What are the differences between different models of RK500-12 pH sensors

Introduction  

The RK500-12 pH Sensor, a high-performance PH probe independently developed by Hunan Rika Electronic Tech Co., Ltd., is a core device for Water quality pH monitoring. It is designed to continuously measure pH values in various water bodies, including wastewater, industrial water, and natural water, with the advantages of no need for professional calibration instruments, simple operation, and strong reliability.

Covering application scenarios such as agriculture, sewage treatment plants, chemical industry, printing and dyeing, papermaking, pharmaceuticals, electroplating, and environmental protection, this series provides Various pH sensors options (A1, A2, B1-B3, C1-C3, D1-D3) to meet the needs of different water quality environments and installation conditions. Whether it is conventional water quality detection or special environments with high temperature, high pressure, or strong pollution, there is a corresponding model to ensure stable and accurate measurement.

What are the differences between different models of RK500-12 pH sensors?  

The RK500-12 series achieves precise adaptation to diverse application scenarios through rational differentiation in installation structure, material selection, environmental adaptability, and connection methods. Each model has unique characteristics, and the specific differences are as follows:  

1. Installation Structure and Fixation Mode  

   The installation structure directly determines the applicable installation scenarios of the PH probe, and the RK500-12 series is divided into four types according to this feature:  

   - A1/A2: Adopt a "small immersion type" design with direct cable connection. This structure is lightweight and compact, making it easy to immerse in water bodies such as pools and tanks. It is suitable for scenarios where there is no strict requirement for fixing positions, such as temporary sampling detection of nutrient solution or conventional sewage.  

   - B1-B3: Use PG13.5 thread for installation and match with M8 waterproof connectors. The threaded structure ensures stable fixation, which can be firmly installed on pipeline walls or equipment brackets. It is suitable for long-term fixed-point monitoring, such as continuous detection of industrial water pipelines.  

   - C1-C3: Adopt "upper and lower NPT3/4 thread" design with direct cable connection. The double-thread structure enhances installation stability, and it is often used in occasions that require close fit with pipelines, such as embedded installation in water supply pipelines or sewage treatment channels.  

2. Material Combination and High-Temperature Resistance

   Material selection is closely related to the sensor's resistance to temperature, corrosion, and pressure. The RK500-12 series uses different material combinations for different models:  

   - A1, A2, B1, B2, D1, D2: The main materials are PC+ABS, Glass+PC+ABS, or Glass+ABS. These materials have good corrosion resistance and are suitable for conventional water (such as river water), industrial water, and seawater, but they are not resistant to high temperatures above 80°C.  

   - B3, C3, D3: As high-temperature resistant models, they use special materials: B3 adopts Glass+316L, and C3/D3 uses Glass+PPS. These materials can withstand high temperatures up to 100°C, making them applicable to high-temperature occasions such as high-temperature industrial wastewater discharge ports or thermal water detection.  

3. Operating Temperature and Pressure Range  

   Due to differences in materials and structural design, each model has obvious differences in applicable temperature and pressure ranges:  

   - Temperature adaptation:  

     - A1, B1, C1, D1: The operating temperature range is 0-60°C, which is suitable for normal temperature water bodies such as ordinary sewage and nutrient solution.  

     - A2, B2, C2, D2: Can work in the range of 0-80°C, applicable to slightly high-temperature water bodies such as industrial circulating water (not exceeding 80°C).  

     - B3, C3, D3: The maximum operating temperature can reach 100°C, specially designed for high-temperature water quality monitoring.  

   - Pressure bearing capacity:  

     - A1, B1, C1, D1: The working pressure is 0.6Mpa, which is suitable for low-pressure environments such as open water pools or low-pressure pipelines.  

     - A2, B2, C2, D2: The working pressure is 0.8Mpa (A2/B2) or 1Mpa (C2/D2), applicable to medium-pressure pipelines such as industrial water supply pipelines.  

     - B3, C3, D3: The working pressure reaches 1Mpa, which can meet the pressure requirements of high-temperature and high-pressure pipelines such as chemical wastewater discharge pipelines.  

4. Electrical Connection and Waterproof Performance  

   The electrical connection method affects the sensor's installation convenience and waterproof reliability, which is crucial for outdoor or underwater use:  

   - A1, A2, C1, C2, C3: Use direct cable connection. This method is simple and low-cost but requires careful protection of the cable connection to avoid water seepage in humid environments.  

   - B1, B2, B3: Equipped with M8 waterproof connectors. The connector design makes installation and disassembly more convenient, and the waterproof level is improved, which is suitable for outdoor fixed installation.  

   - D1, D2, D3: Adopt M16 waterproof connectors. Compared with M8 connectors, M16 has a larger size and better sealing performance, which can adapt to more harsh waterproof environments, such as long-term underwater immersion or heavy rainfall areas.  

5. Target Application Scenarios  

   The differences in the above aspects finally determine the applicable scenarios of each model, making Water quality pH monitoring more targeted:  

   - A1, B1, C1, D1: Suitable for conventional water bodies with normal temperature and pressure, such as river water, ordinary sewage, and nutrient solution in agricultural greenhouses.  

   - A2, B2, C2, D2: Applicable to industrial water, seawater, and environmental protection projects (such as coastal sewage treatment plants). These scenarios may have certain corrosion or slightly high temperatures (but not exceeding 80°C).  

   - B3, C3, D3: Specifically used for high-temperature occasions, such as high-temperature industrial wastewater treatment (such as printing and dyeing wastewater after high-temperature treatment) or high-temperature water quality monitoring in chemical production processes.  

Summary  

The RK500-12 pH Sensor series provides a complete solution for Water quality pH monitoring through scientific model differentiation. Each model is designed for specific application scenarios, with differences in installation structure, material selection, temperature/pressure resistance, and connection methods, ensuring that users can find the most suitable PH probe from Various pH sensors options.