Description: Microprocessor-Based Controller Unit is equipped with three set points and three separate relays. The programming, calibration, and operation of the instrument are done by four simple keys and two independent displays for set point and process. Variable set point display is kept to differentiate from process variable display. Status of control/alarm/display relays and presently displayed set points are shown by 3 mm red LEDs. The operation of the instrument is menu driven with user understandable prompts. The provision for external data lock out keys is kept for protecting programmed data. Three setpoints with individual hystersis are provided with separate relays. The setpoints can be programmed as control or alarm type, relay on below or above setpoint and as deviation from main set point. This entire configuration can be done on line without opening the unit. The controller unit can be operated on 240V AC or 110V AC with 4-20 mA output facility calibration zero and span adjusted by digital calibration through front panel keys, and no trimpots. The self-calibrating equipment connected to the CMM and DGFAS & LI flame proof and weatherproof gas detectors. The unit can be calibrated in installed condition itself by front panel keys at any given point. The front of the controller unit is of sealed membrane type that enables to withstand dusty environment.
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