clean chamber and calibration

cleaning chamber
flow check
calibration ok, with new following setting saved into the neph:
channel 1 : span 10.001, zero -1.55, stability 97.088

channel 2: span 24.623, zero 0.657, stability 96.756

channel 2: span 45.582, zero 0.4547, stability 96.852
Zero frequency and duration to be changed