At Palintest, we pride ourselves on the level of support that we offer to our customers.
We recognise that on occasion you may need our support to get the best from your Palintest equipment. Our website is full of useful information about testing with Palintest instrument.
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If the Check Standard readings indicate that the instrument is ‘out of calibration’ there are a few things you can try prior to arranging servicing/ recalibration of the instrument.
We would recommend that you carefully clean the photometer, especially the cell holder and optical windows, using a soft cloth and antistatic foam cleaner. Once this has been thoroughly cleaned, try re-reading the standards.
Please also carefully check the following:
If these are not correct, we would recommend first obtaining a new set of check standards for your instrument.
Failing this, please contact Palintest or your local Palintest Distributor to arrange for servicing and recalibration of your instrument.
Important: If returning an instrument to our service department please let us know that the instrument is incorrectly reading the check standards with details of the part and serial numbers of the standards and which of them is failing to read correctly
Lumiso works like other photometers, by measuring the amount of light that passes through the sample in comparison to the blank. This is known as the “Percentage Transmission” or “%T”. This %T value is mathematically converted by the software to a mg/L concentration.
Therefore, to verify that the instrument is performing within calibration it is only necessary to check that the instrument measures correct values of %T at each wavelength of light it uses. If the instrument is reading the %T value correctly according to the certificate, the correct mg/L value will be displayed when testing.
Error messages usually indicate that your photometer has detected something that might affect the result of a test. Some error messages are a warning and will still allow you to perform tests. For others, the error will be considered critical and the instrument will prevent a test being performed.
Please check your instrument’s User Manual for details of what the error message means.
Check standards are used to determine if an instrument is still within calibration.
Photometers work by sending light through the sample, check standards for these instruments are usually either Coloured Solutions or Neutral Density Filters (NDF). Both types have known and certified transmittance or absorbance values so they should give these values when read in a photometer. To make the checking process even simpler some instruments will convert these to a parameter such as chlorine and give the value mg/L. The ‘target’ value is on the certificate supplied with the set of Check Standards.
Kemio and sensor instrument check standards verify that the instrument correctly measures electric signals. As with electrochemical sensors in samples, the instrument applies a voltage to the check standard and measures the resulting current. Check standards include verified resistors, which produce a consistent electric current. Kemio validates the measured current internally. Sensor instruments display the corresponding concentration value, which is compared manually to target values on the certificate supplied with the set of check standards. Check standard kits come with four standards to test across the measurement range.
Check standards allow you to confirm that your instrument is reading results correctly.
The recalibration process is a highly technical process which is carefully controlled. To recalibrate your instrument, it must be returned to Palintest. Contact your Palintest representative for more information.
14th January 2021
To support accurate pool and spa testing even further Lumiso features new and improved check standards.
8th December 2020
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