The Yokogawa AAR145-S00 serves as the primary AAR145 TC/RTD Input Module utilized to execute isolated thermocouple and RTD signal acquisition across Yokogawa DCS platforms. The module provides 16 isolated analog input channels with 1 s data refresh handling, RTD excitation current generation, and common burn-out detection configuration.
Suffix Breakdown & Model Matrix
Model
Description
AAR145-S00
Isolated Channels TC/RTD Input Module
Hardware Specifications
Parameter
Specification
Model
AAR145-S00
Brand
Yokogawa
Product Type
TC/RTD Input Module
Number of Input Channels
16 isolated channels
Input Signal Types
Thermocouple, RTD
Allowable Input Voltage
+/-5 V
Measurement Current
RTD: 1 mA
Data Update Period
1 s
Burn-out Detection
Common setting for all channels
Burn-out Detection Time
60 s
Allowable Total Resistance of Signal Source Plus Wiring
150 Ohm or less per wire
Reference Junction Compensation Accuracy
Not applicable
Maximum Current Consumption
350 mA at 5 VDC
External Connection
Dedicated cable KS8/AKB335
Weight
0.3 kg
Power Consumption
1.75 W nominal at maximum current load
Origin
Japan
Channel Isolation and DCS Analog Acquisition Characteristics
The AAR145-S00 implements channel-to-channel isolation for thermocouple and RTD analog acquisition circuits connected through Yokogawa DCS backplane assemblies. Isolated channel construction reduces conductive interference transfer between low-level temperature measurement loops sharing common cabinet infrastructure.
RTD measurement operation uses an internal 1 mA excitation current source for resistance conversion processing. Thermocouple acquisition handling is executed through isolated analog front-end circuitry with centralized burn-out status processing configurable across all channels simultaneously.
Frequently Asked Questions
Q: Does the AAR145-S00 support independent burn-out configuration per channel? A: No. Burn-out handling is configured collectively for all channels according to the provided specification.
Q: What is the maximum allowable field wiring resistance for RTD input loops? A: The allowable total resistance of the signal source plus wiring is 150 Ohm or less per wire.
Q: Is cold junction compensation implemented inside the AAR145-S00 module? A: The specification identifies reference junction compensation accuracy as not applicable for this module variant.
Field Installation Guidelines
Route thermocouple and RTD wiring separately from AC power and motor feeder conductors.
Use shielded instrumentation cable with grounding terminated at one cabinet reference point only.
Verify polarity consistency on thermocouple terminations before energizing the input module.
Avoid excessive terminal torque on dedicated KS8/AKB335 cable interfaces to prevent connector deformation.
Confirm cabinet backplane power loading remains within allowable 5 VDC current supply limits before module insertion.
Maintain separation between redundant analog signal groups and high-frequency switching equipment wiring.
