Teledyne 9110AH - Nitrogen oxides analyzer - Manual (Page 60)

TELEDYNE Model 9110AH NO
X
Analyzer Operator Manual, 01620, Rev. F
5-18
5.3.4 Range Menu
The instrument operates on any full scale range from 5 to 5,000 ppm. The range is the
concentration value that equals the maximum voltage or current output on the rear panel of the
instrument.
If the range you select is between 5 and 500 ppm the front panel will read the concentration
anywhere from 0 to 500 ppm regardless of the range selected. If the range selected is from 501
to 5,000 ppm the front panel will read from 0 to 5,000 ppm. The apparently wider range of
front panel readouts is because the M9110AH has 2 internal hardware ranges, namely 0-500
ppm and
0-5,000 ppm. The analog output is scaled for the range selected, however the front panel
reading can display correct concentrations over the entire physical range.
NOTE
Only one of the following range choices can be active at any one time.
There are 3 range choices:
1. Single Range
2. Auto Range
A. Remote Range
3. Independent Ranges
5.3.4.1 Single Range
This range option selects a single range for all output channels (NO, NO
x
, NO
2
) of the
M9110AH. To select Single Range press SETUP-RNGE-MODE-SING, then press ENTR. To set
the value for the range press SETUP-RNGE-SET, and enter the full scale range desired from 5
ppm to 5,000 ppm.
5.3.4.2 Auto Range and Remote Range
Auto Range allows each of the 3 output signals (NO, NO
x
, NO
2
) to automatically range between
a low value and a higher value. The Hi range mode is signaled by a bit on the STATUS
connector see Table 5-8. When the instrument output increases to 98% of the low range value it
will Auto Range into Hi range. In Hi range, when the output decreases to 75% of low range it
will change to the lower range. If you select a Hi range that is less than Low range, the
M9110AH will remain locked in Low range and behave as a Single Range instrument.