Hi, 

I also look for a way to get rid of the "time for calibration" nag screen when I start up the JM-105.

Busy signal appeared whenever it is used and Circuit error shown

Equipment: Draeger - JM-105

Hi guys,

I replace my batteries on a 3 year basis on these units as well as checking on the validity of the self-test measurements using the test disk under the charging base cover.  I cannnot find any information on resetting the annoyance alarm when you turn on the unit stating "Time for periodic Calibration".  I was told by Drager that calibration is only required if the user test of the three values falls outside of normal values.  That and the battery being replaced on a schedule is the extent of the PM for these units.  I do not have equipment to calibrate these units, so I rely on the operator self-check using the disk as the reference source.  

Does anyone know how to reset the unit so the annoyance alert will not appear?

mrstan