The EGM-4 does not require CO
2 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.Our
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