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EGM-4 Environmental Gas Monitor for CO2 -12V NiMH

Part Number: AGA002-NMProduct Details

For over 25 years, PP Systems has been manufacturing high quality CO2 infrared gas analysers for researchers and customers from a wide variety of disciplines throughout the world. We are considered a leader in CO2 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. In addition, we offer a range of environmental probes for use with our analysers enhancing measurement capability.

EGM-4 Environmental Gas Monitor for CO2
A highly portable instrument ideal for both lab and field.

  • High precision, compact CO2 analyser
  • Accuracy: <1% of span concentration over calibrated range
  • Lightweight, field portable
  • Built-in sampling pump
  • Automatic pressure and temperature compensation
  • Voltage, current and digital (RS232) output
  • Visual and audible alarm
  • Custom, tactile keypad
  • Integral data logging capability
  • Plant Physiology
  • Soil CO2 efflux
  • Whole canopy assimilation
  • Global change studies
  • CO2 sequestration
  • Forest & agricultural meteorology
  • Air-sea surface exchange (pCO2)
  • Animal/insect respiration
  • Environmental toxicology
  • Volcanology
  • Bioremediation
Auto-Zero Measurement Principle
All PP Systems' CO2 infra-red gas analysers feature the Auto-Zero facility. This feature, which occurs at regular intervals, allows for fast warm-up, adaptation to changing ambient conditions and excellent stability of the CO2 signal. The action of auto zeroing minimises the effects on span (gas sensitivity) of sample cell contamination, source aging, changes in detector sensitivity and changes in pre-amplifier gain.

Based on our extensive in-house testing, we concluded that true Auto-Zero instruments such as ours provided greater stability and reliability for the following reasons:
  • Major effects of temperature are on the transmission characteristics of the interference filters and in 2 wavelength instruments, these are required to closely track.
  • Dirt in the cells, changes in cell reflectivity, changes in source position or relative emission over the source surface can differentially affect the sensors.
  • Changes in source temperature will affect the relative emissions at the two wavelengths.
  • Cross sensitivity problems to other gases are increased as neither wavelength must be affected.
  • Both sensors will require electronics and these must have identical temperature coefficients and must age exactly the same.
  • Reliability must decline as the component count increases.
  • Using two sensors degrades the signal/noise which is inversely proportional to the sensor area.
Therefore, for the reasons described above, we believe that the Auto-Zero measurement technique is best for all applications that demand the accuracy, reliability and long term stability.

EGM-4 Environmental Gas Analyser for CO2 product brochure


Part Number: AGA002-NM
Accuracy <1% of span concentration over the calibrated range but limited by the accuracy of the calibration gas mixture
Air Filter Filtered sample line (hydrophobic)
Alarm Audio alarm
Analog Output 4-20 mA, 0-1V, 0-2V, 0-3V, 0-4V, 0-5V (Linear)
Analysis Method Non-dispersive infrared, configured as an absolute absorptiometer with microprocessor control of linearisation
Calibration Default value preset in factory (built-in initialisation). Automatic calibration by keypad if required.
CO2 Control High and low set points
CO2 Measurement Ranges 0-1000 ppm (µmol mol-1); 0-2000 ppm (µmol mol-1); 0-5000 ppm (µmol mol-1); 0-10000 ppm (µmol mol-1); 0-20000 ppm (µmol mol-1); 0-30000 ppm (µmol mol-1); 0-50000 ppm (µmol mol-1); 0-100000 ppm (µmol mol-1). Custom ranges up to 100000 ppm upon request. Measurements are automatically corrected for temperature and pressure.
Data Storage 512K Battery backed RAM (1000 records)
Digital (RS232) Output 9600 baud/8 data bits, 1 start bit/2 stop bits/ no parity. ASCII format.
Dimensions (W × H × D) 18cm × 21.5cm × 6.3cm
Display High contrast 2 × 16 character LCD
Environmental Sensor Interface Two inputs available for use with external sensors (humidity, temperature, PAR, oxygen, soil respiration, etc)
Gas Connections Two barbed fittings (inlet and exhaust) for use with 1/8" (.125") ID tubing
Gas Flow Rate Through Analyser Minimum flow rate - 200 ml/min; Maximum flow rate - 500 ml/min
Housing High impact, aluminum enclosure
Keypad Custom, tactile keypad
Linearity <1% throughout the range
Operating Environment -5°C to 50°C, non-condensing. In dirty environments, external air filtration is required.
Power Consumption 12V @ 0.7A (warm-up); 12V @ 0.4A (normal operation)
Power Supply 12V rechargeable lead acid battery providing up to 4 hours continuous operation or 12V NiMH rechargeable battery providing up to 8 hour continuous use. Battery life may be reduced when EGM-4 is used with add-on sensors/accessories.
Real Time Clock Accuracy > 1 minute per month at 25°C, operating temperature 0-70°C. Automatic correction for month end and leap years.
Recording Manual (by keypress) or automatic at user selected intervals between 1 and 250 minutes
Response Time Display/Analog Output - 1.6 seconds
Sampling Pump Integral DC pump operating at a flow rate of 350 ml/min. Pump can be disabled for static measurements on demand.
Stability Automatic Zero at regular intervals, corrects for sample cell contamination, source and detector ageing and pre-amplifier gain changes
Weight 1.9kg

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