Reliable pH/ORP Sensor for General Industrial Applications

The ABB 100 GP pH/ORP Analog Sensor is a cost-effective and dependable solution for continuous pH and ORP monitoring in everyday industrial processes.

As part of ABB’s next-generation pH/ORP sensor family, the 100 GP combines proven electrode technology with a robust mechanical design, providing accurate measurement and reduced maintenance requirements for a wide range of applications.

Typical applications include:

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  Drinking water treatment
  
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  Municipal wastewater treatment
  
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  Cooling water systems
  
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  Food & beverage processing
  
• 
  General industrial water monitoring
  

Optimized Sensor Design for Stable Measurement

Accurate pH measurement depends heavily on electrode quality and reference stability.

The ABB 100 GP uses optimized glass electrode technology combined with an enhanced double junction reference system to provide:

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  Fast measurement response
  
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  Reliable pH/ORP readings
  
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  Reduced measurement drift
  
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  Longer sensor operating life
  

The integrated temperature measurement close to the process point also improves temperature compensation accuracy, especially during rapid process temperature changes.

Double Junction Reference with Ion Trap Technology

Reference contamination is one of the main causes of pH sensor failure.

The ABB 100 GP features an Ag/AgCl double junction reference system with gel electrolyte and ion trap technology.

This design helps protect the reference system by:

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  Slowing down harmful ion diffusion
  
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  Reducing reference poisoning effects
  
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  Capturing silver chloride ions before junction blockage
  
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  Improving long-term measurement stability
  

This makes the sensor more reliable compared with standard single-junction pH electrodes.

Anti-Fouling PTFE Junction for Difficult Water Applications

Industrial water and process fluids may contain suspended particles or contaminants that can cause sensor coating.

The 100 GP uses a large porous PTFE reference junction with Viton™ sealing, helping to:

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  Resist fouling and coating
  
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  Reduce blockage risk
  
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  Maintain stable reference flow
  
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  Simplify cleaning and maintenance
  

This makes it suitable for continuous operation in water treatment and industrial process environments.

Durable PVDF (Kynar) Sensor Body

The sensor body is manufactured from PVDF (Kynar), providing excellent mechanical strength and chemical resistance.

Advantages include:

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  Protection against aggressive process environments
  
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  Strong mechanical durability
  
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  Compatibility with various industrial installation systems
  

The compact ¾ inch NPT threaded design allows easy installation with different mounting assemblies.

Flexible pH and ORP Electrode Selection

The ABB 100 GP supports multiple electrode configurations to match different measurement requirements.

Available options include:

pH Measurement

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  High-performance (S) glass electrode
  
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  Flat glass electrode for in-line and fouling applications
  
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  Low-temperature (LT) glass electrode
  

ORP Measurement

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  Platinum ORP electrode
  

Measurement capability:

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  pH range: 0 to 14 pH
  
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  ORP range: -2000 to +2000 mV
  
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  Temperature range: -5 to 60 °C
  
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  Pressure rating: up to 6 bar
  

Simple Analog Integration

Unlike the digital 100 GP-D, the ABB 100 GP uses traditional analog connections, making it suitable for existing pH/ORP analyzer systems.

Available connection options include:

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  BNC connector
  
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  Tagged leads
  
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  VarioPin cable connection
  

This allows easy replacement of existing sensors without requiring major system changes.

Typical Applications

Water Treatment

Suitable for:

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  Drinking water quality monitoring
  
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  Wastewater neutralization control
  
• 
  pH adjustment processes
  

Cooling Water Systems

Used for:

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  Cooling tower monitoring
  
• 
  Chemical dosing control
  
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  Corrosion prevention
  

Food & Beverage Industry

Applied in:

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  Process water monitoring
  
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  Cleaning processes
  
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  Production quality control
  

FAQ

What is ABB 100 GP used for?

ABB 100 GP is an analog pH/ORP sensor designed for general process applications such as drinking water, wastewater, cooling water, and food & beverage measurement.

What is the difference between ABB 100 GP and 100 GP-D?

The main difference is the communication method:

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  100 GP: Analog pH/ORP sensor for traditional analyzer systems.
  
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  100 GP-D: Digital sensor with ABB EZLink™ connection, automatic recognition, and advanced diagnostics.
  

Does ABB 100 GP require frequent maintenance?

No. The double junction reference design, gel electrolyte, ion trap, and PTFE junction help reduce maintenance frequency and extend sensor lifetime.

Can ABB 100 GP measure ORP?

Yes. With the platinum ORP electrode configuration, the sensor can measure redox potential from -2000 to +2000 mV.

Is ABB 100 GP suitable for wastewater applications?

Yes. The 100 GP is suitable for municipal wastewater and general industrial water applications. For highly aggressive chemical processes or extreme conditions, ABB 500 series sensors are usually more suitable.

What is the difference between ABB 100 GP and 100 ULTRA?

The application focus is different:

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  100 GP: General process measurement, wastewater, cooling water, and drinking water.
  
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  100 ULTRA: Low-conductivity and high-purity water applications such as boiler water and demineralized water.