High Quality Laboratory Ph Sensor

1. Product Overview
Manufactured in Shanghai, China, the ACITEK G400-COND is a fixed-installation 4-wire conductivity transmitter tailored for industrial production and laboratory precision monitoring. Featuring a glass bead reinforced PBT enclosure and PP structural materials, the device delivers ultra-wide-range conductivity measurement (0.000 μS/cm – 200.0 mS/cm). It supports all mainstream 2-electrode and 4-electrode sensors, with freely selectable cell constants from 0.005 to 20 cm⁻¹, and compatible with Pt1000 and NTC 30 kΩ temperature detectors.
Equipped with a high-contrast LCD display, dual current outputs, two floating relay contacts, and dual 24VDC/230VAC power supply options, the transmitter integrates real-time sensor monitoring and preventive maintenance prompts. It supports wall, pipe and panel mounting, features intuitive operation and on-site medium calibration, and offers OEM/ODM customization with a standard one-year warranty.
2. Core Product Advantages
The G400-COND solves key pain points of traditional conductivity monitoring with outstanding comprehensive performance. Its full-range measurement adapts to various liquid environments without equipment replacement. Dual independent outputs realize synchronous detection and signal transmission of conductivity and temperature, supporting precise system control. The built-in relay alarm function enables automatic on-site equipment linkage without additional modules.
With corrosion-resistant and durable industrial-grade housing, it adapts to harsh production environments. Meanwhile, portable calibration, factory reset function and intelligent maintenance reminders greatly reduce daily operation and maintenance costs, ensuring long-term stable and accurate measurement data.
3. Main Application Scenarios
3.1 High-Purity Water Monitoring (Pharmaceutical, Electronics, Power Industry)
Widely used in pharmaceutical water for injection, semiconductor cleaning water and power plant boiler feedwater monitoring. Matched with low cell constant electrodes, it realizes real-time monitoring of water ion purity and automatic temperature compensation. It triggers alarms and linkage protection when water conductivity exceeds the standard, effectively avoiding product contamination and equipment scaling, and meeting GMP and industrial safety supervision standards.
3.2 Industrial Circulating Water & Cooling Tower Control
Applied to factory cooling circulating water systems, it monitors conductivity changes caused by water evaporation and salt accumulation in real time. By setting threshold parameters, it automatically controls pipeline blowdown and scale inhibitor dosing, optimizes water circulation concentration ratio, reduces fresh water consumption and chemical costs, and prevents pipeline corrosion and blockage.
3.3 Chemical & Electroplating Process Concentration Control
Adaptable to acid-base mixing solutions and electroplating bath liquid monitoring. By configuring different cell constants for solutions of varying concentrations, it realizes closed-loop automatic control of solution concentration through relay-linked dosing pumps. It also monitors the salinity of factory wastewater discharge to ensure compliance with environmental protection discharge standards and stabilize product yield.
3.4 Sewage & Reclaimed Water Treatment
Installed in sewage treatment tanks and discharge pipelines, it uses conductivity data to reflect water TDS content, quickly identify sudden impact of high-salinity wastewater, and monitor the treatment effect of reclaimed water. Real-time data upload meets environmental supervision recording requirements and helps optimize biochemical treatment processes.
3.5 Food & Beverage CIP Cleaning Monitoring
Used for pipeline CIP acid-base cleaning process monitoring in food and beverage factories. It judges detergent concentration and fresh water rinsing endpoint through conductivity values, avoids residual cleaning agents affecting food safety, realizes automated cleaning control, and saves water and detergent resources.
3.6 Laboratory Analytical Testing
Suitable for long-term fixed monitoring of laboratory sample solutions. It supports flexible parameter calibration and cell constant adjustment, with a clear high-contrast display. The integrated temperature detection function realizes comprehensive analysis of solution properties, simplifying laboratory daily detection and instrument maintenance work.
4. On-Site Application Compatibility
The G400-COND boasts strong on-site adaptability. Three installation methods adapt to equipment rooms, outdoor stations and laboratory cabinets. The universal power supply design matches mainstream industrial power systems, and standard 4–20mA analog signals are seamlessly compatible with PLC, DCS and monitoring hosts. It supports most mainstream sensors on the market, reducing equipment upgrade costs. Customized services can meet the personalized needs of system integrators and manufacturers.
5. Conclusion
The ACITEK G400-COND conductivity transmitter is a multi-scenario, high-stability monitoring instrument integrating detection, alarm and signal transmission. With full-range measurement, intelligent control, simple operation and strong environmental adaptability, it covers mainstream monitoring scenarios such as industrial water treatment, chemical production, food processing and laboratory testing. With reliable quality and perfect after-sales guarantee, it provides efficient, low-cost and automated conductivity monitoring solutions for various industries.

