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Application note

2250 Dual IRGA Lab Analyzer

The ADC 2250 is used to provide highly accurate, plant physiology gas exchange measurement. It is particularly well suited for measuring very low gas exchange rates or investigating rapid plant biophysical responses to environmental changes.

The ADC 2250 is used to analyze soil biomass activity by measuring CO2 exchange. For more extensive soil respiration studies, external sensors such as soil moisture and soil temperature devices can be connected to the system. All parameters including soil moisture, soil temperature and user programmed soil respiration calculations may then be displayed and recorded.

 

 

Features

  • Dual CO2 and Dual H2O Omega Infrared Gas Analyzer
  • Automatic Atmospheric Pressure and
    Temperature Compensation
  • Open and Closed System Configuration
  • Extensive Flow Control and Monitoring (20-600 mls/min)
  • Differential and Absolute Modes
  • Integral Two Channel Gas Multiplexer
  • Eight Scaleable Analogue (or Voltage) Inputs
  • Large Full-Color Display
  • Splash Resistant "QWERTY" Keypad
  • Multi-tasking Menu Drive Software with User Expandable
    Help Facility, Mouse Input,
  • Data and Multiple Parameter Graphic Display
  • Dual PC/MCIA Card Drive, up to 4MB each
  • Four Analogue Outputs
  • Serial Ports (2 x RS232C)
  • Multi-positional Carrying Handle
  • 12 V, 120 V or 220 V Power Options
  • Parallel Printer port
Specifications

Measurement type
CO2 and H2O differential, non dispersive infrared gas analysis. Atmospheric pressure and temperature compensation. CO2 corrected for H2O, broadening and dilution. Auto zero. Open and Closed mode. Two experimental channels

Range measurement
CO2: 0 - 2000 ppm, H2O: 0 - 75 millibar

Resolution
CO2 0.1 ppm at 3350 ppm, H2O 0.1 millibar

Response time
Selectable between 0.1 and 10 seconds (in increments of 0.1 seconds)

Cell volume
5 cm3

Repeatability
CO2 0.2 ppm at 350 ppm

Signal Noise
CO2 typically 0.2 ppm peak to peak at 350 ppm with 1 second response time. H2O typically 0.02 millibar peak to peak at 20 millibar with 1 second response time

Differential zero drift
CO2 at 350 ppm <1ppm/hr at 25º C typically <2 ppm in 24 hours. 0.12 ppm per ºC H2O at 20 millibar typically < 0.5 millibars in 24 hours. 0.02 millibar per ºC

Span drift
CO2 <1 ppm in 24 hours at 25º C and 350 ppm. H2O <1% of f.s.d. in 24 hours at 25º C

Internal flow
control 20-600 ml min-1

Flow measurement accuracy
±1% of f.s.d.

Maximum flow rate
10 liters min-1

Pressure measurement
750 - 1250 millibar

Display
1/4 VGA color LCD

Inputs
8 scalable channels: 4 fast channels 10Hz, 4 channels 1Hz 0-5V

Data storage
Dual PC card drive (PCMCIA). Each drive compatible with a range of PC cards up to 4M Byte

Internal software
User friendly ‘graphical user interface’ familiar to PC and MAC users. User expandable and upgradable
I/O 2 RS232C serial ports for connection of mouse, printer, and PC. (One port RS-232/RS485)

Outputs
4 analogue outputs (0 - 4V) - Parallel printer port

Gas connections
Suitable for 4 mm bore tubing

Keyboard
Fully QWERTY, (wipe clean) keyboard

Operating temperature
0 to 45º C

Power requirement
230/115V 50/60Hz, 12V DC with adaptor

Dimensions
390 x 360 x 160 mm

Weight
24 lbs. (11 Kg)