ABB 700 ULTRA Analog pH/ORP Sensor

Overview

The ABB 700 ULTRA sensor is an analog pH/ORP sensor engineered for high-accuracy measurement in demanding process water applications, including ultrapure water down to 0.2 µS/cm conductivity where standard electrodes struggle to hold calibration. It uses a refillable, flowing KCl electrolyte reference with a triple ceramic junction design, giving it the fast, stable response needed for low-conductivity process streams.

Seven Star LLC supplies the ABB 700 ULTRA to power generation, semiconductor, and high-purity process operators across Oman and the wider GCC. Units are genuine ABB instrumentation, supplied with manufacturer documentation and backed locally with sensor-transmitter pairing guidance for ultrapure water applications.

Operating Principle

The 700 ULTRA’s defining engineering feature is its rechargeable KCl reservoir, which can be topped up in the field rather than requiring full electrode replacement when the reference electrolyte depletes – extending usable electrode life significantly compared to sealed, non-refillable designs. The triple ceramic junction improves speed of response and resists fouling, both critical in low-conductivity water where a sluggish or fouled reference junction directly degrades measurement stability.

The analog output connects via tinned leads or a VarioPin connector to compatible ABB transmitters, and the sensor covers a full 0–14 pH range along with ±2000 mV ORP, giving it the measurement span to serve both pH and ORP duty. Each electrode ships with its own calibration certificate, supporting the traceability documentation that power generation and semiconductor customers typically require.

Engineering Design of the ABB 700 ULTRA

Operating temperature range spans -5°C to 100°C at atmospheric, reservoir-fed pressure, giving the 700 ULTRA the thermal range needed for both ambient sample panels and hotter process taps. The refillable reservoir design is a deliberate engineering trade-off: it adds a small amount of routine maintenance (periodic electrolyte topping) in exchange for a much longer total service life than sealed reference electrodes, which is particularly valuable in ultrapure water applications where electrode replacement logistics can be disruptive.

Compatibility with ABB’s standard transmitter connections (tinned leads or VarioPin) means the 700 ULTRA integrates into existing ABB-based measurement architecture without requiring a new transmitter platform, simplifying adoption for facilities already standardized on ABB pH/ORP instrumentation.

Key Features

• High-accuracy analog pH/ORP measurement, effective down to 0.2 µS/cm conductivity
• Refillable, flowing KCl electrolyte reference – field-rechargeable, not sealed
• Triple ceramic junction for fast response and fouling resistance
• Full 0–14 pH range and ±2000 mV ORP coverage
• Tinned-lead or VarioPin connection to ABB transmitters
• Operating range -5°C to 100°C at atmospheric pressure
• Individual calibration certificate shipped with each electrode
• Extended service life versus sealed reference electrode designs

Industrial Applications

The 700 ULTRA is purpose-built for ultrapure water pH monitoring in power generation – boiler feedwater and condensate polishing – semiconductor rinse water, and other high-purity process streams where standard electrodes struggle to hold calibration at very low conductivity. Its calibration-certificate traceability also supports facilities with strict quality documentation requirements.

Across Oman’s power generation and industrial water treatment sectors, and throughout the wider GCC, Seven Star LLC supplies the 700 ULTRA to facilities in Muscat, Sohar, and Salalah that require dependable, factory-genuine ultrapure-water pH/ORP sensors with full local support.

Technical Specifications

Request a Quote for ABB 700 ULTRA Analog pH/ORP Sensor

Contact Seven Star LLC for a quotation on the ABB 700 ULTRA analog pH/ORP sensor, with manufacturer documentation and local support across Oman and the GCC.

Installation and Commissioning

Ultrapure water is one of the hardest services for pH measurement, so installation details matter as much as the sensor. Mount the ABB 700 ULTRA in a flow cell or sample panel with a steady, controlled sample flow; changing flow rate in low-conductivity water shifts the reading. Keep the sample line short, avoid air entrainment, and position the sensor so bubbles cannot collect at the glass bulb or junction.

• Fill the KCl reservoir before first use and check that electrolyte flows as intended.
• Connect the tinned leads or VarioPin connector to a compatible ABB transmitter and set the transmitter for the sensor type.
• Calibrate with fresh buffer solutions, then allow the sensor to stabilise in the process sample before accepting readings.
• Keep the calibration certificate with the loop documentation for traceability.

Maintenance and Troubleshooting

The refillable reference is the main routine task: check the electrolyte level at each visit and top up before the reservoir runs low. Record calibration slope and offset every time, because a slow change over weeks is the clearest early warning of an ageing electrode.

• Slow or drifting reading: check sample flow stability and electrolyte level first, then the junction for blockage.
• Noisy signal: look at grounding, cable routing and the sample flow cell.
• Low slope after calibration: clean the glass according to the manufacturer’s guidance; if the slope does not recover, the electrode may be at the end of its life.
• Readings differ from a grab sample: in pure water, grab samples absorb carbon dioxide from air quickly, so an online reading is often more reliable than a lab check.

Applications in Oman and the GCC

Combined-cycle power plants, independent water and power projects and industrial boiler houses in Oman monitor feedwater and condensate chemistry closely to control corrosion. The ABB 700 ULTRA sensor suits these low-conductivity points, while its temperature range covers warm sample panels common in Gulf plants. Desalination plants producing high-purity water for boilers use similar measurement points.

Sourcing from Seven Star LLC

Seven Star LLC supplies ABB analytical sensors and transmitters to power, water and process customers across Oman and the GCC. Tell us your transmitter model, connection type and sample conditions, and we will confirm the matching sensor, reference electrolyte needs and delivery time.

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