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Teledyne API - Model 200EH/EM Operation Manual Operating Instructions
57
6.2. SAMPLE MODE
This is the analyzer’s standard operating mode. In this mode, the instrument is analyzing NO and NO
X
and
calculating NO
2
concentrations.
6.2.1. TEST FUNCTIONS
A series of test functions is available at the front panel while the analyzer is in SAMPLE mode. These
parameters provide information about the present operating status of the instrument and are useful during
troubleshooting (Section 11.1.2). They can also be recorded in one of the iDAS channels (Section 6.7) for data
analysis or output on one of the configurable analog outputs.
Table 6-2: Test Functions Defined
DISPLAY PARAMETER UNITS
DESCRIPTION
Analog output
range
configuration
A1:NXCNC1=100 PPM
A2:N0CNC1=100 PPM
A3:N2CNC1=25 PPM
A4:NXCNC2=100%
These functions show the default settings for the enabled analog
output channels. See section 6.13.4 for more information.
NOX STB STABILITY PPM, MGM
The stability is a standard deviation of the NO
X
concentration over 25
samples, each recorded every 10 seconds. A low NOX STB value
indicates low variability in NO
X
.
SAMP FLW SAMPLE FLOW cm³/min (cc/m)
The flow rate of the sample gas through the reaction cell. This value is
not measured but calculated from the sample pressure.
OZONE FL OZONE cm³/min (cc/m) Flow rate of the O
3
gas stream as measured with a flow meter
PMT PMT Signal MV The raw output voltage of the PMT.
NORM PMT
NORMALIZED PMT
Signal
MV
The output voltage of the PMT after normalization for auto-zero offset and
temperature/pressure compensation (if activated).
AZERO AUTO-ZERO MV
The PMT signal with zero NO
X
,
which is usually slightly different from 0 V.
This offset is subtracted from the PMT signal and adjusts for variations in
the zero signal.
HVPS HVPS V The PMT high voltage power supply.
RCELL TEMP REACTION CELL TEMP
C
The current temperature of the reaction cell.
BOX TEMP BOX TEMPERATURE
C
The ambient temperature of the inside of the analyzer case.
PMT TEMP PMT TEMPERATURE
C
The current temperature of the PMT.
IZS TEMP IZS TEMPERATURE
1
C
The current temperature of the internal zero/span option. Only appears
when IZS option is enabled.
MOLY TEMP CONV TEMPERATURE
C
The current temperature of the NO
2
converter.
RCEL
REACTION CELL
PRESSURE
in-Hg-A
The current gas pressure of the reaction cell as measured at the vacuum
manifold. This is the vacuum pressure created by the external pump.
SAMP SAMPLE PRESSURE in-Hg-A
The current pressure of the sample gas as it enters the reaction cell,
measured between the NO/NO
x
and Auto-Zero valves.
NOX SLOPE NO
x
SLOPE - -
The slope of the current NO
x
calibration as calculated from a linear fit
during the analyzer’s last zero/span calibration.
NOX OFFS NO
x
OFFSET MV
The offset of the current NO
x
calibration as calculated from a linear fit
during the analyzer’s last zero/span calibration.
NO SLOPE NO SLOPE - -
The slope of the current NO calibration as calculated from a linear fit
during the analyzer’s last zero/span calibration.
NO OFFS NO OFFSET MV
The offset of the current NO calibration as calculated from a linear fit
during the analyzer’s last zero/span calibration.
NO2 NO
2
concentration
PPM, MGM The current NO
2
concentration in the chosen unit.
NOX NO
x
concentration
PPM, MGM The current NO
x
concentration in the chosen unit.
NO NO concentration PPM, MGM The current NO concentration in the chosen unit.
TEST TEST SIGNAL
2
MV Signal of a user-defined test function on output channel A4.
TIME CLOCK TIME hh:mm:ss The current day time for iDAS records and calibration events.
04521C (DCN5731)