AD203MH Foxboro I/A Series High-Input Analog Module
Manufacturer: Foxboro
-
Part Number: AD203MH
Condition：New with Original Package
Product Type: Analog Input Modules
-
Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Foxboro AD203MH I/A Series High-Input Analog Module
The Foxboro AD203MH, also cataloged as the AD203MH High-Input Analog Module, operates as a dedicated hardware component for high-density analog signal conditioning and data acquisition within Foxboro I/A Series platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AD203MH |
| Brand | Foxboro |
| Origin | USA |
| Weight | 0.27 kg |
| Dimensions | Standard Foxboro I/A Series Form Factor |
| Operating Temp | 0 to +60 deg C |
| Power Consumption | Max 8.5 W per non-fault-tolerant module |
| Channel Count | Up to 32 analog inputs |
| Supported Signal Types | Voltage (-32 V to +32 V), Current (-20 mA to +20 mA), RTDs, Thermocouples, Potentiometers |
| Conversion Resolution | 16-bit |
| Measurement Accuracy | +/-0.1% of full scale |
| Supply Input | 24 VDC (supports redundant supply) |
| Onboard Memory | 16 MB SDRAM, 32 MB Flash |
| Redundancy Support | Fault-tolerant configuration requires dual modules |
| Storage Temp | -40 to +85 deg C |
| Humidity Range | 5% to 95% RH non-condensing |
Cold Junction Compensation and Channel-to-Channel Isolation
The Foxboro AD203MH executes 16-bit analog signal conversion across 32 configurable input channels, accepting direct field wiring for voltage, current loop, RTD, thermocouple, and potentiometer signals. Integrated cold junction compensation (CJC) circuits maintain thermal measurement stability when processing low-millivolt thermocouple inputs. Robust channel-to-channel isolation prevents ground loop interference across mixed field loop configurations, maintaining 4-20 mA HART loop protocol signal purity while transferring digitized process values to the DCS backplane.
Frequently Asked Questions
Q: How is fault tolerance achieved with the AD203MH module?
A: Fault tolerance requires installing a dual-module pairing in a redundant baseplate structure, allowing automatic failover execution without interrupting signal sampling.
Q: Does the module require external signal conditioning for potentiometer inputs?
A: No. Onboard excitation and scaling circuitry process potentiometer signals directly through the 16-bit analog converter channels.
Q: How does the unit protect against power supply interruptions?
A: Dual 24 VDC power feed terminals utilize internal diode logic to draw operating current continuously from either active bus bar.
Field Installation Guidelines
- Main Power Removal: Isolate all 24 VDC power sources supplying the chassis before inserting or removing the module.
- Ground Wire Attachment: Connect a heavy-gauge copper bonding conductor directly from the module chassis grounding terminal to the central cabinet earth bus bar.
- Signal Cable Shielding: Terminate overall and individual pair cable shields at the designated cabinet grounding rail to minimize high-frequency electromagnetic noise.
- Wire Separation Rules: Route sensitive analog signal cables in separate conduit or wire channels away from AC power lines and inductive motor loads.
- Baseplate Engagement: Slide the module along the enclosure guide rails until the backplane connector locks firmly into the mating socket.