OKOS AL8XGTE-3

Technical Specifications Channels: 8 fully isolated analog input channels Input Types (per channel, software configurable):

• RTD: Pt100, Pt200, Pt500, Pt1000, Cu10, Ni100, Ni120 (2-, 3-, 4-wire)
• Thermocouple: B, E, J, K, L, N, R, S, T, U
• mV: ±15 mV, ±50 mV, ±100 mV
• Current: 0 mA to 20 mA, 4 mA to 20 mA (250 Ω internal shunt)
• Voltage: ±10 V, 0 V to 5 V, 0 V to 10 V, ±5 V Resolution: 16-bit sigma-delta ADC Accuracy: ±0.1 % of full scale (typical), ±0.2 % (max) Update Rate: 10 Hz per channel (selectable 2.5 Hz / 5 Hz / 10 Hz) Isolation: Channel-to-channel and channel-to-bus, 500 V AC Common-Mode Rejection: ≥ 120 dB at 50/60 Hz Power Supply: 24 V DC ± 20 %, from backplane Power Consumption: ≤ 3 W Operating Temperature: -20 °C to +60 °C Humidity: 5 % to 95 % RH, non-condensing Protection: Overvoltage and reverse-polarity protection per channel EMC: IEC 61000-6-2, IEC 61000-6-4

Functional Features Universal input accepts all standard process signals without hardware jumpers Per-channel cold-junction compensation for thermocouples Built-in sensor break and short-circuit detection with configurable alarm Digital filtering and linearization per channel Hot-swap capability with automatic configuration restore Conformal-coated PCB for harsh industrial environments

Application Scenarios Temperature monitoring in reactors, furnaces, and heat exchangers Pressure, flow, and level signal acquisition from 4-20 mA transmitters Multi-sensor data logging in test benches and environmental chambers Process skids and OEM machinery requiring flexible analog I/O

Material Composition Housing: Flame-retardant ABS/PC blend, UL 94 V-0 PCB: FR-4 with 70 µm copper, conformal acrylic coating Connectors: Pluggable screw-type terminal blocks, nickel-plated brass ADC: 24-bit sigma-delta converter with internal PGA Isolation: Digital isolators and isolated DC-DC converters Terminals: Steel screw with copper current bar

Structural Features Standard DIN-rail mount module, 23 mm width per channel group Front-panel LED indicators for power, communication, and channel status Removable terminal block with finger-safe cover Keyed backplane connector prevents mis-insertion Label strip for channel identification

Working Principle Each input channel conditions the field signal through a programmable gain amplifier and anti-alias filter, then digitizes it with a sigma-delta ADC. A microcontroller applies linearization, cold-junction compensation, and scaling before transmitting engineering units to the controller via the isolated backplane interface.

Installation Requirements Mount on standard 35 mm DIN rail in a ventilated enclosure Use shielded twisted-pair cable for all analog inputs; ground shield at controller end Route thermocouple extension wire of matching thermocouple type Keep analog wiring at least 200 mm from AC power and VFD cables Verify 24 V DC supply is stable and free of excessive ripple

Usage Precautions Do not apply voltage exceeding ±30 V to any input channel Configure input type per channel before field wiring to avoid damage Use 3-wire or 4-wire RTD connections for highest accuracy; 2-wire introduces lead error Calibrate module annually or after exposure to extreme conditions Do not hot-swap while field signals are live; isolate inputs first