Industrial pH/ORP Sensor for Challenging Process Conditions
The ABB 500 PRO pH/ORP Analog Sensor is designed for industries where standard pH sensors may suffer from reference poisoning, chemical attack, fouling, or shortened service life.
Combining ABB’s advanced electrode technology with a rugged industrial construction, the 500 PRO provides reliable continuous measurement in aggressive process environments while reducing maintenance frequency and replacement costs.
Typical applications include:
Chemical processing
Wastewater treatment
Power generation
Mining and metals
Marine applications
Industrial water treatment
Process plants with harsh chemical conditions
Triple Junction Reference Design for Maximum Protection
Reference contamination is one of the main causes of pH sensor failure in industrial applications.
The ABB 500 PRO uses a triple junction Ag/AgCl reference system with KCl gel electrolyte and ion trap technology.
This advanced design helps to:
Reduce reference poisoning
Slow contamination effects
Extend sensor operating life
Maintain stable measurement performance
The additional reference barriers provide enhanced protection compared with standard double-junction sensors, making the 500 PRO suitable for difficult industrial processes.
Enhanced Chemical Resistance with PVDF Body
The sensor body is manufactured from PVDF (Kynar), providing excellent mechanical strength and chemical resistance.
Benefits include:
High resistance to aggressive process fluids
Strong mechanical durability
Reliable operation in industrial environments
Long-term protection of internal components
The robust ¾ inch NPT process connection enables easy installation into standard industrial assemblies.
PTFE Junction and Viton™ Extreme Protection
The reference junction is critical for maintaining measurement stability.
The 500 PRO combines:
Large porous PTFE junction
Viton™ Extreme O-ring protection
Reference shielding technology
This design provides:
Better resistance against fouling
Improved chemical protection
Reduced clogging risk
More stable reference performance
It is particularly suitable for applications where deposits, chemicals, or process contamination can affect conventional sensors.
Wide Measurement Capability for pH and ORP Applications
The ABB 500 PRO supports multiple electrode configurations, allowing users to select the appropriate sensor according to process conditions.
Measurement capability:
pH range: 0 to 14 pH
ORP range: -2000 to +2000 mV
Temperature range: -5 to 105 °C (23 to 221 °F)
Maximum pressure: 10 bar (145 psi)
Available electrode options include:
High-performance pH glass
Flat glass for fouling applications
Low-temperature glass
High-temperature glass
Hydrofluoric acid-resistant (HF) glass
Platinum ORP electrode
Fast Temperature Compensation for Accurate Measurement
Process temperature changes can affect pH measurement accuracy.
The ABB 500 PRO integrates the temperature sensor close to the measuring electrode, enabling:
Faster temperature response
More accurate temperature compensation
Improved measurement stability during dynamic process conditions
This is especially valuable in industrial systems with rapid temperature fluctuations.
Analog Connection for Existing Systems
The ABB 500 PRO uses a traditional analog connection, making it suitable for integration with existing pH/ORP analyzers.
Connection options include:
Tinned leads
BNC connector
VarioPin connection
This allows easy replacement of existing sensors without major system modifications.
Hazardous Area Approvals for Industrial Safety
For applications in potentially explosive environments, the ABB 500 PRO offers ATEX/IECEx certification, allowing use in approved hazardous areas.
This makes it suitable for industries such as:
Oil & gas
Chemical processing
Petrochemical plants
Other hazardous industrial facilities
Typical Applications
Chemical Industry
Suitable for:
Acid and alkaline process monitoring
Chemical dosing control
Reaction process pH control
Wastewater Treatment
Used for:
Neutralization processes
Industrial wastewater monitoring
Chemical treatment control
Power Generation
Applied in:
Cooling water monitoring
Process water control
Water chemistry management
Marine Applications
Suitable for:
Seawater monitoring
Marine process systems
Corrosion control applications
FAQ
What is ABB 500 PRO used for?
ABB 500 PRO is a high-performance pH/ORP sensor designed for harsh industrial and marine applications requiring enhanced chemical resistance, poisoning protection, and long sensor lifetime.
What is the difference between ABB 500 PRO and 100 GP?
The main difference is the application environment:
100 GP: General water, wastewater, and cooling water applications with cost-effective reliable measurement.
500 PRO: Harsh industrial applications requiring stronger resistance against contamination, chemical attack, and higher temperatures.
What is the difference between ABB 500 PRO and 500 PRO-D?
The sensor performance and mechanical design are similar, but the communication method differs:
500 PRO: Analog connection for traditional analyzer systems.
500 PRO-D: Digital sensor with ABB EZLink™ technology, automatic sensor recognition, and advanced diagnostics.
Can ABB 500 PRO measure ORP?
Yes. With the platinum ORP electrode configuration, ABB 500 PRO can measure redox potential from -2000 to +2000 mV.
Is ABB 500 PRO suitable for high-temperature applications?
Yes. Depending on the selected electrode type, the sensor can operate up to 105 °C (221 °F), making it suitable for demanding industrial processes.
What makes ABB 500 PRO different from standard pH sensors?
The key advantage is its triple-junction reference design with ion trap technology and chemical protection, which improves resistance against poisoning and extends operating life in difficult applications.
