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Yokogawa CR5-PA*A RTD Input Card

Configured for high-precision temperature acquisition in Yokogawa distributed control systems, the Yokogawa CR5-PA*A (CR5-PA*A RTD Input Card) provides direct electrical execution of Pt100 resistance-to-digital signal conversion.

Hardware Specifications

Parameter Specification
Model CR5-PA*A
Brand Yokogawa
Origin USA
Weight 0.3 to 1.0 kg
Dimensions 120 × 90 × 115 mm
Operating Temp -20 to 70 deg C
Power Consumption Max 12 W
Input Type Pt100 RTD
Channels 16 channels
Accuracy ±0.03 deg C

DCS Connectivity and Signal Conditioning

The CR5-PA*A module facilitates integration with the CENTUM CS3000 platform by providing multi-channel RTD input processing. The architecture incorporates channel-to-channel isolation to suppress common-mode noise and prevent ground potential differences from affecting the measurement accuracy of the Pt100 elements. To further maintain process stability, the module performs cold junction compensation (CJC) for integrated thermocouple referencing when required, though its primary function is optimized for resistive sensor inputs.

Frequently Asked Questions

Q: Can this module be installed or removed while the I/O nest is powered?

A: No, the module does not support hot-swapping. Operators must isolate the 24 VDC power supply and disconnect field wiring from the module terminals before performing physical maintenance or replacement to avoid electrical damage to the backplane.

Q: How does the module handle signal interference on the RTD leads?

A: The module utilizes dedicated input filtering and galvanic isolation to mitigate electromagnetic interference. For optimal performance in high-noise environments, use shielded 3-wire or 4-wire RTD cabling and terminate the shield at the cabinet entry point.

Field Installation Guidelines

  1. Mounting: Secure the module onto a standard DIN rail within the I/O cabinet. Ensure the mounting orientation allows for adequate natural convection, as the unit dissipates up to 12 W under full load.
  2. Grounding: Connect the chassis ground terminal of the module to the cabinet PE bus using a low-impedance copper strap to maintain the integrity of the galvanic isolation barrier.
  3. Wiring: Route RTD signal cables through dedicated conduits, maintaining a physical separation of at least 200 mm from high-voltage AC lines or VFD output cables to minimize inductive crosstalk.
  4. Configuration: Utilize the DCS engineering station to verify the channel scaling and resistance mapping (JIS 1989 standard) before commissioning the loop to ensure correct process variable values are reported.

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