Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 201)

Calibration Procedures Model 9110TH NOx Analyzer
Teledyne Analytical Instruments 181
5.6. CALIBRATION CHECKS WITH ZERO/SPAN VALVES
Zero and span checks using the zero/span valve option are similar to that described in
Section 7.4, except that zero air and span gas are supplied to the analyzer through the
zero gas and span gas inlets from two different sources.
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.
To perform a manual calibration check with zero/span valve:
STEP ONE:
Connect the sources of Zero Air and Span Gas as shown in section 7-4.
STEP TWO:
Perform the zero/span check.
The ZERO and/or SPAN
keys will appear at various
points of this process.
It is not necessary to press
them.
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.
Record NO
X
, NO, NO
2
or O
2
zero point
readings
Record NO
X
, NO, NO
2
or O
2
span point
readings
SAMPLE A1:NXCNC1=100PPM NOX=XXX.X
< TST TST > CAL CALZ CALS SETUP
SAMPLE A1:NXCNC1=100PPM NOX=XXX.X
< TS T TST > CAL CALZ CALS SETUP
SAMPLE A1:NXCNC1=100PPM NOX=XXX.X
< TS T TST > CAL CALZ CALS SETUP
SAMPLE GAS TO CAL:NOX
NOX O2 ENTR EXIT
SAMPLE RANGE TO CAL:LOW
LOW HIGH ENTR EXIT
Analyzers enters
ZERO cal
mode.
SAMPLE A1:NXCNC1=100PPM NOX=XXX.X
< TS T TST > CAL CALZ CALS SETUP
SAMPLE GAS TO CAL:NOX
NOX O2 ENTR EXIT
SAMPLE RANGE TO CAL:LOW
LOW HIGH ENTR EXIT
Analyzers enters
SPAN cal
mode.
SPAN CAL M NOX STB= XXX.X PPM NOX=X.XXX
<TST TST> ZERO SPAN CONC EXIT
SAMPLE A1:NXCNC1=100PPM NOX=XXX.X
< TS T TST > CAL CALZ CALS SETUP
ZERO CAL M NOX STB= XXX.X PPM NOX=XXX.X
<TST TST> ZERO CONC EXIT
ZERO CAL M NOX STB= XXX.X PPM NOX=XXX.X
<TST TST> ZERO CONC EXIT
Return to
SAMPLE
Display
SPAN CAL M NOX STB= XXX.X PPM NOX=XXX.X
<TST TST> ZERO CONC EXIT
Return to
SAMPLE
Display