Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 197)

Calibration Procedures Model 9110TH NOx Analyzer
Teledyne Analytical Instruments 177
5.4. CALIBRATION CHECKS
Informal calibration checks, which only evaluate but do not alter the analyzer’s response
curve, are recommended as a regular maintenance item and in order to monitor the
analyzer’s performance. To carry out a calibration check rather than a full calibration,
follow these steps.
STEP ONE:
Connect the sources of zero air and span gas as shown in Figure 7.2 or 7.3.
STEP TWO:
Perform the zero/span calibration check procedure:
SAMPLE NOX STB= XXX.X PPM NOX=XXX.X
< TST TST > CAL SETUP
The ZERO and/or SPAN
keys will appear at various
points of this process.
It is not necessary to press
them.
SAMPLE A1:NXCNC1=100PPM NOX=XXX.X
< TST TST > CAL SETUP
Set the Display to show
the NOX STB test
function.
This function calculates
the stability of the NO/NO
x
measurement
Toggle TST> button until ...
Allow zero gas to enter the sample port
at the rear of the analyzer.
Wait until NOX STB
falls below 0.5 ppm.
This may take several
minutes.
Allow span gas to enter the sample port
at the rear of the analyzer.
Wait until NOX STB
falls below 0.5 ppm.
This may take several
minutes.
Analyzer display
continues to cycle
through all of the
available gas
measurements
throughout this
procedure.
Record NO
X
, NO, NO
2
or O
2
zero point
readings
Record NO
X
, NO, NO
2
or O
2
span point
readings