Introduction

The revised and updated version of Model 881 of Pantech Instruments is A881.

Pantech’s Model A881 are Microprocessor based Auto Manual Controllers, and are designed to control and display control parameters. The instrument serves purpose of an A/M Controller along with an indicator with retransmission output. As an A/M controller, the instrument accepts 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. This transfer is bumpless. Even in case of failure of A/M station, the controller continuos 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 (in manual mode) and bias (in auto mode) are 1% and 10% per sec.. The instrument has a 4 digit display which displays the Output parameters as configured by the user.

The instrument also 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 modules incorporate low drift operational amplifiers and industrial grade components. Burn out of each module ensures a long trouble free operation

Please confirm the availability of the model by cross checking the above section.