Pantech Instruments manufactures Microprocessor based and fully configurable Auto Controllers Model 881 and A881. Pantech Instruments is the manufacturer of Process Control Instruments. The microprocessor based and fully configurable auto controllers are designed to control and display control parameters. The instrument serves the purpose of an A/M controller along with an indicator with retransmission output. As an A/M controller, this microprocessor based and fully configurable Auto Controllers accept 4-20 mA input from possible sources like DCS and gives at the output in the normal AUTO mode. During the possible breakdown, the control shifts from the Auto mode to the Manual mode, and the user can now control the output 4-20 mA from the control keys provided on the front panel.
Even in case of failure of A/M station, the Microprocessor based and fully configurable Auto Controllers continues its control in auto mode. The optional auto bias feature of the instrument allows even manual to auto transfer bumpless. The bias is set automatically in manual mode to allow this bumpless transfer and then it can be changed by the same push buttons in auto mode. External feedback signal o/p from the A/M station allows controller to track A/M output in manual mode. The rates of change of output Microprocessor based and fully configurable Auto Controllers and bias [in auto mode] are 1 percent and 10 percent per second. The instrument has a 4 digit display which displays the Output parameters as configured by the user. Microprocessor based and fully configurable Auto Controllers accepts another 4-20 mA input, displays as a 4 digit display as configured by the user, and gives optional 4-20 mA retransmission signal. The instrument provides 24 V DC transmitter power supply to power up mA transmitter in 2 wire or 4 wire connection system. .The Microprocessor based and fully configurable Auto Controllers incorporate low drift operation.
