Yokogawa AAR181-S50 CENTUM VP RTD Input Module
Manufacturer: Yokogawa
-
Part Number: AAR181-S50 RTD
Condition：New with Original Package
Product Type: RTD Input Modules
-
Country of Origin: Japan
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Yokogawa AAR181-S50 RTD Input Module
The Yokogawa AAR181-S50, also cataloged as the AAR181 RTD Input Module, operates as a dedicated hardware component for isolated temperature signal acquisition within Yokogawa CENTUM CS 3000 / VP DCS field control stations. It accepts inputs directly from resistance temperature detectors (RTD), thermocouples, and millivolt sources across 12 channels.
Suffix Breakdown & Model Matrix
| Suffix Code | Description | Technical Details |
|---|---|---|
| AAR181 | Base Model | RTD / TC / mV Input Module |
| -S | Type | Standard Type |
| 5 | Explosion Protection | With No Explosion Protection |
| 0 | Basic Type | Basic Processing Architecture |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAR181-S50 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.2 to 0.3 kg (Shipping Weight: 3 kg) |
| Dimensions | Standard CENTUM I/O Module Dimensions |
| Operating Temp | 0 to 55 deg C |
| Power Consumption | 450 mA (5 VDC) |
| Number of Channels | 12 isolated channels |
| Input Signal Types | RTD (Pt100, JPt100), Thermocouple (Types J, K, E, B, R, S, T, N), Millivolt (-100 to 150 mV, -20 to 80 mV) |
| Measurement Accuracy | +/-0.1% of span |
| Withstanding Voltage | 1500 VAC (input to system, 1 minute) |
| Input Resistance | 2 M ohm or larger |
| Temperature Drift | +/-0.05% per 10 deg C |
| Data Update Period | 1 second |
| External Connections | Direct pressure clamp terminal block, KS cable adapter block, or MIL connector cable |
Channel Isolation and Cold Junction Compensation
The AAR181-S50 incorporates 1500 VAC channel-to-system galvanic isolation to suppress common-mode electrical noise and eliminate ground potential differences between field sensor wiring and system logic circuitry. Integrated signal conditioning includes reference junction compensation for thermocouple types and 3-wire/4-wire RTD excitation balance processing. Active burnout detection monitors sensor loop integrity, driving channel data to upscale or downscale alarm limits within 60 seconds of open-circuit signal loss. Dual-redundant module execution is fully supported when installed in paired I/O nest configurations.
Frequently Asked Questions
Q: How does the module execute sensor burnout detection upon element wire failure?
A: The onboard circuitry monitors sensor loop resistance continuously. When an open circuit occurs, the module forces the digital signal value to either UP (high limit) or DOWN (low limit) based on the channel software configuration within a 60-second detection interval.
Q: What interface cable options are supported for signal termination?
A: Field signals connect directly via pressure clamp terminal blocks, an interface adapter connected via a dedicated KS cable, or a customer-furnished MIL connector cable routed to external terminal bases.
Q: Can the module be installed in a dual-redundant configuration?
A: Yes, two AAR181-S50 modules operate in parallel across paired I/O backplane slots, enabling seamless hardware failover without interrupting signal acquisition to the field control station.
Field Installation Guidelines
- Shielding and Grounding Rules: Terminate individual signal cable shields at the module grounding bar or pressure clamp earth terminal. Ensure shields are grounded at one point only to prevent ground loops from introducing noise into low-mV RTD voltage measurements.
- Cable Separation: Route low-level RTD and thermocouple lines in separate metal conduits or cable trays, keeping a minimum distance of 300 mm from 24 VDC control lines and 120/230 VAC power wiring.
- Terminal Wiring Protocol: Torque pressure clamp terminal screws strictly to manufacturer specifications. Ensure KS cables or MIL connector latches engage completely to maintain continuous contact under cabinet vibration.