Yokogawa ATR8D-00 Pressure Clamp Terminal Block

Configured for high-density RTD signal acquisition in CENTUM VP systems, the Yokogawa ATR8D-00 (ATR8D-00 Pressure Clamp Terminal Block) provides direct physical and electrical execution of 12-channel isolated sensor interfacing to AAR181 I/O modules.

Hardware Specifications

Process Control and DCS Instrumentation Characteristics

• 4-20 mA HART loop protocol: The terminal block maintains signal impedance parameters required for HART-enabled instrumentation loops. This ensures that RTD-based temperature variables are transmitted with high fidelity to the associated I/O modules.

• Channel-to-channel isolation: The design features 12 electrically isolated channels, preventing common-mode noise and ground loops between sensors. This isolation is necessary for maintaining signal accuracy when monitoring multi-point temperature profiles across different physical locations.

• Cold junction compensation (CJC): The assembly serves as a stable mechanical and thermal interface for thermocouple and RTD signal leads. Its design facilitates consistent CJC performance by the host module, ensuring measurement stability despite ambient temperature fluctuations in the control cabinet.

• FOUNDATION Fieldbus / Profibus PA connectivity: The terminal block’s layout is optimized for high-density cabling, ensuring that RTD signal integrity is preserved for transmission to control systems interfacing with industrial fieldbus networks.

Frequently Asked Questions

Q: Is the surge absorber optional feature field-installable?

A: No, the surge absorber is an integrated component configured at the time of manufacture to ensure EMC compliance per EN 61000-6-2. Retrofitting this protection onto a non-surge-equipped terminal block is not supported.

Q: How does the dual-redundant design interact with the AAR181 module?

A: The dual-redundant architecture provides physical path separation for redundant sensor inputs, allowing the AAR181 module to facilitate fail-over logic between two independent sensor leads for the same process point, ensuring continuous measurement availability.

Field Installation Guidelines

• Mounting: Secure the ATR8D-00 onto the standard control cabinet DIN rail. Verify that the pressure clamp mechanism for all 12 channels is fully accessible and that the assembly is spaced to allow for proper airflow and heat dissipation.

• Grounding: Terminate the shield drain wires from the RTD cables to the integrated ground lug on the terminal block. A low-impedance ground connection is mandatory to ensure the efficacy of the surge absorber and to drain electromagnetic interference away from the isolated channels.

• Wiring: Maintain strict physical separation between the RTD signal wiring and high-voltage power conduits. Use shielded, twisted-pair cabling for all inputs to minimize inductive coupling and maintain measurement accuracy across the full range of the 12 isolated channels.