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NEW! CIRAS-4: The lightning-fast portable powerhouse elevating research worldwide!
Don’t let its compact size fool you. The highly accurate CIRAS-4 Portable Photosynthesis System is a lightning-fast portable powerhouse that will elevate your research experience.

Its advanced software is exceptionally intuitive and customizable. You can manage environmental controls—as well as how you view your data—all from the touchscreen. It's so easy to use, you can begin taking measurements right out of the box.

Today's research demands fast response technology & the most precise data available. True portability, speed, & accuracy are key.
CIRAS-4 Portable Photosynthesis System
Unrivaled performance, portability & power
  • Truly portable! Lightweight console (4.8 kg with two battery packs) and leaf cuvette (0.7 kg)
  • True differential gas analyzer featuring four independent, non-dispersive infrared gas analyzers for both CO2 and H2O.
  • Small system volume optimized for the fastest, most accurate measurement of photosynthesis available.
  • Fastest, simplest rapid A/Ci curves available. based on both upward and downward CO2 ramps.
  • Fully automatic, independent, and programmable control of CO2, H2O, temperature, and light.
  • 32 GB of memory. Quick and easy file transfer.
  • Versatility at its best. Multiple lightweight, field-ready accessories for use with the CIRAS-4 for several applications.
Advanced touch navigation & outstanding readability
The CIRAS-4 offers highly responsive advanced touch navigation for all system operations from its large, full-color sunlight-readable touchscreen offering unsurpassed readability even under high sunlight conditions.
Your data your way
It's all about the data. Not only can you trust the CIRAS-4 to provide highly accurate data
quickly, you can customize your entire data collection and research experience all from the touchscreen.

  • Unique multi-user profile system. Set up to eight unique profiles based on application, operator, and/or experiment.
  • Comments are quick and easy to include with data files.
  • Configure your own stability criteria to let you and the system know when to trigger a measurement.
  • Graph up to six parameters at a time including zoom, pause, and resume, and customization of the X and Y axis for each parameter is quick and easy.
PLC4 Leaf Cuvettes: Lightweight & field-flexible
Fast equilibration & response time
Overall small system volume means almost immediate response times and fast equilibration.

Head plates are secured by magnets for quick and easy change out in the lab or field.

Minimal boundary layer resistance
Advanced air mixing inside the chamber reduces boundary layer resistance.
Temperature control range
All PLC4 Leaf Cuvettes offer a temperature control range of approximately 12°C below ambient up to 15°C above ambient with 0.1°C precision. 

A technologically advanced infrared (IR) sensor provides accurate, non-contact measurement of leaf temperature. Leaf temperature can also be determined by energy balance.
PLC4 Universal Leaf Cuvette (shown above)
  • Measures most flat, broad leaf plants.
  • Three interchangeable window head plates come standard.
PLC4 Broad/Narrow/Conifer Leaf Cuvette
PLC4 LED Light Units (RGBW-FR) - Now with far-red LEDs!
Automatically control both light intensity & proportion of light by wavelength
Each light unit features a bank of red, green, blue, white, and far-red LEDs (RGBW-FR) allowing for automatic control of both light intensity up to 2500 µmol m-2 s-1 and proportion of light by wavelength. 

Far-red
Control far-red up to 30% of PAR to more accurately recreate the natural light environment. 
CFM-4 Chlorophyll Fluorescence Module - Now with OJIP fast induction kinetics & more!
Measure chlorophyll fluorescence and photosynthesis simultaneously. 
  • The CFM-4 provides OJIP fast-induction kinetics. OJIP-related data are easily stored and exported for further analysis providing additional fluorescence-related calculations.
  • Improved fluorescence detector module provides high-frequency measurements with optimized signal-to-noise ratio.
  • Easily store and export OJIP-related data points for further analysis to provide many additional fluorescence-related calculations.
  • Both dark-adapted and light-adapted chlorophyll fluorescence measurement parameters.
  • Automatic control. Users can automatically control temperature and light intensity as well as proportion of red, blue, green, white and far-red LEDs.
  • Multiple leaf apertures. Measure chlorophyll fluorescence over the entire leaf area using any of the three leaf head plates that come standard with the PLC4 Universal Leaf Cuvette.
  • The CFM-4 is elegantly designed with all light sources and fluorescence detection capability built directly into one lightweight, compact unit. The CFM-4 can also act as an actinic light source for leaf gas exchange as well as a stand-alone fluorometer when leaf gas exchange data is not required.
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The Ultimate Research Experience
We have always understood the importance of working closely with experienced end-users as well as the next generation of scientists to continually refine the role of instrumentation as a seamless extension of the thought process of every student of science.

Our drive to constantly innovate provides you with the most advanced, rugged, and easy-to-use instruments with unsurpassed accuracy available.
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