SIEMENS MOORE 351A21N1C Single Loop Digital Controller

Technical SpecificationsModel:351A21N1C Brand:SIEMENS MOORE Product Type:Single Loop Digital PID Process Controller Power Supply:120V AC,47-63Hz Input Signal:4-20mA, thermocouple, RTD Output Signal:4-20mA analog output, relay alarm contact Mounting:Panel mount Operating temperature:-20℃ ~ +60℃ Storage temperature:-40℃ ~ +85℃ Relative humidity:5%~95%, non-condensing Weight:3.4kg Dimension:76mm152mm432mm

System compatibility351A21N1C belongs to SIEMENS MOORE 351 series standalone single-loop process controller. It can run independently for closed-loop regulation, and support communication with upper DCS or HMI systems.

FunctionThis single-loop digital PID controller performs closed-loop control of temperature, pressure, flow and liquid level. It supports auto-tuning PID, cascade control and feedforward control. Operators can set parameters, view real-time process values and alarm messages via front keypad and digital display.

InstallationCut off power before installation. Embed the controller into cabinet panel and lock mounting clips. Wire analog input, control output, alarm relay and power terminals according to wiring drawing. Complete PID tuning after power on.

InterfaceRear 40 screw terminals, analog input terminals, analog output terminals, relay alarm terminals, front panel digital display and operation keypad.

FeatureSingle loop PID control, auto-tuning algorithm, built-in alarm function, local human-machine operation, robust metal housing, strong anti-interference for continuous plant operation. Obsolete legacy spare part, used for industrial single-loop controller maintenance and replacement.

DiagnosticNo display: check AC power supply and terminal wiring. Control deviation: recalibrate PID parameters and verify sensor input signal. Alarm trigger: check process variable and wiring fault.

Product BriefSIEMENS MOORE 351A21N1C is 351 series single-loop digital PID process controller, widely used in petrochemical, boiler and water treatment industries for single process loop closed-loop regulation.

DisclaimerAll parameters are for reference only and shall not be used as the basis for quotation. Goods are scarce, overseas delivery lead time is 3-7 working days. It is only used for equipment maintenance and renovation.