Overview
A split pH probe is an advanced electrochemical sensor designed for precise pH measurement in liquids. Unlike traditional combined probes, its modular design separates the sensing and reference electrodes, allowing independent replacement and maintenance. This design is particularly advantageous in harsh industrial environments or long-term monitoring applications where electrode wear varies. The probe consists of a glass pH-sensitive electrode and a reference electrode (often Ag/AgCl), housed in a durable PVC or epoxy body. It connects to a pH meter or transmitter via a shielded cable. Split probes are widely used in water treatment, pharmaceutical production, food processing, and research laboratories due to their reliability and adaptability.
Structure and Working Principle
The split pH probe’s sensing electrode contains a pH-sensitive glass membrane that generates a millivolt signal proportional to hydrogen ion concentration. The reference electrode provides a stable voltage baseline, typically filled with KCl electrolyte. The voltage difference between the two electrodes correlates to pH via the Nernst equation (59.16 mV/pH unit at 25°C). Temperature compensation is critical for accuracy, and most probes integrate a temperature sensor (e.g., PT1000) or allow external input. The split configuration minimizes cross-contamination between electrodes and extends lifespan, as the reference electrode (prone to clogging) can be replaced without discarding the entire probe.
Key Features
Modularity is the standout feature, enabling cost-effective maintenance. High-quality probes achieve ±0.01 pH accuracy with low drift, thanks to stable reference electrolytes and robust glass formulations. Some models offer double-junction references to prevent silver sulfide poisoning in sulfide-rich environments. Durability is enhanced by chemical-resistant materials (e.g., epoxy for acidic solutions, PVDF for solvents). Automatic Temperature Compensation (ATC) ensures readings remain accurate across 0–100°C ranges. Optional features include preamplifiers for long-distance signal transmission and digital interfaces (e.g., RS485) for industrial automation.
Application Areas
Industrial wastewater treatment facilities rely on split pH probes for continuous monitoring of effluent neutrality. In biotechnology, they ensure optimal pH for fermentation processes. Food and beverage industries use them to control product consistency (e.g., dairy, brewing). Environmental agencies deploy these probes in rivers and lakes to assess ecological health. Laboratories benefit from their precision in chemical analysis and titrations. The split design is particularly valuable in processes with frequent calibration or exposure to fouling agents, where quick electrode replacement minimizes downtime.
Maintenance and Precautions
Regular calibration with pH 4.01, 7.01, and 10.01 buffers is essential. Always rinse the probe with deionized water between measurements to prevent contamination. For storage, keep the sensing bulb hydrated in a KCl solution (typically 3M) to maintain the gel layer. Avoid abrasive cleaners or organic solvents that may damage the glass membrane. In high-temperature applications, gradual acclimatization prevents thermal shock. Inspect O-rings and junctions periodically; replace if leaks or slow response times occur. For CIP (Clean-in-Place) systems, verify the probe’s compatibility with sterilization methods like steam or caustic washes.
