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Refer to Figure 4-1. 1) Gently turn the valve counterclockwise. A stream of bubbles should appear at the base of the humidifier column, and the float of the flowmeter should rise in its tube. 2) Adjust the valve so that the flowmeter float is centered in the flow rate reference indicator. CAUTION: Open the throttle valve carefully. Excessive flow rate may cause water in the humidifier column to be carried into the detector cell. This can cause erratic readings and may require disassembly, cleani