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Teledyne API – Technical Manual - Model 300E Family CO Analyzers Basic Operation
103
6.6.3.3. RNGE MODE AUTO: Configuring the M300E/EM Analyzer for AUTO Range Mode
In AUTO range mode, the analyzer automatically switches the reporting range between two user-defined ranges
(low and high).
The unit will switch from low range to high range when the CO
2
concentration exceeds 98% of the low
range span.
The unit will return from high range back to low range once both the CO
2
concentration falls below 75% of
the low range span.
In AUTO Range Mode the instrument reports the same data in the same range on both the A1 and A2 outputs
and automatically switches both outputs between ranges as described above.
Also the RANGE test function displayed on the front panel will be replaced by two separate functions:
RANGE1: The LOW range setting for all analog outputs.
RANGE2: The HIGH range setting for all analog outputs.
The high/low range status is also reported through the external, digital status bits (See Section 3.3.3).
To set individ
ual ran
ges press the following keystroke sequence.
SETUP X.X
CFG DAS CLK MORE EXIT
SETUP X.X
SET UNIT DIL EXIT
SETUP X.X
SNGL DUAL DIL ENTR EXIT
SETUP X.X
SNGL DUAL AUTO EXIT
SETUP X.X
MODE UNIT DIL EXIT
SETUP X.X
Toggle these keys to
select the upper
limit for the
reporting range.
discards the new
setting.
accepts the
new setting.
SETUP X.X
The and
ranges have separate
slopes and offsets for
computing the CO
concentration.
The two ranges must
be independently
calibrated
.
Avoid accidentally setting the
range ( ) of the instrument
with a higher span limit than the
range ( ).
This will cause the unit to stay in
the low reporting range perpetually
and defeat the function of the
range mode.
04288D DCN5752