Product Details
The Yokogawa AAR181-S00 S2, also cataloged as the AAR181 RTD Input Module, operates as a dedicated hardware component for 12-channel isolated temperature measurement acquisition within Yokogawa process control platforms. It processes direct resistance signals from field RTD sensors and converts electrical values for sub-rack bus distribution.
Suffix Breakdown & Model Matrix
| Code / Option | Description |
|---|---|
| Model: AAR181 | RTD Input Module (Isolated 12-channel) |
| -S | Standard type |
| 0 | Basic logic interface configuration |
| 0 | Basic functional execution level |
| S2 | Hardware revision level 2 |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAR181-S00 S2 |
| Brand | Yokogawa |
| Origin | USA |
| Weight | 0.2 kg |
| Dimensions | 3.2 cm x 12.5 cm x 13.0 cm |
| Operating Temp | -20 to +70 deg C |
| Power Consumption | Max 450 mA at 5 VDC (backplane powered) |
| Number of Channels | 12 isolated channels |
| Signal Type | CH1 to CH12 RTD inputs |
| Allowable Input Voltage | +/-5 V |
| Measurement Accuracy | RTD: +/-120 mohm |
| Temperature Drift | RTD: +/-120 mohm / 10 deg C |
| RTD Excitation Current | 1 mA |
| Max Wiring Resistance | 40 ohm or less per wire |
| External Termination | Pressure clamp terminal block |
| Redundancy | Dual-redundant configuration support |
4-20 mA HART Loop Protocol and Channel Isolation
The AAR181-S00 S2 incorporates internal channel-to-channel isolation networks across all 12 input paths to prevent ground loop currents from destabilizing sensor conversion logic. Operating in Yokogawa DCS chassis alongside control modules processing 4-20 mA HART loop protocol signals, the board isolates millivolt-level RTD measurement circuits from high common-mode backplane noise. Continuous galvanic separation ensures consistent signal integrity across adjacent process input channels during fast scan execution cycles.
Frequently Asked Questions
Q: How is field sensor wiring terminated on the AAR181-S00 S2 module?
A: Physical wiring connects via a direct pressure clamp terminal assembly attached to the front interface of the module.
Q: What is the maximum allowable wiring resistance for each RTD lead?
A: The combined signal source and wiring resistance must not exceed 40 ohm per wire to maintain specified measurement accuracy.
Q: Is dual-redundant operation supported by the AAR181-S00 S2?
A: Yes, the module hardware design allows paired installation in dual-redundant sub-rack slots to execute continuous process signal tracking and switch-over.
Field Installation Guidelines
- ESD Protection: Always wear a grounded anti-static wrist strap before handling the circuit board assembly to prevent electrostatic discharge damage.
- Module Insertion: Align board edges with sub-rack chassis guides and push firmly until rear bus connectors fully lock into the backplane.
- Shield Grounding: Terminate RTD extension cable shielding at the designated system earthing bar inside the control cabinet to suppress external interference.
- Wiring Separation: Route low-level RTD input leads in dedicated raceways separated from high-voltage AC power cabling and inductive motor loads.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
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