CO/SO2 Zero Baseline
and Response Check/Adjustment
Purpose: The CO/SO2 zero baseline and response
check/adjustment assures that the CO and SO2 analyzers have 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
CO Analyzer Zero Baseline Check/Adjustment
1.
Open the Gas
Calibration worksheet.
2.
On DataView go to
the tools tab and select Trigger Cals.
3.
In the trigger cals menu select CO Zero and press Start Calibration.
4.
Under the tools
tab select Query 1-Minute Data. In the
query data tool menu select CO.
5.
Enter the
Background (BKG) number into a new QA Result in TrackOps. The Operations Class is CO and the QA Check
Type is BKG VALUE.
6.
To find the BKG
number on a 48CTL analyzer scroll down to Calibration Factors and press
enter. Then scroll to CO BKG PPM and
press enter. The top number is the PPM
(Parts Per Million) number for the analyzer and the
bottom number is the BKG number.
(Note: The analyzer reads in PPM
and the DAS reads in PPB. If the
analyzer is 0.500 PPM the DAS should read 500 PPB.)
7.
Wait 7-10 minutes
or until the CO number is stable. Press
Get Data on the query data tool. If the
query data numbers are larger or approximately equal to the number on DataView
then the data is stable and an average can be taken.
8.
Enter the CO
value into a new QA Result in TrackOps.
The Operations Class is CO and the QA Check Type is CO ZERO.
9.
The 48CTL
analyzer should already be in the adjustment screen (follow step 6). Use the up and down arrows to adjust the
Background number so that the DAS CO number is ~200 PPB or the analyzer is
~0.200 PPM. When this is complete press
enter on the analyzer.
10.
Enter the new Background
(BKG) number into a new QA Result in TrackOps.
The Operations Class is CO and the QA Check Type is BKG VALUE.
11.
Enter the new CO
value into a new QA Result in TrackOps.
The Operations Class is CO and the QA Check Type is CO ZERO.
12.
If the BKG gives
a warning that it has reached the limit and can not be adjusted, please see the
section below, CO ANALYZER INITIAL S/R RATIO ADJUSTMENT, for a procedure to
bring the BKG back into adjustable limits.
13.
Press Run or Auto
on the analyzer and close the Trigger Cals Menu.
SO2 Analyzer Zero Baseline Check/Adjustment
1.
Open the Gas
Calibration worksheet.
2.
On DataView go to
the tools tab and select Trigger Cals.
3.
In the trigger cals menu select CO/SO2 Zero and press Start Calibration.
4.
Under the tools
tab select Query 1-Minute Data. In the
query data tool menu select SO2.
5.
Enter the
Background (BKG) number into a new QA Result in TrackOps. The Operations Class is SO2 and the QA Check
Type is BKG VALUE.
a.
To find the BKG
number on a 43CTL analyzer scroll down to Calibration Factors and press
enter. Then scroll to SO2 BKG PPB and
press enter. The top number is the PPB
(Parts Per Billion) number for the analyzer and the
bottom number is the BKG number.
b. On a 43S analyzer the Zero Pot is on the front of the
instrument. Read the number in the
window then the number on the hash marks and then count the number of hash
marks from the main number to the pointer.
(Ex.: window = 2, main hash mark
number = 7, the number of hash marks from the main number to the pointer = 4 –
From this information the Zero Pot number is 2.74.)
6.
Wait 7-10 minutes
or until the SO2 number is stable. Press
Get Data on the query data tool. If the
query data numbers are larger or approximately equal to the number on DataView
then the data is stable and an average can be taken.
7.
Enter the SO2 zero
value into a new QA Result in TrackOps.
The Operations Class is SO2 and the QA Check Type is SO2 ZERO. If the QA Result indicated the check fails
adjust the SO2 BKG value.
a.
If you have a
43CTL analyzer it should already be in the adjustment screen (follow step
6). Use the up and down arrows to adjust
the Background number so that the SO2 PPB number is ~1.00. When this is complete press enter on the
analyzer.
b. On a 43 S analyzer adjust the Zero Pot until the SO2
PPB reading is approximately 1.00.
