Dissolved Oxygen Sensors for ppb Applications

Yokogawa is working with HAMILTON to provide best-in-class dissolved oxygen sensors. Dissolved oxygen measurements in the parts per billion range are critical in, but not limited to power generating plants.

Maintaining a low level of dissolved oxygen in boiler feedwater assures that corrosion of certain components is minimized. A reliable measurement of ppb dissolved oxygen helps to reduce downtime and improve efficiency. The OXYGOLD G or OXYGOLD B sensor accurately measures trace levels of dissolved oxygen down to 1 ppb.

The modular design of the membrane cartridge allows simple recharging of the electrolyte or membrane replacement. It is not uncommon for the OXYGOLD G or OXYGOLD B sensor to not require maintenance for over 8 months after installation.

  • Simple two-minute calibration
  • Very little maintenance required
  • Easy electrolyte recharge and membrane replacement
  • Compact design

Oxygold Membrane Kit- part Number 237135


Oxylyte G Electrolyte for Oxygold G- Part Number 237139

Replacement Cathode for Oxygold G- Part Number 237427

Oxylyte B Electrolyte for Oxygold B- Part Number 237138

Replacement Cathode for Oxygold B- Part Number 237437

Hot-Tap Retractable Assembly, Model PR10

On-line measurements often present extra challenges, especially when routine maintenance is required. The PR10 is ideally suitable for applications where the sensors must be removed without interrupting or shutting down the process. Without any special tools the PR10 can be retracted safely from the process at pressures up to 5 bar (72 psi). The PR10 is a universal retractable assembly that can be used for all liquid measurements. The PR10 is designed to accept any commercially available pH/ORP or dissolved oxygen sensor that has a PG13.5 connection while still being backwards compatible with old Yokogawa electrodes.

For ease of use optional flush ports are available. In the retracted position the sensor can be kept moist, cleaned or even calibrated. This can all be done without process interruption or disassembly of the armature.

YouTube Main IconTraining Video: 
PR10 Installation and Extraction


  • One model for pH/ORP, dissolved oxygen, conductivity and inductive conductivity sensors
  • All commercially available pH electrodes, such as PG13.5, SMART sensors, Vario Pin, YEF and DIN connectors can be installed in the PR10
  • Integrated protection cage
  • A "scraper" is built-in to each assembly to effectively scrape or wipe off the process from the PR10's shaft as it is being retracted from the process
  • A safe "through the valve" insertion and retraction design
  • Simplified installation by optional ball valves with flanged or tapered connections
  • Optional flush port accessories makes it easy to keep sensors moist (pH) and clean, and also provides access for calibration if desired

PB30 Floating Ball- S200256U1

The PB30 floating ball holder features a design which minimizes fouling by the process. A brass ring around the sensor facilitates a check for membrane integrity and helps to eliminate any deposits of algae, making a cleaning system unnecessary for the model PB30. Maintenance is very simple, with only periodic inspection and calibration needed. 

Mini Flow Through Holder, Model K1598AC

When you use the adapter fitting, part number M1263LP, it converts any PG13.5 connection to a 3/4" MNPT. This allows for installation into the mini flow thru holder with a 1/4" NPT inlet nad outlet.

Other adapters are available for easy installation into the F*20 pH/ORP series of holders and the F*40 conductivity series of holders.

Application Note

The level of dissolved oxygen is critical to the quality and consistency of any brew. Too little dissolved oxygen results in the fermentation step of the process will lead to: off flavors (e.g. poor removal of diacetyl and acetaldehyde), poor yeast crop in terms of quantity and vitality, and low ester and alcohol production. 


Process liquid analyzers such as pH meters, conductivity meters, ORP meters, and density meters play an important role at electrolysis plants in the control of concentrations of various process solutions. This requires both precision and stability under harsh conditions that include highly corrosive substances, high temperatures, and many impurities.

How to startup a new sensor, or how to replace the Membrane Cap and Electrolyte.   Startup of a new Oxygold G sensor: The Oxygold G sensor is shipped dry with a protective cap over the end of the Membrane Cartridge. CAUTION: The electrolyte ...

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