Wallace W D, Clark J S, Cutler C A
Respir Care. 1981 Aug;26(8):757-61.
We describe a new instrument that performs on-site mixing of oxygen (O2), carbon dioxide (CO2), and nitrogen (N2) to create compositions that can replace gases from standard premixed cylinders. This instrument yields accurate and predictable gas mixtures that can be used for two-point gas calibration of blood gas/pH analyzers or for liquid tonometry of either an aqueous buffer or blood used as quality-control material on blood-gas electrodes. The desired mixture of O2, CO2, and N2 is produced by microprocessor control of the sequential open-times on three solenoid valves that meter these pure gases through a common small-bore orifice. Any combination of O2 and CO2 can be chosen by dialing the front panel thumbwheels and pressing a button. Gas chromatographic evaluation of this gas-mixing instrument demonstrates its accuracy and precision to be better than +/- 0.1% absolute full scale for O2, CO2, and N2, making this instrument calibration and tonometry.
我们描述了一种新型仪器，该仪器可现场混合氧气（O₂）、二氧化碳（CO₂）和氮气（N₂），以生成能够替代标准预混气瓶中气体的成分。该仪器能产生准确且可预测的气体混合物，可用于血气/pH分析仪的两点气体校准，或用于对用作血气电极质量控制材料的水性缓冲液或血液进行液体测压法。所需的O₂、CO₂和N₂混合物是通过微处理器控制三个电磁阀的顺序开启时间来产生的，这三个电磁阀通过一个共同的小孔径孔口计量这些纯气体。通过旋转前面板的指轮并按下按钮，可以选择O₂和CO₂的任何组合。对该气体混合仪器进行气相色谱评估表明，其对O₂、CO₂和N₂的准确度和精密度优于绝对满量程的±0.1%，这使得该仪器可用于校准和测压法。
