Enquire Now

Complete your details below and we will be in touch as soon as possible.


Brand Info

CIRAS-SC Absolute CO2/H2O IRGA, for PC operation

Part Number: CRS093Product Details

For over 25 years, PP Systems has been manufacturing high quality CO2 & H2O infrared gas analysers for researchers and customers from a wide variety of disciplines throughout the world. We are considered a leader in CO2 and H2O infrared gas analysis measurement instrumentation and our analysers are in use in over 100 countries worldwide. Our innovative Auto-Zero Measurement Principle ensures the greatest accuracy, reliability and long term stability that many of our customers have come to expect throughout the years.

Our CIRAS-2 SC and CIRAS-2 DC laboratory gas analysers feature a high technical specification and quality workmanship ensuring accuracy, precision and reliability. They are both designed to be operated through a standard PC for stand-alone operation. Having said that, an optional 12V lead acid battery can be supplied for both instruments for portable applications if required.

The CIRAS-2 SC is a single channel infrared gas analyser for accurate, absolute measurement of CO2 and H2O in µmol mol-1 of a single gas stream.

The CIRAS-2 SC is a single channel infrared gas analyser for accurate, absolute measurement of CO2 and H2O in µmol mol-1 of a single gas stream. It features 2 independent, non-dispersive gas analysers for accurate, simultaneous measurement of both CO2 and H2O. There are no moving parts. The analysers (reference and analysis) include an infrared source, gold plated and highly polished sample cells and detectors. The analysers act as absorptiometers measuring only in the 4.26µm (CO2) and 2.60µm (H2O) wavebands ensuring accurate, rapid and stable results. The analysers are thermostatted and completely insulated to ensure accurate measurements under changing ambient temperatures. This eliminates problems associated with software corrections.

Our history and expertise in CO2 & H2O infrared gas analysis design speaks for itself. The design of the CIRAS ensures an inherent calibration stability. This has been confirmed by over 25 years experience of the technology. The CIRAS system does not require calibration. To ensure proper operation and calibration of the analysers, we do recommend periodic checks to confirm system integrity.

Measurement Ranges
  • CO2: 0-2000 µmol mol-1 (optimal), 0-10000 µmol mol-1 (maximum); H2O: 0-Dewpoint
For measurements at elevated CO2 concentrations, the CIRAS-2 SC is factory calibrated up to 10000 µmol mol-1 as standard.

  • High precision, non-dispersive, absolute infrared gas analysers for CO2 and H2O
  • CO2 Range: 0-2000 ppm (up to 10000 ppm)
  • Fast response
  • Analog & digital (RS232) linear output
  • Excellent stability achieved by built-in Auto-Zero facility
  • Fully compensated for changes in temperature, pressure and gas interactions
  • Built-in sampling pump with mass flow controllers
  • Insensitive to vibration, no moving parts ensuring high reliability
  • Plant/Crop physiology
  • Atmosphere & pollution CO2 monitoring
  • CO2 enrichment studies
  • Animal/insect physiology
  • Industrial process control
CIRAS-SC Single Channel CO2/H2O Analyser product brochure


      Part Number: CRS093
      Air Sampling 100cm³/min using an integral DC pump. Both analysis and reference pumps fitted with mass flow controllers. The analyser may be used in open and closed systems.
      Analog Output (CO2/H2O) 8 bit D/A converter giving 0.5% resolution. Output voltage 0-5V. Both minimum and maximum voltage are defined by user.
      Analyser Control All analyser functions/controls are controlled by the PC (software supplied)
      Analysis Method Non-dispersive infrared, configured as an absolute absorptiometer with microprocessor control of linearisation. The analysers simultaneously measure Absolute CO2 and humidity of the sample gas The CIRAS-SC has 2 analysers for absolute measurement.
      Data Storage Internal battery backed RAM, stores up to 1640 records. Memory is maintained during battery change.
      Dimensions (H × W × D) 100mm × 280mm × 205mm
      Housing Powder coated, 1.5mm thick aluminum enclosure. An optional, lightweight version is available with a 1mm thick housing.
      Instrument Status Detection Indication of instrument malfunction, including low battery voltage (< 10.5V) through the RS232 output. Auto restart if momentary failure.
      Linearity Better than 1.0% throughout the range, with calibration at 2000 ppm CO2 or 40 mb
      Measurement Range CO2: 0-2000 µmol mol-1 (optimal range), 0-9999 µmol mol-1 (maximum range); H2O: 0-75 mb. Corrections are made for temperature, pressure and foreign gas broadening.
      Operating Environment 0°C to 45°C, non-condensing. In dirty environments, external air filtration is required.
      Power Consumption 12.0W (initial warm-up); 3.5W (normal operation)
      Power Supply External 12V DC power supply with small ripple. Input voltage must not exceed 15V. An optional internal 12V battery can be supplied giving up to 2 hours continuous use.
      Precision (Absolute) CO2: 0.2 µmol mol-¹ at 300 ppm, 0.5 µmol mol-¹ at 1750 ppm, 3.0 µmol mol-¹ at 9999 ppm; H2O: 0.015 mb at 0 mb, 0.020 mb at 10 mb, 0.030 mb at 50 mb
      Real Time Clock Accuracy: Better than 1 min/month at 25°C; Operating Temperature: 0°C to 70°C
      Recording Options By PC or by the instrument. Automatic logging at user selectable intervals between 10 seconds and 1 hour, controlled by internal real-time clock.
      Response Time Electrical: 0.5 seconds; Display/Analog Output: 1.6 seconds; Pneumatic: < 5 seconds
      RS232 Output Stored/current data output in standard ASCII format at 1200 baud
      Stability (CO2 Analysis) Automatic Zero at regular intervals, corrects for sample cell contamination, source and detector ageing and pre-amplifier gain changes
      Weight 2.7kg (optional, internal battery adds 0.6kg to the weight if used)

      Related Items

      • CIRAS-DC Differential CO2/H2O IRGA, for PC operation
      • SBA-5 CO2 Gas Analyser (High Range)
      • SBA-5 CO2 Gas Analyser, with enclosure
      • SBA-5 CO2 Gas Analyser (High Range), with enclosure
      • WMA-4 Single Channel CO2 Analyser
      • WMA-4 Single Channel CO2 Analyser (High Range)
      • WMA-4 Dual Channel CO2 Analyser
      • WMA-4 Dual Channel CO2 Analyser (High Range)
      • EGM-4 Environmental Gas Monitor for CO2
      • EGM-4 Environmental Gas Monitor for CO2 -12V NiMH
      • EGM-4 Environmental Gas Monitor for CO2 (High Range)
      • EGM-4 Environmental Gas Monitor for CO2 -12V NiMH (High Range)
      • MultiGas™ Purity Real-Time Trace Impurity Detection
      • MultiGas™ 2030 Continuous Gas Analysis
      • MultiGas™ 2030 HS 5Hz Combustion Analysis
      • Process Sense™ Chamber Clean Endpoint Detector
      • MicroVision Plus Smart Head RGA
      • e-Vision™/e-Vision+™ Web-enabled RGA for Vacuum Monitoring and e-Diagnostics
      • 300mm Resist-Torr® Photoresist Detection Monitor
      • 200mm Resist-Torr® Photoresist Detection Monitor
      • HPQ2 High Pressure Residual Gas Analyser
      • HPQ2S High Pressure Residual Gas Analyser, with special gas-specific algorithms to compensate for sensitivity variations
      • Cirrus™ Quadrupole Mass Spectrometry