Abstract
An inexpensive CO 2 injection system is described. The system, used in conjunction with a CO 2 meter, can automatically inject known amounts of CO 2 into a plant enclosure to maintain the CO 2 concentration and measure plant photosynthetic rate. When the CO 2 meter senses that the CO 2 concentration in the enclosure has fallen below the desired value, a bellows pump withdraws CO 2 from a supply line through a demand valve and injects the CO 2 into the enclosure. Once a pump stroke has been initiated, the pump always completes the full stroke. Each pump stroke is counted, recorded on an impulse counter and converted to a standing analogue voltage for data logging. Pump operation is inhibited while the logger is interrogating the circuit and the analogue signal is reset to zero after each interrogation.
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