Trace Oxygen Analyzer
Operation
Teledyne
Analytical
Instruments
51
However, the digital readout and the RS-232 output of the
concentration are unaffected by the fixed range. They continue to read
accurately with full precision. See
Front Panel
description in Chapter 1.
The automatic air calibration range is always 0-25 % and is not
programmable.
4.10.1 Setting the Analog Output Ranges
To set the ranges, ENTER the
RANGE
function mode by selecting
RANGE
from the MAIN MENU. The
RANGE
screen appears.
L—100 M—1000
H—10000 Mode—AUTO
Use the DOWN/UP control to the range to be set: low (
L
), medium
(
M
), or high (
H
).
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 0–1000 ppm, range 3 cannot be set as 0–500 ppm
since it is lower than range 2.
4.10.2 Automatic Ranging
After defining your analysis ranges, set
Mode–
to
AUTO
, if not
already there. ESCAPE to re-enter the ANALYZE screen using the
fixed range.
4.10.3 Fixed Range Analysis
The auto-ranging mode of the instrument can be overridden,
forcing the analyzer DC outputs to stay in a single predetermined range.
To switch from auto-ranging 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.