On April 28, 2026, ACITEK proudly announces the launch of its latest innovation—the AC8221 Conductive Sensor. Designed specifically for sanitary industrial applications, this cutting-edge 2-electrode sensor combines advanced engineering with FDA-compliant materials, ensuring unrivaled performance and reliability in hygienic environments.

Optimal Design for Sanitary Applications

The AC8221 Conductive Sensor is built with the highest standards in mind for industries that prioritize cleanliness and sterility. With its key wetted parts made from 316L stainless steel, a metal renowned for its corrosion resistance and durability, the sensor is built to withstand challenging conditions while ensuring product integrity. The utilization of FDA-compliant PEEK and EPDM materials further reflects ACITEK’s commitment to maintaining hygienic and safety standards suitable for various applications, including food and beverage, pharmaceuticals, and biotechnology processes.



Advanced Features for Precision Measurement



Equipped with an integrated Pt1000 temperature sensor, the AC8221 offers enhanced precision by allowing users to simultaneously monitor the temperature and conductivity of liquids. This dual-functionality eliminates the need for multiple devices, simplifying the measurement process. The sensor supports both 1½" clamp and ¾ NPT process connections, making it versatile and easy to integrate into existing systems without requiring extensive modifications.



The design features a low Ra electro-polished surface, which minimizes the risk of bacterial growth and accumulation of contaminants, a critical factor in maintaining sanitary conditions. This smooth finish not only enhances the aesthetic appeal of the sensor but also simplifies cleaning procedures, ensuring compliance with rigorous hygiene protocols.

Robust Performance Under Extreme Conditions

One of the standout features of the AC8221 is its ability to deliver stable and linear measurement results for both pure and concentrated liquids across a wide range of temperatures and pressures. Rated for high temperature and pressure resistance, this sensor allows for flexible operation in demanding industrial environments. Whether it's hot steam in a pharmaceutical plant or caustic cleaning agents in food processing, the AC8221 stands resilient, ensuring the measurement integrity remains uncompromised.

Trusted Certifications for Peace of Mind

When it comes to industrial sensors, certification is paramount. The AC8221 meets stringent CIP (Cleaning in Place) and SIP (Sterilization in Place) hygienic certifications, providing end-users with the peace of mind they seek when investing in equipment for sensitive applications. Additionally, with FDA and USP Class VI certification, the sensor guarantees compliance with some of the highest safety and quality standards in the industry, affirming its suitability for use in critical processes.

Perfect for a Variety of Applications

The versatility of the AC8221 makes it suitable for a variety of environments. Industries such as food and beverage, pharmaceuticals, and laboratories can all benefit from this advanced conductivity sensor. Whether monitoring sugar concentration in a beverage manufacturing process, ensuring patient safety in medical settings, or maintaining the quality of laboratory experiments, the AC8221 is engineered to support various applications.

Customization for Unique Requirements

Understanding that each client may have distinct needs, ACITEK offers customization options through OEM and ODM services. This flexibility allows businesses to tailor the AC8221 to meet specific operational requirements, ensuring optimal performance for their particular applications. Whether it's unique design specifications, connection types, or additional sensors, ACITEK is committed to facilitating customer satisfaction through versatile manufacturing solutions.

Elevating Industry Standards with ACITEK

With the launch of the AC8221 Conductive Sensor, ACITEK has once again demonstrated its commitment to excellence in industrial measurement solutions. The combination of hygienic design, robust performance, trusted certifications, and customization options positions the AC8221 as a leading choice for industries requiring reliable and hygienic measurements. The innovation reflects ACITEK’s pledge to support businesses with advanced technologies that promote safety, efficiency, and compliance in their operations.

Discover the future of sanitary measurements with the ACITEK Conductive Sensor Type AC8221—where precision meets hygiene in every application. Whether for industrial, laboratory, or specialized use, the AC8221 is engineered to redefine how businesses approach conductivity measurement in the most sensitive environments. Experience the ACITEK difference today.

