Oximat 61 - Caliration support

Dear Expert,

i am using Oximat 61 for our system, when try to calirate device, i got a problem:

- We used oxigen 12.5% for calibration, setpoint was 12.5%, nitrogen for zero: Oximat 61 couldn't read detect setpoint value.

- the value of the analyzer during calibration was not stable, fluctuates greatly.

- Then we had to press OK to finish caliration process.

- Then we measured sampler gas, reading value exceed to +-300 %

Could you please give me some advices if the caliration was wrong or device has problem.

attached link some pictures and videos:

VIDEO - HÌNH ẢNH

Thank you