Why do we use Kemio Check Standards and why have we removed Stage 4?


Check standards are used to determine if an instrument is still within calibration.

Kemio check standards verify that the instrument correctly measures electric signals. As with electrochemical sensors in samples, the Kemio 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.

When testing a sample, Kemio automatically detects the optimum measurement range by switching between sensitivity stages. Each test parameter and corresponding sensor is calibrated to deliver results from the required sensitivity ranges. As Palintest sensor products are only measured using Sensitivity Ranges 1-3 and their performance is validated through check standards S1-S3, no existing test parameters or sensor calibrations require access to sensitivity range S4. Therefore, for your convenience, we have removed the need to validate with the Check Standard 4.

As a result, Check Standard S4 will no longer be requested during Check Standard Mode measurements and will no longer be supplied with the Kemio instrument. Our firmware has been updated to reflect these changes and can be downloaded from our website here.

Palintest will continue to calibrate Check Standard S4 during manufacture, however all measurements will be limited to sensitivity ranges Stages 1 to 3 and Stage 4 will be reserved for future developments.

If you would like to learn more or have questions related to Kemio, please get in touch with our technical team here.


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