1. Cal gas: Bar 97 HIGH or MID
   1. 4 gas = BAR 97 MID
   2. 5 gas (w NOx) = BAR 97 HIGH
      
      
2. EGA bench: power up and leave exhaust probe in fresh air - let warm up for 20 to 30 minutes.
   
   
3. HOST6600.exe: start this program
   .
4. Port Select: Check box in port that EGA is using.
   
5. Click on STATUS and drag popup window away from HOST6600 window. (to check and monitor EGA function).
   
6. Click START (to start automatic digital gas readings)
   
7. Note gas reading display, refreshing at set intervals.
   
8. Click ZERO. It's the regular "zero" routine - to fresh air
   
   1. CO=0%,
   2. HC=about 0ppm,  (actual atmospheric is still .039% or 1/25th of 1% by volume)
   3. CO2=0%,
   4. O2=about 20.9%,  (actual atmospheric O2 is 20.946%)
   5. NOx= about 0 ppm
      
      
9. Connect "BAR 97" calibration gas to bench inlet at 500ml/min.
   
10. Bench command: #3 SPAN CALIBRATION, SPAN window pops up
    
    
11. Check gases you want to calibrate with "BAR 97" calibration gas and add expected values from label on cal gas bottle or as noted. Just add the value and not the "%" or "ppm".
1. Click CO and enter "8"
2. Click CO2 and enter "12"
   
3. Don't click O2 as O2 is zero in cal gas - calibrate separately to ambient air. (Is my o2 sensor bad?)
   1. When calibrating gases, you cannot enter decimal values, so, if you were calibrating O2, O2 is entered as "21". instead of 20.9. The software might compensate internally.
      
4. Special Note for HC
   1. SOFTWARE ISSUE: In the HOST6600 software, click HC and enter  of 1/2 the cal gas stated, as in if the bottle says 1200, enter 600, Have to do that regardless of cal gas selection (propane or hexane) If you do that, the digital readout, which has been running all this time in the background, will read correctly.
      
5. Only if  you have NO(x), click NO(x) and enter "3000"
   .
   
12. Click SEND, then watch the digital display change (a few seconds later)
    
13. Verify that digital readout matches cal gas values.
    
14. Now, oddly, if you have just installed a new NOx sensor, AFTER YOU CALIBRATE NO(x), go to Bench commands and click on #10 "New NO sensor". Seems more logical to tell the software that it's a new NO sensor before you calibrate, but that's the way the software was written years ago.
    
15.  Note Host6600 digital readings, close Host6600 program, close cal gas, connect EGA pumps and start dyno software and ZERO ega.

http://www.bridgeanalyzers.com/EGA/Automotive/mediaRepos/productDocs/White%20Paper%204.pdf for excellent overview of Bridge and other analyzers, by Robert Schraeder