| 摘要 |
PURPOSE: A nitrogen supply is provided to prevent the damage on an optical module by precisely controlling the pressure of the nitrogen supplied from a nitrogen tank and to conveniently control the pressure of the nitrogen. CONSTITUTION: A nitrogen supply comprises a nitrogen tank(21), a nitrogen charge bench(23) supplied with nitrogen from the nitrogen tank in a specific pressure via a control valve(22), a first and a second pressure control valves(24,26) installed in the nitrogen charge bench to precisely control the pressure of the nitrogen supplied from the nitrogen tank, an air shut-off valve(27) to flow in the external air, and an exhaust valve(28) to discharge the residual nitrogen of the nitrogen charge bench. The pressure of the nitrogen supplied from the nitrogen tank is controlled by the pressure control valves. The controlled pressure is indicated on an analog pressure gauge(34). Therefore, nitrogen is supplied in the precisely controlled pressure.
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