The CAL FAIL error indicates that there was a problem with your tube calibration. Firstly, we would recommend checking that the correct gas and concentration has been used, that the gas cylinder is switched on and has been connected to the instrument for the duration of the calibration procedure. Please ensure that the tube holder grub screw is installed when using a demand flow regulator, and that this is removed when using a flow regulator. Please also ensure that the correct temperature is selected during the calibration. It may be that the instrument requires MiniPID maintenance such as electrode stack replacement or lamp cleaning. Please try recalibrating the instrument again.
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