Detailed steps when using hydrogen as working gas in tube furnace
①Connect the hydrogen gas circuit, and check the leaks with soapy water at each joint to confirm that there is no gas leak.
②Confirm that each valve is closed.
③Turn the knob counterclockwise to open the hydrogen cylinder main valve, and turn the knob clockwise to slowly open the outlet pressure reducing valve to keep the outlet pressure at 0.1MPa.
④Turn on the power of the mechanical pump, open the outlet valve and the two valves on the gas path of the mechanical pump, and pump for 5 minutes.
⑤Close the two valves on the gas path of the mechanical pump, close the outlet valve, and turn off the mechanical pump.
⑥Open the upper gas path control valve counterclockwise and make the arrow point to the “open” position.
⑦Adjust the flowmeter knob counterclockwise to make the reading at 20ml/min.
⑧Turn the knob counterclockwise to open the intake valve until the barometer reads zero.
⑨Open the intake valve and open the red outlet valve on the hydrogen gas line.
⑩The heating of the atmosphere tube furnace can only be started after the hydrogen gas has been vented for ten minutes. Before heating, adjust the flow meter knob counterclockwise to make the bubbles in the Erlenmeyer flask appear at a rate of 2 bubbles per second.