Calibration

• The EGM-4 does not require CO2 recalibration (we recommend periodic checks to confirm system integrity).

• The EGM-4 employs a non-dispersive, infrared measurement technique, coupled with microprocessor-based signal processing, to achieve excellent stability and specificity to CO2.

• Innovative “Auto-Zero” technology ensures fast warm-up, long term stability, accuracy and analyzer calibration. It also minimizes the effects on span (gas sensitivity) of sample cell contamination, source aging, changes in detector sensitivity and changes in pre-amplifier gain.

• The EGM-4 can be supplied with two different optical benches.

• One bench is optimized for measurement of CO2 in the ranges of 0-1,000 ppm up to 0-30,000 ppm

• Another optimized for 0-50,000 or 0-100,000 ppm.

• The EGM-4 is a compact, lightweight (1.9 kg) instrument that is packaged in a rugged aluminum enclosure. It can be supplied with either a 12V lead acid battery (up to 4 hours continuous use) or 12V NiMH battery (up to 8 hours continuous use) making it an ideal instrument for field applications. For laboratory studies, it can be operated continuously from mains power using the AC power supply that is included.

• The EGM-4 features an integral, long life air sampling pump that can be controlled for applications that require both dynamic and static measurements.

• For dynamic measurements, the pump operates at a flow rate of approximately 350 ml/min.

• Static measurements are performed by simply disabling the integral pump and injecting a gas stream directly into the gas analyzer for analysis.

• Measurements can be recorded manually or automatically at user selected intervals.

• Data is safely stored in battery backed RAM and can be later output to a PC in standard ASCII format.

• Analog and digital output is available for use with external data loggers or for display, collection and recording from an external PC using the Windows® software included.

• The EGM-4 is an extremely powerful and versatile instrument. The following accessories/sensors can be used with the EGM-4 enhancing measurement capability:

1. Humidity sensor

2. Soil respiration chamber

3. Soil temperature

4. PAR

5. Temperature/PAR

6. Canopy assimilation

7. Oxygen

8. Steady state porometer

•  Plant physiology

• Air-sea surface exchange (pCO2)

• Soil CO2 efflux

• Animal/insect respiration

• Whole canopy assimilation

• Environmental toxicology

• Global change studies

• Volcanology

• CO2 sequestration

• Bioremediation

• Forest & agricultural meteorology

• Porometry

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