters such as the HHY700 and ZC-185 series, and solve liquid level monitoring challenges in chemical production.

In the chemical production process, liquid level monitoring is a key link in ensuring production safety and efficiency. However, corrosive media such as strong acids and strong alkalis pose severe challenges to traditional level sensors. As a professional high-tech enterprise, Xi'an Shenghongchuang Instrument Co., Ltd. has developed the DH712 ceramic anti-corrosion level sensor series, which has become the preferred solution for liquid level monitoring in chemical enterprises thanks to its excellent corrosion resistance and precise measurement capabilities.

1. Material corrosion resistance grade: the core indicator for ensuring long-term stable operation

In corrosive media environments, the material selection of the sensor directly determines its service life and measurement accuracy. The DH712 ceramic anti-corrosion level sensor uses special alumina ceramic as the key material in contact with the medium, and its corrosion resistance far exceeds that of ordinary stainless steel. According to ASTM C657 standard testing, the annual corrosion rate of this ceramic material is less than 0.01mm in highly corrosive media such as 98% concentrated sulfuric acid and 40% sodium hydroxide.

In practical applications, products in the HHY700 and ZC-185 series all adopt a multi-layer protective structure design:

• First layer: 99.6% high-purity alumina ceramic diaphragm
• Second layer: PTFE sealing isolation layer
• Third layer: 316L stainless steel mechanical protective layer

This composite protective structure enables the sensor to maintain stable operation even in extreme environments with a pH value of 0-14, making it particularly suitable for highly corrosive working conditions such as the chlor-alkali industry and electroplating production lines.

2. Measurement accuracy: a key parameter affecting production control

Chemical production has extremely high requirements for liquid level measurement accuracy, and even small errors may lead to ratio imbalance or safety accidents. The DH712 series sensors adopt advanced ceramic capacitive technology and high-precision signal processing circuits, achieving a measurement accuracy of ±0.1%FS, which is far higher than the industry standard of ±0.5%FS.

Comparison of accuracy performance for different models:

It is worth noting that the SSM-P220FS model is also equipped with a temperature compensation function, which can maintain measurement stability under ambient temperature fluctuations from -20℃ to 80℃, making it particularly suitable for winter working conditions in northern regions.

3. Pressure range: an important consideration for matching different working conditions

Pressure conditions in chemical production vary significantly, from atmospheric storage tanks to high-pressure reactors, placing different requirements on the pressure-bearing capacity of sensors. The EVT300B model adopts a specially designed ceramic diaphragm structure, which can withstand a working pressure of up to 6MPa while maintaining excellent corrosion resistance.

Pressure parameter selection guide:

1. Atmospheric storage tank（0-0.1MPa）: YM-BCYW basic model recommended
2. Medium-pressure reactor（0.1-2.5MPa）: choose the LMK809-396 series
3. High-pressure pipeline（2.5-6MPa）: use the EVT300B professional model

Xi'an Shenghongchuang's engineering team recommends that when purchasing models such as YM-QYYW, 1.5 times the actual working pressure should be considered as a safety margin to ensure long-term reliability.

4. Output signal and system compatibility

The automation control systems of modern chemical enterprises have strict requirements for sensor signal output. The DH712 series provides a variety of signal output options, including 4-20mA, 0-10V, and RS485, and can be seamlessly connected to control systems such as DCS and PLC.

Recommendations for signal type selection:

• Long-distance transmission（＞100m）: 4-20mA current signal preferred
• Multi-node networking: choose RS485 digital signal
• High-precision requirements: use HART protocol communication

It is particularly worth mentioning that the PTJ302 model supports the Modbus RTU protocol and can be directly connected to industrial IoT platforms for remote monitoring and data analysis.

5. Protection rating and installation method

Factors such as dust and moisture in chemical environments pose challenges to the external protection of sensors. The CL192 model reaches an IP68 protection rating and can operate continuously underwater at a depth of 5 meters for 30 days without leakage, fully meeting the requirements of humid environments such as wastewater treatment.

Reference for installation method selection:

Summary and professional recommendations

Selecting a suitable anti-corrosion level sensor requires comprehensive consideration of five key parameters: corrosion resistance grade, measurement accuracy, pressure range, signal output, and protection rating. As a leading professional manufacturer of pressure sensors and level transmitters in the industry, Xi'an Shenghongchuang Instrument Co., Ltd. has successfully applied its DH712, HHY700, ZC-185, and other series products in hundreds of chemical enterprises, accumulating rich practical experience.

Our technical team can provide you with:

• Free working condition analysis and model selection service
• Customized protection solutions
• Three-year warranty and lifetime technical support

Contact our engineering team now to obtain professional model selection recommendations and technical solutions tailored to your specific working conditions, making your liquid level monitoring system safer and more reliable.