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Teledyne API Model 200AU NO
X
Analyzer Instruction Manual, 02293, Rev. F
9-7
Table 9-1: Test Functions (Continued)
Test Function Factory Set-Up Comment
MOLY TEMP
315
±
5° C
Moly temp is controlled by the CPU to 315° C. After cold start it
requires about 30 min to come to temperature. After temperature is
reached temperature should not vary more than
±
5° C. See
Section 9.3.4 for troubleshooting. Warning limits are < 290° C and
> 320° C.
RCEL PRESS
3.5
±
1 in-Hg-A
RCEL is the pressure in the Reaction Cell. The instrument is very
sensitive to variations in reaction cell pressure. A 10% change in
output per 1"Hg pressure is typical. The pressure reading will
change when the NO/NO
x
and Pre-reactor valves switch,
otherwise it should remain constant. The reaction cell pressure
will be lower at higher altitude due to lower pump back-pressure.
Pressures higher than the acceptable range will decrease
instrument noise performance and sensitivity.
SAMP PRESS 29.5"Hg at sea
level
The sample pressure is taken upstream of the reaction cell. It
usually runs about 0.5" less than ambient pressure due to the
restrictions in the sample intake tubing. Sample pressure should be
within
±
1"Hg of atmospheric pressure. The pressure sensor used
reports absolute pressure and therefore is sensitive to altitude,
weather fronts, and room air conditioning. Changes due to altitude
is about 1" per 1000 ft., other changes are
±
0.4" maximum.
Pressurizing the sample inlet will cause the M200AU to be noisy
and to shift its reading.
SLOPE
1.0
±
0.3
This is the software slope value. It operates like a software gain
pot. Refer to Table 7-18 on Calibration Quality for additional
information.
OFFSET 0 – 10, +150 This is the software offset value. It operates like a software DC
offset pot. Refer to Table 7-18 on Calibration quality for
additional information.
TIME HH:MM:SS This is the time of day clock readout. It is used to time the
AutoCal cycles. The speed of the clock can be adjusted by the
CLOCK_ADJ variable in the VARS menu. The clock can be set
via SETUP-CLOCK-TIME from the front panel.