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  1. #1
    Join Date
    Dec 2007
    Posts
    5

    siemens qam22 temperature and qpa63.1 ppm sensor

    Dear friends,

    On the siemens building management system, we have been using siemens qam22 temperature and qpa63.1 ppm sensors.

    On the building management software insight, there are values like SLOPE and INTERCEPT, i believe that these values can be use during the calibration,

    For calibrating these sensors, have you any experiences?

    thanks..

  2. #2
    Join Date
    Apr 2008
    Location
    UK
    Posts
    151
    Just adjust the intercept up and down to calibrate. The intercept it the point where the slope of the graph intercepts the x axes.

    With the QAM22, the accuracy should be within 0.5 of a degree. If its out by a few degree's think about whether the sensor needs replacing. Ni1000 sensors should have a resistance of 1000 Ohms at 0DegC. Once it starts drifting from that then its likely the slope is actually what has been effected so if you calibrate using the intercept, it will be accurate only at that temperature but will still be wrong at other temperatures.
    -----------------------------------------------------
    Don't be a stupid dwarf. It's not big and it's not clever!

  3. #3
    Join Date
    Apr 2009
    Location
    HR
    Posts
    41
    You should configure that at field level. Do you use PX controllers? If yes then go to xWorks project/your plant/PX design/Edit IO address and find your sensor. Right click on the slope field will show you "conversation parameter". Find your sensor and voila!

    QAM22:
    min max type slope intercept
    -50 80 r1k 0.01 0

    QPA63.1:
    CO2
    min max type slope intercept
    0 2000 u10 0.2 0
    VOC
    min max type slope intercept
    0 2000 u10 -0.2 2000

    Cheers, Z
    Last edited by zlotvor; 04-23-2009 at 05:15 PM.

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