Triconex PI3381 - 8-Channel Isolated Analog Input Module for TriStation Safety Controller

Triconex PI3381 – 8-Channel Isolated Analog Input Module for TriStation Safety Controller

In stock

Product Introduction:
The Triconex PI3381 is an 8-channel analog input module for the Triconex TriStation safety controller. The “PI” stands for Process Input (analog input), “3381” identifies the 8-channel isolated configuration. This module accepts 4-20mA signals from field transmitters measuring critical process variables like pressure, temperature, flow, and level. The module provides 1500V RMS galvanic isolation between each channel and the safety processor, protecting the controller from voltage transients and ground loops. It is used in safety-critical loops where the analog process variable directly determines whether a safety action (like a shutdown) is required.

Technical Specifications:
Board Type: Analog Input Module
Channels: 8 independent analog input channels
Input Signal: 4-20mA, 2-wire or 4-wire
Resolution: 16-bit A/D conversion
Accuracy: +/- 0.1% of full scale
Isolation: 1500V RMS channel-to-channel and channel-to-ground
Update Rate: 250 milliseconds per channel
Burst Mode Support: Compatible with HART burst mode for secondary variable reading
Voting: 2-out-of-3 hardware voting with redundant modules
LED Indicators: Per-channel green LEDs show input status
Power: 24V DC from I/O carrier
Form Factor: 3U Triconex Eurocard

Functional Features:
High Isolation: 1500V RMS isolation protects the safety processor from electrical transients in the field.
Per-Channel Configuration: Each channel independently configurable for input range, filtering, and fault response.
Fail-Safe Output: On communication loss or burnout, the module drives the safety processor input to a predetermined safe value.
Self-Diagnostics: Continuous self-test of A/D converters, isolation barriers, and communication paths.
LED Status: Bright per-channel LEDs allow instant visual verification of input status.
Watchdog Timer: Hardware watchdog detects communication loss and forces safe output.

Application Scenarios:
Pressure Safety Monitoring: Reads 4-20mA pressure transmitters for high-pressure trip logic in refineries and chemical plants.
Temperature Safety Monitoring: Reads RTD or thermocouple transmitters (via external transmitters) for overtemperature trip logic.
Flow Safety Monitoring: Reads flow transmitters for low-flow or high-flow safety interlocks.
Level Safety Monitoring: Reads level transmitters for high-level or low-level safety trips in tanks and vessels.

Show More Show Less