B2B Procurement Guide
When sourcing split pH probes, prioritize suppliers with ISO 9001 certification and traceable calibration records. Request datasheets detailing accuracy, response time, and operating conditions. Bulk buyers should negotiate warranties covering at least 12 months of industrial use. Consider total cost of ownership: cheaper probes may lack replaceable parts, increasing long-term expenses. For hazardous areas, confirm ATEX or IECEx ratings. Sample testing in real-world conditions is advisable. Leading manufacturers include METTLER TOLEDO, Hanna Instruments, and Yokogawa, though regional brands may offer cost advantages for specific applications.
Related Manufacturers
- 主营：流量计、电磁流量计、超声波液位计、在线ph计、物位计、压力变送器、电导率、溶氧仪、浊度仪、液位计、料位仪、超声波流量计、无纸记录仪、在线orp计、污泥浓度计、温度传感器、涡街流量计、雷达液位计、数显表、电压变送器、电流变送器、信号隔离器、冷热量表、热式气体质量流量计
- 主营：分析仪、监测仪、cod在线、指数在线、氨氮在线、在线监测、总氮在线、监测系统、超低烟气、水质自动、水质在线、微型水质、总磷总氮、微型水站、在线自动、参数水质、水质监测、硫酸盐监测、粉尘采样仪、在线氯化物、自动监测站、非甲烷总烃、亚硝酸盐氮、在线检测仪、挥发性有机
- 主营：温度传感器(热电阻)、数字不锈钢压力表、磁翻板液位计、高温铂铑热电偶、氧化锆氧量分析仪、工业用PH计、投入式静压液位变送器、流量计、补偿导线、智能数显压力变送器、双金属温度计、耐磨热电偶
- 主营：分析仪、水质在线、工业污水、在线ph计、ph控制器、在线监测仪、臭氧检测仪、监测仪氨氮、在线溶氧仪、余氯检测仪、在线电导率仪、溶解氧测定仪、水质分析浊度、臭氧浓度检测
- 主营：气体检测仪、水质检测仪、自动水质采样器、耐高温探头pH浓度计、测距仪、大气采样器、恒温恒湿称重系统、油气回收检测仪、风速仪、声级计、尘埃粒子计数器、湿球黑球温度指数仪、温湿度测试仪、烟尘烟气测试仪、红外测温仪、空气微生物采样器、VOC气体检测仪、可燃气体浓度检测仪、全自动菌落计数器
- 主营：voc检测仪、恒湿称重系统、油烟监测仪、耐高温探头pH浓度计、油烟检测仪、光散射、测定仪、cod消解、粉尘连续、自动采样器、大气采样器、采样测试仪、水质检测仪、烟气检测仪、水质采样器、在线分析仪、烟气含湿量、气体检测仪、烟气分析仪、回收检测仪、内置锂电池、自动分析仪、粉尘检测仪、激光粉尘仪、氧化碳分析仪、氟化物采样器
- 主营：流量计、液位计、压力变送器、在线ph计、无纸记录仪、水质分析仪、温度传感器、超声波液位计、电磁流量计、在线溶氧仪、在线浊度仪、多参数水质分析仪、有纸记录仪、涡街流量计、涡轮流量计、超声波流量计、雷达液位计、在线余氯分析仪
- 主营：分析仪、监测仪、测量仪、氧探头、在线仪、测定仪、传感器、排水管、流量计、电导率、监控仪、电磁流、电极orp、变送器、控制器、测试仪、校验仪、溶氧仪、浊度仪、探测仪、检测器、检测仪、自来水、压力表、液位计
- 主营：可燃气体报警器、有毒有害气体检测仪、VOC气体检测仪、磷化氢探头、恶臭在线监测系统、污染排放废气监测系统、粉尘浓度检测仪、固定四合一检测仪、便携六合一检测仪、气体传感器模组、管道气体检测仪
- 主营：程控定量封口机、97孔定量盘、酶底物法试剂、纯水pH探头、CST测试仪、醋酸铅纸带、润滑油检测仪、自动漩涡混合器、澄明度检测仪、细菌内毒素测定仪、防爆温湿度计、电线电缆长度测量仪、地毯平毛机、高压注脂枪、外夹式通球指示器、电阻率自动测定仪、深水温度计、暗箱式紫外分析仪、红外烘烤灯、颗粒强度仪、可控硅移相调节器、等强度粱实验装置、程控静态电阻应变仪、电测水位计、激光功率计、不锈钢贝勒管
- 主营：气体检测仪、水质分析仪、水质采样器、耐高温探头pH浓度计、大气采样器、烟尘烟气分析仪、粉尘颗粒物检测仪、油气回收检测仪、流量校准仪、林格曼黑度仪、VOC检测仪、FID、红外CO/CO2分析、甲醛检测仪、激光甲烷遥距仪、明渠流量计、风速仪、ATP荧光检测仪、TOC总有机碳分析仪、汽车尾气分析仪、红外测油仪、恒温恒湿称重系统
- 主营：检测仪、报警器、移动供气源、工业专用探头、呼吸器、重型防化服、洗眼器、防爆长管呼吸器、长管呼吸器、化学防护服、充气泵、耐酸碱、避火服、na-4电动、探测器、隔热服、空呼瓶、碳纤维、液氮服、全面罩、控制器、防毒全、低温服、防火服、防尘服、b级酸碱
- 主营：分析仪、采样器、监测仪、耐高温探头pH浓度计、消解器、粉尘仪、回流管、防护箱、测量仪、检测仪、培养箱、风速仪、黑度仪、微波炉、测定仪、遥测仪、萃取仪、指数仪、流量计、防护包、测油仪、真空泵、无氧培养、加热装置、水质监测、光电光度
- 主营：土壤传感器、传感器设备、气体传感器、传感器探头、水质传感器、环境气象监测设备、扬尘噪声传感器、物联网无线模块防水盒、噪声传感器、一体式风速风向仪、风速传感器、气象监测工业风向标、三杯式风速风向仪、在线PH控制器、水质PH值在线监测仪、翻斗式雨量监测站、便携式水质检测仪、光照度传感器、大棚土壤温湿度检测仪、PH传感器脱硫电极、无线管道温湿度传感器、水质浊度在线检测仪、土壤墒情监测系统、水质ORP传感器、水质PH测试仪
- 主营：分析仪、监测仪、报警仪、耐高温探头pH浓度计、吸气臂、回流管、无人船、测量仪、臭氧计、均质器、风速仪、均浆机、黑度仪、电子秤、测定仪、传感器、计数器、采样器、传声器、混匀仪、流量计、机器人、控制器、量率仪、测试仪、试验箱
- 主营：耐高温探头pH浓度计、明渠流量计、在线水质采样器
- 主营：水质分析仪、HACH、哈希、哈希PH探头、在线水质、聚酰亚胺、哈希代理、PH、水质检测仪、水质监测仪、电导率仪、总氯、COD、总磷总氮、溶解氧、HANNA、哈纳、实验室水质、便携式水质、哈希中国、水质仪表、溶氧、余氯、氨氮、中科院聚酰亚胺、测定仪
- 主营：变送器、流量计、雷达物位计、ph分析仪、超声波液位计、罗斯蒙特变送器、霍尼韦尔变送器、E H变送器