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Operating Instructions Teledyne API Model T360/T360M Operation Manual
100
4.8.5. Auto Range Mode (AUTO)
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 automatically switch to show which range is in effect.
The high/low range status is also reported through the external, digital status
outputs (Section 4.15.1).
To set individual ranges press the following me
nu button sequence.
SAMPLE* RANGE = 500.000 PPM CO2 =X.XXX
< TST TST > CAL SETUP
SETUP X.X
PRIMARY SETUP MENU
CFG DAS RNG
E
PASS CLK MORE EXIT
SETUP X.X RANGE CONTROL MENU
MODE
SET UNIT EXIT
SETUP X.X RANGE MODE: SNGL
SNGL DUAL AUTO ENTR EXIT
EXIT x 2 returns
to the main
SAMPLE display
SETUP X.X RANGE MODE:
A
UT
O
SNGL DUAL AUTO ENTR EXIT
SETUP X.X RANGE CONTROL MENU
MODE
SET UNIT EXIT
SETUP X.X HIGH RANGE: 500.0 Con
c
0 0 5 0 0 .0 ENTR EXIT
SETUP X.X LOW RANGE: 500.0 Con
c
0 0 5 0 0 .0 ENTR EXIT
Toggle the numeral
buttons to set the
LOW and HIGH
range value.
ENTR accepts the
new setting, EXIT
ignores the new
se tting.
NOTE
In AUTO range mode the LOW and HIGH ranges have separate slopes and offsets for computing
CO2 concentration. The two ranges must be independently calibrated.
NOTE
Avoid accidentally setting the low range of the instrument with a higher span limit tha The high
range. This will cause the unit to stay in the low reporting range perpetually and defeat the
function of the AUTO range mode.
07272B DCN6552