OPERATING MANUAL OXYGEN MONITORING SYSTEM
OMS 420
34
9.7.7
Adjustment O2 cell amplifier (by factory only)
PREV or NEXT
move cursor
EDIT
change value by means of UP/DOWN and POS
OK
save
values
BACK
return to calibration menu
This procedure is required only when a new O
2
cell is installed.
Source a precision voltage device to the input connectors of the O
2
cell signal (see picture below) and select
-10mV for offset trim
and
+100mV for span trim.
If actual values displayed are other than -10mV to +100mV setting can be adjusted by selecting “Set offset” or “Set span” and
editing and replacing the displayed numbers with the actual numbers.
Factory default = factory adjusted values
ATTENTION:
Changes of these factors require new gas calibration. Only authorized persons or manufacturer’s trained technicians are authorized
to perform adjustments on the OMS420.
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