EL3208 Beckhoff | Temperature Measurement Terminal 16-bit Resolution
Introduction:
Beckhoff EL3208 EtherCAT Terminal. 8-channel analog input for RTD (Pt100) sensors. 16-bit resolution with integrated digital filter.
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Product Overview
The Beckhoff EL3208 is an analog input EtherCAT terminal for temperature measurement. It facilitates direct connection of eight resistance sensors in a compact 12 mm width. This terminal converts measured resistance values into temperature readings. The Beckhoff EL3208 supports various sensor characteristics including Pt100, Pt1000, Ni120, and KTY types. Users trust this terminal for high-density RTD temperature monitoring applications.
Technical Specifications
The EL3208 delivers precise temperature measurement with integrated filtering. Below are the complete technical details.
General Specifications
Product Type: EtherCAT Terminal.
Part Number: EL3208 for precise identification.
Product Status: Regular delivery.
Number of Inputs: 8 channels.
Technology: 2-wire sensor connection.
Signal Type: Single-ended.
Weight: Approx. 60 g for lightweight installation.
Housing Form: HD (High Density) housing with signal LEDs.
Sensor Compatibility
Pt Sensors: Pt100, Pt200, Pt500, Pt1000.
Ni Sensors: Ni100, Ni120, Ni1000.
Resistance Measurement: 10 Ω to 1/4 kΩ (e.g., potentiometer).
KTY Sensors: Various types (see documentation).
Connection Method: 2-wire.
Measuring Current: Less than 0.5 mA (load-dependent).
Temperature and Measurement Ranges
Pt Sensor Temperature Range: -200 to +850°C.
Ni Sensor Temperature Range: -60 to +250°C.
Resolution: 0.1°C per digit.
Measuring Error (Pt Sensors): Less than ±0.5°C.
Conversion and Filter Specifications
Conversion Time (Default): Approx. 170 ms.
Conversion Time (Configurable): 3 to 1600 ms.
Input Filter Limit Frequency: Typ. 1 kHz.
Integrated Digital Filter: Yes for noise rejection.
Distributed Clocks: Not supported.
Output Options
Resistance Output: Direct ohms reading.
Temperature Output: Transformed from resistance.
Process Image: Status bits in EtherCAT process image.
LED Indication: Measurement capability via light emitting diodes.
Power Specifications
Power Supply: Via the E-bus.
Current Consumption (E-bus): Typ. 140 mA.
Current Consumption (Power Contacts): Not used.
Electrical Isolation: 500 V (E-bus/signal voltage).
Special Features
Integrated Digital Filter: For signal smoothing.
Limit Value Monitoring: For alarm detection.
Configurable Conversion Time: 3 to 1600 ms range.
Multiple Sensor Types: Wide sensor compatibility.
Housing and Mechanical Data
Design Form: HD (High Density) housing with signal LEDs.
Material: Polycarbonate for durability.
Dimensions (W x H x D): 12 mm x 100 mm x 68 mm.
Installation: 35 mm DIN rail conforming to EN 60715 with lock.
Side by Side Mounting: Double slot and key connection.
Marking: Labeling of BZxxx series.
Wiring Specifications
Solid Conductor (s*): 0.08 to 1.5 mm².
Stranded Wire (st*): 0.25 to 1.5 mm².
With Ferrule (f*): 0.14 to 0.75 mm².
AWG Solid: AWG 28 to 16.
AWG Stranded: AWG 22 to 16.
AWG with Ferrule: AWG 26 to 19.
Stripping Length: 8 to 9 mm.
Termination: Spring actuation by screwdriver (fine-stranded).
Solid Conductor Termination: Direct plug-in technique.
Power Contact Specifications
Current Load Power Contacts: Imax: 10 A.
Environmental Specifications
Operating Temperature: -25 to +60°C.
Storage Temperature: -40 to +85°C.
Relative Humidity: 95% without condensation.
Vibration Resistance: Conforms to EN 60068-2-6.
Shock Resistance: Conforms to EN 60068-2-27.
EMC Immunity: Conforms to EN 61000-6-2.
EMC Emission: Conforms to EN 61000-6-4.
Protection Rating: IP20.
Installation Position: Variable.
Approvals and Markings
CE: Conforms to European standards.
UL: Underwriters Laboratories approved.
Installation Guide
Follow these steps to install the Beckhoff EL3208 correctly.
Power Down the System: Turn off all power to the EtherCAT network.
Mount DIN Rail: Ensure 35 mm DIN rail conforms to EN 60715.
Attach Terminal: Clip the EL3208 onto the DIN rail until it locks.
Connect E-bus: Insert the terminal into an existing EtherCAT terminal block.
Side Mounting: Use double slot and key connection for adjacent terminals.
Strip Wires: Remove 8 to 9 mm of insulation from each conductor.
Terminate Wires: Insert solid wires directly or use screwdriver for stranded.
Connect Pt100 Sensors: Wire up to eight 2-wire RTD sensors.
Use Proper Wiring: Ensure 2-wire connection for each sensor channel.
Verify Sensor Type: Configure terminal for Pt100, Pt1000, Ni, or KTY.
Apply Power: Turn on the E-bus supply (no external power needed).
Check LEDs: Observe measurement status via signal LEDs.
Set Conversion Time: Configure from 3 to 1600 ms as needed.
Monitor Temperature: Verify readings with 0.1°C resolution.
Installation Notes
The terminal measures resistance and converts to temperature.
Default conversion time is approximately 170 ms.
Measuring error for Pt sensors is less than ±0.5°C.
Electrical isolation is 500 V between E-bus and signal voltage.
The HD housing fits 8 channels in just 12 mm width.
Packaging List
This unit ships as a new and original product.
Beckhoff EL3208 EtherCAT Terminal (8-channel RTD input)
Product data sheet
Spring actuation tool information
Anti-static factory packaging bag
Frequently Asked Questions (FAQ)
1. What sensor types does the EL3208 support?
The Beckhoff EL3208 supports Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Ni1000, KTY sensors, and resistance measurement. It operates with 2-wire technology.
2. What is the temperature measurement range for Pt sensors?
The EL3208 measures Pt sensors from -200 to +850°C. Ni sensors measure from -60 to +250°C with 0.1°C per digit resolution.
3. What is the conversion time of the EL3208?
The Beckhoff EL3208 has a default conversion time of approximately 170 ms. This is configurable from 3 to 1600 ms for application flexibility.
4. What is the measurement error for Pt100 sensors?
The EL3208 provides measuring error of less than ±0.5°C for Pt sensors. The integrated digital filter improves signal quality.
5. How many channels does the EL3208 provide in one housing?
The Beckhoff EL3208 provides 8 analog input channels in a compact 12 mm HD (High Density) housing. This saves significant panel space.