Problems Tin Tout with LI7200

Environmental Forum Forums LI-COR Environmental General Discussions Problems Tin Tout with LI7200

This topic contains 1 reply, has 2 voices, and was last updated by  IsraelB 2 years, 7 months ago.

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  • #7808

    jmauer
    Participant

    Hello,

    We currently have a problem on one of our LI7200 analyzer.

    Both analyzers are installed at 100m, the first in grassland and the other in cropland.

    The problem is the difference in temperature in and out.

    Grassland:
    Tin(°C): 21.62V
    Tou(°C):20.15V

    Cropland:
    Tin(°C): 32.57
    Tout(°C): 31.34°C

    we thought the reference temperature measurement, but we find nothing about this.

    Can you please guide us on the diagnosis of the problem?

    Thanks for your reply.

    #7831

    IsraelB
    Keymaster

    Generally speaking the two temperature readings will be close to each other. They magnitude of the difference between the two will depend on the incoming air temperature, the flow rate used, and the temperature of the instrument. To check the instrument temperature you can look at the variable ‘block temperature’. The outlet temperature should be closer to the block temperature in general.
    Another thing to check is the head pressure. It is on the same circuit board as the inlet and outlet thermocouple. If there is any issue in the cabling on the board you will see issues in the head pressure reading.
    If pressure readings are correct and the temperature readings are questionable you can replace the thermocouples. Two spare themrocouples are included in the spares kit. If you suspect incorrect readings

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