pH Electrode Range
There is a secret for the accurate measurement of pH which is the use of a good pH electrode.
Firstly - there are a number of different terms used for a device which is used to measure pH. We break these down as follows:-
We use this term to broadly cover any type of device used to measure pH.
We reserve the term pH probe to mean our industrial housed pH sensors — if you're looking for either a submersion or inline type of pH sensor then please visit the pH probe section.
We reserve this term to mean a glass bodied pH sensor. These are often referred to as laboratory pH electrodes, or just pH electrodes and that's the term we use to differentiate the two types of sensor.
Now that we have identified that we're using a pH electrode as our pH sensor, the next part is selecting the right pH electrode. There is a bewildering choice of pH electrodes, where a differing or more aggressive application has resulted in a technical improvement on a basic pH electrode.
If we start with a glass bodied pH electrode as our standard base, we can then work out the different elements that are engineered for application specific pH measurement.
pH electrode reference
This is the porous material that allows the reference material inside the electrode to be in contact with the solution that we're measuring.
There are a number of types of reference junction for pH electrodes. Our standard reference is a circular reference that runs around the outside of the glass bulb. This type of reference is called a peripheric or annular junction. The other types available are separate reference junctions, which are very old fashioned, or a wick type reference junction.
An annular reference is porous; it doesn't block, has an even flow of reference material and is our preferred method of delivery of the reference material.
A wick type reference offers a cost saving over an annular reference and are perfectly acceptable in applications where the solution being measured won't block the wick junction.
pH electrode junction
A standard electrode will have a single junction allowing the reference material to be in contact with the solution. This is perfect for most applications as the response time is very quick, meaning any change to the pH measurement is accurately represented on a high quality pH controller.
The disadvantage is that some applications and some chemicals will result in electrode poisoning.
This is where the solution being measured reacts with the reference material (KCl solution derivative or polymer) or the Ag-AgCL (Silver-Silver-Chloride) electrode.
Using a double junction we have a barrier between the Ag-AgCl and the KCl. If you have this problem we would recommend looking at a double junction pH electrode.
Note - An alternative option is to use an electrode which has a calomel reference. Contact us for more information on this option.
pH electrode reference material
The reference material inside the pH electrode can vary too. The solutions we use are proprietary and we have a standard gel which is used for temperatures up to 60ºC and then high temperature gels which have been tested to 120ºC.
pH electrode glass, connectors and low conductivity
There are other elements affecting the ability of a pH electrode to work in some environments, and if you'd like to discuss pH electrodes in more detail please get in touch - we do love a good chat about pH electrodes!
Some other areas for consideration include the glass type. We have 5 different types of glass that we use; some specifically for measuring changes in pH value, others to prevent the leaching of materials in low conductivity solutions.
The body material is also a consideration - we standardise on glass, but we do offer epoxy bodied electrodes where cost is a concern.
Finally one key consideration is the connection type. We prefer to use a BNC connector on our electrodes, but we can manufacture tagged ends, spade types, and most electrode connection types. If in doubt - just get in touch!
pH Electrode Range
Our epoxy bodied pH electrode model 9015-10B is a cost effective pH electrode which offers precision readings.
The 9015-10B in designed to be used in non-aggressive environments, such as swimming pools, hydroponics applications, laboratory and light industrial environments.
Suitable for use at temperatures from 0 - 60ºC
The 9069-10B is a standard glass bodied pH electrode
The 9069-10B pH electrode is glass bodied and has a single junction, ryton flared cap, 10 feet of connecting cable and offers precision measurement
Designed for laboratory or light industrial use where precision pH measurement is paramount.
Operating temperature of 0 - 60ºC
Sealed Combination pH electrode model 9093-10B with single junction and our standard peripheric non-fouling reference junction
The 9093-10B can stand a higher temperature than most standard electrodes with a reference solution rated up to 100ºC.
Designed for tough industrial applications and maintains a precise pH reading. Its also compatible with our industrial inline pH electrode holders
Sealed Double Junction pH electrode model 9092-10B.
The double junction design is for use in applications where the measured compound can react with silver. Specifically the silver-silver-chlorine (Ag-AgCl) reference. The sealed double junction is designed to prevent this from happening, which is known as electrode poisoning.
The 9092-10B combines precision measurement, excellent repeatability, non-fouling, is resistant to electrode poisoning and is rated up to 100ºC
This electrode is designed for harsh applications
Low conductivity pH electrode model 9072-10B
Specifically designed for applications involving low conductivity water.
With a low special low impedance electrode and over-sized domed glass bulb for precision readings in low conductivity water applications.
Even with a low conductivity solution the 9072-10B offers precision measurement, excellent repeatability, non-fouling, resistant to electrode poisoning and electrode leaching even in low conductivity water environments.
While this electrode is excellent at low conductivities water applications, it does offer a lower pH reading range and a reduced temperature, being rated for use between a pH range of 0 - 11pH and suitable for a temperature of 0 - 50ºC
High Temperature pH Electrode Model 9044-10B
Designed specifically for use where the solutions can get very hot - the 9044-10B uses a gel based reference to resist high temperature.
The double junction resists electrode poisoning and offers precision measurement, excellent repeatability, non-fouling reference even in high temperature applications.
Rated for temperatures from of 0 - 120ºC
Replacement pH Electrode Model 9392-10B acts as a replacement for our retractable inline lock-n-load systems
The 9392-10B is a sealed combination double junction replacement electrode with standard glass bulb.
Available with a stainless steel sheath for use with he stainless steel lock-n-load electrode system
This special replacement electrode is long bodied for use with the lock-n-load and is supplied with 3 metres of connecting cable
Suitable for temperatures from 0ºC to 100ºC
High Alkaline pH Electrode 9037-10B is designed to accurately measure the upper pH ranges right up to 14.00pH
Normally at this range - sodium ion error occurs giving a false pH reading, the 9037-10B is one of very few electrodes that accurately read at this range.
The reference is a special gel material and glass bulb is a unique dome shame for precision measurements above 12 pH.
The range is limited to readings between 2 - 14 pH and and suitable for a temperature from 0 - 100ºC
Rugged pH electrode model 9060-10B is a newer model for us.
With an epoxy bodied sealed combination electrode with rugged pH glass and tuff tip magna-flow reference junction more commonly seen in our industrial pH probe range
The tuff tip and rugged flat pH glass is designed to minimise the chance of electrode breakage while maintaining precision measurement, excellent repeatability, it doesn't foul and it's ideal for laboratory or industrial applications.
Suitable for a range of 0 - 13 pH and a temperature of 0 - 100ºC
Our cost effective epoxy bodied model 9015 only fitted with a PG13.5 thread and an S8 connector.
Still great for swimming pool applications, hydroponics, and light industrial applications and is a great low cost PG13.5 threaded pH electrode.
Suitable for use at temperatures from 0 - 60ºC
Overall An excellent pH electrode where having a PG13.5 thread and S8 connector is a must.