Model 902P Process O2/ CO2 Analyzer

OVERVIEW

The Model 902P is designed for continuous or spot check monitoring of O2 and CO2 levels in all types of processes, gas blending, biotech and other systems. The Model 902P is available with any range from 0 to 100% O2 and 0 to 1% up to 0 to 100% CO2 vol/ vol full scale. Options include battery operation, analog outputs, internal sample pump and a sensors remotely mounted from the base unit.

FEATURES

-Ranges 0-100%
oxygen/ carbon dioxide
-Analyzes oxygen/ carbon
dioxide in all types of
applications
-Sampling pump ( optional)
-Portable/ battery operation
( optional)
-Economically priced
-0-5 Vdc analog outputs and
data logging available

APPLICATIONS

-Bioreactors
-Gas Blending Systems
-Fruit Storage Areas
-Fermentation
-Welding Gases
-Controlled Atmosphere
Rooms

Sensor Design
The Model 902P uses a solid-state infrared sensor which has no moving parts, a compact optical cell, and microprocessor-based calibration factors using a 6th order polynomial equation to linearize the full range measurement up to 100% . Infrared CO2 measurements are inherently non-linear, especially over a high range of concentrations. The math algorithm used yields more accurate results over a much wider range of concentrations than other methods.

The Model 902P IR sensor combines cutting edge 32 bit digital signal processing with the solid reliability, compact size and state of the art microprocessor technology that makes this full-featured CO2 measurement system less complex and more robust than other instrumentation. Its reliability is backed it up with a two year warranty, twice the industry standard. The advanced design allows an output requiring less frequent calibration. It provides a stable, drift-free linearized voltage or current output that is much less susceptible to external electro-magnetic interference than conventional analog electronics.

The sensor assembly is cable connected to the control circuit board. It can be used with diffusion or pumped sample draw systems. The measurement accuracy is not affected by sample flow rate.

The Model 902P design incorporates a long-life, heavy duty maintenance free electrochemical oxygen sensor. The sensor is totally sealed, operates at room temperature and is internally compensated for slight temperature variations. Unlike other O2 sensors, it is not dependent on a controlled flow rate for accuracy, is not heated and is not affected by high levels of CO2 or hydrocarbon gases.

Sampling VersatilitY

The sensor designs are compact, have a low internal volume and require only a low sample flow of about 10 to 100 cc/ min. The sample should be clean and dry ( non-condensing) . Moisture or dirt deposits on the internal surfaces of the sensor can cause errors in the reading. A disposable type particulate filter can be inserted in the sample line if needed.

The sensors operate at atmospheric pressure, and the accuracy of the measurement is not dependent on the flow rate of the sample gas.. For those systems where a source of sample flow is not available, the Model 902P can be equipped with an optional internal miniature diaphragm pump with a switch on the front panel for sampling in 1 to 10 second intervals. Also, the compact sensor heads can be mounted directly in the system to be measured and connected via cable to the analyzer. In the latter case, sample diffuses into the sensor through port openings in the sensor body. The Model 902P can have the sensors located remotely up to a distance of 3 feet from the unit.

Battery Operation

With its low power requirement, the Model 902P can be operated with an optional battery for those applications where AC power is not readily available. A totally sealed, long-life internal 12 Vdc gel battery accepts a full or partial charging cycle and will operate the unit for up to 8 hours. The charger module plugs into a standard 115 or 230 Vac outlet for charging or continuous operation. Alternatively, the unit can be powered from an external 12Vdc source.