PP Systems CIRAS-3 User Manual

CIRAS-3 Operation Manual V. 1.09 76 support@ppsystems.com
Settings (Continued)
Cuvette Flow
Reference gas flow rate entering the cuvette within the range of 150 to 500 cc
min
-1
. Changing flow rate during an experiment is not recommended. Instead,
determine an optimal flow rate before beginning important measurements and
then maintain that flow rate throughout the experiment. Remember that the
CIRAS-3 controls water vapor, chamber humidity and VPD through the
desiccants and not by increasing or decreasing flow rate.
Analyzer Flow
Constant flow rate of sample gas introduced to IRGAs. The default value is
100 cc min
-1
and this is normally the value for most gas exchange applications
using a cuvette and should not need to be changed.
Light Source
LED. Select this if using one of our standard LED light units. Select your
desired Light Intensity from 0-2500 µmol m
-2
s
-1
. Maximum light intensity will
be dependent on type of light unit.
Ambient. For measurements under natural light conditions (No light unit).
RGBW Control
Allows you to set your desired LED color distribution. An individual color can be
set to 100%, or any color combination may be selected with a combined
distribution of red-green-blue-white to equal 100%. Here you can mimic the
spectral quality of sunlight, LED light banks, and other light sources, or create
experimental irradiance (i.e. stomatal physiology work). The best settings to
use to simulate sunlight is 38% Red, 37% Green, 25% Blue and 0% White
which are also the default values.
Temperature Sensor
Measurement
(Available options are
dependent on PLC3
type)
IR Thermometry to use the PLC3 Universal cuvette’s internal infrared sensor
(but only if the leaf covers the entire window opening). Do not select IR
Thermometry and instead select Energy Balance if, for example, you are
trying to place narrow leaf blades in parallel (such as grass leaves) or a leaf that
does not fill the entire window.
Energy Balance must be selected when the cuvette window does not have
complete coverage by the leaf. Energy Balance can be used at any time.
Thermistor if using the thin wire temperature sensor supplied with the PLC3
Conifer or Narrow cuvettes, otherwise select Energy Balance.

PP Systems CIRAS-3 Specifications

General

Brand	PP Systems
Model	CIRAS-3
Category	Measuring Instruments
Language	English