Pneumatic control Industrial Valves will be stipulated in the basic error input signal smooth input actuators in the direction shown by the increase/decrease air chamber ( Or locator) , measuring each point of the tour value, calculate the actual 'signal - Trip 'relationship with the theory of relationship between each point error and the maximum value is the basic error. Test points should include at least the signal range 0%, 25%, 50%, 75%, 100%, the five points. Measuring instrument calibrated Industrial Valves are fundamental error limit should be less than a quarter of the basic error limits. Return difference method with ( 1) , on the same input signal is measured by the positive and negative trip one of the biggest difference is the difference back. Always point deviation method with ( 1) And the lower limit of the signal, Starting point) Deviation, is the starting point of basic error signal of the ceiling, At the end) The basic error is the end point deviation.
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