Thermocouple Input Module | Yokogawa AAT145-S03
Manufacturer: Yokogawa
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Part Number: AAT145-S03
Condition：New with Original Package
Product Type: Analog Input Modules
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Country of Origin: Japan
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Yokogawa AAT145-S03 Style S1 Thermocouple / mV Analog Input Module
The Yokogawa AAT145-S03 Style S1, also cataloged as the AAT145 Thermocouple / mV Analog Input Module, operates as a dedicated hardware component for low-level analog signal acquisition within CENTUM VP, CS 3000, and ProSafe-RS control systems. Operating on an internal 5 VDC backplane supply, this module digitizes millivolt and thermocouple inputs across 16 isolated channels. It features integrated Cold Junction Compensation (CJC) for temperature sensors, channel-to-channel galvanic isolation, and configurable sensor burnout detection delivered through a KS1 interface connection.
Suffix Breakdown & Model Matrix
| Code / Suffix | Designation | Technical Description |
|---|---|---|
| AAT145 | Base Model | Thermocouple / mV Analog Input Module |
| -S03 | Configuration Option | Standard isolated input version for temperature and low-voltage field acquisition |
| STYLE S1 | Revision Level | Hardware revision designation for circuit design and board layout |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAT145-S03 Style S1 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.20 kg to 0.35 kg (0.70 lbs) |
| Dimensions | Standard FIO rack mountable module footprint |
| Operating Temp | -20 to +70 deg C |
| Power Consumption | 350 mA to 500 mA at 5 VDC |
| Input Channel Count | 16 channels (15 usable for TC/mV, 1 dedicated CJC reference channel) |
| Supported Input Types | Thermocouples (R, J, K, E, T, B, S, N); mV signals (-100 to +150 mV) |
| Cold Junction Compensation | Built-in CJC, per channel accuracy support |
| Isolation Rating | 500 VAC channel-to-channel and module-to-ground (1 min) |
| Measurement Accuracy | +/- 40 uV (TC / mV input ranges) |
| Source Resistance / Impedance | Source resistance <= 1000 ohm; Input resistance >= 1 Mohm (Power ON) |
| Update Cycle & Burnout | 1 second update cycle; Configurable upslope/downslope burnout detection (60 s trigger) |
Channel Isolation and Cold Junction Compensation
The Yokogawa AAT145-S03 Style S1 features discrete galvanic isolation rated at 500 VAC between individual input channels and internal system backplane logic. To compensate for ambient thermal variances at field wiring points, the module includes dedicated Cold Junction Compensation (CJC) circuits alongside its primary analog-to-digital processing loops. In process automation architectures using 4-20 mA HART instrumentation and temperature sensors, individual CJC routing eliminates thermal offset errors while blocking common-mode noise propagation generated by ground potential differences between field sensor wells and junction boxes.
Frequently Asked Questions
Q: How does the AAT145-S03 Style S1 handle a broken or disconnected thermocouple wire?
A: The module executes configurable burnout detection (upslope or downslope), forcing the digitized signal value to maximum or minimum scale limits within 60 seconds of detecting an open-circuit loop condition.
Q: What is the maximum permissible source resistance for thermocouple field cabling?
A: Field sensor lead wires and extension cables must maintain a total loop resistance of 1000 ohm or less to ensure measurement drift remains within the specified +/- 40 uV accuracy margin.
Q: Can all 16 channels be used simultaneously for thermocouple inputs?
A: 15 channels are available for primary thermocouple or millivolt field measurements, with 1 channel dedicated to tracking reference junction temperatures via internal CJC sensors.
Field Installation Guidelines
Mount the AAT145-S03 Style S1 module into its designated slot in the FIO node rack, pressing until the backplane connectors latch completely. Secure the external field connection using a compatible Yokogawa KS1 interface cable connected to an M4 screw terminal board. Route low-level millivolt and thermocouple extension cables in dedicated, grounded metal conduits separate from high-voltage AC conductors or variable frequency drive wiring. Earth signal cable shields at a single ground bus point within the control cabinet to prevent ground loop currents from interfering with CJC sensor calibration. Ensure all terminal block screws are torqued properly to maintain a minimum engagement of 5 full threads.