8.
Enter the new Background
(BKG) number into a new QA Result in TrackOps.
The Operations Class is SO2 and the QA Check Type is BKG VALUE.
9.
Enter the new SO2
zero value into a new QA Result in TrackOps.
The Operations Class is SO2 and the QA Check Type is SO2 ZERO.
10. On the query data tool press Get Data and enter the
SO2 number in the as left cell of the Gas Calibration worksheet.
11. Press Run or Auto on the analyzer and close the
Trigger Cals Menu.
CO/SO2 Analyzer Response Check
1.
This procedure
will obtain the initial or current RF value for the CO and SO2 analyzers.
2.
Open the Gas
Calibration Worksheet and enter the correct CO and SO2 concentrations (found on
the gas cylinder) in the blank provided.
3.
On DataView go to
the tools tab and select Trigger Cals.
4.
In the Trigger
Cals menu, select CO/SO2 Zero and press Start Calibration.
5.
Under the tools
tab select Query 1-Minute Data. In the
query data tool menu select Air MFC, Gas MFC, CO and SO2.
6.
Wait 20 minutes
or until the data for CO isn’t changing by more than 3 PPB per minute and the
SO2 isn’t changing by more than 0.05 PPB per minute. This is so that the instruments can equalize
before going on to the next step.
7.
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 CO
result in a new QA Result in TrackOps. The
Operations Class is CO and the QA Check Type is CO/SO2 ZERO.
9.
Enter the SO2
result in a new QA Result in TrackOps. The
Operations Class is SO2 and the QA Check Type is CO/SO2 ZERO.
10.
Go to Trigger
Cals and push Stop Calibration then select CO/SO2 GRC Point 1 and press Start
Calibration.
11.
Wait 7-10 minutes
or until the data for CO and SO2 are stable.
Press Get Data on the query data tool.
12.
Enter the CO data
into a new QA Result in TrackOps. The
Operations Class is CO and the QA Check Type is CO/SO2 GRC PT1.
13.
Enter the AIR MFC,
GAS MFC, the previous CO value from the CO/SO2 Zero
14.
Enter the Air
MFC, Gas MFC, CO and SO2 data in the as found section of the Gas Calibration
worksheet. Also enter the COEF and/or
Span Pot number.
a.
To find the COEF
(Coefficient) on a 48CTL CO analyzer scroll down to Calibration Factors and
press enter. Then scroll to CO COEF and
press enter. The top number is the PPM
(Parts Per Million) number for the analyzer and the
bottom number is the COEF number.
b.
To find the COEF
(Coefficient) number on a 43CTL analyzer scroll down to Calibration Factors and
press enter. Then scroll to SO2 COEF and
press enter. The top number is the PPB
(Parts Per Billion) number for the analyzer and the
bottom number is the COEF number.
c.
On a 43S analyzer
the Span Pot is on the front of the instrument.
Read the number in the window then the number on the hash marks and then
count the number of hash marks from the main number to the pointer. (Ex.:
window = 2, main hash mark number = 7, the number of hash marks from the
main number to the pointer = 4 – From this information the Zero Pot number is
2.74.)
15.
Go to Trigger
Cals and press Stop Calibration then select CO/SO2 Zero and press Start
Calibration.
16.
Wait 7-10 minutes
or until the data for CO and SO2 are stable.
Press Get Data on the query data tool.
17.
Enter the Air
MFC, CO and SO2 data in the as found section of the Gas Calibration worksheet.
18.
The Actual
Expected value is calculated by adding the final Zero Value and Calculated
Expected Value.
19.
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.
20.
Close the trigger
cals window and query data window.
21.
Save the Gas
calibration worksheet, and then print the CO and SO2 Response information and
fax to
22.
If either RF is
not within the specified range continue with the Analyzer Response Adjustment.
CO/SO2 Analyzer Response Adjustment
1.
This procedure
will be used to adjust the analyzers and obtain a corrected RF value for the CO
and SO2 analyzers.
2.
Using the as
found data for the CO/SO2 Zero, enter the Air MFC, CO and SO2 values in the as
left section.
3.
