Technical Specifications:

• Input Signals: 4–20 mA DC, Pulse (contact closure), Frequency (0–10 kHz)
• Output Signals: 4–20 mA DC, Pulse output, Relay output (alarm)
• Power Supply: 24 VDC / 100–240 VAC (dual supply)
• Accuracy: ±0.1% of reading
• Display: 6-digit LED display (red, 14.2 mm digit height)
• Communication: RS-485 (Modbus RTU protocol)
• Pulse Input: Max 10 kHz, 5–24 VDC
• Relay Output: 250 VAC 3 A / 30 VDC 3 A (SPDT)
• Operating Temperature: -10°C to +55°C
• Protection Rating: IP65 (NEMA 4X front panel)
• Mounting: DIN rail / Wall mount / Pipe mount
• Dimensions: 96 mm × 96 mm × 110 mm (W × H × D)

Functional Features:

• Flow rate totalization (forward/reverse/net)
• Instantaneous flow rate display on 6-digit LED
• Analog output proportional to flow rate (4–20 mA)
• Pulse output for remote totalizer
• Relay alarm output (high/low flow alarm)
• Modbus RTU communication for DCS/SCADA integration
• Batch totalization with reset function
• Zero cut function (eliminates low-flow noise)

Material Composition:

• Housing: Die-cast aluminum alloy with powder-coat finish
• Front Panel: Polycarbonate with IP65 gasket seal
• Terminals: Phosphor bronze, tin-plated screw terminals

Structural Characteristics:

• Form Factor: Square 96×96 mm panel-mount housing
• Depth: 110 mm (behind panel)
• Weight: Approximately 700 g

Working Principle:
The FC311-S1 receives pulse, frequency, or 4–20 mA signals from a flow sensor (turbine, vortex, electromagnetic, etc.). The internal microprocessor calculates instantaneous flow rate and accumulated total using configurable K-factors and pipe dimensions. Results are output as 4–20 mA analog signal and pulse output, with alarm relay activation on setpoint violation.

Key Advantages:

• IP65 front panel — suitable for harsh field environments
• Multiple input types — compatible with virtually all flow sensors
• Built-in totalizer eliminates need for separate totalizer
• Modbus RTU enables seamless DCS integration
• Compact 96×96 mm size saves panel space

Applicable Industries:

• Oil & Gas (custody transfer, well monitoring)
• Chemical Processing
• Water & Wastewater
• Power Generation (cooling water, steam)
• Food & Beverage

Installation Requirements:

• Mount in location with ambient temperature -10°C to +55°C
• Use shielded cable for pulse input signals
• Provide 24 VDC or 100–240 VAC power supply
• For pipe mounting, use proper gasket and torque specifications

Usage Precautions:

• Do not exceed maximum input frequency of 10 kHz
• Verify K-factor and pipe size configuration matches actual sensor
• Ensure proper grounding of signal cables
• Do not disassemble in hazardous atmosphere