Dear Colleagues,

We have 2 Corona CAD detector for HPLC system, one works well, but the other shows a Flow/Ratio error message at test run.
Tried to adjust the 2 screw (one at the nebuliser, the other at the exhaust), but no flow detected.
I changed several parts between the two devices and it seems that someone changed the pressure sensors but did not perform the calibration.
No other error messages, all self tests pass.

Can someone help me how to calibrate the pressure gauges (service instruction / service menu)? Or for later models?