Teledyne 3290 - OEM percent oxygen analyzer - Manual (Page 34)

Operation Model 3290
Teledyne Analytical Instruments 24
4.2 Using the Function and Data Entry Buttons
When no buttons on the Analyzer are being pressed, the instrument
is in the Analysis mode. It is monitoring the percent of oxygen in the
sample gas that is flowing through the remote probe.
When one of the function buttons is being pressed, the Analyzer is
in the Setup mode or the Calibration mode.
The 4 Setup function buttons on the analyzer are:
 SET HI ALARM
 SET LO ALARM
 SET HI RANGE
 SET LO RANGE
The Calibration mode button is:
 SPAN
The data entry buttons (  and ) increment the values displayed on
the PERCENT OXYGEN meter while one of the function buttons is
being held down.
  : Increments the displayed value upwards.
  : Increments the displayed value downwards.
Any of the functions can be selected at any time by holding down
the appropriate button.
Each function will be described in the following sections. Although
the operator can use any function at any time, the order chosen in this
manual is appropriate for an initial setup.
4.3 Setting the Analysis Ranges
The two user definable analysis ranges are both capable of being
adjusted from 0-1% to 0-25% oxygen concentration. When in the auto
ranging mode, regardless of the user-defined values that have been set,
the analyzer will automatically switch from the LO range to the HI range
when the oxygen concentration reaches 100% of the LO range fullscale
value, and will switch back to the LO range when the oxygen
concentration reaches 85% of the LO range fullscale value.