Teledyne 2010A - Split architecture thermal conductivity analyzer - Manual (Page 54)

4 Operation Model 2010A
4-20 Part I Teledyne Analytical Instruments
the next lower range, the instrument switches to the lower range. A correspond-
ing shift in the DC concentration output, and in the range ID outputs, will be
noticed.
The autoranging feature can be overridden so that analog output stays on a
fixed range regardless of the contaminant concentration detected. If the concen-
tration exceeds the upper limit of the range, the DC output will saturate at 1 V dc
(20 mA at the current output).
However, the digital readout and the RS-232 output of the concentration
are unaffected by the fixed range. They continue to read beyond the full-scale
setting until amplifier saturation is reached. Below amplifier saturation, the
overrange readings are accurate UNLESS the application uses linearization over
the selected range.
The concentration ranges can be redefined using the Range function
Manual screen, and the application gases can be redefined using the System
function, if they are not already defined as necessary.
CAUTION: Redefining applications or ranges might require
relinearization and/or recalibration.
To setup automatic ranging:
Press Range key to start the Range function.
Select range
mode : AUTO
Note: If all three ranges are currently defined for different applica-
tion gases, then the above screen does not display (because
mode must be manual).
If above screen displays, use the
Δ∇ arrow keys to Select AUTO, and
press Enter.
Press Escape to return to the previous Analyze Function.