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Teledyne ML - T100 UV Fluorescence SO2 Analyzer
Theory Of Operation
06807A(DCNxxxx)
257
amount. Second, the instantaneous concentration must exceed the average in the long
filter by a portion, or percentage, of the average in the long filter.
If necessary, these filter lengths of these two modes may be
changed to any value
between 1 and 1000 samples. Long sample lengths provide better signal to noise
rejection, but poor response times. Conversely shorter filter lengths result in poor signal
to noise rejection, but quicker response times.
9.7.2. CALIBRATION - SLOPE AND OFFSET
Calibration of the analyzer is performed exclusively in software. During instrument
calibration (refer to Sections 6 and 7) the user enters expected values for zero and span
through the front panel touch-screen control buttons and commands the instrument to
make readings of sample gases with known concentrations of SO
2
. The readings taken
are adjusted, linearized, and compared to the expected values as input. With this
information the software computes values for instrument both slope and offset and stores
these values in memory for use in calculating the SO
2
concentration of the sample gas.
Instrument slope and offset values recorded during the last calibration can be viewed by
pressing the following control buttons sequence
SAMPLE RANGE = 500.000 PPB SO2 =XXX.X
< TST
TST > CAL
SETUP
SAMPLE
TIME = HH:MM:SS
SO2 =XXX.X
< TST
TST > CAL
SETUP
SAMPLE
PMT TEMP=0.0C
SO2 =XXX.X
< TST
TST > CAL
SETUP
SAMPLE
BOX TEMP=0.0C
SO2 =XXX.X
< TST
TST > CAL
SETUP
SAMPLE
RCELL TEMP=0.0C
SO2 =XXX.X
< TST
TST > CAL
SETUP
SAMPLE
HVPS 553 VOLTS
SO2 =XXX.X
< TST
TST > CAL
SETUP
SAMPLE
OFFSET=XX.X MV
SO2 =XXX.X
< TST
TST > CAL
SETUP
SAMPLE
SLOPE=XXX
SO2 =XXX.X
< TST
TST > CAL
SETUP
Figure 9-25:
Calibration Slope and Offset
9.7.3. TEMPERATURE AND PRESSURE COMPENSATION (TPC)
FEATURE
As explained in the theory of operations (refer to Section 9) changes in temperature can
significantly affect the amount of fluoresced UV light generated in the instruments
sample chamber. To negate this effect the T100 maintains the sample gas at a stable,
raised temperature.
Pressure changes can also have a noticeable, if more subtle, effect on the SO
2
concentration calculation. To account for this, the T100 software includes a feature
Содержание T100
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