An ORAKEL pH sensor measures the online pH of any aqueous solution

pH probe

Our range of ORAKEL pH probe can measure the online pH of any aqueous solution. They are combination glass electrodes with integral reference and automatic temperature compensation which use no reagents, are extremely stable and have reduced maintenance and lower whole-life costs.

The pH5 electrode has a double-junction reference to prevent contamination of the reference from sample components. This design gives the electrode a longer life compared to ordinary electrodes (up to 3 yrs). The electrode also has a hemi-shaped glass measuring surface which is more durable than the traditional bulb-shaped glass. Sitting at the top end of the market place, the ORAKEL pH probe has a longer life and lower maintenance requirements. Typically it only needs calibrating once every two or three months, making it a very cost effective solution.

pH5 and pH6 are particularly sensitive to difficult applications such as very low ionic strength waters or high temperature applications. The pH1-3 models in the range are less expensive, and have more traditional combination electrodes.


Anywhere you have a requirement to measure pH is a suitable application for the ORAKEL pH probe. One area the sensors excel is in the measurement of pH in very low conductivity or ultra clean water. They are also particularly suited to working in sites where reliability and ease of use are most important.

Typical applications include:

  • Remote Sites
  • Food Preparation
  • Potable Water
  • Cooling Towers
  • Paper Mills
  • Chemically Challenging Applications






installation options

The ORAKEL PH sensors can be installed in a variety of auxiliary flow cells and self-cleaning devices.


The ORAKEL can  come equipped to automatically clean itself at user defined intervals with all the benefits of no operator intervention for 6 months. The Autoflush is particularly useful in food preparation, pulp and paper, and many applications where there is likely to be a build up of solids in the sample. Autoflush is available for at line, and in line versions including dip and screw in autoclean pipe version.

quick selection guide

Potable Water
Waste Water
Boiler Feedwater
Single Open Flow Cell
Dual Open Flow Cell
Triple Open Flow Cell
Closed Flow Cell
Autoclean (flow cell)
Autoclean Immersion (dip)
Autoclean Insertion (in pipe)
At Line Tee
Welding Stub
ConnectorBNC ConnectorBuilt in CableBuilt in CableBuilt in CableBuilt in Cable
Standard Cable Length1 meter3 meters6 meters6 meters6 meters
Inbuilt Temperature
Maximum Temperature80°C80°C80°C100°C100°C
Automatic Temperature Compensation
Conductivity>100 μS/cm>100 μS/cm>100 μS/cm>100 μS/cm>300 μS/cm
Life Expectancy12-18 months12-18 months12-18 months3 years18 months
Back/Front Thread¾" NPT¾" NPT¾" NPT¾" NPT¾" NPT

key features and product specification

  • Up to 5 years continuous operation
  • Stable and reliable
  • Suitable for all potable and process waters
  • Suitable for very low conductivity waters
  • Integral temperature compensation


ORAKEL pH datasheet

ORAKEL control unit datasheet

MMS B008 – ORAKEL Product Guide

Contact Us


+44 (0)1282 449124

Regent St
Whitewalls Industrial Estate


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