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 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 stopping the pump, open the air valve to run for 30 minutes without load, so that the pump oil can restore the original function.
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