YK10-0015-DI-002-03
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APPENDIX 1.2 Automatic Operation
The mechanical booster pump PMB-040C, PMB-060C has a certain operating pressure range.
When starting it, therefore, it is necessary to monitor the vacuum gauge.
In automatic operation, it is necessary to install a vacuum switch for pressure detection. When the
pressure on the intake side becomes lower than the maximum intake pressure, the vacuum switch
is actuated to start the mechanical booster pump. In the method (2), it can be interlocked with the
vacuum switch by making the roughing valve a compressed air driven type.
The vacuum switch is available in two types: mechanical and electrical. It is installed on the
vacuum chamber or near the intake port of the mechanical booster pump.
CAUTION
●When using the vacuum pump other than the standard backing
pump as the backing pump, since the maximum intake pressure
becomes different from the described value, be careful for it.
CAUTION
●When the difference is not available in between the pressure in the
vacuum vessel and the pressure of inlet port of the mechanical
booster pump, it is okayed to mount the vacuum switch on the
vacuum vessel.
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