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Siemens positioners are a relatively common product in everyday life. However, for those who are not familiar with this product, there are many questions regarding it, and technical experts are needed to provide comprehensive answers. Below, the editor has summarized some questions regarding this product, in the hope that it will be helpful to you. Does manual initialization of the positioner mean that it is possible to manually set the end and starting points of the valve stem travel? Manual initialization: Initialization can be carried out without necessarily driving the actuator to the end position. The start and end positions of the rod can be set manually. What is the purpose of setting an air switch for Siemens positioners? The purpose of installing an air switch inside the locator is to enable opening of the gauge housing; the air injection switch on the pneumatic terminal block and on the valve branch pipe can be used for this purpose. When the switch is set to “OUT”, the instrument air is discharged directly outside the instrument ； When the switch is set to “IN”, a small amount of clean and dry instrument air is introduced into the inside of the gauge case. What does the soft end in a locator refer to? Manual initialization: The stroke or angle of the actuator can be adjusted manually; the remaining parameters are determined automatically, just as in automatic initialization. This function is required when the software is stopped. What is the purpose of designing a current limiter in Siemens positioners? Throttler: The rapid actuator requires an increased adjustment time, and the air flow can be reduced using throttlers Y2 and Y1. When setting the flow restrictors, we recommend turning them off first and then gradually turning them on again; in the case of double-acting valves, the settings for both restrictors should be the same. If a reduction is needed, we can rotate the flow restrictor clockwise to decrease the air flow until it is closed.