TN*/ TN Response Check/ Adjustment

 

Purpose:  The TN*/ TN response check/ adjustment is in place to assure that the TN*/ TN 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 “C” or “CTL” model analyzers push Menu and scroll to Calibration Factors then 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 TN*/TN 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 go to the Tools tab and select Trigger Cals.

4.        In the trigger cals menu select TN GRC 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, TN* and TN.

7.        Wait 10 minutes for TN* and TN data to stabilize.  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, TN* and TN data in the appropriate blank for the TRN Zero on the Gas Calibration Worksheet in the As Found section.

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

10.     Wait 10 minutes for TN* and TN data to stabilize then press Get Data.

11.     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.

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 TRN*/TRN information and fax it to Plano.  Hand write TN*/TN on the worksheet to replace TRN*/TRN.  (Note: you can wait until the response checks for all analyzers are complete before faxing to Plano.) 

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 TN analyzer.

2.        Enter the as found data for TN GRC Zero in the as left section for TRN Zero.

3.        On DataView go to the Tools tab and select Trigger Cals.

4.        In the trigger cals menu select TN 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, TN* and TN.

7.        Wait 10 minutes for TN* and TN data to stabilize.  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.

9.        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 DataView is approximately equal to the Actual Expected value from the As Found section worksheet.

10.     When the analyzer adjustments are complete let the analyzer stabilize for 2-5 minutes.

11.     On the Query 1-Minute Data tool push 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 Left section.

13.     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.

14.     When the instrument is finished being tested make sure to put it back into the run mode.

15.     Close the Trigger Cals and Query Data windows.

16.     Save the Gas Calibration worksheet, and then print the TRN*/TRN information and fax it to Plano.  Hand write TN*/TN on the worksheet to replace TRN*/TRN.  (Note: you can wait until the response checks for all analyzers are complete before faxing to Plano.)