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Ion-Selective
Electrodes |
Mini ISEs |
Reference Electrodes |
pH Electrodes |
D.O. Electrodes |
Electrode Heads
ELIT
Ion-Selective Electrodes (ISE)
At the heart of ELIT Electrochemical Measuring Systems
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Want to Learn More About ISEs ? Scroll down (or press down arrow or "Page Down" Key) to see introductory text and diagrams. Also see our Information and Education pages |
![]() CLICK PICTURE FOR ENLARGEMENT AND EXPLANATION | Use ELIT plug-in all-solid-state |
Click any ion name below for electrode specifications and descriptions of methods
for measuring ion concentrations in aqueous solutions.
Ammonium |
Barium |
Bromide |
Cadmium |
Calcium |
Chloride |
Copper |
Cyanide |
Fluoride |
Iodide |
Lead |
Mercury |
Nitrate |
Nitrite |
Perchlorate |
Potassium |
Silver |
Sodium |
Sulphide |
Thiocyanate |
(Sulphate) |
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Click Here for a summary table of specifications for all ELIT ISEs.
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The main advantages of Ion-Selective Electrodes are:
Note: ISEs are not generally used as precise analytical tools. Nevertheless, routine, rapid measurements can usually be expected to have an accuracy of around ± 10% and with careful analysis under ideal conditions some can achieve an accuracy and precision of better than ± 2% (1-sigma) - see chapter on Accuracy and Precision in our Beginners Guide to ISE measurements. Ion-Selective
Electrodes measure the activity (or effective concentration)
of ions in a solution, rather than the actual concentration; the activity is always less than
the concentration because of
Other Essential (included) Components of an ELIT Ion Analyser:
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ELIT ion selective electrodes These electrodes have a solid state membrane and a solid internal contact - i.e. they do not contain any liquid or gel electrolytes. Their characteristics and advantages are:· Simple gold-plated plug-in connectors. · Robust and Durable. · Easy to handle. · Stable electrochemical potential. · Fast response time. · Function in any position. · No leaking of fluids. · Long shelf life and working life. · Can be stored and transported below 0°C. |
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The ELIT Electrode Head System
ELIT Electrode Heads are manufactured
from a robust plastic material and fitted with low noise cables and
connectors which are compatible with any standard mV/pH/ion meter. Advantages of this 'electrode combination' over conventional combination electrodes:
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Six types of ELIT Heads are currently available:
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ELIT Mini ISEs Nico2000 Ltd can also supply Mini ISEs with a range of tube diameters and lengths for special applications. These electrodes are fitted with a simple wire connector to allow maximum flexibilty for connecting to other equipment and are not suitable for use with the ELIT electrode head system.
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ELIT Reference Electrodes
These electrodes are of a robust design
with PVC bodies and gel electrolytes. Leak rates are very low and the electrolytes do not
require replacing, therefore these electrodes are manufactured as maintenance-free sealed units which should have an active (or shelf) life of several years - provided that the porous frit is kept moist by immersing in a solution with the same composition as the gel electrolyte when not in use. This is normally done by keeping a few drops of solution in the protective black plastic cap which must always be replaced when the electrode is not in use. | ||||||||||||||||||||
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ELIT pH Electrodes
ELIT pH electrodes are of a robust, conventional design, with glass membrane, re-fillable liquid electrolytes and AgCl reference system. They are basic combination electrodes for checking that the pH is in the correct range for the ISE to work properly and do not require a separate reference system. They are fitted with cable and DIN connector for connection to any measuring system and do not require an ELIT electrode head connector. | ||||||||||||||||||||
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ELIT Dissolved Oxygen Electrodes Nico2000 can supply two polargraphic type dissolved oxygen electrodes and one galvanic type. All are designed for laboratory measurements and have a standard 12mm body diameter. Two versions of the polargraphic electrode are available. In air-saturated water (20.9% Oxygen), one has an output current of 600nA, the other 60nA. The output of the galvanic electrode at saturation is 33-40mV. The residual output in zero oxygen solutions for all the electrodes is less than 1% of the output in saturated water. One or two A.T.C. sensors (Thermistor or Pt100/1000) may be fitted to customers specific requirements. Replacing the Teflon membrane is quick and easy. Simply unscrew the old assembly, load the new one with fill solution and screw on to the electrode. The electrode is supplied complete with 2 membrane assemblies and a 50 ml bottle of filling solution. A 50ml bottle of Zero Oxygen solution is available for calibration
purposes.
When ordering please specify: A Length of cable required in metres
e.g. 601/2/Th10k/5pin DIN. = 601 with 2m cable, 10k Thermistor A.T.C. and 5 pin DIN Connector |
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CCR - - - Nico2000 Ltd - - - Last Update: 23 September 2007