FL-CON3.1 Flow Controller Unit

Module Feature

FL-CON3.1 is a compact DIN rail process flow controller. It receives flow signal from field transmitter and outputs regulating signal to electric control valve. Built-in PID algorithm, adjustable proportional, integral and derivative parameters. It supports local display of flow value, setpoint and alarm status. It can communicate with PLC and SCADA via serial bus. Widely stocked as spare for water treatment, chemical and HVAC flow control cabinets.

Working principle

The module reads 4-20mA feedback signal representing actual flow rate. It compares measured value with setpoint, calculates PID output and sends regulating signal to actuator to adjust valve opening. It triggers high/low flow alarm when measurement exceeds preset threshold. Internal watchdog circuit monitors module running status to prevent out-of-control.

Onboard components

Signal sampling circuit, PID microprocessor, analog output drive circuit, display panel, status LED, communication circuit and plastic DIN rail housing.

LED indicators

Front LEDs indicate power, run, alarm and communication status.

Hardware self‑diagnosis

Module monitors signal input break, internal power and communication status. PID parameters and alarm thresholds can be modified on local panel.

Programming software

Vendor configuration software, used for parameter backup, remote tuning and fault log checking.

Electrical & Process Parameters

Model: FL-CON3.1 Brand: Generic Device type: Flow PID controller Power supply: 24V DC Signal: 4-20mA input / 4-20mA output Function: Closed-loop flow regulation and flow alarm monitoring

Mechanical & Structure

Mounting: DIN rail mounting Protection class: IP30 Housing: Plastic enclosure

Environmental

Operating temperature: -10℃ ~ +60℃ Storage temperature: -40℃ ~ +85℃ Ambient humidity: 5~95% non‑condensing

Certification: CE Status: Original process control spare

Installation

Cut off 24V DC supply before replacement. Mount module on DIN rail, wire flow transmitter input, valve actuator output and power supply, configure PID and alarm values, test closed-loop regulation and alarm function after commissioning.

Interface

4-20mA input terminals, 4-20mA output terminals, 24V DC power terminals, communication terminals.

Diagnostic

No input signal: Transmitter fault or wiring open circuit. Flow unstable: Improper PID parameter setting. Alarm always active: Setpoint value mismatched or sensor calibration drift.

Product Brief

FL-CON3.1 controller, DIN rail PID flow control spare for industrial liquid and gas flow closed-loop adjustment replacement.