Yokogawa ATR8S-00 S2 Pressure Clamp Terminal Block

Configured for high-density RTD signal acquisition in CENTUM VP systems, the Yokogawa ATR8S-00 S2 (ATR8S-00 Pressure Clamp Terminal Block) provides direct physical and electrical execution of sensor interfacing to AAR181 I/O modules.

Suffix Breakdown & Model Matrix

• ATR8S-00: Standard pressure clamp terminal block configuration.

• S2: Revised hardware revision for enhanced connection stability and mechanical compatibility with modern control cabinet rails.

• Surge Absorber Variants: The model architecture supports versions integrated with or without surge absorbers to mitigate transient voltage impacts from field-side wiring.

Hardware Specifications

Process Control and DCS Instrumentation Characteristics

• 4-20 mA HART loop protocol: While the ATR8S-00 S2 is dedicated to RTD termination, the interface is architecturally compatible with CENTUM VP I/O cards that manage HART data. It ensures that the integrity of the resistance measurement is maintained across the termination barrier.

• Channel-to-channel isolation: The block is designed to provide electrical separation between the 12 RTD input points. This prevents common-mode noise propagation, which is necessary for maintaining the high-accuracy requirement of temperature sensing in distributed control loops.

• Cold junction compensation (CJC): The terminal block assembly interfaces with the AAR181 module to facilitate accurate temperature signal processing. It serves as the physical anchor point for sensor leads, maintaining stable thermal connectivity required for precision measurement.

• FOUNDATION Fieldbus / Profibus PA connectivity: The terminal block structure is engineered to support the signal requirements of high-density I/O arrays, ensuring that sensor resistance signals remain free of reflections or impedance-related jitters during transmission to the control network.

Frequently Asked Questions

Q: Is the terminal block compatible with all RTD types (Pt100, Cu100)?

A: Compatibility is determined by the AAR181 I/O module settings. The ATR8S-00 S2 acts as a passive termination interface; ensure the module configuration matches the specific RTD sensor type being connected.

Q: How is the surge absorber integrated into the terminal block?

A: The surge absorber variant includes internal protective components mapped to each input point. It is installed in-line between the field terminal and the I/O module interface to clamp transient voltage spikes exceeding the threshold.

Field Installation Guidelines

• Mounting: Secure the ATR8S-00 S2 onto the standard control cabinet DIN rail. Verify that all 12 terminal points are accessible and that the assembly is properly spaced to prevent thermal accumulation from adjacent high-power modules.

• Grounding: Terminate the shield drain wire from the RTD cable to the dedicated ground bus within the terminal block assembly. A low-impedance connection is mandatory to ensure the effective diversion of electromagnetic interference to the cabinet earth.

• Wiring: Utilize twisted-pair, shielded cabling for all RTD sensor connections to minimize inductive noise. Avoid parallel routing with AC power cables or VFD motor leads to prevent signal interference with the low-voltage resistance measurement circuits.