Invensys Triconex 3721
| Brand | Triconex Invensys |
| Module Number | Triconex 3721 |
| Unit Price | $6300 |
| Country Of Origin | USA |
| Weight | 2.5 KG |
| Certificate |
C/O from the Chamber of Commerce C/Q from the Manufacturer |
| Warranty | 12 Months |
| Inventory Qty | 10 |
The Invensys Triconex 3721 is a TMR (triple-modular redundant) Analog Input Module designed for safety-critical systems. It handles up to 32 differential voltage inputs (±5 V), converts signals to digital, and uses majority voting for fault-tolerant readings.
Invensys 3721 Main Power Input: 24 V DC nominal
Input Channels: 32 differential analog (0–5 V or ±5 V)
Resolution: Programmable 12-bit or 14-bit
Update Rate: 10 ms for all channels
Accuracy: < 0.15% full scale (0–60 °C)
Isolation: 1,500 V DC channel-to-channel
Overrange Protection: Up to 150 V DC / 115 V AC continuous
Beneficiary's Bank: CITIBANK N.A.
Beneficiary address:Champion Tower,Three Garden Road,Central,Hong Kong
Beneficiary: Vogi International Trading Co., Limited
Account No.: 395714900
Bank Code: 006 Branch Code: 391
Swift Code:CITIHKHX (CITIHKHXXXX * If 11 characters are required)
Payment Term：T/T
Triconex 3721 Key features
Triple Modular Redundancy guarantees high safety and fault tolerance
Programmable resolution adapts to different precision requirements
Fast update rate supports real-time process control
High isolation prevents crosstalk and enhances signal integrity
Robust design certified for harsh industrial environments
Performance comparison
|
Parameter |
3700A | 3721 | 3723E |
| Input Range | 0-5 V differential | 0-5 V or ±5 V differential | Thermocouple / RTD |
| Channels | 32 | 32 | 8 |
| Resolution | 12-bit | 12/14-bit programmable | 16-bit |
| Application Focus | General analog sensing | High-precision analog | Temperature sensing |
Summary:
3721 offers balanced channel count and precision. Model 3700A provides similar accuracy with more voltage ranges, while 3723E supports thermocouples and RTDs for versatile sensing.
Typical cooperation cases
North America - Refinery Emergency Shutdown
Used in fire-and-gas loops to capture critical analog values for shutdown logic; diagnostics supported quick fault resolution.
Europe - Chemical Reactor Control
Deployed in reactor temperature monitoring for precise control and safety interlocks; update rate ensured timely fault detection.
Asia - Power Plant Turbine Feedback
Implemented for turbine vibration and pressure sensor input to safety systems; redundancy supported continuous operation.
Australia - Offshore Oil Platform
Installed for flowmeter and valve position analog feedback in corrosive environments; robust design ensured long-term reliability
