The CAI Infrared Analyzer Series utilizes an optical bench. The single beam design requires no optical alignment. Sample cells have replaceable gold foil liners if sample contamination should occur. The microflow detector provides low sensitivity to vibration. Applications includes EPA compliance, combustion efficiency, vehicle emission, and process chemical analysis. DESCRIPTION The heart of the CAI Infrared Gas Analyzer Series is the unique optical bench. The single beam design requires no optical alignment. Sample cells have inexpensive, replaceable gold foil liners should sample contamination ever occur. The highly sensitive and extremely reliable microflow detector provides greater detectability, greater stability and a lower sensitivity to vibration than conventional analyzers utilizing solid state or condenser microphone detectors. Couple this optical bench to the electronics and compact case design of the CAI series and you have a truly customized, state -of-the-art analyzer at an unbelievably low price.

A. Low cost but reliable galvanic fuel cell.
B. High performance compact paramagnetic sensor.

Either option or both can be selected for the series. Both read directly in digital percent oxygen. Both have multiple ranges and multiple linear outputs. They may be configured as a stand-alone analyzer series 100 or teamed with an NDIR bench in the series 200 or 300 to deliver a multicomponent solution to your gas analysis requirements.

METHOD OF OPERATION

Non Dispersive Infrared (NDIR)

The CAI NDIR analyzer section is based on the infrared absorption characteristics of gases. Using a single infrared beam to measure gas concentrations, this analyzer produces highly stable and reliable results.

A single infrared light beam is modulated by a chopper system and passed through a sample cell of predetermined length containing the gas sample to be analyzed. As the beam passes through the cell, the sample gas absorbs some of its energy. The attenuated bean (transmittance) emerges from the cell and is introduced to the front chamber of a two-chamber infrared microflow detector. The detector is filled with the gas component of interest and, consequently, the beam experiences further energy absorption. This absorption process increases the pressure in both chambers. The differential pressure between the front and rear chambers of the detector causes a slight gas flow between the two chambers. This flow is detected by a mass-flow sensor and is converted into an AC signal. The AC signal is amplified and rectified into a DC voltage signal and ultimately supplied to the output terminal and digital panel meter. The electrical output signal is directly proportional to the concentration of the sample gas.

The CAI measuring cell consists of a dumbbell of diamagnetic material, which is temperature controlled electronically at 50°C.

The higher the oxygen concentration, the greater the dumbbell is deflected from its rest position. This deflection is detected by an optical system connected to an amplifier. Surrounding the dumbbell is a coil of wire. A current is passed through this coil to return the dumbbell to its original position. The current applied is linearly proportional to the percent oxygen concentration in the sample gas. This concentration is displayed on a digital panel meter. Oxygen- Galvanic Fuel Cell

The CAI oxygen analyzer utilizes a low cost fuel cell to determine the percent level of oxygen contained in the sample gas. The oxygen level is displayed on a digital panel meter.

Configure Your Own

• Select the Component Analyzers for your specific requirements CO, CO₂, CH₄, O, or SO₂
• Select the case required for the number of Component Analyzers (up to 3)

Model 100 (any 1 component analyzer), Model 200 (any 2 component analyzer),
Model 300 (any 3 component analyzer)
• Select the required ranges for each component Analyzers specified.