IO-PT4K – Unitronics 4 PT1000/NI1000 inputs module,r

Why Choose the Unitronics IO-PT4K RTD Temperature Input Expansion Module?

The Unitronics IO-PT4K is a dedicated RTD temperature input expansion module designed to provide accurate temperature measurement capabilities for compatible Unitronics Vision and OPLC control systems. Featuring 4 RTD temperature inputs, the module enables reliable monitoring of industrial processes, HVAC systems, environmental controls and manufacturing equipment requiring precise temperature measurement. The IO-PT4K is specifically designed to support PT1000 and NI1000 RTD sensors for applications requiring higher resistance temperature sensing.

Designed specifically for resistance temperature detector (RTD) applications, the IO-PT4K offers flexible sensor connectivity with support for 2-wire, 3-wire and 4-wire RTD configurations. This versatility allows engineers to integrate the module into a wide range of industrial installations while maintaining accurate and stable temperature measurements.

With DIN rail mounting, integrated diagnostics and support for PT1000 and NI1000 sensor technologies, the IO-PT4K provides a dependable solution for expanding temperature monitoring functionality within Unitronics automation systems.

Key Advantages

• Provides 4 dedicated RTD temperature inputs.
• Supports PT1000 and NI1000 temperature sensors.
• Compatible with 2-wire, 3-wire and 4-wire RTD connections.
• High measurement accuracy for industrial temperature monitoring.
• Simple integration with Unitronics Vision and OPLC systems.
• Compact DIN rail-mounted design saves control panel space.
• Suitable for industrial process control and environmental monitoring.

Key Features

• Unitronics IO-PT4K temperature input expansion module.
• 4 RTD analogue temperature inputs.
• Supports PT1000 and NI1000 sensors.
• 2-wire, 3-wire and 4-wire RTD compatibility.
• 12-bit resolution.
• 40ms conversion time.
• Successive approximation conversion technology.
• Channel fault and out-of-range diagnostics.
• Communication and channel status LEDs.
• DIN rail or panel mounting options.

Technical Specifications

• Manufacturer: Unitronics
• Model: IO-PT4K
• Product type: RTD temperature input expansion module
• Number of inputs: 4 RTD inputs
• Supported sensor types: PT1000, NI1000
• Temperature coefficient: PT 385/392, NI 618
• RTD wiring: 2-wire, 3-wire and 4-wire
• Temperature units: °C and °F
• Resolution: 12-bit (4096 units)
• Measurement resolution: ±0.1°C
• Conversion method: Successive approximation
• Conversion time: 40ms
• Input impedance: 10MΩ minimum
• Maximum current consumption: 35mA from adapter 5V DC supply
• Typical power consumption: 0.09W @ 5V DC
• Protection rating: IP20 / NEMA 1
• Operating temperature: 0°C to +50°C
• Storage temperature: -20°C to +60°C
• Relative humidity: 10% to 95% non-condensing
• Dimensions (W × H × D): 80 × 93 × 60 mm
• Weight: Approximately 140 g
• Mounting type: 35mm DIN rail or panel mounting

Accurate Temperature Monitoring for Industrial Automation

The IO-PT4K enables automation engineers to integrate precise temperature measurement into PLC-controlled systems using PT1000 and NI1000 RTD sensors. By supporting multiple RTD wiring methods, the module simplifies temperature monitoring across manufacturing, process control and building automation applications.

Its dedicated RTD inputs eliminate the need for external signal conditioning equipment, while built-in diagnostics help identify sensor faults, wiring failures and out-of-range conditions to improve system reliability and maintenance efficiency.

Typical Applications

• Industrial process temperature monitoring.
• HVAC and building management systems.
• Food and beverage processing.
• Chemical and pharmaceutical production.
• Environmental monitoring systems.
• Manufacturing and production equipment.
• OEM machinery and automation systems.
• Heating and cooling control applications.

Trusted by Automation Engineers Worldwide

Unitronics temperature measurement modules are widely used in industrial automation systems where accurate process monitoring, reliable sensor integration and seamless PLC communication are essential for efficient operation.