Teledyne 9110EH - Nitrogen Oxides Analyzer - Manual (Page 70)

Operating Instructions Model 9110EH Instruction Manual
6.5.5. Auto Range Mode (AUTO)
In AUTO range mode, the analyzer automatically switches the reporting range between two
user-defined ranges (low and high). The same low and high span settings are applied
equally to NO, NO
2
and NO
X
readings. The unit will switch from low range to high range
when either the NO, or NO
X
concentration exceeds 98% of the low range span. The unit will
return from high range back to low range once both the NO and NO
X
concentrations fall
below 75% of the low range span.
In AUTO range mode 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
(Section 6.9.1). To set individual ranges press the following keystroke sequence.
SAMPLE RANGE = 500.0 PPB NOX=X.X
< TST TST > CAL SETUP
SETUP X.X PRIMARY SETUP MENU
CFG DAS RNGE 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: AUTO
SNGL DUAL AUTO ENTR EXIT
SETUP X.X RANGE CONTROL MENU
MODE SET UNIT EXIT
SETUP X.X HIGH RANGE: 500.0 Conc
0 0 5 0 0 .0 ENTR EXIT
SETUP X.X LOW RANGE: 500.0 Conc
0 0 5 0 0 .0 ENTR EXIT
Toggle the numeral
keys to set the
LOW and HIGH
range value.
ENTR accepts the
new setting, EXIT
ignores the new
setting.
NOTE
Low and high ranges have separate slopes and offsets for computing the NO and
NOx concentrations. Hence, the two ranges must be calibrated independently.
6.5.6. Range Units
The M9110EH can display concentrations in parts per billion (10 9
mols per mol, PPB), parts per
million (10 6 mols per mol, PPM), micrograms per cubic meter (µg/m 3 , UG) or milligrams per
cubic meter (mg/m 3 , MG). Changing units affects all of the display, COM port and iDAS
values for all reporting ranges regardless of the analyzer’s range mode. To change the
concentration units:
56 M9110EH Rev 0