Easy Smart SVI® II AP-1 Digital Positioner
To
complement the existing line of SVI II AP product range, the Easy Smart SVI II AP-1
digital positioner has been designed to offer a compact, high performance digital
instrument that is economical and easy to commission.
The
most notable areas of enhancement are in the housing that is ATEX tight proof and
intrinsically safe only and in the pneumatic relay.
The SVI II AP-1 is a smart electro-pneumatic positioner that receives a 4 - 20 mA electrical position setpoint signal from the controller and compares the position setpoint input signal to the valve position feedback sensor. The difference between the position setpoint and position feedback is analyzed by the position control algorithm that sets a servo signal for the I/P converter. The output pressure of the I/P is amplified by a pneumatic relay that drives the actuator. Once the error between the setpoint and the valve position feedback is within range, no other correction is applied to the servo signal in order to maintain valve position.The local pushbutton display (if equipped) provides configuration, calibration mode in all operating environments. The limit switch⁄transmitter options board provides contact outputs that are software configurable, and an analog (4 to 20 mA) position feedback. |
