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Quality Instrumentation for the Life Sciences |
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CO2 Gas Analyzer OverviewPP Systems specializes in the design and manufacture of CO2 infrared gas analyzers (IRGA's). These instruments are single channel, absolute CO2 analyzers for measurement of a single gas stream. All analyzers are based on a standard module (SBA-4) which employs a non-dispersive measurement technique, coupled with microprocessor based signal processing to achieve good stability and specificity to CO2. All analyzers are fully compensated for temperature and pressure. Fast warm-up, adaptation to changing ambient conditions and excellent stability is achieved by automatic resetting of the analyzer zero at regular intervals.
Normal operation of the analyzers requires a continuous flow of the sample gas. However, static measurements are available with the SBA-4 and EGM-4 enabling the use of aerosol calibration mixtures as well as the injection of syringe samples. All analyzers feature an analog output making them compatible with industry standard PID controllers when CO2 control is required. In addition, all analyzers feature a 4-20 mA current output and digital (RS232) output for transfer of data in ASCII format. In addition, we offer a full range of soil and canopy chambers (soil CO2 flux, net canopy CO2 flux, etc.) and environmental probes for use with our CO2 infrared gas analyzers to enhance measurement capability. Currently, we offer probes and sensors capable of measuring PAR (Photosynthetically Active Radiation), %RH, temperature and O2. Auto-ZeroAll PP Systems' CO2 infra-red gas analyzers 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 minimizes the effects on span (gas sensitivity) of sample cell contamination, source aging, changes in detector sensitivity and changes in pre-amplifier gain. Our company considered using a 2 wavelength detector several years ago, but concluded that true auto zero instruments such as ours provided greater stability and reliability for the following reasons:
The only disadvantages to the auto zero approach is that the analyzer requires a flow, a solenoid valve and a chemical absorber (soda lime) which requires replacing at regular intervals. The advantages of an auto-zero system, in our opinion, far outweigh the disadvantages. Software
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© 2007 PP Systems.
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