Teledyne 3020T operating instructions Fixed Range Analysis

Trace Oxygen Analyzer Operation 4

Use the DOWN/UP control to enter the upper value of the range (all ranges begin at 0 ppm). Repeat for each range you want to set. ENTER to accept the values and return to the Analysis Mode. (See note below.)

Note: The ranges must be increasing from low to high, for example, if range 1 is set as 0–100 ppm and range 2 is set as 0–1,000 ppm, range 3 cannot be set as 0–500 ppm since it is lower than range 2.

Ranges, alarms, and spans are always set in ppm units (over the entire 0-250,000 ppm range), even though all concentration-data outputs change from ppm units to percent when the concentration is above 10,000 ppm.

After defining your analysis ranges, set Mode– to either AUTO or one of the fixed ranges, as described below.

4.10.2 Fixed Range Analysis

The autoranging mode of the instrument can be overridden, forcing the analyzer DC outputs to stay in a single predetermined range.

To switch from autoranging to fixed range analysis, ENTER the

RANGE function by selecting RANGE from the MAIN MENU.

Use the DOWN/UP	control to move AUTO between the arrows.
Use the DOWN/UP	control to switch from AUTO to FX/LO, FX/MED,

or FX/HI to set the instrument on the desired fixed range (low, medium, or high).

L—100	M—1000
H—10000	Mode—FX/LO

	or
L—100	M—1000
H—10000	Mode—FX/MED
	or
L—100	M—1000
H—10000	Mode—FX/HI

ESCAPE to re-enter the ANALYZE screen using the fixed range.

NOTE:When performing analysis on a fixed range, if the oxygen concentration rises above the upper limit, as established by the setup, for that particular range, the output saturates at 1 V dc (or 20 mA). However, the digital readout and the RS-232

Teledyne Analytical Instruments 4-17