Shop Electrodes by Application
Our products can be used in a wide range of applications. Our electrodes are manufactured accurately with first-class engineering and are ideal for quality results in various applications.
FAQs
General and Ordering
Can we visit?
Please get in touch to arrange a visit to our production facilities in Essex.
Which electrodes can I buy online?
We have a range of pH, conductivity, reference and Ion Selective Electrodes for delivery within 2-3 working days or made to order in 4-6 weeks.
Click here to see the range on fast delivery.
What if I need an electrode that you don't list in your catalogue/website?
Please get in touch – we can make custom electrodes to fit most requirements.
Do your electrodes have a CE mark?
Our electrodes do not require a CE mark.
Does my electrode come with a warranty?
See the linked Product Warranty PDF.
Can you ship orders overseas?
We can ship worldwide. To order for shipping outside the UK, use the Enquiry Basket, or contact the team and we’ll provide a quotation including shipping charges for your location.
Product Preparation and Care
How should I prepare my electrode for use?
Carefully remove the electrode from the packaging and remove the protective rubber or plastic protective “boot” from the tip. Some plastics can leave deposits on the sensing tip which will result in a slow response. Every effort is made to make sure this does not happen, but if you suspect this, then wipe the tip with a tissue soaked in propanol or soak the electrode in cleaning solution (791-15) for an hour.
View our Unboxing your Electrode How To video for more information.
How do I store my pH electrode?
For short term storage, soak the electrode in storage solution (791-65). If this is not available, HCL at pH4 would be ideal. DO NOT store in DI water or pH buffer. Use tap water if nothing else is available.
How do I clean my electrode?
You can clean the tip of the electrode with a tissue soaked in propanol then place in pH buffer to rehydrate. To remove proteins of sample deposits, soak in cleaning solution (791-15) for 1-2 hours.
If working with food or blood products store the electrodes over-night in cleaning solution.
How long will my electrode last?
This is application dependant. Using in clean water based samples will result in a lifetime of years.
Food products will result in a shorter life of around 6 months if cleaned properly.
Aggressive chemicals and processes vary quite a lot, but electrodes should have a consistent lifetime.
How do I tell if my pH electrode need replacing?
Set your instrument to absolute mV mode and place the electrode om pH7 buffer. If the reading is greater than ± 30mV, then the electrode may be getting towards the end of its life.
When calibrating between 7 and 4 pH buffers a new electrode should have a slope greater than 95%. If this reading is less than 90%, the electrode may need replacing. (Soaking in cleaning solution may help)
Technical Queries
There is a black rubber cover on my Ion Selective Electrode, what is this for?
The black cover over the hole is for refilling the probe, should not really ever be necessary as the type of electrolyte used should last for the entire working life of the sensor, however it can be replaced if required.
How often should Ion Selective Electrode standards be changed?
pH buffer solutions are usually made up of a chemical that can acts as both an acid and a base so this means they can resist a change when something else is added to the solution, so it can buffer itself for a while to stay roughly at the same pH. ISE standards are not buffers so they cannot do this and will become contaminated very easily. This is why we only supply 1000ppm once you are getting to the lower strength standards these will be at a much higher risk of contamination. Anything below 10ppm should be made up on the day of use if possible.
Should I really store my Ion Selective Electrode dry? Not immersed in any solution?
Whilst storing dry is good for the ISE membrane it does lead to the junction drying out therefore it should be preconditioned for approximately 30min to an hour before use by soaking the probe in the lowest strength calibration standard you intend on using. For example, if you are expecting a measurement of say 50ppm you would calibrate using 10ppm and 100ppm – You would therefore soak your probe in 10ppm calibration standard for an hour prior to calibration. If preconditioning is missed your response may be slower than expected, you will have a higher noise to signal and as your probe soaks through and the impedance drops your calibration will no longer be the same.
How often should I calibrate my Ion Selective Electrode?
We would recommend calibrating the probe daily as a minimum, ISE membranes response will change and drift regularly (Max 2mV per day) so the more often you calibrate the better.
My electrode has crystallised electrolyte around the refill seal, is this normal?
Crystallised electrolyte around the refill seal is completely normal. Simply wipe this off with lint free paper and deionized water before use or refilling.
There are bubbles in the electrode bulb, what shall I do?
It is recommended to inspect that the glass bulb is completely filled with electrolyte and that there are no visible air bubbles before each use.
If bubbles are present, shake the electrode in a downwards fashion like a clinical thermometer.
How do I calibrate my electrode?
Please refer to the Calibration Instructions document. Or watch our ‘How to calibrate your electrode in lab’ for more information.
My new electrode will not calibrate, what can I do?
It is important to make sure the inner stem is free from bubbles. If they are present, shake the electrode in a downwards fashion like a clinical thermometer.
See additional instructions for P19 and P19 knife electrodes.
Need to chat with us?
Speak to one of our specialist technicians for expert advice