> Introduction :: Pantech's Control Valve Driving Stations, series 882, are designed to control output going to servo valve, with or without the process controller. Model 882P is a panel mounted Control Valve Driving Station, which accepts 4 – 20mA signals from controller and a feedback signal from control valve. The voltages for feedback signal are derived from the instrument itself. The instrument generates UP or DOWN pulses to operate motorised control valve based on the difference between controller output and feedback from control valve. The specially designed circuit drives the instrument in Manual mode, in case of input or feedback failure and locks the valve in its last position. Variable deadband of 0.5% to 5.0% prevents the valve from hunting. Also available is a special feature of delaying the another movement of valve by preset time once it is settled. The instrument has an overriding facility through the valve can be driven up or down manually. The instrument displays valve opening in percentage through 3 ½ digit red LED display. The modules incorporate low drift operational amplifiers and industrial grade components. Burn in of each module ensures a long trouble free operation. > Specifications ::
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