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Basic Operation Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 87
Table 6-2: Test Functions Defined
PARAMETER DISPLAY TITLE UNITS MEANING
Stability
STABIL
PPB
3
, PPM
UGM
3
, MGM
Standard deviation of CO concentration readings. Data points are
recorded every ten seconds using the last 25 data points. This
function can be reset to show O
2
or CO
2
stability in instruments with
those sensor options installed.
Range
RANGE
RANGE1
1
RANGE2
1
PPB, PPM,
UGM, MGM
The full scale limit at which the reporting range of the analyzer is
currently set. THIS IS NOT the Physical Range of the instrument.
See Section 6.6.1 for more information.
O
2
Range
1
O
2
RANGE
% The range setting for the optional O
2
Sensor.
CO
2
Range
2
CO
2
RANGE
% The range setting for the optional CO
2
Sensor.
CO Measure
CO MEAS
MV
The demodulated, peak IR detector output during the measure
portion of the GFC Wheel cycle.
CO Reference
CO REF
MV
The demodulated, peak IR detector output during the reference
portion of the GFC Wheel cycle.
Measurement /
Reference Ratio
MR 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
PRES
In-Hg-A
The absolute pressure of the Sample gas as measured by a
pressure sensor located inside the sample chamber.
Sample Flow
SAMPLE FL
cm
3
/min
Sample mass flow rate as measured by the flow rate sensor in the
sample gas stream.
Sample
Temperature
SAMP TEMP
C
The temperature of the gas inside the sample chamber.
Bench
Temperature
BENCH TEMP
C
Optical bench temperature.
Wheel
Temperature
WHEEL TEMP
C
GFC Wheel temperature.
Box Temperature
BOX TEMP
C
The temperature inside the analyzer chassis.
O
2
Cell
Temperature
3
O
2
CELL TEMP
3
C
The current temperature of the O
2
sensor measurement cell.
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.
Offset
OFFSET
-
The overall offset of the instrument as calculated during the last
calibration activity.
O
2
Sensor
Slope
1
O
2
SLOPE
- O
2
slope, computed during zero/span calibration.
O
2
Sensor Offset
1
O
2
OFFSET
- O
2
offset, computed during zero/span calibration.
CO
2
Sensor
Slope
2
CO
2
SLOPE
- CO
2
slope, computed during zero/span calibration.
CO
2
Sensor
Offset
2
CO
2
OFFSET
- CO
2
offset, computed during zero/span calibration.
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.
1
Only appears when the optional O
2
sensor is installed.
2
Only appears when the optional CO
2
sensor is installed.
3
Only available on the GFC 7001E.