Technical Specifications:

• Number of Channels: 2
• Sensor Types Supported: PT100 (DIN IEC 60751), PT1000 (DIN IEC 60751), Ni100 (DIN IEC 60751)
• Wiring Configuration: 2-wire, 3-wire, 4-wire (software selectable per channel)
• Resolution: 12-bit (4096 steps)
• Temperature Range (PT100, 4-wire): -200 °C to +850 °C
• Temperature Range (PT100, 2-wire): -50 °C to +500 °C (with reduced accuracy)
• Accuracy: ±0.1 °C (at 0 °C, 4-wire PT100)
• Measurement Current: 1 mA (typical)
• Supply Voltage: 24 V DC (nominal), range 20.4 V to 28.8 V
• Power Consumption: ≤ 2.0 W
• Isolation: Channel-to-channel galvanic isolation, 500 V DC
• Isolation to Bus: 500 V DC
• Operating Temperature: 0 °C to +55 °C
• Storage Temperature: -25 °C to +70 °C
• Relative Humidity: 5% to 95% (non-condensing)
• Dimensions (W x H x D): 22.5 mm x 120 mm x 79.5 mm
• Weight: Approximately 150 g

Functional Features:

• Automatic sensor type detection (PT100/PT1000/Ni100)
• Software-selectable wiring mode (2/3/4-wire) per channel
• Lead wire resistance compensation (3-wire and 4-wire modes)
• Linearization table for Pt100 per IEC 60751
• Diagnostic LED per channel
• Open-circuit detection and short-circuit detection
• Cold junction compensation not required (direct RTD connection)

Structural Characteristics:

• DIN rail mounting (TS 35)
• Plug-in terminal blocks with spring clamps
• ABS plastic housing
• Status LEDs on front face
• X20 bus connector on bottom

Working Principle:
The module generates a precision constant current (1 mA) through the RTD sensor. The voltage drop across the RTD is measured by a 12-bit ADC. In 4-wire mode, separate sense leads eliminate lead resistance error. In 3-wire mode, the module compensates for lead resistance mathematically. The measured resistance is converted to temperature using the Callendar-Van Dusen equation (IEC 60751). Digital results are sent to the controller via X20 bus.

Advantages & Highlights:

• Direct RTD connection eliminates need for external transmitters
• 4-wire mode provides highest accuracy with lead resistance compensation
• Supports PT100, PT1000, and Ni100 — no hardware changes required
• Open-circuit and short-circuit diagnostics built in
• 12-bit resolution ensures fine temperature granularity

Applicable Industries:

• Plastics and rubber processing
• Metalworking and heat treatment
• Food processing (ovens, pasteurizers)
• Pharmaceutical batch processing
• Power generation (turbine monitoring)
• HVAC and building automation

Installation Requirements:

• Mount on DIN rail (TS 35 x 7.5 or TS 35 x 15)
• Use dedicated shielded twisted-pair cables for RTD connections
• Keep sensor cables away from high-power cables (minimum 100 mm separation)
• Connect to X20 base module or X20 system bus
• For 2-wire mode, keep lead wire length under 5 meters for acceptable accuracy

Usage Precautions:

• Always configure correct wiring mode (2/3/4-wire) in software to match physical wiring
• Do not exceed maximum sensor current of 1 mA (module-limited, inherent protection)
• Verify sensor type selection matches installed RTD
• For 2-wire configuration, account for lead resistance in accuracy budget