2. Measurement Principle
2.1. CO
– The analyser comprises an infrared source assembly mounted on one side of the measurement chamber. On the opposite side of the measurement chamber is the receiver.
– The source consists of a small black-body emitter and gas wheel assembly. The wheel is rotated by a stepper motor at a constant speed of 1Hz. A unique gas cell arrangement enables the transmitted beam from the source to be periodically interrupted by a gas sample of pure CO, thus enabling active (D1) and reference (D2) measuring channels to be created […].

Energytech_203_technical_manual.pdf

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