INCA CHLORIDE SG-1124-4

Core Technical Specifications

• Form Factor: Standard 3U Eurocard 19-inch rack plug-in board
• Input Channels: 8 galvanically isolated analog sensor input channels (chloride, pH, conductivity)
• Input Signal Range: 0–100mV electrode weak signal, 4–20mA standard process signal
• Isolation Grade: 1500Vrms channel-to-channel isolation; 2500Vrms input-to-output isolation
• Analog Output: 4×4–20mA isolated control output channels for dosing valve actuators
• Relay Output: 6×SPDT mechanical relay contacts (5A 240VAC max switching capacity)
• Power Supply: 24VDC cabinet control power, 18–30VDC operating range
• Measurement Accuracy: ±0.1% full scale analog signal conversion
• Operating Temperature: -10°C ~ +60°C cabinet environment
• Humidity Resistance: 5%–90% RH non-condensing, anti-corrosion conformal coating
• Dimension: 240mm (L) × 150mm (H) × 35mm (D)

Function Features

1. Dedicated chloride ion concentration signal amplification and temperature compensation algorithm for water disinfection probes
2. Per-channel configurable high/low alarm threshold with relay contact output for fault alert
3. Built-in sensor loop break detection, automatic alarm when probe cable open-circuit
4. Configurable PID closed-loop dosing control without external PLC auxiliary logic
5. Galvanic isolation eliminates ground loop interference in multi-sensor distributed water treatment stations
6. Epoxy full board conformal coating to resist chlorine vapor and corrosive humid environment
7. Multi-channel signal multiplexing for centralized data transmission to SCADA monitoring system

Working Principle

Material Composition

• PCB Substrate: High anti-corrosion FR4 circuit board with full gray epoxy conformal coating
• Signal Amplifiers: Low-drift industrial instrumentation op-amps with low leakage current
• Isolation Components: High withstand voltage optocoupler isolation chips
• Relay Components: Silver alloy contact mechanical relays for long service life in frequent switching
• Edge Connector: Gold-plated Eurocard DIN 41612 rack connector for rack bus connection
• Passive Components: Anti-corrosion sealed film resistors and long-life tantalum capacitors

Structural Characteristics

1. Standard 3U Eurocard rack plug-in design, compatible with universal 19-inch industrial control racks
2. Front panel terminal strip with labeled channel input/output wiring terminals
3. Multi-indicator LED array per channel: power, signal active, high/low alarm status
4. Rear edge gold-plated bus connector for rack power and SCADA data communication
5. Integrated metal mounting bracket for rack fixation, anti-vibration rubber shock pad

Installation Requirements

1. Install inside air-conditioned control cabinet, avoid direct exposure to chlorine gas and water vapor
2. Sensor wiring must use shielded low-noise signal cable, shield single-point grounded at rack ground bar
3. Maintain ≥20mm spacing between adjacent SG-1124-4 boards for heat dissipation
4. Relay output load wiring separated from low-level sensor signal wiring to avoid switching noise
5. Cabinet internal humidity controlled below 85% RH to prevent conformal coating degradation

Application Scenarios

• Municipal drinking water disinfection plants: Chlorine residual concentration monitoring & dosing control
• Industrial circulating cooling water systems: Chloride corrosion inhibitor automatic dosing
• Swimming pool water treatment: pH and chlorine concentration closed-loop regulation
• Chemical wastewater treatment stations: Halide ion waste water discharge monitoring
• Food & beverage factory process water disinfection control systems

Operation Precautions

1. Module is discontinued original equipment; replacement must use same SG-1124-4 model without cross-model substitution
2. Do not remove epoxy conformal coating; exposed circuit will corrode rapidly in chlorine vapor environment
3. Calibrate sensor signal channels every 3 months using standard chloride buffer solution
4. Avoid switching inductive loads directly via relay contacts without freewheeling diode protection
5. Replace mechanical relays every 5 years if daily frequent alarm switching occurs
6. Do not install in outdoor unenclosed cabinets without rain and corrosive gas shielding