Case 1: Thermal Power Plant Boiler Feed Water & Condensate Monitoring
Project Background
A 2×300MW thermal power plant in East China needs full-process monitoring of deaerator outlet feed water, condenser condensate and boiler drain water. Per national power industry standard DL/T 502.29-2019, tiny ion impurities in water will cause boiler scaling and turbine blade corrosion, which may trigger unplanned shutdown and huge economic loss. The original old conductivity sensors had two pain points:


Ordinary 304 stainless steel electrodes corroded rapidly under chloride-containing condensate, measurement drift occurred within 3 months;
Non-standard thread fittings required customized welding bases, high installation cost and difficult later disassembly maintenance.

ACITEK Solution Deployment

Sensor selection: AC58031404 SS316L 2-electrode conductivity sensor (K=1cm⁻¹), 3/4NPT male thread directly matched with pipeline standard 3/4NPT tee joint, no extra custom fittings;
Installation layout: Installed on condensate sampling pipeline, boiler feed water outlet and blowdown pipeline via side pipeline insertion; 44mm insertion length ensures electrode fully immersed in stable fluid, avoiding bubble interference;
System matching: Paired with ACITEK G100 compact DIN rail transmitter, 4-20mA active signal access plant DCS system, RS485 Modbus upload data to SCADA platform; built-in PT1000 automatic temperature compensation eliminates temperature drift error of high-temperature water samples;
Working condition adaptation: SS316L material resists trace chloride ion corrosion in condensate, withstands 17bar working pressure and 90℃ sampling water temperature.

On-site Operation Effect

Measurement stability: After 12 months continuous operation, measurement deviation is always within ±1% (0.02~5000µS/cm) and ±3% (>5000µS/cm), no regular calibration drift phenomenon;
Maintenance cost reduction: Replace cycle extended from 3 months to 12 months, only quarterly simple surface cleaning is needed, saving 70% of annual sensor replacement labor & material cost;
Safety optimization: Real-time conductivity abnormal linkage alarm timely reminds resin regeneration and condenser leakage risk, boiler scaling failure rate decreased by 8%, annual power generation loss risk reduced greatly.

Case 2: Semiconductor Factory Ultrapure Water (UPW) Preparation Line Monitoring
Project Background
A wafer manufacturing enterprise in Shanghai built a 18.25MΩ·cm ultrapure water production line, requiring real-time monitoring of RO reverse osmosis effluent, EDI terminal ultrapure water and cleaning circulating water. The core demand is to capture tiny conductivity rise caused by membrane element damage or ion exchange resin failure, to avoid wafer etching pollution and mass product scrap.

Application Scheme & Configuration

Sensor matching logic: K=1cm⁻¹ wide-range electrode fits full-process water quality monitoring—low-conductivity ultrapure water (0.05~2µS/cm) and medium-conductivity intermediate circulating water (500~5000µS/cm) can be measured by one sensor model, reducing spare parts types;
Installation method: Adopt flow cell pipeline installation, 3/4NPT thread quickly connect small-bore flow cell, compact structure fits narrow space of ultrapure water equipment rack;
Signal transmission: 5m shielded cable anti-electromagnetic interference in clean workshop, matched G100-DIN rail transmitter centralized installed in small control cabinet, multi-point conductivity data unified upload to water treatment PLC;
Customization support: Factory customized 10m long cable for remote sampling points according to workshop layout, realizing unified sensor model for all monitoring positions.

Actual Benefit

Early warning capability: Quickly capture conductivity fluctuation of 0.1µS/cm, advance 3~5 days to judge EDI resin failure, avoid batch wafer contamination loss;
Cost optimization: Single sensor covers all water quality sections, no need to prepare multiple electrode constants for different process sections, spare parts inventory cost cut by 45%;
Stable long-term operation: SS316L electrode will not release metal ions into ultrapure water, meet semiconductor high-purity water monitoring requirements, one-year warranty provides stable after-sales guarantee.

Case 3: Fine Chemical Plant Reaction Kettle & Circulation Cooling Water Monitoring
Project Overview
A fine chemical factory producing pharmaceutical intermediates has multiple reaction kettles and cooling water circulation systems. It needs to monitor electrolyte concentration in synthesis liquid and circulating water conductivity to control reaction conversion rate and prevent pipeline scaling blockage. The medium contains weak organic acid and trace chloride, putting forward high corrosion resistance requirements for electrodes.

