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Operating Instructions
Model 300E Carbon Monoxide Analyzer
Instruction Manual
54
P/N 04288 REV: A
Table 6–2: Test Functions Defined
Parameter
Display
Title
Units Meaning
Range
RANGE
PPB, PPM,
UGM, MGM
The Full Scale limit at which the output range of the
analyzer’s ANALOG OUTPUTS are currently set.
THIS IS NOT
the Physical Range of the instrument. See
Section 6.4 for more information.
Stability
STABIL
PPB, PPM
UGM, MGM
Standard deviation of CO Concentration readings. Data
points are recorded every ten second. The calculation uses
the last 25 data points.
CO Measure
CO MEAS
MV
The demodulated, peak IR Detector output during the
MEASURE portion of the CFG Wheel cycle.
CO Reference
CO REF
MV
The demodulated, peak IR Detector output during the
REFERENCE portion of the CFG Wheel cycle.
Measurement /
Reference Ratio
M/R
Ratio
-
The result of CO MEAS divided by CO REF. This ratio is the
primary value used to compute CO concentration. The
value displayed is not linearized.
Sample Pressure
SAMPLE
PRES
In-Hg-A
The absolute pressure of the Sample Gas as measured by a
solid state pressure sensor located inside the Sample
Chamber.
Sample Flow
SAMPLE
FLOW
cc/min
Sample mass flow rate. This is computed from the
differential between the pressures measured up-stream
and down-stream of the Sample Critical Flow Orifice
pressures.
Sample
Temperature
SAMPLE
TEMP
°
C
The Temperature of the gas inside the Sample Chamber.
Bench Temperature
BENCH
TEMP
°
C
Optical Bench Temperature.
Wheel Temperature
WHEEL
TEMP
°
C
Filter wheel temperature.
Box Temperature
BOX
TEMP
°
C
The temperature inside the analyzer chassis.
Photo-detector
Temp. Control
Voltage
PHT
DRIVE
mV
The drive voltage being supplied to the thermoelectric
coolers of the IR Photo-Detector by the Sync/Demod
Board.
Slope
SLOPE
-
The sensitivity of the instrument as calculated during the
last calibration activity.
The Slope parameter is used to set
the span calibration point of the analyzer.
Offset
OFFSET
-
The overall offset of the instrument as calculated during
the last calibration activity. The Offset parameter is used
to set the zero point of the analyzer response.
Test channel output
signal
TEST
mV, mA
Displays the signal level of the TEST Analog Output
Channel. Only Appears when the TEST channel has been
activated.
Current Time
TIME
-
The current time. This is used to create a time stamp on
iDAS readings, and by the AutoCal feature to trigger
calibration events.
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