Technical Specifications:

• Input Channels: 8 channels (configurable per channel)
• Input Types Supported: Pt100/Pt1000 RTD (2/3/4-wire), Type K/J/T/N Thermocouple, 0–10 V, 0–5 V, 4–20 mA, 0–20 mA
• Accuracy (RTD): ± 0.1°C (Pt100, 0°C to 100°C)
• Accuracy (TC): ± 1.5°C (Type K, 0°C to 500°C)
• Resolution: 16-bit ADC
• Output: 4–20 mA (isolated) or 0–10 V (isolated), selectable per channel
• Isolation Voltage: 1500 V DC (input-to-output, channel-to-channel)
• Cold Junction Compensation: Built-in, ± 0.5°C accuracy
• Supply Voltage: 24 V DC ± 15%
• Power Consumption: Maximum 3 W
• Operating Temperature: -20°C to +60°C
• Protection Rating: IP20
• Dimensions: 120 mm x 90 mm x 60 mm
• Weight: 280 g

Material Composition:

• Housing: Flame-retardant polycarbonate, dark grey (RAL 7021), UL94 V-0
• ADC: Analog Devices AD7192 (24-bit Sigma-Delta, low noise)
• RTD Excitation: Precision current source, 1 mA, 0.1% accuracy
• Isolation: Analog Devices ADuM1401 (digital), Si864x (analog), 5 kV
• Terminals: Spring-clamp, 0.2–4 mm²

Structural Features:

• DIN rail mountable (35 mm)
• 8 LED indicators (one per channel, green = OK, red = fault)
• DIP switches for input type selection per channel
• LCD display (optional version) for local value readout
• Backplane bus connector for controller communication

Working Principle:
Each channel uses a precision current source (1 mA) to excite RTD sensors. The voltage drop is measured by a 24-bit Sigma-Delta ADC (AD7192) and converted to temperature using the Callendar-Van Dusen equation stored in firmware. For thermocouples, cold junction compensation is performed by an on-board temperature sensor (TMP117 or equivalent) and the Seebeck coefficient lookup table is applied. All results are isolated via digital isolators (Si864x, 5 kV) and transmitted over the backplane bus or converted to 4–20 mA / 0–10 V via an isolated DAC.

Key Advantages:

• 8 universal input channels in one module (RTD, TC, mA, V)
• ± 0.1°C accuracy on RTD for precision temperature measurement
• Built-in cold junction compensation eliminates need for external CJC
• Fully isolated channels prevent ground loop errors

Applicable Industries:
Pharmaceutical, food & beverage, chemical processing, HVAC, power generation, laboratory automation.

Installation Requirements:

• Mount on 35 mm DIN rail
• For 3-wire RTD, connect sense wires to designated terminals
• For 4–20 mA inputs, loop power must be supplied externally (24 V DC)
• Set DIP switches for correct input type before connecting sensors

Usage Precautions:

• Do not exceed 30 V DC on voltage input channels
• For thermocouple inputs, use correct type (K, J, T, N) as configured
• RTD excitation current is 1 mA — do not connect external current sources
• Calibrate annually using certified temperature simulator