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diameter. If the vacuum pump may not be replaced, add a tank (capacity
of the tank depends on the operating conditions) on VAC side.
(7)Note that pressure response time after valve (solenoid valve) opening/
closing is affected by internal volume of the setting side (including piping
volume). In addition, capacity of vacuum pump affects the response time.
(8)As the vacuum regulator intakes atmospheric pressure all the time, the vacuum
pressure cannot be maintained if the vacuum pump or valve is stopped.
If vacuum pressure needs to be retained, it is necessary to continuously run the
vacuum pump.
(9)The set pressure may vary depending on the elapsed time and change in ambient
temperature after pressure setting. If the setting value varies, adjust with the
handle.
(10)If the directional control valve (solenoid valve, mechanical valve etc.) is mounted
and switched ON-OFF repeatedly for a long time, the set pressure may vary. If the
setting value varies, adjust with the handle.
(11) If there is a possibility that the vacuum regulator takes in the dust and water
droplets in the ambient environment through the SET port of the vacuum regulator,
install a vacuum filter or a vacuum drain separator to avoid the entry of these.
(12)There may be pulsation or noise depending on the pressure conditions, piping
conditions and ambient environment.
In this case, it is possible to improve the
problem by changing the pressure conditions and piping conditions. If the problem
is not improved, contact your SMC sales representative.
(13) If pressure gauge is used in the direction as Figure 1, it may cause
displacement from zero point. Therefore, be sure to use pressure gauge in the
Direction as Figure 2
Zero point
Zero point
Up
Down