1, check the ultimate vacuum: the mercury vapor vacuum gauge as the standard, after full pre-pumping calibration, the pump temperature reached the same, the pump port and meter connected directly, running for 30 minutes, will reach the ultimate vacuum. 2, such as latitude relative to high, or pumping gas containing more condensable steam, connected to be pumped container, the gas valve should be open to clean up, operation 20 to 40 minutes after the gas valve shut down, So as not to affect the degree of vacuum. After the pump is stopped, the open-air valve can run without load for 30 minutes, so that the pump oil can recover its original function.
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