EL3208 8-Channel Analog Input | Pt100 Temperature Terminal

EL3208 | 8-Channel RTD Input Terminal

Brand: Beckhoff | Type: EL3208 | Series: EtherCAT Terminal | Function: 8-channel analog input for Pt100 RTD

The EL3208 is a high-density analog input terminal for direct connection of eight resistance sensors. It converts resistance to temperature using Pt100, Pt1000, Ni120, or KTY characteristics. The terminal outputs values in ohms or °C with 16-bit resolution. Status LEDs and process data bits indicate measurement status.

Key Features

• 8 inputs in 12 mm housing
• 2-wire connection technology
• Configurable conversion time (3…1600 ms)
• Integrated digital filter and limit monitoring
• Electrical isolation 500 V (E-bus/signal)

Technical Specifications

• Inputs: 8, single-ended
• Sensor types: Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Ni1000, KTY, resistance (10 Ω…¼ kΩ)
• Measuring range: -200…+850 °C (Pt), -60…+250 °C (Ni)
• Resolution: 0.1 °C per digit
• Measuring error: < ±0.5 °C (Pt sensors)
• Input filter limit freq.: typ. 1 kHz
• Measuring current: < 0.5 mA (load-dependent)
• Conversion time: approx. 170 ms (default), configurable 3…1600 ms
• Power supply: via E-bus, typ. 140 mA
• Isolation: 500 V (E-bus/signal)
• Operating temp.: -25…+60 °C
• Storage temp.: -40…+85 °C
• Humidity: 95%, no condensation
• Vibration/shock: EN 60068-2-6 / EN 60068-2-27
• EMC: EN 61000-6-2 / EN 61000-6-4
• Protection rating: IP20
• Weight: approx. 60 g

Installation & Wiring

• Mounting: 35 mm DIN rail (EN 60715)
• Connection: Spring actuation by screwdriver
• Wire sizes: solid 0.08…1.5 mm², stranded 0.25…1.5 mm², ferrule 0.14…0.75 mm²
• Stripping length: 8…9 mm
• Power contact current: max. 10 A
• Side-by-side mounting with double slot & key

Debugging & Maintenance

• LED status indicators for each channel
• Status bits in EtherCAT process image
• Digital filter reduces noise
• Limit value monitoring for alarms
• Configuration via TwinCAT software

Compatibility

• EtherCAT couplers and controllers
• TwinCAT 2 / 3 automation suite
• Works with all Beckhoff I/O systems
• Supports 2-wire RTD sensors

Certifications

• CE
• UL
• EN 60068-2-6 / -27 (vibration/shock)
• EN 61000-6-2 / -4 (EMC)

Package Contents

• EL3208 terminal (1 unit)
• Documentation leaflet
• No accessories included

Warranty & Shipping

• Warranty: 12 months
• Shipping: 12-24 hours dispatch
• Carriers: FedEx, UPS, DHL

Expert Review

The EL3208 offers reliable 8-channel RTD input in a compact 12 mm housing. Its configurable conversion time and digital filter make it suitable for noisy industrial environments. The 0.1 °C resolution meets most temperature monitoring needs. For high-channel-count applications, this terminal saves space and simplifies wiring.

Manager’s Insight

For plant managers, the EL3208 reduces cabinet space by 50% compared to standard terminals. The integrated diagnostics and limit monitoring minimize unplanned downtime. With 500 V isolation, it protects the bus system from field faults. A cost-effective choice for multi-point temperature sensing.

Applicable Devices & Scenarios

• Devices: PLC, industrial PCs, EtherCAT masters
• Scenarios: HVAC, machine building, process automation, test stands
• Sensors: Pt100, Pt1000, Ni120, KTY, potentiometers

FAQ

• Can I use 3-wire or 4-wire sensors?
  No. The EL3208 supports only 2-wire connection. For 3/4-wire, use EL32xx series.
• What is the default conversion time?
  Approx. 170 ms. You can adjust it from 3 ms to 1600 ms via TwinCAT.
• Does it support Pt1000 sensors?
  Yes. Pt1000 is fully supported along with Pt100, Pt200, Pt500.
• How do I monitor limit values?
  Use the integrated limit monitoring feature. Set thresholds in TwinCAT.
• Is the terminal hot-swappable?
  No. Always power off the system before inserting or removing.
• What is the measuring current?
  Less than 0.5 mA, load-dependent. This minimizes self-heating.

Selection Guide

• For Pt100 applications with up to 8 sensors, choose EL3208.
• Need faster conversion? Configure conversion time down to 3 ms.
• For high-accuracy requirements, the EL3208 delivers ±0.5 °C.
• Use with Ni120 or KTY for special sensor types.
• For 3-wire RTDs, consider EL32xx series with compensation.

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