ACITEK Deployment Plan

Tank & dual pipeline installation: Reaction kettle side wall 3/4NPT thread interface for sensor insertion; cooling water main pipeline symmetrical installation two sensors to monitor inlet & outlet conductivity;
Material advantage: SS316L electrode effectively resist weak acid and chloride corrosion, compared with plastic-shell electrodes, it is not easy to deform and aging under 80℃ circulating water long-term soaking;
Control linkage: 4-20mA signal feeds back to reaction PLC, automatically adjust raw material feeding amount according to solution conductivity; cooling water conductivity high value triggers automatic dosing & blowdown control to reduce scaling;
Maintenance convenience: Standard 3/4NPT thread can be directly screwed out without stopping production for short-term replacement cleaning, greatly improving production continuity.

Site Feedback

Reaction yield improved: Stable real-time conductivity data optimizes feeding control, intermediate product yield increased by 12%;
Pipeline maintenance cycle extended: Timely cooling water blowdown control reduces scaling frequency, pipeline cleaning cycle from 1 month extended to 4 months;
Wide range adaptability: One sensor continuously measures synthesis liquid (1000~20000µS/cm) and cooling water (50~800µS/cm), equipment procurement cost reduced.

Case 4: Small Factory Sewage Treatment Station Discharge Water Monitoring
Demand Background
Multiple small chemical & food processing factories built decentralized sewage treatment stations, needing online conductivity monitoring of aerobic tank effluent and final discharge water to meet environmental protection real-time upload requirements. The on-site cabinet space is narrow, with limited maintenance manpower, requiring low-cost, easy-to-install & low-maintenance conductivity measurement solution.

Matching Solution

Low-cost integrated system: AC58031404 conductivity sensor + G100 ultra-narrow DIN rail transmitter (12.5mm width), multiple sets side-by-side installed in small control box without cabinet reconstruction;
Immersion installation: 3/4NPT thread matched with stainless steel mounting sleeve, directly put into sewage outlet weir tank, 44mm insertion length avoids sludge sediment coverage at tank bottom;
Signal output dual mode: 4-20mA analog signal access environmental protection data collector, RS485 remote data upload to factory cloud platform, realize unattended monitoring;
Adapt to wastewater medium: SS316L anti-corrosion electrode resists sewage weak acid & alkali medium, not easy to be corroded by organic sewage.

Operation Results

Meet environmental compliance requirements: Continuous 24h online conductivity data meets local environmental bureau monitoring upload standards, no penalty risk due to missing monitoring data;
Labor saving: Only quarterly simple cleaning of electrode surface sludge, no frequent calibration, suitable for unattended small sewage stations;
Space saving advantage: Ultra-thin transmitter + compact sensor solves the problem of small control box insufficient installation space, overall equipment investment reduced by 30% compared with split large display conductivity meters.

Core Product Advantages Reflected in All Cases

Universal 3/4NPT standard thread: Compatible with all industrial pipeline, tank, flow cell common interfaces, no customized fittings, low installation cost and fast construction;
SS316L all wetted material: Excellent corrosion resistance to chloride, weak acid, weak alkali medium, long service life in power, chemical, semiconductor, wastewater industries;
K=1cm⁻¹ ultra-wide measurement range (0.02~50000µS/cm): Cover ultrapure water, intermediate process water, high-salinity sewage, one model for multi-scene use, reduce spare parts inventory;
Built-in PT1000 temperature sensor: Automatic temperature compensation, eliminate measurement error caused by medium temperature change, stable data under high/low temperature working conditions;
Flexible cable customization: Standard 5m cable, support OEM/ODM customized length to adapt long-distance sampling points;
Perfect matching ACITEK G100 DIN rail transmitters: Form compact low-cost online conductivity monitoring system, 4-20mA + RS485 dual signal output, compatible with all mainstream PLC/DCS industrial control systems;
Pressure & temperature resistance: Max 17bar (250psig) pressure, 93℃ medium temperature, adapt high-temperature & high-pressure industrial water sampling pipelines.

Summary
ACITEK AC58031404 SS316L 2-electrode conductivity sensor breaks the limitation of single-scene electrodes. With standard 3/4NPT thread, wide measurement range and reliable corrosion-resistant material, it has formed mature, low-cost and stable monitoring schemes in power, semiconductor, fine chemical and wastewater treatment industries. Whether it is high-standard ultrapure water precision monitoring, high-temperature high-pressure power plant water sampling, corrosive chemical process liquid control or decentralized sewage environmental monitoring, this sensor can meet on-site measurement demands, and combined with ACITEK G100 series compact transmitters, it provides users with space-saving, easy-maintenance and customizable industrial water conductivity full-set measurement solutions.