On DataView go to
the tools tab and select Trigger Cals.
4.
In the Trigger
Cals menu, select CO/SO2 GRC Point 1 and press Start Calibration.
5.
Under the tools
tab select Query 1-Minute Data. In the
query data tool menu select Air MFC, Gas MFC, CO and SO2.
6.
Wait 7-10 minutes
or until the data for CO and SO2 are stable.
7.
Adjust the
instruments.
a.
On 48CTL CO
analyzers push menu. Scroll down to CAL
FACTORS and push ENTER. Go to the CO
COEF and press enter. The top number is
the PPM (Parts Per Million) number for the analyzer
and the bottom number is the COEF number.
Use the up and down arrows to adjust the COEF number so that the DAS CO
PPB number approximately equal to the Actual Expected value from the as found
section. When this is complete press
enter on the analyzer.
b.
On 43CTL
analyzers push menu. Scroll down to CAL
FACTORS and push ENTER. Go to the SO2
COEF and press enter – Set the SO2 COEF to 1.0.
The PMT can be adjusted by taking the top off of the analyzer. With the top of the analyzer off, look on
the left 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. Slowly adjust the analyzer until
the SO2 ppb on the analyzer, or SO2 on DataView, is approximately equal to the
Actual Expected value from the as found section. The PMT adjustment screw on the inside of the
analyzer is a coarse adjustment and the SO2 COEF is a fine adjustment. The SO2 COEF should always be close to a
standard of 1.00 but it can be used to adjust the instrument to a tighter
tolerance. The SO2 COEF will adjust the
instrument in smaller increments than the PMT adjustment. Replace the top of the analyzer.
c.
On 43S analyzers
set the Span Pot to 5.00. Open the front
door on the analyzer and slowly adjust the PHOTOMULTIPLIER GAIN screw until the
SO2 reading on the analyzer, or SO2 on DataView, is approximately equal to the
Actual Expected value from the as found section. The PMT adjustment screw on the inside of the
analyzer is a coarse adjustment and the Span Pot is a fine adjustment. The Span Pot should always be close to a
standard of 5.00 but it can be used to adjust the instrument to a tighter
tolerance. The Span Pot will adjust the
instrument in smaller increments than the PMT adjustment.
8.
When the analyzer
adjustments are complete, let the analyzers stabilize for 7-10 minutes. Press Get Data on the query data tool.
9.
Enter the Air MFC,
Gas MFC, CO and SO2 data in the as found section of the Gas Calibration
worksheet. Also enter the COEF and/or
Span Pot number.
10.
The Actual
Expected value is calculated by adding the final Zero Value and Calculated
Expected Value.
11.
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.
23.
Go to Trigger
Cals and press Stop Calibration then select CO/SO2 Zero and press Start
Calibration.
24.
Wait 7-10 minutes
or until the data for CO and SO2 are stable.
Press Get Data on the query data tool.
25.
Enter the Air
MFC, CO and SO2 data in the as left section of the Gas Calibration worksheet.
26.
Close the trigger
cals window and query data window.
27.
Save the Gas
calibration worksheet, and then print the CO and SO2 Response information and
fax to
CO ANALYZER INITIAL S/R RATIO ADJUSTMENT
1.
From the Main
Menu, scroll down to INSTRUMENT CONTROL and hit enter.
2.
Scroll down to
SERVICE MOCE, and hit the enter key. Hit enter once again and wait for the
parameters to be saved.
3.
Hit the menu key
twice and scroll down to SERVICE and hit enter.
4.
In the SERVICE
menu, scroll down to INITIAL S/R RATIO and hit enter.
5.
Here you will see
values for CURRENT and INIT ZERO with the ability to edit. Use the up or down
arrow to make the INIT ZERO value as close as possible to the CURRENT and hit
enter to save the parameters.
6.
When you have
completed these steps, you will have to go back to the Main Menu and scroll to
INSTRUMENT CONTROL and hit enter.
7.
Scroll down to
Service and hit enter. Hit enter once again and wait for the parameters to be
saved.
8.
Finally, you will
have to go back and reset the BKG using the steps already outlined.