Endress+Hauser PH/ORP Transmitter and Electrode with Ceramic Membrane 0.1% Accuracy and 40 Bar Pressure Range

In industrial PH/ORP measurement systems, transmitters and electrodes are the core components that determine measurement accuracy and stability. As a leader in the industrial automation sector, Endress+Hauser (E+H) is renowned for its PH/ORP product portfolio with precise functional segmentation and broad scenario adaptability. This article will break down the classifications, performance characteristics, applicable scenarios and cost levels of PH/ORP transmitters and electrodes in detail, providing accurate references for component selection in industrial applications.

Core Functions of PH/ORP Transmitters: Convert electrode signals into standard signals such as 4-20mA+HART, integrate functions including data display, fault diagnosis and calibration management, and serve as the key link connecting electrodes and control systems. E+H transmitters are divided into two categories based on functional complexity, with the core features summarized as follows:

Featuring a modular design, it supports PH/ORP mode switching, equipped with a two-line display and multi-language menu, and enables fast two-point calibration via the CAL key. It has safety functions such as overvoltage protection, compatible with both analog and digital sensors. Suitable for conventional scenarios like water treatment and chemical neutralization tanks, it offers a high cost-performance ratio.

Adopting a 4-wire design with high accuracy, it can monitor electrode status, impedance and signals, with built-in data logging and automatic buffer recognition as well as one-click calibration. It supports advanced functions such as automatic cleaning and integral-derivative measurement, and is expandable for dual-loop measurement, with outputs complying with NAMUR standards. Adapted for precision control scenarios such as chemical reactors, food and pharmaceutical production, it is priced at $1,800-$2,500 per unit, meeting high-end control requirements.

PH/ORP electrodes are the core components that directly contact the measured medium and collect PH/ORP signals, and their performance directly determines measurement accuracy and stability. E+H electrodes can be subdivided across three dimensions: measurement type, signal type and material characteristics. Different types show distinct differences in accuracy, anti-interference ability, medium adaptability and cost, fully covering various complex working conditions in the industrial field.

Pure PH electrodes are dedicated to PH value measurement. Classified by signal type, they include digital and analog types; classified by material, they are divided into non-glass and conventional glass types, adapted to different interference environments and medium characteristics.

Core models include CPS491D, CPS171D, CPS341D, etc. Adopting Memosens digital technology, they feature strong signal anti-interference ability and can directly output digital signals, supporting long-distance transmission (up to 1,000 meters for some models). Some models support predictive maintenance and laboratory calibration, enabling convenient on-site replacement. With a measurement accuracy of ±0.01-0.02 pH and a response time of ≤2 seconds, they are suitable for scenarios such as chemical workshops with high electromagnetic interference and water treatment systems with long-distance wiring.

Core models include CPS471, CPF201, CPS441, etc. They output mV-level analog signals, with a measurement accuracy of ±0.02-0.1 pH and a response time of ≤3 seconds. Featuring a simple structure, they need to be used with transmitters and have relatively weak anti-interference ability, suitable for short-distance transmission (≤50 meters). Their applicable scenarios include municipal sewage treatment, cooling water treatment, general chemical storage tanks, etc., offering outstanding cost-performance ratio.

Non-glass PH electrodes such as CPS77D and CPS47D adopt non-glass sensing materials such as ISFET, featuring wear resistance, corrosion resistance and no risk of glass breakage, with a service life over 30% longer than conventional glass electrodes and a measurement accuracy of ±0.02 pH. They are adapted to media containing solid particles, strong acids and alkalis, priced at $700-$1,200 per unit. Conventional glass PH electrodes such as CPS11D and CPS12D use special glass as the sensing material, with high measurement accuracy (±0.01 pH) and fast response speed (≤1.5 seconds), suitable for clean liquid scenarios such as pharmaceutical purified water and electronic ultrapure water.

Pure ORP electrodes are dedicated to oxidation-reduction potential measurement, also divided into digital and analog types by signal type. Digital ORP electrodes with core models including CPS72D, CPS42D, CPF82D, etc., adopt Memosens technology with strong anti-interference ability, supporting long-distance transmission and pre-calibration. With a measurement range of -1000~+1000 mV, accuracy of ±2 mV and response time of ≤3 seconds, some models have temperature compensation functions, suitable for complex scenarios such as electroplating solution monitoring and printing and dyeing wastewater treatment.

Analog ORP electrodes with core models including CPS92E, CPS72E, CPS42, etc., output mV-level analog signals, with a measurement range of -1000~+1000 mV, accuracy of ±5 mV and response time of ≤5 seconds. Featuring a simple structure, they are suitable for conventional scenarios such as municipal sewage disinfection and swimming pool water quality maintenance.

Combined electrodes adopt an integrated design, capable of measuring both PH and ORP parameters simultaneously, reducing installation space and wiring costs. Core models include CPS76E, CPS96E, CPS16E, CPS76D, CPS96D, etc. Digital models support Memosens technology with strong anti-interference ability, while analog models offer lower costs. With a PH measurement accuracy of ±0.02 pH, ORP measurement accuracy of ±3 mV and response time of ≤3 seconds, they are suitable for scenarios requiring synchronous collection of dual parameters such as chemical reactors, aquaculture water quality management and environmental online monitoring stations.

E+H PH/ORP transmitters and electrodes form a complete core measurement system: basic transmitters are adapted to conventional scenarios, while advanced ones meet precision control needs; digital electrodes are suitable for complex interference and long-distance transmission, while analog electrodes focus on cost-performance ratio; non-glass electrodes are adapted to harsh media, glass electrodes focus on high-precision clean scenarios, and combined electrodes efficiently address dual-parameter monitoring requirements.

During selection, a comprehensive judgment should be made based on working conditions, measurement accuracy requirements, transmission distance and cost budget to ensure component matching and system stability.