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Original factory packaging
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Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Updated:2025-03-13
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User's Manual Technic Manual Datasheet
Direct readout of stomatal conductance or stomatal resistance
Simple absolute calibration in the field
Minimises leaf stress during measurement
Ideal for phenotyping based research
Award winning user interface
5 year warranty
Stomatal aperture is the dominant factor in the diffusion conductance of leaf surfaces, which controls both the water loss from plant leaves and the uptake of CO2 for photosynthesis. Measurements of diffusion conductance are therefore important indicators of plant water status and provide a valuable insight into plant growth and plant adaptation to environmental variables.
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.
The AP4 Leaf Porometer has many other features designed to ensure that accurate, reproducible readings can be taken as easily as possible:
Sophisticated temperature compensation
Unstirred leaf chamber minimises unwanted stomatal closure
Lightweight ergonomic sensor head
Large clear LCD display (8 lines by 40 characters)
Full QWERTY keypad for annotating up to 1500 readings
A rugged and reliable tool for phenotyping projects
Over 2,000 Delta-T porometers in use worldwide
| 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% | |||
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