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Model GFC7000E Instruction Manual Operating Instructions
04584 Rev A1 47
Title
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 6.7 for more information.
Stability STABIL
PPB, PPM
UGM,
MGM
Standard deviation of CO
2
concentration readings. Data
points are recorded every ten second. The calculation uses
the last 25 data points.
CO
2
Measure
CO
2
MEAS
MV
The demodulated, peak IR detector output during the
measure portion of the CFG Wheel cycle.
CO
2
Reference CO
2
REF MV
The demodulated, peak IR detector output during the
reference portion of the CFG wheel cycle.
Measurement /
Reference
Ratio
MR Ratio -
The result of CO2 MEAS divided by CO2 REF. This ratio is
the primary value used to compute CO
2
concentration. The
value displayed is not linearized.
Sample
Pressure
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
FL
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
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
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.
1
Only appears when the instrument’s reporting range mode is set for DUAL or AUTO