EGM-5: Portable CO2 Gas Analyser

A rugged, highly portable instrument for use in the lab & field. The perfect solution for soil CO2 efflux & net canopy CO2 flux measurements.

  • High-precision, compact non-dispersive infrared CO2 analyser with automatic temperature & pressure compensation
  • CO2 ranges up to 100000 ppm (10%)
  • Accuracy: < 1% of span concentration over calibrated range
  • Lightweight & truly field portable (1.5 kg)
  • Internal, rechargeable 7.2V lithium ion battery providing up to 16 hours continuous operation
  • Built-in sampling pump with electronic flow sensor
  • Numerical & graphical display of data
  • Large, high-resolution touch display with excellent readability under sunlight conditions
  • Unlimited data storage using USB Flash drive (thumb drive)
  • Voltage & digital (USB) output
  • Visual & audible alarm (low & high)

EGM-5 Portable CO2 Gas Analyzer

The EGM-5 is a compact, lightweight instrument (1.5 kg) with a custom, rugged aluminum enclosure making it a very portable and durable product for demanding field measurements. Additionally, the EGM-5 features an integral, rechargeable 7.2V battery providing up to 16 hours of continuous operation in the field.  The EGM-5 also features a miniature, long life air sampling pump that can be used for both dynamic and static measurements. Data can be recorded manually or automatically at user selected intervals.

The EGM-5 can be supplied with two different optical benches calibrated specifically to the range required. One bench is optimized for measurement ranges of CO2 up to 30000 ppm and another for ranges above 30000 up to 100000 ppm. For users that want to recalibrate the gas analyzer to a new level, this can easily be achieved as long as it is within the range for that particular optical bench.

The design of the EGM-5 ensures an inherent calibration stability that has been confirmed by over 35 years of experience in gas analysis technology. It features a non-dispersive, infrared measurement technique coupled with microprocessor based in signal processing resulting in precise measurement of CO2. Our innovative “Auto-Zero” technology and insulated, thermostatically controlled optical bench ensures fast warm-up, long term stability, accuracy and analyzer calibration.

The EGM-5 is an extremely versatile instrument that can be used with a range of optional sensors and chambers adding to measurement capability.  The currently available options include:

  • H2O Sensor
  • O2 Sensor
  • Quantum Sensor
  • Temperature and PAR Probe
  • Soil Temperature
  • Soil Moisture
  • Soil Respiration Chamber for soil CO2 efflux
  • Canopy Assimilation Chamber for net canopy flux


  • Ambient CO2 monitoring
  • Soil CO2 efflux
  • Net canopy flux
  • Borehole monitoring of CO2
  • Global change studies
  • CO2 sequestration
  • Forest & agricultural meteorology
  • Air-sea surface exchange (pCO2)
  • Animal/insect respiration
  • Environmental toxicology
  • Volcanology
  • Bioremediation

PC Control Software

Our GAS (Gas Analysis Software) allows users to monitor and record environmental sensor data from a PC.

PP Systems - EGM-5 Portable CO2 Gas Analyzer

PP Systems - EGM-5 Portable CO2 Gas Analyzer

All electrical and pneumatic connections, power, CO2 scrubber, USB flash drive and terminal block are conveniently located on the rear of the EGM-5 console.

PP Systems - EGM-5 Portable CO2 Gas Analyzer

An optional, rugged transport case is available for use with the EGM-5, as well as the SRC-2 Soil Respiration Chamber and HydraProbe II Soil Moisture & Soil Temperature Probe or STP-2 Soil Temperature Probe.

Main CO2 Measurement Screen

PP Systems - EGM-5 Portable CO2 Gas Analyzer

Monitor CO2 trends and flux rates

PP Systems - EGM-5 Portable CO2 Gas Analyzer

Monitor multiple sensors on one screen

PP Systems - EGM-5 Portable CO2 Gas Analyzer

Soil respiration measurements displayed on screen

PP Systems - EGM-5 Portable CO2 Gas Analyzer

PP Systems - EGM-5 Portable CO2 Gas Analyzer

PP Systems has long been recognized as a manufacturer of high-level scientific instrumentation for the soil sciences.  For more than 30 years their instruments have been widely referenced in numerous, prestigious publications and articles.  We offer a very affordable soil respiration system based on the NEW EGM-5 Portable CO2 Gas Analyzer and SRC-2 Soil Respiration Chamber.  The SRC-2 Soil Respiration Chamber and CPY-5 Canopy Assimilation Chamber can also be used with the CIRAS-3 Portable Photosynthesis System and TARGAS-1 Portable Photosynthesis System for closed system measurement of soil respiration and net canopy CO2 flux.

The SRC-2 Soil Respiration Chamber connects directly to the EGM-5 console.  It includes a fan for flushing the chamber prior to measurement and for sampling.  It also includes an internal sensor for measurement of air temperature near the soil surface.

SRC2 Soil Respiration Chamber

The SRC-2 Soil Respiration Chamber with built-in temperature sensor can be used with the EGM-5 and CIRAS-3 for easy, accurate and rapid closed system measurement of soil CO2 efflux.

Dimensions: 150 mm (Height) x 100 mm (Diameter)

Optional collars (as shown in picture) are available from PP Systems for use with the SRC-2 chamber.

Soil Temperature

Our rugged STP-2 Soil Temperature Probe can be used to measure soil temperature.  It is commonly used with our SRC-2 Soil Respiration Chamber.

Soil Temperature Range

– Range: 0-50 oC
– Accuracy: ± 0.3 oC at 25 oC

Soil Moisture & Soil Temperature

The Hydra Probe II (Stevens Water Monitoring Systems, Inc.) features a “dielectric impedance” measurement principle and it can be used with the EGM-5 for accurate measurement of soil moisture and soil temperature from a single probe.

Soil Moisture Range

– 0-100% (dry to fully saturated)

Soil Temperature Range

– Range: -10-55 oC
– Accuracy: ± 0.3 oC at 25 oC

Net Canopy CO2 Flux

The CPY-5 can be used with the EGM-5 and CIRAS-3 for closed system measurement of net canopy CO2 flux on low lying vegetation.

Dimensions: 145 mm (Height) x 146 mm (Exposed Diameter)
Exposed Area: 167 cm2

It includes sensors for measurement of air temperature and PAR (Photosynthetically Active Radiation).

Download the EGM-5 Brochure

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