The PMR-5 is designed to be used with our popular EGM-4 CO₂ analyzer. The EGM-4 supplies the power (internal, rechargeable 12V battery), measures the outputs from the porometer sensors, processes the results and then displays and records the data. The PMR-5 is a hand-held unit using and "open system" measurement of leaf transpiration. There is an integral mass-flow controlled air supply and manual control of humidity up to ambient. The lightweight cuvette is designed to couple the leaf to the ambient temperature using a fan, heat sink and radiation shield. There is a stirring fan in the chamber to minimise the boundary layer resistance. Digital humidity and temperature sensors accurately monitor the air entering and leaving the cuvette. These are closely situated in the chamber with tortuous air paths to minimise the temperature difference between sensors.

There is continuous calculation and display of the reference and chamber humidity, leaf temperature (energy balance), airflow rate, incident PAR and stomatal conductance. The transpiration rate is also recorded.

• Housing
  Aluminium Alloy
• Head
  Aluminium Alloy with pespex/plexiglass radiation shield covering the head to minimize heating. A fan-ventilated heat sink is fitted.
• Window
  Coated glass interference filter which transmits largely below 0.7 microns (<50% transmission at 0.71 microns) to further decrease IR radiation on the leaf.
• Window Dimensions
  25mm x 5mm
• Weight 
  0.44 kg
• Stomatal Conductance 
  0 - 9,999 mmol m-2 s-1
• Measurement Range
• Humidity/Temp. Sensors
  2 Digital CMOS Sensors
• Calibration Accuracy %RH
  2% (differential better than 1% by regular programmable sensor matching)
• Temp.= 0.5°C
• PAR Sensor
  Fully Cosine corrected (400-700nm) PAR Sensor
• Range
  0-3,000 µmol m-2 s-1
• Precision
  10 µmol m-2 s-1
• Air Supply Pump
  Miniature 6V rotary air pump (0-200 ml min-1)
• Flow Control & Measurement
  Mass-flow meter accurate to ± 2% FSD
• Input Humidity Control
  From dry to ambient humidity by proportional diversion of the input air through a drying column.

More about PMR-5