High-Accuracy pH/ORP Sensor for Ultra-Pure Water Applications
The ABB 700 ULTRA pH/ORP Analog Sensor is designed for applications where conventional pH sensors may struggle due to extremely low conductivity and demanding water quality requirements.
In ultra-pure water systems, the low concentration of ions can make stable pH measurement challenging. The 700 ULTRA addresses this issue with a specialized flowing KCl electrolyte reference system, high-performance glass electrodes, and optimized sensor construction to maintain reliable measurement performance.
Typical applications include:
Boiler water monitoring
Demineralized water systems
Steam and water analysis systems
Reverse osmosis (RO) systems
Condensate and feedwater monitoring
Power generation water chemistry control
Designed for Ultra-Low Conductivity Measurement
The main advantage of the ABB 700 ULTRA is its ability to deliver stable measurement in high-purity water environments.
The sensor is capable of operation in applications down to approximately 0.055 μS/cm conductivity, making it suitable for processes where small measurement variations can affect water chemistry control and equipment protection.
Compared with standard pH sensors, the 700 ULTRA provides:
Reduced measurement drift
Longer operation time
Better stability in pure water applications
Reliable response in low ionic strength media
Refillable KCl Reservoir Reference System
Reference stability is critical for accurate pH measurement, especially in ultra-pure water.
The ABB 700 ULTRA uses a refillable reservoir-fed KCl reference system, allowing the electrolyte to be replenished when required.
Benefits include:
Extended sensor operating life
Reduced frequency of sensor replacement
Improved measurement confidence
Stable reference potential over long-term operation
Triple Ceramic Junction for Faster and More Stable Response
The sensor features a triple ceramic junction design, which improves reference performance while reducing the risk of blockage.
This design helps provide:
Faster response speed
Improved measurement stability
Better resistance to junction contamination
It is especially valuable in continuous monitoring applications where stable readings are required over long operating periods.
Reliable pH and ORP Measurement Capability
The ABB 700 ULTRA supports both pH and redox (ORP) measurement depending on electrode configuration.
Measurement capability includes:
pH range: 0 to 14 pH
ORP range: -2000 to +2000 mV
Integrated temperature measurement
Available electrode options include:
High-performance (S) glass electrode
Low-temperature (LT) glass electrode
Platinum ORP electrode
Analog Connection for Traditional Process Systems
Unlike the digital 700 ULTRA-D, the ABB 700 ULTRA uses a traditional analog connection, making it suitable for existing analyzer systems and installations that do not require digital communication.
Connection options include:
Tinned leads
VarioPin connector
This allows easy integration with compatible ABB analytical transmitters and conventional pH/ORP measurement systems.
Modular Design for Flexible Installation
The ABB 700 ULTRA uses a standard 12 mm sensor design with PG13.5 process connection, allowing flexible installation with compatible assemblies and accessories.
Advantages include:
Easy replacement
Wide accessory compatibility
Simplified maintenance
Adaptation to different installation requirements
Designed for Power and High-Purity Industries
The ABB 700 ULTRA is mainly selected for applications where water purity directly affects process efficiency, equipment protection, and operational reliability.
Power Generation
Used for:
Boiler feedwater monitoring
Steam cycle chemistry control
Condensate quality measurement
Pharmaceutical Industry
Suitable for:
Purified water systems
High-purity water monitoring
Process water quality control
Semiconductor and Electronics
Applied in:
Ultra-pure water production
Contamination-sensitive processes
FAQ
What is ABB 700 ULTRA used for?
ABB 700 ULTRA is an analog pH/ORP sensor designed for high-purity and ultra-pure water applications requiring stable and accurate measurement.
What makes ABB 700 ULTRA different from standard pH sensors?
The 700 ULTRA is specifically optimized for low-conductivity water. Its refillable KCl reservoir and triple ceramic junction design improve stability and reduce drift compared with conventional sensors.
Can ABB 700 ULTRA measure ORP?
Yes. With the appropriate electrode configuration, the sensor can measure ORP from -2000 to +2000 mV using a platinum electrode.
What is the difference between ABB 700 ULTRA and 700 ULTRA-D?
The main difference is the communication method:
700 ULTRA: Analog pH/ORP sensor for traditional analyzer systems.
700 ULTRA-D: Digital version with ABB EZLink™ connection and advanced sensor diagnostics.
Can ABB 700 ULTRA be used for wastewater treatment?
Generally, no. The 700 ULTRA is designed for high-purity and low-conductivity water applications. For aggressive industrial wastewater or contaminated processes, ABB 500 series sensors are usually more suitable.
What is the maximum operating temperature of ABB 700 ULTRA?
Depending on electrode configuration, the sensor can operate up to 100 °C (212 °F).
