Gas Analysis

All PP Systems’ CO₂ infrared gas analyzers feature an Auto-Zero facility which occurs at regular intervals, allowing for fast warm-up, adaptation to changing ambient conditions, and excellent stability of the CO₂ signal. The action of auto zeroing minimizes the effects on span (gas sensitivity) of sample cell contamination, source aging, changes in detector sensitivity, and changes in pre-amplifier gain.  Simply put, you should never have to worry about the accuracy of your CO₂ calibration as long as the Auto-Zero is in use.  Simple, periodic checks of the CO₂ calibration are recommended.

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.

PP Systems manufactures a range of external environmental sensors & chambers for use with our CO₂ gas analyzers enhancing measurement capability. View the Accessory Compatibility by Instrument chart to determine which sensors are compatible with each instrument as well as the many integrated options to further customize your system.