Challenges and Requirements of Liquid Level Monitoring in the Electroplating Industry

In the electroplating production process, liquid level monitoring of strong acid (such as sulfuric acid and hydrochloric acid) and strong alkali (such as sodium hydroxide) solutions has always been a technical challenge. Traditional stainless steel sensors are prone to corrosion in extreme pH environments, resulting in increased measurement errors and even equipment failure. Taking an electroplating plant as an example, the average service life of ordinary sensors used in its plating tank is only 3 months. Frequent replacement not only increases costs, but may also cause safety accidents due to monitoring failure.

The LHM-C3 anti-corrosion submersible level transmitter adopts an aluminum oxide ceramic sensing diaphragm, with a Mohs hardness of up to grade 9, and its acid and alkali resistance far exceeds that of 316L stainless steel. Actual test data show that after continuous operation for 2000 hours in a 40% concentration sulfuric acid solution, the sensor zero drift is still controlled within ±0.1%FS, and this indicator is significantly better than metal products such as the HD-136P high-temperature guided pressure type level transmitter.

Core Performance Comparison: Ceramic vs Metal Sensors

Three Major Application Scenarios of LHM-C3 in Electroplating Processes

1. Precise Liquid Level Control of Plating Tanks

After a certain auto parts manufacturer adopted the LHM-C3 ceramic anti-corrosion sensor to replace the original KC803 model, the following improvements were achieved:

• Measurement accuracy improved from ±1.5% to ±0.25%FS
• The temperature compensation range was extended to -20~150℃, adapting to heated plating solution conditions
• Certified with IP68 protection rating, allowing direct immersion installation in the solution

2. Reliable Monitoring of the Pickling Process

For the highly corrosive environment of hydrochloric acid pickling tanks, comparative tests between the LHM-C3 and the YM-LSYW anti-corrosion submersible level transmitter show:

1. In a 30% hydrochloric acid solution, the ceramic diaphragm of the LHM-C3 showed no signs of corrosion
2. Signal output stability improved by 60% compared with metal sensors
3. The built-in PT100 temperature sensor can simultaneously monitor changes in solution temperature

3. Liquid Level Interlocking in Wastewater Treatment Systems

When combined with the HPT603 anti-corrosion submersible level transmitter to form a dual-redundancy system, the LHM-C3 demonstrates the following in electroplating wastewater treatment:

• 4-20mA+HART dual communication protocol, compatible with existing PLC systems
• The ceramic diaphragm has outstanding anti-fouling capability for lead-containing wastewater
• Modular design supports quick replacement of damaged parts

Analysis of Key Indicators for Technical Evaluation

For similar products such as DMU09 and PT801Z, technical evaluation personnel should focus on the following parameters:

Materials Science Dimension

The LHM-C3 uses α-Al₂O₃ ceramic prepared by reaction sintering, with grain size controlled below 0.5μm and density >99.6%. Compared with the metal material used in the WJ2088T anti-corrosion submersible level transmitter, it has the following advantages:

• Ion permeability reduced by two orders of magnitude
• Surface energy as low as 30mN/m, making it less likely to attract sediment
• Thermal expansion coefficient matches the platinum electrode, reducing thermal stress

Electrical Performance Comparison

Implementation Case: A PCB Electroplating Line Retrofit Project

In a project for a circuit board manufacturing enterprise in Shenzhen, we used the LHM-C3 to replace the original SLDTB-802GW high-temperature guided pressure type level transmitter, achieving the following results:

• Equipment failure rate reduced from 2.3 times per month to 0.2 times
• Plating thickness uniformity improved by 18%
• Annual maintenance costs reduced by 127,000 yuan
• Passed the ISO 14001 environmental management system certification audit

Summary and Selection Recommendations

For highly corrosive working conditions in the electroplating industry, the LHM-C3 ceramic anti-corrosion sensor is significantly superior to traditional metal sensors in terms of long-term stability, measurement accuracy, and total cost of ownership. Technical evaluation personnel should pay special attention to the following when selecting a model:

1. Verify the durability data of the sensor under specific acid and alkali concentrations
2. Consider the impact of temperature compensation accuracy on process control
3. Evaluate the compatibility of the signal transmission method with the existing system

As a national high-tech enterprise, Xi'an Shenghongchuang Instrumentation Co., Ltd. has all products certified to SIL2 functional safety standards. If you need to obtain the performance verification report of the LHM-C3 under your specific working conditions, or require comparative test data with models such as HD-136P and KC803, please contact our technical consulting team immediately.