Model 906 CO2 Analyzer

OVERVIEW
The Model 906 Carbon Dioxide Analyzer is designed for continuous or spot check monitoring of CO2 levels in all types of processes, gas blending, biotech and other systems. The Model 906 is available with any range from 0 to 1% up to 0 to 100% vol/ vol full scale. Options include battery operation, analog outputs, internal sample pump and a sensor remotely mounted from the base unit.

FEATURES

* Ranges of 1, 10, 30, and
0 to 100% carbon dioxide
* AC or battery operation
* Internal sampling pump
* Economically priced
* Two-year warranty
* 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 906 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 in the 906 yields more accurate results over a much wider range of concentrations than other methods.

The Model 906 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.

Sampling Versatility

The sensor design is compact, has a low internal volume and requires 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.

Sample flows into the sensor through the front panel fitting and vents out through a port fitting on the back panel. The sensor operates at atmospheric pressure, and the accuracy of the measurement is not dependent on the flow rate of the sample gas. There are no restrictions in the sample cell, and samples introduced at slightly higher pressure will quickly equilibrate to atmospheric pressure. For those systems where a source of sample flow is not available, the Model 906 can be equipped with an optional internal miniature diaphragm pump with an on-off switch on the front panel, or the compact sensor head 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 906 can have the sensor located remotely up to a distance of 2-3 feet from the unit.

Battery Operation

With its low power requirement, the Model 906 can be operated with an optional battery for those applications where AC power is not readily available, or for convenience if spot checking samples at different locations. 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 12-24 Vdc source.