In industrial pH/ORP measurement systems, transmitters and electrodes are the core components that determine measurement accuracy and stability. As a leader in industrial automation, E+H is known for its pH/ORP product system with precise functional segmentation and wide application adaptability. This article will provide a detailed breakdown of pH/ORP transmitters and pH/ORP electrodes, including their classification, performance characteristics, application scenarios, and cost levels, offering accurate references for selection in industrial scenarios.
I. pH/ORP Transmitters: The Core Hub for Signal Processing
The core function of pH/ORP transmitters is to convert electrode signals into standard signals such as 4-20mA+HART, while also providing data display, fault diagnosis, and calibration management. They are the key link between electrodes and control systems. E+H transmitters are divided into two categories based on functional complexity, summarized as follows:
1. Basic General-Purpose Type (CPM223, CPM253)
- Modular design, supports pH/ORP mode switching
- Two-line display + multilingual menu, CAL key for quick two-point calibration
- Equipped with safety functions such as overvoltage protection, compatible with analog/digital sensors
- Suitable for conventional scenarios such as water treatment and chemical neutralization tanks, with high cost-effectiveness
2. Advanced Functional Type (CPM153)
- Four-wire design, high precision, can monitor electrode status/impedance/signal
- Built-in data logging and automatic buffer recognition, one-key calibration
- Supports advanced functions such as automatic cleaning and integral/derivative measurement, expandable to dual-loop measurement
- Output complies with NAMUR standards, suitable for precise control scenarios such as chemical reactors, food and pharmaceutical industries
- Unit price 1800-2500 USD, meeting high-end control needs
II. pH/ORP Electrodes: Core Elements for Medium Detection
pH/ORP electrodes are the core components that directly contact the measured medium and collect pH/ORP signals. Their performance directly determines measurement accuracy and stability. E+H electrodes can be subdivided by three dimensions: measurement type, signal type, and material characteristics. Different types form clear differences in accuracy, interference resistance, medium adaptability, and cost, comprehensively covering various complex industrial conditions.
1. Pure pH Electrodes: Focused on Accurate pH Measurement
Pure pH electrodes are only responsible for pH measurement. They can be divided by signal type into digital and analog, and by material into non-glass and conventional glass types, adapting to different interference environments and medium characteristics.
- Digital pH Electrodes: Core models include CPS491D, CPS171D, CPS341D, etc. They use Memosens digital technology, with strong signal interference resistance, can directly output digital signals, support long-distance transmission (up to 1000 meters for some models), and some models support predictive maintenance and laboratory calibration. On-site replacement is convenient. Measurement accuracy is ±0.01-0.02 pH, response time ≤2 seconds. Suitable for scenarios such as chemical workshops with high electromagnetic interference and water treatment systems with long-distance wiring.
- Analog pH Electrodes: Core models include CPS471, CPF201, CPS441, etc. They output mV-level analog signals, with measurement accuracy ±0.02-0.1 pH and response time ≤3 seconds. Simple structure, need to be used with a transmitter, weaker interference resistance, suitable for short-distance transmission (≤50 meters). Application scenarios include municipal wastewater, cooling water treatment, ordinary chemical storage tanks, etc., with outstanding cost-effectiveness.
- Non-Glass pH Electrodes: Such as CPS77D, CPS47D, etc., using ISFET and other non-glass sensing materials, wear-resistant, corrosion-resistant, no risk of glass breakage, service life more than 30% longer than conventional glass electrodes, measurement accuracy ±0.02 pH, suitable for media containing solid particles, strong acids and alkalis. Unit price 700-1200 USD.
- Conventional Glass pH Electrodes: Such as CPS11D, CPS12D, etc., using special glass as sensing material, with high measurement accuracy (±0.01 pH) and fast response (≤1.5 seconds), suitable for clean liquid scenarios such as pharmaceutical purified water and electronic ultrapure water.
2. Pure ORP Electrodes: Focused on Redox Potential Monitoring
Pure ORP electrodes focus on redox potential measurement and are also divided by signal type into digital and analog.
- Digital ORP Electrodes: Core models include CPS72D, CPS42D, CPF82D, etc. They use Memosens technology, with strong interference resistance, support long-distance transmission and pre-calibration. Measurement range -1000~+1000 mV, accuracy ±2 mV, response time ≤3 seconds. Some have temperature compensation function. Suitable for complex scenarios such as electroplating solution monitoring and printing and dyeing wastewater treatment.
- Analog ORP Electrodes: Core models include CPS92E, CPS72E, CPS42, etc. They output mV-level analog signals, measurement range -1000~+1000 mV, accuracy ±5 mV, response time ≤5 seconds. Simple structure, suitable for conventional scenarios such as municipal wastewater disinfection and swimming pool water quality maintenance.
3. pH/ORP Combination Electrodes: Efficient Choice for Simultaneous Dual-Parameter Monitoring
Combination electrodes use an integrated design to simultaneously measure both pH and ORP parameters, reducing installation space and wiring costs. Core models include CPS76E, CPS96E, CPS16E, CPS76D, CPS96D, etc. Digital models support Memosens technology with strong interference resistance; analog models are lower in cost. Their pH measurement accuracy is ±0.02 pH, ORP measurement accuracy ±3 mV, response time ≤3 seconds. Suitable for scenarios requiring simultaneous dual-parameter collection such as chemical reactors, aquaculture water quality management, and environmental online monitoring stations.
III. Summary of Core Measurement Component Selection
E+H pH/ORP transmitters and electrodes form a complete core measurement system: basic transmitters adapt to conventional scenarios, advanced types meet precision control needs; digital electrodes are suitable for complex interference and long-distance transmission, analog electrodes focus on cost-effectiveness; non-glass electrodes adapt to harsh media, glass electrodes focus on high-precision clean scenarios, and combination electrodes efficiently solve dual-parameter monitoring needs. When selecting, it is necessary to comprehensively consider working conditions, measurement accuracy requirements, transmission distance, and cost budget to ensure component compatibility and system stability.
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