PLCs, Power Supplies & Others

Technical Overview

The ER5*B accepts resistance temperature detector signals and converts them into digital values for control systems. This input module supports multiple RTD types for maximum application flexibility in temperature measurement. Process facilities depend on this module for accurate thermal data acquisition in critical operations. The ER5*B offers high-resolution conversion and excellent noise rejection for reliable readings.

Key Specifications

RTD Compatibility and Input Flexibility

The ER5*B supports four common RTD types: Pt100, Pt50, Ni100, and Cu100. This module accepts 2-wire, 3-wire, or 4-wire RTD connections for diverse field installation scenarios. Users can configure each channel independently to match the specific sensor type and wiring configuration. The module covers a wide temperature range from -200°C to +850°C when using Pt100 sensors. Consequently, this input module suits cryogenic and high-temperature measurement applications equally well.

Measurement Accuracy and Resolution

This RTD input module delivers 18-bit A/D conversion for exceptional signal resolution and detail. The ER5*B achieves an accuracy of ±0.05% of full scale across its measurement range. Linearity error remains within ±0.01% of span for consistent performance across the full scale. The module incorporates a lead wire resistance effect of only 0.01°C per ohm when using 3-wire configuration. This compensation ensures accurate readings regardless of sensor cable length variations.

Sampling and Integration Characteristics

The ER5*B provides an update rate of 80 ms per channel for timely process data acquisition. Users can select integration times of 50 ms or 60 ms depending on power line frequency. This selectable integration time effectively rejects AC noise from plant power sources. The module updates all eight channels sequentially without affecting measurement accuracy. Consequently, the ER5*B delivers consistent readings even in electrically noisy industrial environments.

Power and Isolation Features

This RTD input module draws 150 mA from a 24 V DC supply with 20 to 30 V DC tolerance. The ER5*B provides 500 V AC isolation between input channels and system logic circuitry. This electrical separation eliminates ground loop interference and protects the control system. The module’s modest power consumption minimizes heat generation within control cabinets. Lower operating temperatures contribute to improved long-term reliability and service life.

Mechanical Design and Installation

The ER5*B comes in a compact DIN-rail mountable enclosure measuring 130 mm × 50 mm × 100 mm. Its lightweight construction of 0.35 kg simplifies handling and installation within crowded cabinets. The module features removable screw-type terminal blocks for convenient field wiring. Each terminal accepts wire gauges from 0.2 mm² to 2.5 mm² (24 to 14 AWG). Installers appreciate the clear terminal labeling that reduces wiring errors and installation time.

Diagnostic and Monitoring Functions

The ER5*B includes open-circuit detection to identify sensor failures promptly. The module also provides burnout indication through the control system’s diagnostic interface. These diagnostic features help maintenance personnel locate faulty sensors quickly. Furthermore, front-panel LEDs display power and communication status for each channel. Operators can monitor these indicators to verify normal module operation at a glance.

Application Suitability

The ER5*B serves temperature monitoring applications across chemical, pharmaceutical, and food processing industries. This input module excels in applications requiring precise RTD measurements with reliable signal conditioning. Its 3-wire and 4-wire capabilities ensure accurate readings over long cable runs. The module handles temperature sensing in reactors, heat exchangers, and storage vessels. Furthermore, the ER5*B integrates seamlessly with Yokogawa CENTUM VP and CS 3000 systems.

Operational Guidance

Mount the ER5*B securely on a DIN rail within the system cabinet. Connect the RTD sensor leads to the appropriate terminal positions on the removable connector. Configure each channel’s RTD type and wiring configuration using the system software. Verify sensor readings through the operator workstation before commissioning the control loop. The module requires no periodic calibration, which reduces maintenance workloads. Monitor diagnostic indicators to detect sensor faults promptly.

Details