TN*/ TN Audit and Calibration

 

Purpose:  The TN*/ TN response audit and calibration is in place to assure that the TN*/ TN analyzer/system has the correct gas response.  This can be accomplished by introducing a known quantity of gas to the inlet and auditing the response on the instrument.  The terminology for this type of audit is GRC (Gas Replacement Calibration).  Each GRC has a RF (Response Factor).  This RF value should be 1.000 +/- 2%. 

 

Required Equipment:  Precision flat head screwdriver

 

Analyzer Setup

1.    The Background (BKG) and Coefficient (COEF) on the analyzer should be set to 0.0 and 1.000.

2.        On the “C” or “CTL” model analyzers press Menu and scroll to Calibration Factors then press Enter.  At this point 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.  Press Run when finished.

 

Analyzer Audit

1.    This procedure will obtain the current RF value for the TN*/TN analyzer.

3.        Open the Gas Calibration Worksheet and enter the correct NO concentration (found on the gas cylinder) in the blank provided.

4.        On Site Manager go to the Tools tab and select Trigger Cals.

5.        In the Trigger Cals menu select TN GRC Zero and press Start Calibration.

6.        Under the Tools tab select Query 1-Minute Data.

7.        In the Query Data Tool menu select the Air MFC, Gas MFC, TN* and TN.

8.        Wait 13 minutes and verify the Zeros for TN* and TN are stable (+/-0.1 ppb).  Contact Plano if not stable within 15 minutes.  Press Get Data on the Query Data Tool.

9.        Enter the Air MFC, TN* and TN data in the appropriate blank for the TRN Zero on the Gas Calibration Worksheet in the As Found section.

10.     Go to Trigger Cals and press Stop Calibration then select TN NO GRC Point 1 and press Start Calibration.

11.     Wait 13 minutes and verify the data for TN* and TN are stable (+/- 0.2ppb), then press Get Data.

12.     Enter the Air MFC, Gas MFC, TN* and TN data in the appropriate blank for the TRN NO GRC Point 1 on the Gas Calibration Worksheet in the As Found section.

13.     The RF is now displayed in the worksheet.  If the RF is between 0.98 and 1.02 the audit is complete. 

14.     Close the Trigger Cals and Query Data windows. 

15.     Save the Gas calibration worksheet.

16.     If the RF is not within specification continue with the Analyzer Calibration procedure.

 

Analyzer Calibration

1.    This procedure will be used to adjust the analyzer and obtain a corrected RF value for the TN analyzer.

2.        Enter the As Found data for TN GRC Zero in the As Left section for TRN Zero.

3.        In Site Manager go to the Tools tab and select Trigger Cals.

4.        In the Trigger Cals menu select TN*/TN Zero and wait 5 minutes for data to be captured for First Light use

5.        In the Trigger Cals menu select TN NO GRC Point 1 and press Start Calibration.

6.        Under the Tools tab select Query 1-Minute Data.

7.        In the Query Data Tool menu select the Air MFC, Gas MFC, TN* and TN.

8.        Wait 13 minutes and verify the data for TN and TN* are stable (+/- 0.2 ppb).  If the query data numbers are approximately equal to the number on Site Manager, then the data is stable and an average can be taken.

9.        Adjust the instrument to the Actual Expected value from the As Found section of the worksheet.

10.     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 TN* on Site Manager is approximately equal to the Actual Expected value from the As Found section worksheet.

11.     When the analyzer calibration is complete let the analyzer stabilize for 5 minutes.

12.     On the Query 1-Minute Data tool press Get Data.

13.     Enter the Air MFC, Gas MFC, TN* and TN data in the appropriate blank for the TRN NO GRC Point 1 on the Gas Calibration Worksheet in the As Left section.

14.     The RF is now displayed in the worksheet.  If the RF is between 0.98 and 1.02 the calibration is complete.  If the RF is not within specification repeat the calibration part of the procedure again.

15.     When the instrument is finished being calibrated make sure to put it back into the Run mode.

16.     Close the Trigger Cals and Query Data windows.

17.     Save the Gas Calibration worksheet.

 

TN*/TN NO2 Conversion Efficiency Audit

1.        This procedure will obtain the current RF value for the NO2 Conversion Efficiency.

2.        Open the Gas Calibration Worksheet and go to the NO2 Conv Eff Worksheet tab.  Enter the correct NO and NO2 concentrations (found on the gas cylinder) in the blanks provided.

3.        An NO audit of the analyzer has to be completed before the NO2 conversion efficiency can be completed.  You may use that day’s information if available.  If it is available enter the information and start with Step 15.  Otherwise continue with the next Step.

4.        On the Site Manager screen go to the Tools tab and select Trigger Cals.

5.        In the Trigger Cals menu select TN Zero and press Start Calibration.

6.        Under the Tools tab select Query 1-Minute Data.

7.        In the query data tool menu select the Air MFC, Gas MFC, TN* and TN.

8.        Wait 13 minutes and verify the Zeros for TN* and TN are stable (+/-0.1 ppb).  Contact Plano if not stable within 15 minutes.  Press Get Data on the Query Data Tool.

9.        Enter the Air MFC, TN* and TN data in the appropriate blank for the TN Zero on the NO2 Conv Eff Worksheet in the TN*/TN Analyzer Response section.

10.     Go to Trigger Cals and press Stop Calibration then select TN*/TN NO GRC Point 1 and press Start Calibration.

11.     Wait 13 minutes and verify the data for TN* and TN are stable (+/- 0.2ppb), then press Get Data.

12.     Enter the Air MFC, Gas MFC, TN* and TN data in the appropriate blanks for the TN*/TN NO GRC Point 1 on the NO2 Conv Eff Worksheet in the TN*/TN Analyzer Response section.

13.     The RF is now displayed at the far right of the worksheet. 

14.     Save the Gas Calibration Worksheet.

15.     In the Trigger Cals menu select TN Zero and press Start Calibration.

16.     Under the Tools tab select Query 1-Minute Data.

17.     In the query data tool menu select the Air MFC, Gas MFC, TN* and TN.

18.     Wait 13 minutes and verify the Zeros for TN* and TN are stable (+/-0.1 ppb).  Contact Plano if not stable within 15 minutes.  Press Get Data on the Query Data Tool.

19.     Enter the Air MFC, TN* and TN data in the appropriate blank for the TN Zero on the NO2 Conv Eff Worksheet in the TN*/ TN NO2 Conversion Efficiency section.

20.     Go to Trigger Cals and press Stop Calibration then select TN*/TN NO2 GRC Point 1 and press Start Calibration.

21.     Wait 13 minutes and verify the data for TN* and TN are stable (+/- 0.2ppb), then press Get Data.

22.     Enter the Air MFC, Gas MFC, TN* and TN data in the appropriate blanks for the TN*/TN NO2 GRC Point 1 on the NO2 Conv Eff Worksheet in the TN*/TN NO2 Conversion Efficiency section.

23.     The RF is now displayed at the far right of the worksheet.

24.     If the RF is less than 0.95 it is out of spec and the RF will turn red.

25.     Contact Plano if the RF is out of spec.

26.     Close the Trigger Cals and Query Data windows.

27.     Save the Gas Calibration Worksheet.