NO/NO2 Response
Check/ Adjustment
Purpose: The NO/NO2 response check/ adjustment is to assure that the NO/NO2 analyzer has the correct gas
calibration. This can be accomplished by
introducing a known quantity of gas to the inlet and checking the response on
the instrument. The terminology for this
type of check is GRC (Gas Replacement Calibration). Each GRC has a RF (Response Factor). This RF value should be 1.000.
Required Equipment: Precision flat head screwdriver
Reference: SOPMAN Pages XX-XX
Analyzer Setup
1.
The Background
(BKG) and Coefficient (COEF) on the analyzer should be set to 0.0 and 1.000
respectively.
2.
On the “S” model
analyzers, use the STAT button to check the BKG and COEF. The parameters are as follows: b0. = 0.00, b1. = 0.00, b3. =0.00, S.F.
=1.000 & B.F. =1.000. Push
the STAT button until each of the parameters has been checked. Push
run or auto when finished.
3.
On the “C” or
“CTL” model analyzers push “Menu” and scroll to “Calibration Factors” and press
“Enter”. At this location, the
parameters should be set as follows: Pre
BKG PPB =0.0, NO BKG PPB= 0.0, NOx BKG PPB =0.0, NO COEF =1.000, NOx COEF
=1.000 & NO2 COEF =1.000. Push run when
finished.
Analyzer Response Check
1.
This procedure
will obtain the initial or current RF value for the NO/NO2 analyzer.
2.
Open the Gas
Calibration Worksheet and enter the correct NO concentration (found on the gas
cylinder) in the blank provided.
3.
On DataView
screen go to the Tools tab and select Trigger Cals.
4.
In the Trigger Cals
menu select NO/NO2 Zero and press Start Calibration.
5.
Under the tools
tab select Query 1-Minute Data.
6.
In the query data
tool menu select the Air MFC, Gas MFC, NO and NO2.
7.
Wait 7-10 minutes
or until the data for NO and NO2 are stable.
Press Get Data on the query data tool.
If the query data numbers are approximately equal to the number on
DataView then the data is stable and an average can be taken.
8.
Enter the Air
MFC, NO and NO2 data in the appropriate blank for the NO/NO2 Zero on the Gas
Calibration Worksheet in the As Found section.
9.
Go to Trigger Cals
and push Stop Calibration then select NO/NO2 NO GRC Point 1 and press Start Calibration.
10.
Wait 7-10 minutes
or until the data for NO and NO2 are stable then press Get Data.
11.
Enter the Air
MFC, Gas MFC, NO and NO2 data in the appropriate blanks for the NO/NO2 NO GRC
Point 1 on the Gas Calibration Worksheet in the As Found section.
12.
The RF is now
displayed at the far right of the worksheet.
If the RF is between 0.98 and 1.02, the calibration check is
complete.
13.
Close the Trigger
Cals and Query Data windows.
14.
Save the Gas
calibration worksheet then print the NO/NO2 information and fax it to
15.
If the RF is not
within spec continue with the Analyzer Response Adjustment procedure.
Analyzer Response Adjustment
1.
This procedure
will be used to adjust the analyzer and obtain a corrected RF value for the
NO/NO2 analyzer.
2.
Enter the as
found data for NO/NO2 Zero in the as left section for NO/NO2 Zero.
3.
On DataView go to
the Tools tab and select Trigger Cals.
4.
In the trigger
cals menu select NO/NO2 NO GRC Point 1 and press Start Calibration.
5.
Under the tools
tab select Query 1-Minute Data.
6.
In the query data
tool menu select the Air MFC, Gas MFC, NO and NO2.
7.
Wait 7-10 minutes
or until the data for NO and NO2 are stable.
If the query data numbers are approximately equal to the number on
DataView then the data is stable and an average can be taken.
8.
Adjust the
instrument to the Actual Expected value from the As Found section of the
worksheet.
a.
On “C” or “CTL”
class analyzers the PMT can be adjusted by taking the top off of the
analyzer. With the top of the analyzer
off look on the right side of the bulkhead at the front. There is a blue box with an orange grommet on
the top. Inside the grommet is the PMT
adjustment screw. Some CTL model
analyzers have been modified so that the PMT can be adjusted through the front
panel. Adjust the analyzer until the NO
channel on the analyzer or NO on DataView is approximately equal to the Actual
Expected value from the As Found section worksheet.
b.
On “S” class
analyzers open the front door on the analyzer and adjust the PMT screw until
channel one on the analyzer or NO on DataView is approximately equal to the
Actual Expected value from the As Found section worksheet.
9.
When the analyzer
adjustments are complete, let the analyzer stabilize for 2-5 minutes.
10.
On the Query
1-Minute Data tool push Get Data.
11.
Enter the Air
MFC, Gas MFC, NO and NO2 data in the appropriate blank for the NO/NO2 NO GRC
Point 1 on the Gas Calibration Worksheet in the As Left section.
12.
The RF is now
displayed at the far right of the worksheet.
If the RF is between 0.98 and 1.02, the calibration adjustment is
complete. If the RF is not within spec,
repeat the adjustment part of the procedure again.
13.
When the
instrument is finished being tested make sure to put it back into the run mode.
14.
Close the Trigger
Cals and Query Data windows.
15.
Save the Gas
Calibration worksheet, and then print the NO/NO2 information and fax it to