Data Integrity Check Instructions

 

Purpose:  The Data Integrity check is in place so assurance is made that the DAS is reporting what the analyzer is reading.  This can be accomplished by making the analyzer of choice output a zero and fullscale voltage.  With this information and the set range of the instrument it is possible to calculate the percent difference of the DAS to the analyzer.

 

Required Equipment:  None

 

Reference:  SOPMAN Pages XX-XX

 

 

Thermo Analyzer Checks

 

1.        This check includes the following analyzers:  O3, O3PS, CO, SO2, NO/NO2, NOy*/NOy, NO3/NH4, SO4 and TRN.

2.        Open the Data Integrity Check form and complete the output range for each instrument thermo analyzer.

3.        This can be done for all “C” model analyzers by pressing Menu and then enter into the range.  The output range should be displayed on this screen (Note:  On the NO/NO2, NOy*/NOy and TRN analyzers the range is taken from the NO and NOx channels).  For a 42S the range can be obtained by pushing the stat button (Note:  The range needed will be the same as the C model in that the NO and NOx are the channels to be obtained.  They will look as follows:   1    100, 3    100.  The number 1 and 3 are the channels and 100 is the range).  On all O3 analyzers both S and C the analyzer range is 0 to 500.

4.        To have an analyzer output zero on a 42S push the Z/FS button once, it will then display the number 0 and for the fullscale voltage push the Z/FS button again, it will then display FSCALE.  On all C class analyzers push Menu, scroll to Diagnostics and press enter, scroll to Test Analog Output and press enter, scroll to Zero and press enter.  This is the zero.  To output Fullscale on the C class, while it is outputting zero, push menu then scroll to fullscale or 100% and press enter.  The analyzer is now displaying 100%.  This is the fullscale voltage.

5.        Take 2 1-minute averages for the zero and fullscale from the DAS.  Use the Query Data tool.

6.        The only other analyzer that is different is the 43S or old SO2 analyzer.  To obtain a zero value open the front and turn the PMT and Flasher to the off position.  Let it stabilize and compare the readings on the analyzer with what Dataview is reading.  To obtain the fullscale value from the current status, turn the RUN/TEST switch inside the front door to TEST.  Let it stabilize and compare the readings on the analyzer with what Dataview is reading.  Make sure when you finish turn the RUN/TEST back to RUN and turn the PMT and Flasher back on.

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

 

 

R & P Analyzers

 

1.        This check includes the following analyzers:  TEOM and 5400

2.        Neither the TEOM nor 5400 have to be taken out of the run mode for this check.

3.        On the TEOM the range is found by pushing the A/O button on the front panel.  From here take down all of the minimum and maximum values as the range on the Data Integrity check worksheet.  On the 5400 the range is found from the main screen by pushing F5 “Setup”, then F1 “Output” and finally F1 “A/O”.  From here take down all of the minimum and maximum values as the range on the Data Integrity check worksheet.  

4.        On both the TEOM and 5400 the zero and fullscale are obtained the same way.  To have the instrument output a zero go to the A/O screen and set all minimum values the maximum value minus 1 (Ex.  Max =200.  The min value will be 199 while the max is 200).  To actuate the fullscale output, set all of the minimum values to -2 and all of the maximum values to -1  (Note:   On the 5400 you will have to use the F1 “ –List” and F2 “+List” to achieve a negative number).

5.        Take 2 1-minute averages for the zero and fullscale from the DAS.  Use the Query Data tool.

6.        Set all of the values back to the original settings recorded earlier in this procedure.

 

 

 

Aethalometer

 

  1. The Aethalometer has to be in the stop mode to do this test.
  2. To do this push the stop button twice then type the security code (111) and press enter.  The instrument will now read “Operate” on the front panel.
  3. This instrument has range of 0 to 10.  To check this, scroll through the different screens until the screen reads “Change Settings”, then press enter.
  4. Once in this menu section, scroll to “Analog Output Port” and press enter then scroll to “Signal Output” and press enter.  The Aethalometer should now be in the Output Scale Factor screen.  The display will show old and new.  New will be blank but old should read as 2ug/m3/V.  This makes the range 0 to 10 ug/m3 because the fullscale voltage output is 5 volts DC.
  5. From this point scroll to “Return to Main Menu” and press enter then press enter to answer “Yes” to write settings.
  6. To make the instrument output 0 and fullscale (5VDC) scroll to “Self Test” and press enter.  From here follow the direction until you get to the Analog output test.  Once the Aethalometer is in the output test the reading will be V=0.  This is the A/O zero for the instrument.  From here use the up arrow very slowly and raise the number so that it reads:  V= +5VDC.  This is the A/O fullscale.
  7. During the zero and fullscale take an average from the DAS.
  8. When you are finished with the fullscale point press enter, then esc to finish the self test.
  9. With the system back at the main menu the screen should read “Operate”.  Press enter and make the Aethalometer go back into Automatic Operation (Run Mode).

 

 

Nephalometer

 

  1. The Nephalometer does not have a stop mode but the channel needs to be downed on the DAS to do this test.
  2. The Nephalometer is unusual in that it doesn’t have a way to manually initiate a zero or fullscale.
  3. Range is not a real component of the Nephalometer.  The zero and fullscale is actually a filter zero and an ambient reading.
  4. Before anything is done the ambient readings (fullscale) will be taken.
  5. Let it stabilize and compare the readings on the analyzer with what Dataview is reading.
  6. To obtain a zero from the Nephalometer start an SO2 Zero (Aeth/Neph Zero on Dataview version 2.5).
  7. Let it stabilize and compare the readings on the analyzer with what Dataview is reading.
  8. Now that both points are obtained stop the calibration and up the Neph channel.

 

 

Temperature Controllers

 

All temperature controllers are checked in the same manner.  To check a temperature controller an instantaneous reading will be taken.  Let it stabilize and compare the readings on the controller with what Dataview is reading.

 

 

Specs

 

Using the specs on the Data Integrity Check Worksheet, check the “Diff” (difference) numbers obtained after all data has been entered into the form.  If the “Diff” numbers are within spec then the integrity check is finished.  If they are not within spec then the instrument will need to be calibrated to the DAS.  When a calibration is done make sure the final calibrated numbers are written into the bottom of the Data Integrity Check Worksheet.

 

 

Calibrating

 

Follow the following step to calibrate an instrument to the DAS.

 

When calibrating the instrument use a two-point calibration.  A two point calibration is done by obtaining the DAP value for zero and obtaining the DAP value for full scale.  To make a DAS channel show the DAP value, open Cal Channel and select the name of the channel that needs to be calibrated, then push the “Set to Dap Int” button.  With the DAP values and the range it is now possible to calibrate the DAS channel for a specific instrument.  The calibration should look like the following diagram.

 

            The Cal Channel should then look like this:

                       

 

Analyzer Range Settings  

 

All range settings should follow the following set up.  If there is a discrepancy it will be site and analyzer specific.  The following tables are the range settings.