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Teledyne API – T101 Operation Manual EPA Protocol Calibration
195
7.5. DYNAMIC MULTIPOINT SPAN CALIBRATION
Dynamic calibration involves introducing gas samples of known concentrations to an
instrument in order to record the instrument’s performance at a predetermined sensitivity
and to derive a calibration relationship. A minimum of three reference points and one zero
point uniformly spaced covering 0 to 90 percent of the operating range are recommended
to define this relationship.
The analyzer's recorded response is compared with the known concentration to derive the
calibration relationship.
To perform a precision check, the instrument set up, sources of zero air and sample gas
should conform to those described in Section 6.2.
Follow the procedures described in section 6.2 for calibrating the zero points.
For each mid point:
SPAN CAL M RANGE = 500.0 PPB SO
2
X.XXX
< TST TST > ZERO SPAN CONC EXIT
Wait until
SO2 STB falls
below 0.5 ppb.
This may take
several minutes.
SAMPLE SO2 STB=X.XXX PPB SO2 =X.XXX
< TST TST > CAL CALZ CALS SETUP
Record the SO
2
reading as
displayed on the
instrument’s front
panel
Press EXIT to
Return to the
Main SAMPLE
Display
ACTI O N:
Allow Calibration Gas diluted to
proper concentration for
Midpoint N+1 to enter the sample
port
A
CTION:
Allow calibration gas diluted to proper concentration for
Midpoint N to enter the sample port
SAMPLE* RANGE = 500.000 PPB SO2 =X.XXX
< TST TST > CAL SETUP
SAMPLE SO2 STB =X.XXX PPB SO2 =X.XXX
< TST TST > CAL SETUP
Set the Display to show the
SO2 STB test function.
This function calculates the
stability of the SO
2
measurement
07266B DCN6485