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AP4 Porometer
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China
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AP4 Porometer
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Updated:
12/30/2019
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    AP4 Leaf Porometer features

    The AP4 Leaf Porometer measures diffusion conductance by comparing the precise rate of humidification within a small cuvette (chamber) to readings obtained with a calibration plate. The plate has 6 diffusion conductance settings whose values have been accurately determined by finite element analysis.

    Quoted accuracy figures for other porometers and gas analysis systems are based on time-consuming laboratory set-up and calibrations which bear little comparison to field conditions. In contrast, the AP4 Leaf Porometer features simple direct calibration in the field against a tested physical standard.

    Parameter  Reading range  Resolution [1] Accuracy [2] Test conditions [5]
    Reading range
     Conductance  5.0 -1200 mmol m-2 s-1  0.1 – 10  ± 10 %  5 – 800 mmol m-2 s-1
     ± 20 %  800 – 1200 mmol m-2 s-1
     Conductance  0.25 – 30.0 mm s-1  0.01 – 0.1  ± 10%  0.25 – 20 mm s-1
     ± 20 %  20-30 mm s-1
     Resistance  0.2 – 40 s cm-1  0.01 – 0.1  ± 10 %  0.5 – 40 s cm-1
     ± 0.2 s cm-1  0.2 – 0.5 s cm-1
     RH  0 – 100%  0.1  ± 4%  
     Cup temp  -5 – +55 °C  0.1  ± 0.7 °C  0 – 50 °C
     Cup-leaf temp  -5 – +5 °C  0.1  ± 0.2 °C  0 – 50 °C
     PAR flux [3]  0 – 2500 µmol m-2 s-1  10  ± 15%  
     Pressure [4]  600 – 1200 hPa, settable in steps of 5 hPa  
     RH cycle level  20 – 80 %RH, settable in steps of 5%  

    [1] Resolution varies with the magnitude of the value obtained.  The range shown corresponds to the reading range.  In relative terms, the resolution is better than 2%, but at least the smallest amount shown.
    [2] The stated accuracy applies over the range of the calibration plate and for optimum cup conditions, i.e. from +10 to -5 °C difference between actual cup temp. and that existing at calibration, and for +2.5 to -2.5 °C difference between leaf and cup temperatures.
    [3] Spectral and cosine responses are approximate only.
    [4] Ambient pressure may be read from a Wristwatch Barometer type PBR1. 
    [5] Cycling at extreme combinations of temperature, conductance and RH level may not always be possible.

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