Triconex 3721 Analog Input Module New Surplus
Industrial automation does not wait for lead times. The Triconex 3721 is a input module that we keep on the shelf in Shenzhen — real inventory, ready to ship. No. of Input Points: 32 differential, DC-coupled | Isolated Points: Yes | Input Update Rate: 10 ms. Every unit functionally verified before packing. 12-month warranty.
Technical Specifications
| Voltage | 0 to 5 VDC or -5 to +5 VDC, + 6% |
|---|---|
| Type | TMR, AI |
| No. of Input Points | 32 differential, DC-coupled |
| Isolated Points | Yes |
| Input Update Rate | 10 ms |
| Resolution | 12 bits or 14 bits (programmable) |
| Accuracy | < 0.15% of FSR from 0° to 60°C |
| Input Resistance (load) | 10 MΩ (DC), min. |
| Power-Off Resistance | 140 kΩ (DC), typical |
| Common Mode Rejection | -85 dB (DC - 100 Hz) |
| Common Mode Range | -12V to +12V peak |
| Leg-to-Leg Isolation | 420 kΩ, typical |
| Input Overrange Protection | 150 VDC/115 VAC continuous |
| Current Range | 0-20 mA with 250 Ω shunt resistor |
| Diagnostic Indicators | Module Status (PASS, FAULT, ACTIVE, FIELD) |
| Color Code | Yellow |
| Manufacturer | Triconex |
| Model / SKU | 3721 |
Ships within 24 hours | 12-Month Warranty | Worldwide Delivery
Why the Triconex 3721 Matters for Your Operation
In power generation, every component in your control system has a specific job — and when one fails, the ripple effects can shut down an entire production line. The Triconex 3721 is a input module that keeps your gas turbine control systems and steam turbine monitoring running without interruption.
Here is what this module actually does. voltage: 0 to 5 VDC or -5 to +5 VDC, + 6%; type: TMR, AI; no. of input points: 32 differential, DC-coupled; isolated points: Yes. These are not generic specifications — they determine whether this module will work in your specific Triconex system. We have seen too many cases where a maintenance team ordered a replacement only to find it was the wrong revision or configuration. That is why we test every 3721 on a live Triconex rack before shipping — full signal injection across every channel, not just a visual check.
Installation matters too. The most common cause of DOA reports is not a defective module — it is bent backplane pins from forcing a module in at the wrong angle. Take your time lining up the guides. Apply even pressure. If it does not slide in smoothly, stop and check the alignment. Always wear a grounded wrist strap — static discharge from removing a fleece jacket in a dry turbine hall can exceed 15,000 volts, destroying sensitive input protection diodes instantly.
Think about your sparing strategy. A single Triconex 3721 costs a fraction of what one hour of unplanned downtime costs in power generation. We ship replacements within 24 hours from Shenzhen — but even 24 hours is too long if you are losing production. For critical applications, keep one cold spare on your shelf.
Compatible Parts — Same System
These modules share the same system family as the 3721. Commonly ordered together for complete rack builds or spare parts kits.
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