Description
Yokogawa AAT145-S03 Thermocouple/mV Input Module
The Yokogawa AAT145-S03, also cataloged as the AAT145-S03 input module, operates as a dedicated hardware component for thermocouple and millivolt signal acquisition within Yokogawa distributed control system (DCS) I/O architectures.
SuffixBreakdown&ModelMatrix
AAT145: 16-channel analog input thermocouple/mV module
S03: Hardware revision / configuration variant identifier (no further factory-disclosed segmentation provided in source data)
HardwareSpecifications
| Parameter |
Specification |
| ModelBrand |
Yokogawa AAT145-S03 |
| Origin |
Japan (Yokogawa manufacturing group) |
| Weight |
Approx. 0.35 kg |
| Dimensions |
Not specified |
| OperatingTemp |
-20 to 70 degC |
| PowerConsumption |
~500 mA at 5 VDC internal |
| Input Channels |
16 isolated channels (15-channel mode with MTC/TETC) |
| Input Types |
JIS thermocouples (R, J, K, E, T, B, S, N), -100 to 150 mV |
| Isolation |
500 VAC channel-to-channel and module-to-ground (1 min) |
| CJC |
Built-in cold junction compensation |
Yokogawa Channel Isolation and CJC Processing Architecture
The Yokogawa AAT145-S03 implements channel-to-channel galvanic separation at 500 VAC withstand level, reducing cross-channel electrical coupling during thermoelectric signal acquisition. Each thermocouple input is processed with integrated cold junction compensation (CJC), enabling direct conversion of junction voltage into compensated temperature data without external reference modules. The architecture aligns with Yokogawa DCS I/O design rules where analog front-end isolation is maintained per channel group to stabilize measurement integrity under mixed signal load conditions.
FrequentlyAskedQuestions
Q: Can the AAT145-S03 operate in mixed thermocouple and mV input configuration simultaneously?
A: Yes. Each channel supports independent configuration for JIS thermocouple types or -100 to 150 mV input signals.
Q: What is the isolation behavior between channels?
A: The module provides 500 VAC isolation between channels and between module and ground for 1 minute withstand rating.
Q: Is external cold junction compensation required?
A: No. Cold junction compensation is internally implemented per channel.
FieldInstallationGuidelines
Ensure KS1 cable shielding is grounded at the designated system-side earth point only to prevent ground loop formation across thermocouple loops. Maintain separation between thermocouple wiring and power conductors to reduce induced voltage error on low-level mV inputs. For terminal board integration (MTC or TETC), verify connector seating alignment before applying backplane power. Cable conductor cross-section must remain within 0.5 to 2 mm2 without sleeve or 0.5 to 1.5 mm2 with DIN 46228 ferrules.
