The CIRAS-2 system is in its unique optical bench assembly. The CIRAS-2 is a True Differential & Truly Portable Combined Fluorescence System. It features four independent, non-dispersive infrared gas analyzers for accurate, simultaneous measurement of both CO₂ and H₂O eliminating the problems associated  with "gas switching" systems. There are no moving parts. The analyzers are secure within the console, with filters to protect the gold plated sample cells from dust and water. Effective insulation ensures good thermal stability. The CO₂/H₂O analyzers are virtually maintenance free. The infrared gas analysers, perhaps the most sensitive part of the system, are safely secured in the main console which has been specially designed for ruggedness. The entire optical bench is protected and adequately filtered from harsh field conditions. Routine maintenance includes inspection / replacement of air conditioning chemicals, filter elements, "O" ring lubrication and proper installation of CO₂ cartridges. The CIRAS-2 system can easily be used as a stand-alone CO₂/H₂O infrared gas analyzer without the need for a leaf cuvette. This is particularly useful for whole plant work, balloon studies and for accurately monitoring CO₂/H₂O in growth chambers, nurseries, etc.

• Analysis Method
  Non-dispersive infrared, configured as an absolute absorptiometer, with microprocessor  control of linearization.
• Four channels (IRGA) simultaneously measure
  Absolute CO₂ and humidity of reference gas.
  Differential concentration of analysis gas.
• Measurement Range
  CO₂ Optimized Range. --0-2,000µmol mol-¹. (ppm).
  CO₂ Maximum Range. --0-9,999µmol mol-¹. (ppm)
  H₂O --0-75mb (maximum = dew point at ambient temperature).
• Linearity
  For optimal range, better than 1.0% of range at any point assuming calibration at 2,000µmol mol-¹.
• Stability
  Automatic zero at regular intervals corrects for sample cell contamination, source and detector aging, and pre-amplifier gain changes.
• Response Time
  Electrical --0.5 seconds. Display / Analog Output --1.6 seconds. Pneumatic --< 5 seconds.
• Air Sampling
  50-100cm³ min-¹ using integral DC pumps. Both analysis and reference pumps are fitted with mass flow controllers. The analyzer may be used in both open and closed systems.
• Environmental Sensor Inputs
  3 input channels are available. There is integral conditioning of our %RH, temperature, and PAR sensors.
• RS232 Output
  Stored/current data output in standard ASCII format at 9600 baud.
• Power Supply
  Internal rechargeable 12V NiMH. Analyzer battery life of approximately 8-10 hours (with both batteries). Individual batteries can be easily changed without shutting down the system.
• Power Consumption
  12W (initial warm-up) / 5W (Normal operation).
• Instrument Status Detection
  Visual indication of malfunction, including low battery voltage
• Weight
  7.5Kg. (Including both batteries & PC).
• Operating System
  Microsoft Windows CE
• Display
  Large (7.5"), color reflective 640 x 480 resolution (256 colors) optimized for field use.
• Record Options
  Manual logging by key press, or automatic logging at user selectable intervals between 1 and 250 minutes (i.e. response curves).
• Data Storage
  Uses onboard FLASH RAM for data storage. (PCMCIA slot also fitted
• Air Supply
  Up to 500 cm³ min-¹ measured and controlled by a mass flow meter, for supply to external equipment (i.e. PLC Leaf Cuvette).
  Ext. gas supply up to 2,500 cm³ min-¹.
• Automatic control of CO₂ and H₂O:
  CO₂ range: --0-2,000 µmol mol-¹.
  H₂O range: --0-Dewpoint
  The PLC6 (Universal), PLC (Narrow) and PLC (Conifer) Leaf Cuvettes are all for use with the CIRAS-2.
• Cuvette Materials
  Components: --Aluminium Alloy
  Window: --Glass IR interference filter or TPX
  Leaf Seal: --Closed cell foam gaskets.
  Impeller: --Stainless Steel
• Window Size
  With no insert (Small Narrow): 25 mm 18 mm
  Insert 1 (Broad): 18 mm diameter
  Insert 2 (Rice): 25 mm x 7 mm
  Custom inserts are available within the 25 mm x 18 mm range.
  PLC6 (Narrow): 50 mm L x 20 mm W
  PLC6 (Conifer): 70 mm L x 50 mm W (Cylindrical)
• Boundary Layer Resistance
  0.15 - 0.32 m² s-¹ mol-¹
• Air Temperature Sensor
  Precision Thermistor
  Software linearization: --  +/- 0.10°C from 0° - 60°C
  Accuracy: -- +/- 0.3° at 25°C
• PAR Sensor
  Filtered Silicon Cell, fully cosine corrected
  Response: --          400 - 700 nm
  Range: --0-3000 µmol m-² s-¹
  Precision: -- 10 µmol m-² s-¹
• Leaf Temperature Sensor
  Radiation Sensor for non-contact measurement.
  Accuracy: --+/- 0.3°C at 25°C
• Light Units
  LED Light Source
  Fan Cooled Halogen Light Unit
  Range: 0-2,000 µmol m-² s-¹
• Cuvette Handle Dimensions
  Approx. 30 mm D x 27 mm L (Excluding Head)
• Typical Weight
  0.750 Kg.

More about CIRAS-2

Optional Accessories

Leaf Cuvettes & Light Units
for Ciras-2

Accessories
for Ciras-2

Soil Respiration Chamber