4 & 8 Channel Ion Analysers

    • Enable automatic, continuous, simultaneous, monitoring of up to 8 Ion-Selective, pH, and/or Redox electrodes (in any combination) and up to 4 Temperature sensors, by direct connection to any Desk-top or Lap-top computer with Windows Operating System.
    • Up to 100,000 data points can be recorded.
    • Data can be displayed for each channel individually or in any combination of channels.
    • Sophisticated graphics tools permit wide range of data presentation and display.
    • Option to calibrate each channel separately when different electrodes are used, or similar channels simultaneously if the same type of electrode is required in more than one solution at 

    Modes of Operation:

    All multi-channel analyzers can be used in two configurations:


    1) For measuring in several different vessels simultaneously – each sensor electrode has its own separate reference electrode.


    2) For simultaneous multi-component analysis in a single vessel – all sensors use the same single reference electrode.


    However, it must be noted that there are several factors that must be taken into account before it is possible to say which ions can be measured simultaneously in the same solution using multichannel analysers. The most important point is that ISEs are not ion-specific. All are sensitive to some other ions to some extent. Therefore before designing a multi-channel measuring system it is necessary to know the expected composition of the sample ie: what is the expected concentration range of each of the ions to be measured and of any other ions which might interfere.

    The known interfereing ions for each ISE are given in the specification sheets (accessed via the list of ions on the home page) and a formula is given for calculating the likely magnitude of the interference from each ion. With this knowledge, a detailed study must be made to be sure that none of the target ions significantly interfere with each other and there are no other interferents which would have a significant effect on the result for the measured ions.

    The lower concentration limit must also be considered – the lower figure on the specification sheets is the detection limit but the limit for reasonably accurate measurements is normally several times this figure. Also note that each ISE has a specified pH range and any candidates for simultaneous measurement must all have pH compatibility. Lastly, it may not be possible to make multi-component analysis in an original sample if the total ionic strength of the sample is high – some pretreatment of a sub-sample and standards may be necessary.

    A discussion of these factors can be found here and it is strongly advised that these limitations are fully understood in order to make a realistic assessment of what ions are suitable for simultaneous measurement.

    If pH is required together with ISE then a standard combination pH electrode is used to provide the reference system for all the other mono-electrodes; i.e. no separate reference electrode is required – but note that this may not be suitable for ions where K and Cl are interferents, particularly at low concentrations, because of the possibility of contamination by K and Cl from the pH electrode.the same time.

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