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inline pH electrode system for installing into pipework for continuous or online pH measurements


Inline pH electrode systems

The measuring of pH within a piece of pipework is a common method of ensuring that a process pH is within the desired parameters.

An alternative to installing a threaded insertion pH probe either directly into pipework or within a tee piece, is to use an inline pH electrode system.

An inline pH electrode system allows a pH electrode to be installed into a piece of pipework for the precision measurement of process pH. Our standard inline pH electrode systems are of a fixed size and are a neat solution to measuring pH inline, allowing the pH electrode to remain securely in position. Removal is simple, with the quick release fitting and when solvent welded into place, they become a permanent piece of the pipework.

Our inline pH electrode systems include a mechanism for the quick release of the pH electrode. When the probe can be easily removed, this makes periodic buffering and calibration of the pH electrode a quick and clean process.

We do recommend installing isolation valves and a bypass before and after an inline pH electrode system. The only exception to this is our lock-n-load retractable pH electrode system. The lock-n-load is self isolating, meaning that the pH probe can be removed, even when there is fluid running through the pipework. This is fantastic if the process is critical and cannot be stopped, even to allow the pH electrode to be buffered.

When measuring the pH of a process that is contained within a pipe it can be tempting to thread the pipe and install a pH probe with the corresponding thread. This can sometimes cause difficulty when it comes to removing the probe, either for maintenance, replacement or for a standard calibration. For an easy way to remove the pH sensor we recommend using one of our inline pH electrode systems. We have the PES-1-QR assembly for 3/4" pipework and the PES-2-QR inline pH electrode system for larger diameter pipes. These two systems are solvent welded into the pipework, or they can be supplied with threaded connections on request, to form an integral part of the pipework. Then when it's time to remove the pH electrode and the pipework has been drained and isolated, the pH electrode is removed from the inline electrode system using the quick release fitting. This takes a matter of minutes for easy maintenance.

Alternatively - we have the Lock 'N' Load retractable inline pH electrode system. This system is sealed from inside the end cap, so the retracting section of the Lock 'N" Load won't fly off under pressure and it also creates a seal with the pipework. When it's locked into place, the pH electrode can be removed without having to isolate and drain the pipework. It's a neat all-in-one-system, which means that there isn't a convoluted arrangement of ball valves or retaining cables, just a simple lift, twist and lock, to remove the electrode and carry out any maintenance.

Inline pH Electrode Systems



The PES-1-QR is an inline pH electrode holder designed to hold a pH electrode in place within pipework to give online pH measurements.

The PES-1-QR is designed to hold any of our standard length glass body pH electrodes and these can be easily removed for periodic calibration or buffering by a simple twist of the quick release mechanism.

The PES-1-QR makes reading a the pH value in pipework and absolute breeze!

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The PES-2-QR is a large diameter inline pH probe holder designed to hold a pH probe in place within a piece of pipework to give online pH measurements

The PES-2-QR is designed for large bore pipework with the standard version designed for use with 2" diameter pipework

Using our standard pH probe inserts the PES-2-QR makes reading the pH value as simple as possible. When it comes to removing the pH probe for periodic calibration or buffering, it's as simple as a twist of the wrist to remove the pH probe

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Lock N Load

Lock N Load

The Lock N Load is another of our inline pH electrode holders - but with a difference

The Lock N Load is designed to be self isolating - with no need for clumsy ball valves or chains.

The end cap ensures that the Lock N Load is isolated from the inside. So there is no need to isolate the pipework first, or even stop the process flow.

Simply twist the mechanism - lift the assembly - then lock it into place with a quarter turn and the electrode is removed from the process and the assembly is isolated. Now the pH electrode can be removed from the sleeve for calibration or buffering.

The Lock N Load is a beautifully designed inline electrode assembly with ease of use at the forefront.

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